git.delta.rocks / unique-network / refs/commits / a05576acee2a

--- a/.github/workflows/node_build_test.yml
+++ b/.github/workflows/node_build_test.yml
@@ -31,11 +31,11 @@
           username: ${{ secrets.SERVER_USERNAME }}
           key: ${{ secrets.KEY }}
           port: ${{ secrets.SERVER_PORT }}
-          command_timeout: 240m
+          command_timeout: 300m
           script: |
             eval $(ssh-agent -s)
-            ssh-add /home/polkadot/.ssh/git_hub
-            git clone git@github.com:usetech-llc/nft_private.git
+            ssh-add /home/devops/.ssh/git_hub
+            git clone git@github.com:UniqueNetwork/nft_private.git
             cd nft_private
             git checkout develop
             # git pull --all

--- a/Cargo.lock
+++ b/Cargo.lock
@@ -704,6 +704,117 @@
 ]
 
 [[package]]
+name = "bp-header-chain"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "finality-grandpa",
+ "frame-support",
+ "parity-scale-codec",
+ "serde",
+ "sp-core",
+ "sp-finality-grandpa",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
+name = "bp-messages"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bitvec 0.20.4",
+ "bp-runtime",
+ "frame-support",
+ "frame-system",
+ "impl-trait-for-tuples",
+ "parity-scale-codec",
+ "serde",
+ "sp-std",
+]
+
+[[package]]
+name = "bp-polkadot-core"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bp-messages",
+ "bp-runtime",
+ "frame-support",
+ "frame-system",
+ "parity-scale-codec",
+ "sp-api",
+ "sp-core",
+ "sp-runtime",
+ "sp-std",
+ "sp-version",
+]
+
+[[package]]
+name = "bp-rococo"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bp-messages",
+ "bp-polkadot-core",
+ "bp-runtime",
+ "frame-support",
+ "parity-scale-codec",
+ "smallvec 1.6.1",
+ "sp-api",
+ "sp-runtime",
+ "sp-std",
+ "sp-version",
+]
+
+[[package]]
+name = "bp-runtime"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "frame-support",
+ "hash-db",
+ "num-traits",
+ "parity-scale-codec",
+ "sp-core",
+ "sp-io",
+ "sp-runtime",
+ "sp-state-machine",
+ "sp-std",
+ "sp-trie",
+]
+
+[[package]]
+name = "bp-test-utils"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bp-header-chain",
+ "ed25519-dalek",
+ "finality-grandpa",
+ "parity-scale-codec",
+ "sp-application-crypto",
+ "sp-finality-grandpa",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
+name = "bp-wococo"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bp-messages",
+ "bp-polkadot-core",
+ "bp-rococo",
+ "bp-runtime",
+ "parity-scale-codec",
+ "sp-api",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
 name = "bs58"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -3779,6 +3890,91 @@
 ]
 
 [[package]]
+name = "kusama-runtime"
+version = "0.9.8"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "beefy-primitives",
+ "bitvec 0.20.4",
+ "frame-benchmarking",
+ "frame-election-provider-support",
+ "frame-executive",
+ "frame-support",
+ "frame-system",
+ "frame-system-benchmarking",
+ "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
+ "hex-literal",
+ "log",
+ "max-encoded-len",
+ "pallet-authority-discovery",
+ "pallet-authorship",
+ "pallet-babe",
+ "pallet-balances",
+ "pallet-bounties",
+ "pallet-collective",
+ "pallet-democracy",
+ "pallet-election-provider-multi-phase",
+ "pallet-elections-phragmen",
+ "pallet-gilt",
+ "pallet-grandpa",
+ "pallet-identity",
+ "pallet-im-online",
+ "pallet-indices",
+ "pallet-membership",
+ "pallet-mmr-primitives",
+ "pallet-multisig",
+ "pallet-nicks",
+ "pallet-offences",
+ "pallet-offences-benchmarking",
+ "pallet-proxy",
+ "pallet-recovery",
+ "pallet-scheduler 3.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
+ "pallet-session",
+ "pallet-session-benchmarking",
+ "pallet-society",
+ "pallet-staking",
+ "pallet-staking-reward-fn",
+ "pallet-timestamp",
+ "pallet-tips",
+ "pallet-transaction-payment",
+ "pallet-transaction-payment-rpc-runtime-api",
+ "pallet-treasury",
+ "pallet-utility",
+ "pallet-vesting",
+ "pallet-xcm",
+ "parity-scale-codec",
+ "polkadot-primitives",
+ "polkadot-runtime-common",
+ "polkadot-runtime-parachains",
+ "rustc-hex",
+ "serde",
+ "serde_derive",
+ "smallvec 1.6.1",
+ "sp-api",
+ "sp-arithmetic",
+ "sp-authority-discovery",
+ "sp-block-builder",
+ "sp-consensus-babe",
+ "sp-core",
+ "sp-inherents",
+ "sp-io",
+ "sp-npos-elections",
+ "sp-offchain",
+ "sp-runtime",
+ "sp-session",
+ "sp-staking",
+ "sp-std",
+ "sp-transaction-pool",
+ "sp-version",
+ "static_assertions",
+ "substrate-wasm-builder 4.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
+ "xcm",
+ "xcm-builder",
+ "xcm-executor",
+]
+
+[[package]]
 name = "kv-log-macro"
 version = "1.0.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -4935,12 +5131,15 @@
 name = "nft-data-structs"
 version = "0.9.0"
 dependencies = [
+ "derivative",
  "frame-support",
  "frame-system",
+ "max-encoded-len",
  "parity-scale-codec",
  "serde",
  "sp-core",
  "sp-runtime",
+ "sp-std",
 ]
 
 [[package]]
@@ -4999,6 +5198,7 @@
  "cumulus-primitives-core",
  "cumulus-primitives-timestamp",
  "cumulus-primitives-utility",
+ "derivative",
  "fp-rpc",
  "frame-benchmarking",
  "frame-executive",
@@ -5007,6 +5207,7 @@
  "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
  "hex-literal",
+ "max-encoded-len",
  "nft-data-structs",
  "pallet-aura",
  "pallet-balances",
@@ -5014,6 +5215,7 @@
  "pallet-evm",
  "pallet-evm-coder-substrate",
  "pallet-evm-contract-helpers",
+ "pallet-evm-migration",
  "pallet-evm-transaction-payment",
  "pallet-inflation",
  "pallet-nft",
@@ -5316,6 +5518,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "pallet-treasury",
@@ -5325,10 +5528,32 @@
 ]
 
 [[package]]
+name = "pallet-bridge-grandpa"
+version = "0.1.0"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "bp-header-chain",
+ "bp-runtime",
+ "bp-test-utils",
+ "finality-grandpa",
+ "frame-support",
+ "frame-system",
+ "log",
+ "num-traits",
+ "parity-scale-codec",
+ "serde",
+ "sp-finality-grandpa",
+ "sp-runtime",
+ "sp-std",
+ "sp-trie",
+]
+
+[[package]]
 name = "pallet-collective"
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "log",
@@ -5418,11 +5643,13 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-election-provider-support",
  "frame-support",
  "frame-system",
  "log",
  "parity-scale-codec",
+ "rand 0.7.3",
  "sp-arithmetic",
  "sp-core",
  "sp-io",
@@ -5437,6 +5664,7 @@
 version = "4.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "log",
@@ -5537,6 +5765,22 @@
 ]
 
 [[package]]
+name = "pallet-evm-migration"
+version = "0.1.0"
+dependencies = [
+ "fp-evm",
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "pallet-evm",
+ "parity-scale-codec",
+ "sp-core",
+ "sp-io",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
 name = "pallet-evm-transaction-payment"
 version = "0.1.0"
 dependencies = [
@@ -5554,6 +5798,20 @@
 ]
 
 [[package]]
+name = "pallet-gilt"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "parity-scale-codec",
+ "sp-arithmetic",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
 name = "pallet-grandpa"
 version = "3.1.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
@@ -5595,6 +5853,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "log",
@@ -5613,6 +5872,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "parity-scale-codec",
@@ -5712,6 +5972,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "parity-scale-codec",
@@ -5817,10 +6078,33 @@
 ]
 
 [[package]]
+name = "pallet-offences-benchmarking"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "frame-benchmarking",
+ "frame-election-provider-support",
+ "frame-support",
+ "frame-system",
+ "pallet-babe",
+ "pallet-balances",
+ "pallet-grandpa",
+ "pallet-im-online",
+ "pallet-offences",
+ "pallet-session",
+ "pallet-staking",
+ "parity-scale-codec",
+ "sp-runtime",
+ "sp-staking",
+ "sp-std",
+]
+
+[[package]]
 name = "pallet-proxy"
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "max-encoded-len",
@@ -5845,36 +6129,50 @@
 ]
 
 [[package]]
+name = "pallet-recovery"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "enumflags2",
+ "frame-support",
+ "frame-system",
+ "parity-scale-codec",
+ "sp-io",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
 name = "pallet-scheduler"
 version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
  "frame-benchmarking",
  "frame-support",
  "frame-system",
  "log",
  "parity-scale-codec",
- "serde",
- "sp-core",
  "sp-io",
  "sp-runtime",
  "sp-std",
- "substrate-test-utils",
- "up-sponsorship",
 ]
 
 [[package]]
 name = "pallet-scheduler"
 version = "3.0.0"
-source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
  "frame-benchmarking",
  "frame-support",
  "frame-system",
  "log",
  "parity-scale-codec",
+ "serde",
+ "sp-core",
  "sp-io",
  "sp-runtime",
  "sp-std",
+ "substrate-test-utils",
+ "up-sponsorship",
 ]
 
 [[package]]
@@ -5898,10 +6196,40 @@
 ]
 
 [[package]]
+name = "pallet-session-benchmarking"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "frame-benchmarking",
+ "frame-support",
+ "frame-system",
+ "pallet-session",
+ "pallet-staking",
+ "rand 0.7.3",
+ "sp-runtime",
+ "sp-session",
+ "sp-std",
+]
+
+[[package]]
+name = "pallet-society"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "frame-support",
+ "frame-system",
+ "parity-scale-codec",
+ "rand_chacha 0.2.2",
+ "sp-runtime",
+ "sp-std",
+]
+
+[[package]]
 name = "pallet-staking"
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-election-provider-support",
  "frame-support",
  "frame-system",
@@ -5910,6 +6238,7 @@
  "pallet-session",
  "parity-scale-codec",
  "paste",
+ "rand_chacha 0.2.2",
  "serde",
  "sp-application-crypto",
  "sp-io",
@@ -5931,6 +6260,15 @@
 ]
 
 [[package]]
+name = "pallet-staking-reward-fn"
+version = "3.0.0"
+source = "git+https://github.com/paritytech/substrate?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+dependencies = [
+ "log",
+ "sp-arithmetic",
+]
+
+[[package]]
 name = "pallet-sudo"
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
@@ -5966,6 +6304,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "pallet-treasury",
@@ -6024,6 +6363,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "impl-trait-for-tuples",
@@ -6039,6 +6379,7 @@
 version = "3.0.0"
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "parity-scale-codec",
@@ -6054,6 +6395,7 @@
 source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
  "enumflags2",
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "parity-scale-codec",
@@ -6069,6 +6411,7 @@
  "frame-support",
  "frame-system",
  "parity-scale-codec",
+ "serde",
  "sp-runtime",
  "sp-std",
  "xcm",
@@ -7144,12 +7487,15 @@
 dependencies = [
  "beefy-primitives",
  "bitvec 0.20.4",
+ "frame-benchmarking",
  "frame-election-provider-support",
  "frame-executive",
  "frame-support",
  "frame-system",
+ "frame-system-benchmarking",
  "frame-system-rpc-runtime-api",
  "frame-try-runtime",
+ "hex-literal",
  "log",
  "max-encoded-len",
  "pallet-authority-discovery",
@@ -7170,9 +7516,11 @@
  "pallet-multisig",
  "pallet-nicks",
  "pallet-offences",
+ "pallet-offences-benchmarking",
  "pallet-proxy",
  "pallet-scheduler 3.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
  "pallet-session",
+ "pallet-session-benchmarking",
  "pallet-staking",
  "pallet-staking-reward-curve",
  "pallet-timestamp",
@@ -7215,12 +7563,14 @@
 dependencies = [
  "beefy-primitives",
  "bitvec 0.20.4",
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
  "impl-trait-for-tuples",
  "libsecp256k1 0.3.5",
  "log",
  "pallet-authorship",
+ "pallet-babe",
  "pallet-balances",
  "pallet-beefy",
  "pallet-election-provider-multi-phase",
@@ -7258,8 +7608,10 @@
 dependencies = [
  "bitvec 0.20.4",
  "derive_more",
+ "frame-benchmarking",
  "frame-support",
  "frame-system",
+ "libsecp256k1 0.3.5",
  "log",
  "pallet-authority-discovery",
  "pallet-authorship",
@@ -7299,6 +7651,7 @@
  "frame-system-rpc-runtime-api",
  "futures 0.3.16",
  "hex-literal",
+ "kusama-runtime",
  "kvdb",
  "kvdb-rocksdb",
  "pallet-babe",
@@ -7334,6 +7687,7 @@
  "polkadot-runtime",
  "polkadot-runtime-parachains",
  "polkadot-statement-distribution",
+ "rococo-runtime",
  "sc-authority-discovery",
  "sc-basic-authorship",
  "sc-block-builder",
@@ -7375,6 +7729,7 @@
  "substrate-prometheus-endpoint",
  "thiserror",
  "tracing",
+ "westend-runtime",
 ]
 
 [[package]]
@@ -8139,6 +8494,73 @@
 ]
 
 [[package]]
+name = "rococo-runtime"
+version = "0.9.8"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "beefy-primitives",
+ "bp-rococo",
+ "bp-wococo",
+ "frame-executive",
+ "frame-support",
+ "frame-system",
+ "frame-system-rpc-runtime-api",
+ "hex-literal",
+ "log",
+ "max-encoded-len",
+ "pallet-authority-discovery",
+ "pallet-authorship",
+ "pallet-babe",
+ "pallet-balances",
+ "pallet-beefy",
+ "pallet-bridge-grandpa",
+ "pallet-collective",
+ "pallet-grandpa",
+ "pallet-im-online",
+ "pallet-indices",
+ "pallet-membership",
+ "pallet-mmr",
+ "pallet-mmr-primitives",
+ "pallet-offences",
+ "pallet-proxy",
+ "pallet-session",
+ "pallet-staking",
+ "pallet-staking-reward-curve",
+ "pallet-sudo",
+ "pallet-timestamp",
+ "pallet-transaction-payment",
+ "pallet-transaction-payment-rpc-runtime-api",
+ "pallet-utility",
+ "pallet-xcm",
+ "parity-scale-codec",
+ "polkadot-parachain",
+ "polkadot-primitives",
+ "polkadot-runtime-common",
+ "polkadot-runtime-parachains",
+ "serde",
+ "serde_derive",
+ "smallvec 1.6.1",
+ "sp-api",
+ "sp-authority-discovery",
+ "sp-block-builder",
+ "sp-consensus-babe",
+ "sp-core",
+ "sp-inherents",
+ "sp-io",
+ "sp-offchain",
+ "sp-runtime",
+ "sp-session",
+ "sp-staking",
+ "sp-std",
+ "sp-transaction-pool",
+ "sp-version",
+ "substrate-wasm-builder 4.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
+ "xcm",
+ "xcm-builder",
+ "xcm-executor",
+]
+
+[[package]]
 name = "rpassword"
 version = "5.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -10690,13 +11112,13 @@
 [[package]]
 name = "substrate-wasm-builder"
 version = "4.0.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93a3d51ad6abbc408b03ea962062bfcc959b438a318d7d4bedd181e1effd0610"
+source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
 dependencies = [
  "ansi_term 0.12.1",
  "atty",
  "build-helper",
- "cargo_metadata 0.12.3",
+ "cargo_metadata 0.13.1",
+ "sp-maybe-compressed-blob",
  "tempfile",
  "toml",
  "walkdir",
@@ -10706,13 +11128,13 @@
 [[package]]
 name = "substrate-wasm-builder"
 version = "4.0.0"
-source = "git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8#74101dc21cfffb4c2d014fcc28edc166d5ca1b16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "93a3d51ad6abbc408b03ea962062bfcc959b438a318d7d4bedd181e1effd0610"
 dependencies = [
  "ansi_term 0.12.1",
  "atty",
  "build-helper",
- "cargo_metadata 0.13.1",
- "sp-maybe-compressed-blob",
+ "cargo_metadata 0.12.3",
  "tempfile",
  "toml",
  "walkdir",
@@ -12039,6 +12461,89 @@
 ]
 
 [[package]]
+name = "westend-runtime"
+version = "0.9.8"
+source = "git+https://github.com/paritytech/polkadot?branch=release-v0.9.8#3a10ee63c0b5703a1c802db3438ab7e01344a8ce"
+dependencies = [
+ "beefy-primitives",
+ "bitvec 0.20.4",
+ "frame-benchmarking",
+ "frame-election-provider-support",
+ "frame-executive",
+ "frame-support",
+ "frame-system",
+ "frame-system-benchmarking",
+ "frame-system-rpc-runtime-api",
+ "frame-try-runtime",
+ "hex-literal",
+ "log",
+ "max-encoded-len",
+ "pallet-authority-discovery",
+ "pallet-authorship",
+ "pallet-babe",
+ "pallet-balances",
+ "pallet-collective",
+ "pallet-democracy",
+ "pallet-election-provider-multi-phase",
+ "pallet-elections-phragmen",
+ "pallet-grandpa",
+ "pallet-identity",
+ "pallet-im-online",
+ "pallet-indices",
+ "pallet-membership",
+ "pallet-mmr-primitives",
+ "pallet-multisig",
+ "pallet-nicks",
+ "pallet-offences",
+ "pallet-offences-benchmarking",
+ "pallet-proxy",
+ "pallet-recovery",
+ "pallet-scheduler 3.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
+ "pallet-session",
+ "pallet-session-benchmarking",
+ "pallet-society",
+ "pallet-staking",
+ "pallet-staking-reward-curve",
+ "pallet-sudo",
+ "pallet-timestamp",
+ "pallet-transaction-payment",
+ "pallet-transaction-payment-rpc-runtime-api",
+ "pallet-treasury",
+ "pallet-utility",
+ "pallet-vesting",
+ "pallet-xcm",
+ "parity-scale-codec",
+ "polkadot-parachain",
+ "polkadot-primitives",
+ "polkadot-runtime-common",
+ "polkadot-runtime-parachains",
+ "rustc-hex",
+ "serde",
+ "serde_derive",
+ "smallvec 1.6.1",
+ "sp-api",
+ "sp-authority-discovery",
+ "sp-block-builder",
+ "sp-consensus-babe",
+ "sp-core",
+ "sp-inherents",
+ "sp-io",
+ "sp-npos-elections",
+ "sp-offchain",
+ "sp-runtime",
+ "sp-session",
+ "sp-staking",
+ "sp-std",
+ "sp-transaction-pool",
+ "sp-version",
+ "static_assertions",
+ "substrate-wasm-builder 4.0.0 (git+https://github.com/paritytech/substrate.git?branch=polkadot-v0.9.8)",
+ "xcm",
+ "xcm-builder",
+ "xcm-executor",
+]
+
+[[package]]
 name = "which"
 version = "4.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"

--- a/crates/evm-coder-macros/src/solidity_interface.rs
+++ b/crates/evm-coder-macros/src/solidity_interface.rs
@@ -1,16 +1,16 @@
 #![allow(dead_code)]
 
 use quote::quote;
-use darling::FromMeta;
+use darling::{FromMeta, ToTokens};
 use inflector::cases;
 use std::fmt::Write;
 use syn::{
-	FnArg, Generics, Ident, ImplItem, ImplItemMethod, ItemImpl, Meta, NestedMeta, PatType, Path,
-	ReturnType, Type, spanned::Spanned,
+	Expr, FnArg, GenericArgument, Generics, Ident, ImplItem, ImplItemMethod, ItemImpl, Lit, Meta,
+	NestedMeta, PatType, Path, PathArguments, ReturnType, Type, spanned::Spanned,
 };
 
 use crate::{
-	fn_selector_str, parse_ident_from_pat, parse_ident_from_path, parse_ident_from_type,
+	fn_selector_str, parse_ident_from_pat, parse_ident_from_path, parse_path, parse_path_segment,
 	parse_result_ok, pascal_ident_to_call, pascal_ident_to_snake_call, snake_ident_to_pascal,
 	snake_ident_to_screaming,
 };
@@ -73,6 +73,20 @@
 			}
 		}
 	}
+
+	fn expand_generator(&self) -> proc_macro2::TokenStream {
+		let pascal_call_name = &self.pascal_call_name;
+		quote! {
+			#pascal_call_name::generate_solidity_interface(tc, is_impl);
+		}
+	}
+
+	fn expand_event_generator(&self) -> proc_macro2::TokenStream {
+		let name = &self.name;
+		quote! {
+			#name::generate_solidity_interface(tc, is_impl);
+		}
+	}
 }
 
 #[derive(Default)]
@@ -107,29 +121,183 @@
 	rename_selector: Option<String>,
 }
 
+enum AbiType {
+	// type
+	Plain(Ident),
+	// (type1,type2)
+	Tuple(Vec<AbiType>),
+	// type[]
+	Vec(Box<AbiType>),
+	// type[20]
+	Array(Box<AbiType>, usize),
+}
+impl AbiType {
+	fn try_from(value: &Type) -> syn::Result<Self> {
+		let value = Self::try_maybe_special_from(value)?;
+		if value.is_special() {
+			return Err(syn::Error::new(value.span(), "unexpected special type"));
+		}
+		Ok(value)
+	}
+	fn try_maybe_special_from(value: &Type) -> syn::Result<Self> {
+		match value {
+			Type::Array(arr) => {
+				let wrapped = AbiType::try_from(&arr.elem)?;
+				match &arr.len {
+					Expr::Lit(l) => match &l.lit {
+						Lit::Int(i) => {
+							let num = i.base10_parse::<usize>()?;
+							Ok(AbiType::Array(Box::new(wrapped), num as usize))
+						}
+						_ => Err(syn::Error::new(arr.len.span(), "should be int literal")),
+					},
+					_ => Err(syn::Error::new(arr.len.span(), "should be literal")),
+				}
+			}
+			Type::Path(_) => {
+				let path = parse_path(value)?;
+				let segment = parse_path_segment(path)?;
+				if segment.ident == "Vec" {
+					let args = match &segment.arguments {
+						PathArguments::AngleBracketed(e) => e,
+						_ => {
+							return Err(syn::Error::new(
+								segment.arguments.span(),
+								"missing Vec generic",
+							))
+						}
+					};
+					let args = &args.args;
+					if args.len() != 1 {
+						return Err(syn::Error::new(
+							args.span(),
+							"expected only one generic for vec",
+						));
+					}
+					let arg = args.first().unwrap();
+
+					let ty = match arg {
+						GenericArgument::Type(ty) => ty,
+						_ => {
+							return Err(syn::Error::new(
+								arg.span(),
+								"expected first generic to be type",
+							))
+						}
+					};
+
+					let wrapped = AbiType::try_from(ty)?;
+					Ok(Self::Vec(Box::new(wrapped)))
+				} else {
+					if !segment.arguments.is_empty() {
+						return Err(syn::Error::new(
+							segment.arguments.span(),
+							"unexpected generic arguments for non-vec type",
+						));
+					}
+					Ok(Self::Plain(segment.ident.clone()))
+				}
+			}
+			Type::Tuple(t) => {
+				let mut out = Vec::with_capacity(t.elems.len());
+				for el in t.elems.iter() {
+					out.push(AbiType::try_from(el)?)
+				}
+				Ok(Self::Tuple(out))
+			}
+			_ => Err(syn::Error::new(
+				value.span(),
+				"unexpected type, only arrays, plain types and tuples are supported",
+			)),
+		}
+	}
+	fn is_value(&self) -> bool {
+		match self {
+			Self::Plain(v) if v == "value" => true,
+			_ => false,
+		}
+	}
+	fn is_caller(&self) -> bool {
+		match self {
+			Self::Plain(v) if v == "caller" => true,
+			_ => false,
+		}
+	}
+	fn is_special(&self) -> bool {
+		self.is_caller() || self.is_value()
+	}
+	fn selector_ty_buf(&self, buf: &mut String) -> std::fmt::Result {
+		match self {
+			AbiType::Plain(t) => {
+				write!(buf, "{}", t)
+			}
+			AbiType::Tuple(t) => {
+				write!(buf, "(")?;
+				for (i, t) in t.iter().enumerate() {
+					if i != 0 {
+						write!(buf, ",")?;
+					}
+					t.selector_ty_buf(buf)?;
+				}
+				write!(buf, ")")
+			}
+			AbiType::Vec(v) => {
+				v.selector_ty_buf(buf)?;
+				write!(buf, "[]")
+			}
+			AbiType::Array(v, len) => {
+				v.selector_ty_buf(buf)?;
+				write!(buf, "[{}]", len)
+			}
+		}
+	}
+	fn selector_ty(&self) -> String {
+		let mut out = String::new();
+		self.selector_ty_buf(&mut out).expect("no fmt error");
+		out
+	}
+}
+impl ToTokens for AbiType {
+	fn to_tokens(&self, tokens: &mut proc_macro2::TokenStream) {
+		match self {
+			AbiType::Plain(t) => tokens.extend(quote! {#t}),
+			AbiType::Tuple(t) => {
+				tokens.extend(quote! {(
+					#(#t),*
+				)});
+			}
+			AbiType::Vec(v) => tokens.extend(quote! {Vec<#v>}),
+			AbiType::Array(v, l) => tokens.extend(quote! {[#v; #l]}),
+		}
+	}
+}
+
 struct MethodArg {
 	name: Ident,
-	ty: Ident,
+	camel_name: String,
+	ty: AbiType,
 }
 impl MethodArg {
 	fn try_from(value: &PatType) -> syn::Result<Self> {
+		let name = parse_ident_from_pat(&value.pat)?.clone();
 		Ok(Self {
-			name: parse_ident_from_pat(&value.pat)?.clone(),
-			ty: parse_ident_from_type(&value.ty, false)?.clone(),
+			camel_name: cases::camelcase::to_camel_case(&name.to_string()),
+			name,
+			ty: AbiType::try_maybe_special_from(&value.ty)?,
 		})
 	}
 	fn is_value(&self) -> bool {
-		self.ty == "value"
+		self.ty.is_value()
 	}
 	fn is_caller(&self) -> bool {
-		self.ty == "caller"
+		self.ty.is_caller()
 	}
 	fn is_special(&self) -> bool {
-		self.is_value() || self.is_caller()
+		self.ty.is_special()
 	}
-	fn selector_ty(&self) -> &Ident {
+	fn selector_ty(&self) -> String {
 		assert!(!self.is_special());
-		&self.ty
+		self.ty.selector_ty()
 	}
 
 	fn expand_call_def(&self) -> proc_macro2::TokenStream {
@@ -168,10 +336,10 @@
 	}
 
 	fn expand_solidity_argument(&self) -> proc_macro2::TokenStream {
-		let name = &self.name.to_string();
+		let camel_name = &self.camel_name.to_string();
 		let ty = &self.ty;
 		quote! {
-			<NamedArgument<#ty>>::new(#name)
+			<NamedArgument<#ty>>::new(#camel_name)
 		}
 	}
 }
@@ -397,10 +565,16 @@
 		};
 		let result = &self.result;
 
-		let args = self.args.iter().map(MethodArg::expand_solidity_argument);
+		let args = self
+			.args
+			.iter()
+			.filter(|a| !a.is_special())
+			.map(MethodArg::expand_solidity_argument);
+		let selector = format!("{} {:0>8x}", self.selector_str, self.selector);
 
 		quote! {
 			SolidityFunction {
+				selector: #selector,
 				name: #camel_name,
 				mutability: #mutability,
 				args: (
@@ -475,6 +649,24 @@
 		let call_variants_this = self.methods.iter().map(Method::expand_variant_call);
 		let solidity_functions = self.methods.iter().map(Method::expand_solidity_function);
 
+		// TODO: Inline inline_is
+		let solidity_is = self
+			.info
+			.is
+			.0
+			.iter()
+			.chain(self.info.inline_is.0.iter())
+			.map(|is| is.name.to_string());
+		let solidity_events_is = self.info.events.0.iter().map(|is| is.name.to_string());
+		let solidity_generators = self
+			.info
+			.is
+			.0
+			.iter()
+			.chain(self.info.inline_is.0.iter())
+			.map(Is::expand_generator);
+		let solidity_event_generators = self.info.events.0.iter().map(Is::expand_event_generator);
+
 		// let methods = self.methods.iter().map(Method::solidity_def);
 
 		quote! {
@@ -505,18 +697,40 @@
 						)*
 					)
 				}
-				pub fn generate_solidity_interface() -> string {
+				pub fn generate_solidity_interface(tc: &evm_coder::solidity::TypeCollector, is_impl: bool) {
 					use evm_coder::solidity::*;
 					use core::fmt::Write;
 					let interface = SolidityInterface {
 						name: #solidity_name,
+						is: &["Dummy", #(
+							#solidity_is,
+						)* #(
+							#solidity_events_is,
+						)* ],
 						functions: (#(
 							#solidity_functions,
 						)*),
 					};
+					if is_impl {
+						tc.collect("// Common stubs holder\ncontract Dummy {\n\tuint8 dummy;\n\tstring stub_error = \"this contract is implemented in native\";\n}\n".into());
+					} else {
+						tc.collect("// Common stubs holder\ninterface Dummy {\n}\n".into());
+					}
+					#(
+						#solidity_generators
+					)*
+					#(
+						#solidity_event_generators
+					)*
+
 					let mut out = string::new();
-					let _ = interface.format(&mut out);
-					out
+					// In solidity interface usage (is) should be preceeded by interface definition
+					// This comment helps to sort it in a set
+					if #solidity_name.starts_with("Inline") {
+						out.push_str("// Inline\n");
+					}
+					let _ = interface.format(is_impl, &mut out, tc);
+					tc.collect(out);
 				}
 			}
 			impl ::evm_coder::Call for #call_name {

--- a/crates/evm-coder-macros/src/to_log.rs
+++ b/crates/evm-coder-macros/src/to_log.rs
@@ -1,3 +1,4 @@
+use inflector::cases;
 use syn::{Data, DeriveInput, Field, Fields, Ident, Variant, spanned::Spanned};
 use std::fmt::Write;
 use quote::quote;
@@ -6,6 +7,7 @@
 
 struct EventField {
 	name: Ident,
+	camel_name: String,
 	ty: Ident,
 	indexed: bool,
 }
@@ -24,10 +26,19 @@
 		}
 		Ok(Self {
 			name: name.to_owned(),
+			camel_name: cases::camelcase::to_camel_case(&name.to_string()),
 			ty: ty.to_owned(),
 			indexed,
 		})
 	}
+	fn expand_solidity_argument(&self) -> proc_macro2::TokenStream {
+		let camel_name = &self.camel_name;
+		let ty = &self.ty;
+		let indexed = self.indexed;
+		quote! {
+			<SolidityEventArgument<#ty>>::new(#indexed, #camel_name)
+		}
+	}
 }
 
 struct Event {
@@ -116,6 +127,21 @@
 			)*];
 		}
 	}
+
+	fn expand_solidity_function(&self) -> proc_macro2::TokenStream {
+		let name = self.name.to_string();
+		let args = self.fields.iter().map(EventField::expand_solidity_argument);
+		quote! {
+			SolidityEvent {
+				name: #name,
+				args: (
+					#(
+						#args,
+					)*
+				),
+			}
+		}
+	}
 }
 
 pub struct Events {
@@ -144,12 +170,30 @@
 
 		let consts = self.events.iter().map(Event::expand_consts);
 		let serializers = self.events.iter().map(Event::expand_serializers);
+		let solidity_name = self.name.to_string();
+		let solidity_functions = self.events.iter().map(Event::expand_solidity_function);
 
 		quote! {
 			impl #name {
 				#(
 					#consts
 				)*
+
+				pub fn generate_solidity_interface(tc: &evm_coder::solidity::TypeCollector, is_impl: bool) {
+					use evm_coder::solidity::*;
+					use core::fmt::Write;
+					let interface = SolidityInterface {
+						name: #solidity_name,
+						is: &[],
+						functions: (#(
+							#solidity_functions,
+						)*),
+					};
+					let mut out = string::new();
+					out.push_str("// Inline\n");
+					let _ = interface.format(is_impl, &mut out, tc);
+					tc.collect(out);
+				}
 			}
 
 			#[automatically_derived]

--- a/crates/evm-coder/src/abi.rs
+++ b/crates/evm-coder/src/abi.rs
@@ -19,11 +19,16 @@
 #[derive(Clone)]
 pub struct AbiReader<'i> {
 	buf: &'i [u8],
+	subresult_offset: usize,
 	offset: usize,
 }
 impl<'i> AbiReader<'i> {
 	pub fn new(buf: &'i [u8]) -> Self {
-		Self { buf, offset: 0 }
+		Self {
+			buf,
+			subresult_offset: 0,
+			offset: 0,
+		}
 	}
 	pub fn new_call(buf: &'i [u8]) -> Result<(u32, Self)> {
 		if buf.len() < 4 {
@@ -32,11 +37,18 @@
 		let mut method_id = [0; 4];
 		method_id.copy_from_slice(&buf[0..4]);
 
-		Ok((u32::from_be_bytes(method_id), Self { buf, offset: 4 }))
+		Ok((
+			u32::from_be_bytes(method_id),
+			Self {
+				buf,
+				subresult_offset: 4,
+				offset: 4,
+			},
+		))
 	}
 
 	fn read_padleft<const S: usize>(&mut self) -> Result<[u8; S]> {
-		if self.buf.len() - self.offset < 32 {
+		if self.buf.len() - self.offset < ABI_ALIGNMENT {
 			return Err(Error::Error(ExitError::OutOfOffset));
 		}
 		let mut block = [0; S];
@@ -79,6 +91,9 @@
 		}
 		Ok(subresult.buf[subresult.offset..subresult.offset + length].into())
 	}
+	pub fn string(&mut self) -> Result<string> {
+		string::from_utf8(self.bytes()?).map_err(|_| Error::Error(ExitError::InvalidRange))
+	}
 
 	pub fn uint32(&mut self) -> Result<u32> {
 		Ok(u32::from_be_bytes(self.read_padleft()?))
@@ -103,9 +118,13 @@
 
 	fn subresult(&mut self) -> Result<AbiReader<'i>> {
 		let offset = self.read_usize()?;
+		if offset + self.subresult_offset > self.buf.len() {
+			return Err(Error::Error(ExitError::InvalidRange));
+		}
 		Ok(AbiReader {
 			buf: self.buf,
-			offset: offset + self.offset,
+			subresult_offset: offset + self.subresult_offset,
+			offset: offset + self.subresult_offset,
 		})
 	}
 
@@ -192,11 +211,15 @@
 		self.memory(value.as_bytes())
 	}
 
+	pub fn bytes(&mut self, value: &[u8]) {
+		self.memory(value)
+	}
+
 	pub fn finish(mut self) -> Vec<u8> {
 		for (static_offset, part) in self.dynamic_part {
 			let part_offset = self.static_part.len();
 
-			let encoded_dynamic_offset = usize::to_be_bytes(part_offset - static_offset);
+			let encoded_dynamic_offset = usize::to_be_bytes(part_offset);
 			self.static_part[static_offset + ABI_ALIGNMENT - encoded_dynamic_offset.len()
 				..static_offset + ABI_ALIGNMENT]
 				.copy_from_slice(&encoded_dynamic_offset);
@@ -226,6 +249,60 @@
 impl_abi_readable!(H160, address);
 impl_abi_readable!(Vec<u8>, bytes);
 impl_abi_readable!(bool, bool);
+impl_abi_readable!(string, string);
+
+mod sealed {
+	/// Not all types can be placed in vec, i.e `Vec<u8>` is restricted, `bytes` should be used instead
+	pub trait CanBePlacedInVec {}
+}
+
+impl sealed::CanBePlacedInVec for U256 {}
+impl sealed::CanBePlacedInVec for string {}
+impl sealed::CanBePlacedInVec for H160 {}
+
+impl<R: sealed::CanBePlacedInVec> AbiRead<Vec<R>> for AbiReader<'_>
+where
+	Self: AbiRead<R>,
+{
+	fn abi_read(&mut self) -> Result<Vec<R>> {
+		let mut sub = self.subresult()?;
+		let size = sub.read_usize()?;
+		sub.subresult_offset = sub.offset;
+		let mut out = Vec::with_capacity(size);
+		for _ in 0..size {
+			out.push(<Self as AbiRead<R>>::abi_read(&mut sub)?);
+		}
+		Ok(out)
+	}
+}
+
+macro_rules! impl_tuples {
+	($($ident:ident)+) => {
+		impl<$($ident),+> sealed::CanBePlacedInVec for ($($ident,)+) {}
+		impl<$($ident),+> AbiRead<($($ident,)+)> for AbiReader<'_>
+		where
+			$(Self: AbiRead<$ident>),+
+		{
+			fn abi_read(&mut self) -> Result<($($ident,)+)> {
+				let mut subresult = self.subresult()?;
+				Ok((
+					$(<Self as AbiRead<$ident>>::abi_read(&mut subresult)?,)+
+				))
+			}
+		}
+	};
+}
+
+impl_tuples! {A}
+impl_tuples! {A B}
+impl_tuples! {A B C}
+impl_tuples! {A B C D}
+impl_tuples! {A B C D E}
+impl_tuples! {A B C D E F}
+impl_tuples! {A B C D E F G}
+impl_tuples! {A B C D E F G H}
+impl_tuples! {A B C D E F G H I}
+impl_tuples! {A B C D E F G H I J}
 
 pub trait AbiWrite {
 	fn abi_write(&self, writer: &mut AbiWriter);
@@ -253,6 +330,11 @@
 		writer.string(self)
 	}
 }
+impl AbiWrite for &Vec<u8> {
+	fn abi_write(&self, writer: &mut AbiWriter) {
+		writer.bytes(self)
+	}
+}
 
 impl AbiWrite for () {
 	fn abi_write(&self, _writer: &mut AbiWriter) {}
@@ -285,3 +367,103 @@
 		writer
 	}}
 }
+
+#[cfg(test)]
+pub mod test {
+	use crate::{
+		abi::AbiRead,
+		types::{string, uint256},
+	};
+
+	use super::{AbiReader, AbiWriter};
+	use hex_literal::hex;
+
+	#[test]
+	fn dynamic_after_static() {
+		let mut encoder = AbiWriter::new();
+		encoder.bool(&true);
+		encoder.string("test");
+		let encoded = encoder.finish();
+
+		let mut encoder = AbiWriter::new();
+		encoder.bool(&true);
+		// Offset to subresult
+		encoder.uint32(&(32 * 2));
+		// Len of "test"
+		encoder.uint32(&4);
+		encoder.write_padright(&[b't', b'e', b's', b't']);
+		let alternative_encoded = encoder.finish();
+
+		assert_eq!(encoded, alternative_encoded);
+
+		let mut decoder = AbiReader::new(&encoded);
+		assert_eq!(decoder.bool().unwrap(), true);
+		assert_eq!(decoder.string().unwrap(), "test");
+	}
+
+	#[test]
+	fn mint_sample() {
+		let (call, mut decoder) = AbiReader::new_call(&hex!(
+			"
+				50bb4e7f
+				000000000000000000000000ad2c0954693c2b5404b7e50967d3481bea432374
+				0000000000000000000000000000000000000000000000000000000000000001
+				0000000000000000000000000000000000000000000000000000000000000060
+				0000000000000000000000000000000000000000000000000000000000000008
+				5465737420555249000000000000000000000000000000000000000000000000
+			"
+		))
+		.unwrap();
+		assert_eq!(call, 0x50bb4e7f);
+		assert_eq!(
+			format!("{:?}", decoder.address().unwrap()),
+			"0xad2c0954693c2b5404b7e50967d3481bea432374"
+		);
+		assert_eq!(decoder.uint32().unwrap(), 1);
+		assert_eq!(decoder.string().unwrap(), "Test URI");
+	}
+
+	#[test]
+	fn mint_bulk() {
+		let (call, mut decoder) = AbiReader::new_call(&hex!(
+			"
+				36543006
+				00000000000000000000000053744e6da587ba10b32a2554d2efdcd985bc27a3 // address
+				0000000000000000000000000000000000000000000000000000000000000040 // offset of (uint256, string)[]
+				0000000000000000000000000000000000000000000000000000000000000003 // length of (uint256, string)[]
+
+				0000000000000000000000000000000000000000000000000000000000000060 // offset of first elem
+				00000000000000000000000000000000000000000000000000000000000000e0 // offset of second elem
+				0000000000000000000000000000000000000000000000000000000000000160 // offset of third elem
+
+				0000000000000000000000000000000000000000000000000000000000000001 // first token id?   					#60
+				0000000000000000000000000000000000000000000000000000000000000040 // offset of string
+				000000000000000000000000000000000000000000000000000000000000000a // size of string
+				5465737420555249203000000000000000000000000000000000000000000000 // string
+
+				000000000000000000000000000000000000000000000000000000000000000b // second token id? Why ==11?			#e0
+				0000000000000000000000000000000000000000000000000000000000000040 // offset of string
+				000000000000000000000000000000000000000000000000000000000000000a // size of string
+				5465737420555249203100000000000000000000000000000000000000000000 // string
+
+				000000000000000000000000000000000000000000000000000000000000000c // third token id?  Why ==12?			#160
+				0000000000000000000000000000000000000000000000000000000000000040 // offset of string
+				000000000000000000000000000000000000000000000000000000000000000a // size of string
+				5465737420555249203200000000000000000000000000000000000000000000 // string
+			"
+		))
+		.unwrap();
+		assert_eq!(call, 0x36543006);
+		let _ = decoder.address().unwrap();
+		let data =
+			<AbiReader<'_> as AbiRead<Vec<(uint256, string)>>>::abi_read(&mut decoder).unwrap();
+		assert_eq!(
+			data,
+			vec![
+				(1.into(), "Test URI 0".to_string()),
+				(11.into(), "Test URI 1".to_string()),
+				(12.into(), "Test URI 2".to_string())
+			]
+		);
+	}
+}

--- a/crates/evm-coder/src/lib.rs
+++ b/crates/evm-coder/src/lib.rs
@@ -61,6 +61,29 @@
 	fn call(&mut self, call: types::Msg<C>) -> execution::Result<AbiWriter>;
 }
 
+#[macro_export]
+macro_rules! generate_stubgen {
+	($name:ident, $decl:ident, $is_impl:literal) => {
+		#[test]
+		#[ignore]
+		fn $name() {
+			use evm_coder::solidity::TypeCollector;
+			let mut out = TypeCollector::new();
+			$decl::generate_solidity_interface(&mut out, $is_impl);
+			println!("=== SNIP START ===");
+			println!("// SPDX-License-Identifier: OTHER");
+			println!("// This code is automatically generated");
+			println!();
+			println!("pragma solidity >=0.8.0 <0.9.0;");
+			println!();
+			for b in out.finish() {
+				println!("{}", b);
+			}
+			println!("=== SNIP END ===");
+		}
+	};
+}
+
 #[cfg(test)]
 mod tests {
 	use super::*;

--- a/crates/evm-coder/src/solidity.rs
+++ b/crates/evm-coder/src/solidity.rs
@@ -1,40 +1,104 @@
 #[cfg(not(feature = "std"))]
-use alloc::{string::String};
-use core::{fmt, marker::PhantomData};
+use alloc::{
+	string::String,
+	vec::Vec,
+	collections::{BTreeSet, BTreeMap},
+	format,
+};
+#[cfg(feature = "std")]
+use std::collections::{BTreeSet, BTreeMap};
+use core::{
+	fmt::{self, Write},
+	marker::PhantomData,
+	cell::{Cell, RefCell},
+};
 use impl_trait_for_tuples::impl_for_tuples;
 use crate::types::*;
 
+#[derive(Default)]
+pub struct TypeCollector {
+	structs: RefCell<BTreeSet<string>>,
+	anonymous: RefCell<BTreeMap<Vec<string>, usize>>,
+	id: Cell<usize>,
+}
+impl TypeCollector {
+	pub fn new() -> Self {
+		Self::default()
+	}
+	pub fn collect(&self, item: string) {
+		self.structs.borrow_mut().insert(item);
+	}
+	pub fn next_id(&self) -> usize {
+		let v = self.id.get();
+		self.id.set(v + 1);
+		v
+	}
+	pub fn collect_tuple<T: SolidityTupleType>(&self) -> String {
+		let names = T::names(self);
+		if let Some(id) = self.anonymous.borrow().get(&names).cloned() {
+			return format!("Tuple{}", id);
+		}
+		let id = self.next_id();
+		let mut str = String::new();
+		writeln!(str, "// Anonymous struct").unwrap();
+		writeln!(str, "struct Tuple{} {{", id).unwrap();
+		for (i, name) in names.iter().enumerate() {
+			writeln!(str, "\t{} field_{};", name, i).unwrap();
+		}
+		writeln!(str, "}}").unwrap();
+		self.collect(str);
+		self.anonymous.borrow_mut().insert(names, id);
+		format!("Tuple{}", id)
+	}
+	pub fn finish(self) -> BTreeSet<string> {
+		self.structs.into_inner()
+	}
+}
+
 pub trait SolidityTypeName: 'static {
-	fn solidity_name(writer: &mut impl fmt::Write) -> fmt::Result;
+	fn solidity_name(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
+	fn is_simple() -> bool;
+	fn solidity_default(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
 	fn is_void() -> bool {
 		false
 	}
 }
-
 macro_rules! solidity_type_name {
-    ($($ty:ident => $name:expr),* $(,)?) => {
+    ($($ty:ty => $name:literal $simple:literal = $default:literal),* $(,)?) => {
         $(
             impl SolidityTypeName for $ty {
-                fn solidity_name(writer: &mut impl core::fmt::Write) -> core::fmt::Result {
+                fn solidity_name(writer: &mut impl core::fmt::Write, _tc: &TypeCollector) -> core::fmt::Result {
                     write!(writer, $name)
                 }
+				fn is_simple() -> bool {
+					$simple
+				}
+				fn solidity_default(writer: &mut impl core::fmt::Write, _tc: &TypeCollector) -> core::fmt::Result {
+					write!(writer, $default)
+				}
             }
         )*
     };
 }
 
 solidity_type_name! {
-	uint8 => "uint8",
-	uint32 => "uint32",
-	uint128 => "uint128",
-	uint256 => "uint256",
-	address => "address",
-	string => "memory string",
-	bytes => "memory bytes",
-	bool => "bool",
+	uint8 => "uint8" true = "0",
+	uint32 => "uint32" true = "0",
+	uint128 => "uint128" true = "0",
+	uint256 => "uint256" true = "0",
+	address => "address" true = "0x0000000000000000000000000000000000000000",
+	string => "string" false = "\"\"",
+	bytes => "bytes" false = "hex\"\"",
+	bool => "bool" true = "false",
 }
 impl SolidityTypeName for void {
-	fn solidity_name(_writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(_writer: &mut impl fmt::Write, _tc: &TypeCollector) -> fmt::Result {
+		Ok(())
+	}
+	fn is_simple() -> bool {
+		true
+	}
+	fn solidity_default(_writer: &mut impl fmt::Write, _tc: &TypeCollector) -> fmt::Result {
 		Ok(())
 	}
 	fn is_void() -> bool {
@@ -42,8 +106,88 @@
 	}
 }
 
+mod sealed {
+	pub trait CanBePlacedInVec {}
+}
+
+impl sealed::CanBePlacedInVec for uint256 {}
+impl sealed::CanBePlacedInVec for string {}
+impl sealed::CanBePlacedInVec for address {}
+
+impl<T: SolidityTypeName + sealed::CanBePlacedInVec> SolidityTypeName for Vec<T> {
+	fn solidity_name(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		T::solidity_name(writer, tc)?;
+		write!(writer, "[]")
+	}
+	fn is_simple() -> bool {
+		false
+	}
+	fn solidity_default(writer: &mut impl fmt::Write, _tc: &TypeCollector) -> fmt::Result {
+		write!(writer, "[]")
+	}
+}
+
+pub trait SolidityTupleType {
+	fn names(tc: &TypeCollector) -> Vec<String>;
+	fn len() -> usize;
+}
+
+macro_rules! count {
+    () => (0usize);
+    ( $x:tt $($xs:tt)* ) => (1usize + count!($($xs)*));
+}
+
+macro_rules! impl_tuples {
+	($($ident:ident)+) => {
+		impl<$($ident),+> sealed::CanBePlacedInVec for ($($ident,)+) {}
+		impl<$($ident: SolidityTypeName + 'static),+> SolidityTupleType for ($($ident,)+) {
+			fn names(tc: &TypeCollector) -> Vec<string> {
+				let mut collected = Vec::with_capacity(Self::len());
+				$({
+					let mut out = string::new();
+					$ident::solidity_name(&mut out, tc).expect("no fmt error");
+					collected.push(out);
+				})*;
+				collected
+			}
+
+			fn len() -> usize {
+				count!($($ident)*)
+			}
+		}
+		impl<$($ident: SolidityTypeName + 'static),+> SolidityTypeName for ($($ident,)+) {
+			fn solidity_name(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+				write!(writer, "{}", tc.collect_tuple::<Self>())
+			}
+			fn is_simple() -> bool {
+				false
+			}
+			fn solidity_default(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+				write!(writer, "{}(", tc.collect_tuple::<Self>())?;
+				$(
+					<$ident>::solidity_default(writer, tc)?;
+				)*
+				write!(writer, ")")
+			}
+		}
+	};
+}
+
+impl_tuples! {A}
+impl_tuples! {A B}
+impl_tuples! {A B C}
+impl_tuples! {A B C D}
+impl_tuples! {A B C D E}
+impl_tuples! {A B C D E F}
+impl_tuples! {A B C D E F G}
+impl_tuples! {A B C D E F G H}
+impl_tuples! {A B C D E F G H I}
+impl_tuples! {A B C D E F G H I J}
+
 pub trait SolidityArguments {
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result;
+	fn solidity_name(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
+	fn solidity_get(&self, writer: &mut impl fmt::Write) -> fmt::Result;
+	fn solidity_default(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
 	fn is_empty(&self) -> bool {
 		self.len() == 0
 	}
@@ -54,13 +198,23 @@
 pub struct UnnamedArgument<T>(PhantomData<*const T>);
 
 impl<T: SolidityTypeName> SolidityArguments for UnnamedArgument<T> {
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
 		if !T::is_void() {
-			T::solidity_name(writer)
+			T::solidity_name(writer, tc)?;
+			if !T::is_simple() {
+				write!(writer, " memory")?;
+			}
+			Ok(())
 		} else {
 			Ok(())
 		}
 	}
+	fn solidity_get(&self, _writer: &mut impl fmt::Write) -> fmt::Result {
+		Ok(())
+	}
+	fn solidity_default(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		T::solidity_default(writer, tc)
+	}
 	fn len(&self) -> usize {
 		if T::is_void() {
 			0
@@ -79,14 +233,58 @@
 }
 
 impl<T: SolidityTypeName> SolidityArguments for NamedArgument<T> {
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
 		if !T::is_void() {
-			T::solidity_name(writer)?;
+			T::solidity_name(writer, tc)?;
+			if !T::is_simple() {
+				write!(writer, " memory")?;
+			}
 			write!(writer, " {}", self.0)
 		} else {
 			Ok(())
 		}
 	}
+	fn solidity_get(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		writeln!(writer, "\t\t{};", self.0)
+	}
+	fn solidity_default(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		T::solidity_default(writer, tc)
+	}
+	fn len(&self) -> usize {
+		if T::is_void() {
+			0
+		} else {
+			1
+		}
+	}
+}
+
+pub struct SolidityEventArgument<T>(pub bool, &'static str, PhantomData<*const T>);
+
+impl<T> SolidityEventArgument<T> {
+	pub fn new(indexed: bool, name: &'static str) -> Self {
+		Self(indexed, name, Default::default())
+	}
+}
+
+impl<T: SolidityTypeName> SolidityArguments for SolidityEventArgument<T> {
+	fn solidity_name(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		if !T::is_void() {
+			T::solidity_name(writer, tc)?;
+			if self.0 {
+				write!(writer, " indexed")?;
+			}
+			write!(writer, " {}", self.1)
+		} else {
+			Ok(())
+		}
+	}
+	fn solidity_get(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		writeln!(writer, "\t\t{};", self.1)
+	}
+	fn solidity_default(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		T::solidity_default(writer, tc)
+	}
 	fn len(&self) -> usize {
 		if T::is_void() {
 			0
@@ -97,7 +295,13 @@
 }
 
 impl SolidityArguments for () {
-	fn solidity_name(&self, _writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(&self, _writer: &mut impl fmt::Write, _tc: &TypeCollector) -> fmt::Result {
+		Ok(())
+	}
+	fn solidity_get(&self, _writer: &mut impl fmt::Write) -> fmt::Result {
+		Ok(())
+	}
+	fn solidity_default(&self, _writer: &mut impl fmt::Write, _tc: &TypeCollector) -> fmt::Result {
 		Ok(())
 	}
 	fn len(&self) -> usize {
@@ -109,7 +313,7 @@
 impl SolidityArguments for Tuple {
 	for_tuples!( where #( Tuple: SolidityArguments ),* );
 
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
 		let mut first = true;
 		for_tuples!( #(
             if !Tuple.is_empty() {
@@ -117,18 +321,53 @@
                     write!(writer, ", ")?;
                 }
                 first = false;
-                Tuple.solidity_name(writer)?;
+                Tuple.solidity_name(writer, tc)?;
             }
         )* );
 		Ok(())
 	}
+	fn solidity_get(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+		for_tuples!( #(
+            Tuple.solidity_get(writer)?;
+        )* );
+		Ok(())
+	}
+	fn solidity_default(&self, writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result {
+		if self.is_empty() {
+			Ok(())
+		} else if self.len() == 1 {
+			for_tuples!( #(
+				Tuple.solidity_default(writer, tc)?;
+			)* );
+			Ok(())
+		} else {
+			write!(writer, "(")?;
+			let mut first = true;
+			for_tuples!( #(
+				if !Tuple.is_empty() {
+					if !first {
+						write!(writer, ", ")?;
+					}
+					first = false;
+					Tuple.solidity_default(writer, tc)?;
+				}
+			)* );
+			write!(writer, ")")?;
+			Ok(())
+		}
+	}
 	fn len(&self) -> usize {
 		for_tuples!( #( Tuple.len() )+* )
 	}
 }
 
 pub trait SolidityFunctions {
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result;
+	fn solidity_name(
+		&self,
+		is_impl: bool,
+		writer: &mut impl fmt::Write,
+		tc: &TypeCollector,
+	) -> fmt::Result;
 }
 
 pub enum SolidityMutability {
@@ -137,16 +376,28 @@
 	Mutable,
 }
 pub struct SolidityFunction<A, R> {
+	pub selector: &'static str,
 	pub name: &'static str,
 	pub args: A,
 	pub result: R,
 	pub mutability: SolidityMutability,
 }
 impl<A: SolidityArguments, R: SolidityArguments> SolidityFunctions for SolidityFunction<A, R> {
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
-		write!(writer, "function {}(", self.name)?;
-		self.args.solidity_name(writer)?;
-		write!(writer, ") external")?;
+	fn solidity_name(
+		&self,
+		is_impl: bool,
+		writer: &mut impl fmt::Write,
+		tc: &TypeCollector,
+	) -> fmt::Result {
+		writeln!(writer, "\t// Selector: {}", self.selector)?;
+		write!(writer, "\tfunction {}(", self.name)?;
+		self.args.solidity_name(writer, tc)?;
+		write!(writer, ")")?;
+		if is_impl {
+			write!(writer, " public")?;
+		} else {
+			write!(writer, " external")?;
+		}
 		match &self.mutability {
 			SolidityMutability::Pure => write!(writer, " pure")?,
 			SolidityMutability::View => write!(writer, " view")?,
@@ -154,10 +405,28 @@
 		}
 		if !self.result.is_empty() {
 			write!(writer, " returns (")?;
-			self.result.solidity_name(writer)?;
+			self.result.solidity_name(writer, tc)?;
 			write!(writer, ")")?;
 		}
-		writeln!(writer, ";")
+		if is_impl {
+			writeln!(writer, " {{")?;
+			writeln!(writer, "\t\trequire(false, stub_error);")?;
+			self.args.solidity_get(writer)?;
+			match &self.mutability {
+				SolidityMutability::Pure => {}
+				SolidityMutability::View => writeln!(writer, "\t\tdummy;")?,
+				SolidityMutability::Mutable => writeln!(writer, "\t\tdummy = 0;")?,
+			}
+			if !self.result.is_empty() {
+				write!(writer, "\t\treturn ")?;
+				self.result.solidity_default(writer, tc)?;
+				writeln!(writer, ";")?;
+			}
+			writeln!(writer, "\t}}")?;
+		} else {
+			writeln!(writer, ";")?;
+		}
+		Ok(())
 	}
 }
 
@@ -165,10 +434,15 @@
 impl SolidityFunctions for Tuple {
 	for_tuples!( where #( Tuple: SolidityFunctions ),* );
 
-	fn solidity_name(&self, writer: &mut impl fmt::Write) -> fmt::Result {
+	fn solidity_name(
+		&self,
+		is_impl: bool,
+		writer: &mut impl fmt::Write,
+		tc: &TypeCollector,
+	) -> fmt::Result {
 		let mut first = false;
 		for_tuples!( #(
-            Tuple.solidity_name(writer)?;
+            Tuple.solidity_name(is_impl, writer, tc)?;
         )* );
 		Ok(())
 	}
@@ -176,14 +450,53 @@
 
 pub struct SolidityInterface<F: SolidityFunctions> {
 	pub name: &'static str,
+	pub is: &'static [&'static str],
 	pub functions: F,
 }
 
 impl<F: SolidityFunctions> SolidityInterface<F> {
-	pub fn format(&self, out: &mut impl fmt::Write) -> fmt::Result {
-		writeln!(out, "interface {} {{", self.name)?;
-		self.functions.solidity_name(out)?;
+	pub fn format(
+		&self,
+		is_impl: bool,
+		out: &mut impl fmt::Write,
+		tc: &TypeCollector,
+	) -> fmt::Result {
+		if is_impl {
+			write!(out, "contract ")?;
+		} else {
+			write!(out, "interface ")?;
+		}
+		write!(out, "{}", self.name)?;
+		if !self.is.is_empty() {
+			write!(out, " is")?;
+			for (i, n) in self.is.iter().enumerate() {
+				if i != 0 {
+					write!(out, ",")?;
+				}
+				write!(out, " {}", n)?;
+			}
+		}
+		writeln!(out, " {{")?;
+		self.functions.solidity_name(is_impl, out, tc)?;
 		writeln!(out, "}}")?;
 		Ok(())
 	}
 }
+
+pub struct SolidityEvent<A> {
+	pub name: &'static str,
+	pub args: A,
+}
+
+impl<A: SolidityArguments> SolidityFunctions for SolidityEvent<A> {
+	fn solidity_name(
+		&self,
+		_is_impl: bool,
+		writer: &mut impl fmt::Write,
+		tc: &TypeCollector,
+	) -> fmt::Result {
+		write!(writer, "\tevent {}(", self.name)?;
+		self.args.solidity_name(writer, tc)?;
+		writeln!(writer, ");")
+	}
+}

--- a/crates/evm-coder/tests/a.rs
+++ b/crates/evm-coder/tests/a.rs
@@ -2,6 +2,7 @@
 
 use evm_coder::{solidity_interface, types::*, ToLog, execution::Result};
 use evm_coder_macros::solidity;
+use std as sp_std;
 
 struct Impls;
 

--- a/node/cli/Cargo.toml
+++ b/node/cli/Cargo.toml
@@ -317,4 +317,7 @@
 
 [features]
 default = []
-runtime-benchmarks = ['nft-runtime/runtime-benchmarks']
+runtime-benchmarks = [
+    'nft-runtime/runtime-benchmarks',
+    'polkadot-service/runtime-benchmarks',
+]

--- a/node/cli/src/chain_spec.rs
+++ b/node/cli/src/chain_spec.rs
@@ -202,18 +202,6 @@
 			nft_item_id: vec![],
 			fungible_item_id: vec![],
 			refungible_item_id: vec![],
-			chain_limit: ChainLimits {
-				collection_numbers_limit: 100000,
-				account_token_ownership_limit: 1000000,
-				collections_admins_limit: 5,
-				custom_data_limit: 2048,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-				const_on_chain_schema_limit: 1024,
-			},
 		},
 		parachain_info: nft_runtime::ParachainInfoConfig { parachain_id: id },
 		aura: nft_runtime::AuraConfig {

--- a/pallets/evm-contract-helpers/src/eth.rs
+++ b/pallets/evm-contract-helpers/src/eth.rs
@@ -1,5 +1,5 @@
 use core::marker::PhantomData;
-use evm_coder::{abi::AbiWriter, execution::Result, solidity_interface, types::*};
+use evm_coder::{abi::AbiWriter, execution::Result, generate_stubgen, solidity_interface, types::*};
 use pallet_evm_coder_substrate::SubstrateRecorder;
 use pallet_evm::{ExitReason, ExitRevert, OnCreate, OnMethodCall, PrecompileOutput};
 use sp_core::H160;
@@ -14,76 +14,76 @@
 
 #[solidity_interface(name = "ContractHelpers")]
 impl<T: Config> ContractHelpers<T> {
-	fn contract_owner(&self, contract: address) -> Result<address> {
+	fn contract_owner(&self, contract_address: address) -> Result<address> {
 		self.0.consume_sload()?;
-		Ok(<Owner<T>>::get(contract))
+		Ok(<Owner<T>>::get(contract_address))
 	}
 
-	fn sponsoring_enabled(&self, contract: address) -> Result<bool> {
+	fn sponsoring_enabled(&self, contract_address: address) -> Result<bool> {
 		self.0.consume_sload()?;
-		Ok(<SelfSponsoring<T>>::get(contract))
+		Ok(<SelfSponsoring<T>>::get(contract_address))
 	}
 
 	fn toggle_sponsoring(
 		&mut self,
 		caller: caller,
-		contract: address,
+		contract_address: address,
 		enabled: bool,
 	) -> Result<void> {
 		self.0.consume_sload()?;
-		<Pallet<T>>::ensure_owner(contract, caller)?;
+		<Pallet<T>>::ensure_owner(contract_address, caller)?;
 		self.0.consume_sstore()?;
-		<Pallet<T>>::toggle_sponsoring(contract, enabled);
+		<Pallet<T>>::toggle_sponsoring(contract_address, enabled);
 		Ok(())
 	}
 
 	fn set_sponsoring_rate_limit(
 		&mut self,
 		caller: caller,
-		contract: address,
+		contract_address: address,
 		rate_limit: uint32,
 	) -> Result<void> {
 		self.0.consume_sload()?;
-		<Pallet<T>>::ensure_owner(contract, caller)?;
+		<Pallet<T>>::ensure_owner(contract_address, caller)?;
 		self.0.consume_sstore()?;
-		<Pallet<T>>::set_sponsoring_rate_limit(contract, rate_limit.into());
+		<Pallet<T>>::set_sponsoring_rate_limit(contract_address, rate_limit.into());
 		Ok(())
 	}
 
-	fn allowed(&self, contract: address, user: address) -> Result<bool> {
+	fn allowed(&self, contract_address: address, user: address) -> Result<bool> {
 		self.0.consume_sload()?;
-		Ok(<Pallet<T>>::allowed(contract, user, true))
+		Ok(<Pallet<T>>::allowed(contract_address, user, true))
 	}
 
-	fn allowlist_enabled(&self, contract: address) -> Result<bool> {
+	fn allowlist_enabled(&self, contract_address: address) -> Result<bool> {
 		self.0.consume_sload()?;
-		Ok(<AllowlistEnabled<T>>::get(contract))
+		Ok(<AllowlistEnabled<T>>::get(contract_address))
 	}
 
 	fn toggle_allowlist(
 		&mut self,
 		caller: caller,
-		contract: address,
+		contract_address: address,
 		enabled: bool,
 	) -> Result<void> {
 		self.0.consume_sload()?;
-		<Pallet<T>>::ensure_owner(contract, caller)?;
+		<Pallet<T>>::ensure_owner(contract_address, caller)?;
 		self.0.consume_sstore()?;
-		<Pallet<T>>::toggle_allowlist(contract, enabled);
+		<Pallet<T>>::toggle_allowlist(contract_address, enabled);
 		Ok(())
 	}
 
 	fn toggle_allowed(
 		&mut self,
 		caller: caller,
-		contract: address,
+		contract_address: address,
 		user: address,
 		allowed: bool,
 	) -> Result<void> {
 		self.0.consume_sload()?;
-		<Pallet<T>>::ensure_owner(contract, caller)?;
+		<Pallet<T>>::ensure_owner(contract_address, caller)?;
 		self.0.consume_sstore()?;
-		<Pallet<T>>::toggle_allowed(contract, user, allowed);
+		<Pallet<T>>::toggle_allowed(contract_address, user, allowed);
 		Ok(())
 	}
 }
@@ -130,7 +130,7 @@
 
 	fn get_code(contract: &sp_core::H160) -> Option<Vec<u8>> {
 		(contract == &T::ContractAddress::get())
-			.then(|| include_bytes!("./stubs/ContractHelpers.bin").to_vec())
+			.then(|| include_bytes!("./stubs/ContractHelpers.raw").to_vec())
 	}
 }
 
@@ -162,3 +162,6 @@
 		None
 	}
 }
+
+generate_stubgen!(contract_helpers_impl, ContractHelpersCall, true);
+generate_stubgen!(contract_helpers_iface, ContractHelpersCall, false);

--- a/pallets/evm-contract-helpers/src/stubs/ContractHelpers.sol
+++ b/pallets/evm-contract-helpers/src/stubs/ContractHelpers.sol
@@ -1,40 +1,100 @@
-contract ContractHelpers {
-    uint8 _dummmy = 0;
-    address _dummy_addr = 0x0000000000000000000000000000000000000000;
-	string stub_error = "this contract does not exists, contract helpers are implemented on substrate chain side";
+// SPDX-License-Identifier: OTHER
+// This code is automatically generated
+
+pragma solidity >=0.8.0 <0.9.0;
+
+// Common stubs holder
+contract Dummy {
+	uint8 dummy;
+	string stub_error = "this contract is implemented in native";
+}
+
+contract ContractHelpers is Dummy {
+	// Selector: contractOwner(address) 5152b14c
+	function contractOwner(address contractAddress)
+		public
+		view
+		returns (address)
+	{
+		require(false, stub_error);
+		contractAddress;
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
+	}
+
+	// Selector: sponsoringEnabled(address) 6027dc61
+	function sponsoringEnabled(address contractAddress)
+		public
+		view
+		returns (bool)
+	{
+		require(false, stub_error);
+		contractAddress;
+		dummy;
+		return false;
+	}
+
+	// Selector: toggleSponsoring(address,bool) fcac6d86
+	function toggleSponsoring(address contractAddress, bool enabled) public {
+		require(false, stub_error);
+		contractAddress;
+		enabled;
+		dummy = 0;
+	}
+
+	// Selector: setSponsoringRateLimit(address,uint32) 77b6c908
+	function setSponsoringRateLimit(address contractAddress, uint32 rateLimit)
+		public
+	{
+		require(false, stub_error);
+		contractAddress;
+		rateLimit;
+		dummy = 0;
+	}
+
+	// Selector: allowed(address,address) 5c658165
+	function allowed(address contractAddress, address user)
+		public
+		view
+		returns (bool)
+	{
+		require(false, stub_error);
+		contractAddress;
+		user;
+		dummy;
+		return false;
+	}
+
+	// Selector: allowlistEnabled(address) c772ef6c
+	function allowlistEnabled(address contractAddress)
+		public
+		view
+		returns (bool)
+	{
+		require(false, stub_error);
+		contractAddress;
+		dummy;
+		return false;
+	}
 
-    function contractOwner(address contract_address) public view returns (address) {
-        require(false, stub_error);
-        contract_address;
-        return _dummy_addr;
-    }
-    
-    function sponsoringEnabled(address contract_address) public view returns (bool) {
-        require(false, stub_error);
-        contract_address;
-        _dummmy;
-        return false;
-    }
-    
-    function toggleSponsoring(address contract_address, bool enabled) public {
-        require(false, stub_error);
-        contract_address;
-        enabled;
-        _dummmy = 0;
-    }
-    
-    function toggleAllowlist(address contract_address, bool enabled) public {
-        require(false, stub_error);
-        contract_address;
-        enabled;
-        _dummmy = 0;
-    }
-    
-    function toggleAllowed(address contract_address, address user, bool allowed) public {
-        require(false, stub_error);
-        contract_address;
-        user;
-        allowed;
-        _dummmy = 0;
-    }
-}
\ No newline at end of file
+	// Selector: toggleAllowlist(address,bool) 36de20f5
+	function toggleAllowlist(address contractAddress, bool enabled) public {
+		require(false, stub_error);
+		contractAddress;
+		enabled;
+		dummy = 0;
+	}
+
+	// Selector: toggleAllowed(address,address,bool) 4706cc1c
+	function toggleAllowed(
+		address contractAddress,
+		address user,
+		bool allowed
+	) public {
+		require(false, stub_error);
+		contractAddress;
+		user;
+		allowed;
+		dummy = 0;
+	}
+}

--- a/pallets/nft-transaction-payment/src/lib.rs
+++ b/pallets/nft-transaction-payment/src/lib.rs
@@ -11,9 +11,6 @@
 #[cfg(feature = "std")]
 pub use serde::*;
 
-#[cfg(feature = "runtime-benchmarks")]
-mod benchmarking;
-
 use frame_support::{decl_module, decl_storage};
 use sp_std::prelude::*;
 use up_sponsorship::SponsorshipHandler;

--- a/pallets/nft/Cargo.toml
+++ b/pallets/nft/Cargo.toml
@@ -41,6 +41,7 @@
     'evm-coder/std',
     'pallet-evm-coder-substrate/std',
 ]
+limit-testing = ["nft-data-structs/limit-testing"]
 
 ################################################################################
 # Substrate Dependencies

--- a/pallets/nft/src/benchmarking.rs
+++ b/pallets/nft/src/benchmarking.rs
@@ -1,419 +1,342 @@
 #![cfg(feature = "runtime-benchmarks")]
 
 use super::*;
-use crate::Module as Nft;
-
-use sp_std::prelude::*;
+use crate::Pallet;
 use frame_system::RawOrigin;
-use frame_benchmarking::{benchmarks, account, whitelisted_caller}; // , TrackedStorageKey,
+use frame_benchmarking::{benchmarks, account};
+use nft_data_structs::*;
+use core::convert::TryInto;
+use sp_runtime::DispatchError;
 
 const SEED: u32 = 1;
-/*
+
+fn create_data(size: usize) -> Vec<u8> {
+	(0..size).map(|v| (v & 0xff) as u8).collect()
+}
+fn create_u16_data(size: usize) -> Vec<u16> {
+	(0..size).map(|v| (v & 0xffff) as u16).collect()
+}
+
 fn default_nft_data() -> CreateItemData {
-	CreateItemData::NFT(CreateNftData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+	CreateItemData::NFT(CreateNftData {
+		const_data: create_data(CUSTOM_DATA_LIMIT as usize).try_into().unwrap(),
+		variable_data: create_data(CUSTOM_DATA_LIMIT as usize).try_into().unwrap(),
+	})
 }
 
-fn default_fungible_data () -> CreateItemData {
-	CreateItemData::Fungible(CreateFungibleData { })
+fn default_fungible_data() -> CreateItemData {
+	CreateItemData::Fungible(CreateFungibleData { value: 1000 })
 }
 
-fn default_re_fungible_data () -> CreateItemData {
-	CreateItemData::ReFungible(CreateReFungibleData { const_data: vec![1, 2, 3], variable_data: vec![3, 2, 1] })
+fn default_re_fungible_data() -> CreateItemData {
+	CreateItemData::ReFungible(CreateReFungibleData {
+		const_data: create_data(CUSTOM_DATA_LIMIT as usize).try_into().unwrap(),
+		variable_data: create_data(CUSTOM_DATA_LIMIT as usize).try_into().unwrap(),
+		pieces: 1000,
+	})
+}
+
+fn create_collection_helper<T: Config>(
+	owner: T::AccountId,
+	mode: CollectionMode,
+) -> Result<CollectionId, DispatchError> {
+	T::Currency::deposit_creating(&owner, T::CollectionCreationPrice::get());
+	let col_name = create_u16_data(MAX_COLLECTION_NAME_LENGTH)
+		.try_into()
+		.unwrap();
+	let col_desc = create_u16_data(MAX_COLLECTION_DESCRIPTION_LENGTH)
+		.try_into()
+		.unwrap();
+	let token_prefix = create_data(MAX_TOKEN_PREFIX_LENGTH).try_into().unwrap();
+	<Pallet<T>>::create_collection(
+		RawOrigin::Signed(owner).into(),
+		col_name,
+		col_desc,
+		token_prefix,
+		mode,
+	)?;
+	Ok(CreatedCollectionCount::get())
+}
+fn create_nft_collection<T: Config>(owner: T::AccountId) -> Result<CollectionId, DispatchError> {
+	create_collection_helper::<T>(owner, CollectionMode::NFT)
+}
+fn create_fungible_collection<T: Config>(
+	owner: T::AccountId,
+) -> Result<CollectionId, DispatchError> {
+	create_collection_helper::<T>(owner, CollectionMode::Fungible(0))
+}
+fn create_refungible_collection<T: Config>(
+	owner: T::AccountId,
+) -> Result<CollectionId, DispatchError> {
+	create_collection_helper::<T>(owner, CollectionMode::ReFungible)
 }
-*/
 
 benchmarks! {
 
 	create_collection {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
+		let col_name: Vec<u16> = create_u16_data(MAX_COLLECTION_NAME_LENGTH);
+		let col_desc: Vec<u16> = create_u16_data(MAX_COLLECTION_DESCRIPTION_LENGTH);
+		let token_prefix: Vec<u8> = create_data(MAX_TOKEN_PREFIX_LENGTH);
 		let mode: CollectionMode = CollectionMode::NFT;
 		let caller: T::AccountId = account("caller", 0, SEED);
-	}: _(RawOrigin::Signed(caller.clone()), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode)
-/*
+		T::Currency::deposit_creating(&caller, T::CollectionCreationPrice::get());
+	}: _(RawOrigin::Signed(caller.clone()), col_name.clone(), col_desc.clone(), token_prefix.clone(), mode)
 	verify {
-		assert_eq!(Nft::<T>::collection_id(2).owner, caller);
+		assert_eq!(<Pallet<T>>::collection_id(2).unwrap().owner, caller);
 	}
+
 	destroy_collection {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: _(RawOrigin::Signed(caller.clone()), 2)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection)
 
 	add_to_white_list {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
+		let caller: T::AccountId = account("caller", 0, SEED);
 		let whitelist_account: T::AccountId = account("admin", 0, SEED);
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: add_to_white_list(RawOrigin::Signed(caller.clone()), 2, whitelist_account)
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(whitelist_account))
 
 	remove_from_white_list {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
+		let caller: T::AccountId = account("caller", 0, SEED);
 		let whitelist_account: T::AccountId = account("admin", 0, SEED);
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		Nft::<T>::add_to_white_list(RawOrigin::Signed(caller.clone()).into(), 2, whitelist_account.clone())?;
-	}: remove_from_white_list(RawOrigin::Signed(caller.clone()), 2, whitelist_account)
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		<Pallet<T>>::add_to_white_list(RawOrigin::Signed(caller.clone()).into(), collection, T::CrossAccountId::from_sub(whitelist_account.clone()))?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(whitelist_account))
 
 	set_public_access_mode {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: set_public_access_mode(RawOrigin::Signed(caller.clone()), 2, AccessMode::WhiteList)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, AccessMode::WhiteList)
 
 	set_mint_permission {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: set_mint_permission(RawOrigin::Signed(caller.clone()), 2, true)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, true)
 
 	change_collection_owner {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let new_owner: T::AccountId = account("admin", 0, SEED);
-	}: change_collection_owner(RawOrigin::Signed(caller.clone()), 2, new_owner)
+	}: _(RawOrigin::Signed(caller.clone()), collection, new_owner)
 
 	add_collection_admin {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let new_admin: T::AccountId = account("admin", 0, SEED);
-	}: add_collection_admin(RawOrigin::Signed(caller.clone()), 2, new_admin)
+	}: _(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(new_admin))
 
 	remove_collection_admin {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let new_admin: T::AccountId = account("admin", 0, SEED);
-		Nft::<T>::add_collection_admin(RawOrigin::Signed(caller.clone()).into(), 2, new_admin.clone())?;
-	}: remove_collection_admin(RawOrigin::Signed(caller.clone()), 2, new_admin)
+		<Pallet<T>>::add_collection_admin(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(new_admin.clone()))?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(new_admin))
 
 	set_collection_sponsor {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: set_collection_sponsor(RawOrigin::Signed(caller.clone()), 2, caller.clone())
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, caller.clone())
 
 	confirm_sponsorship {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		Nft::<T>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
-	}: confirm_sponsorship(RawOrigin::Signed(caller.clone()), 2)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		<Pallet<T>>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection)
 
 	remove_collection_sponsor {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		Nft::<T>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
-		Nft::<T>::confirm_sponsorship(RawOrigin::Signed(caller.clone()).into(), 2)?;
-	}: remove_collection_sponsor(RawOrigin::Signed(caller.clone()), 2)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		<Pallet<T>>::set_collection_sponsor(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone())?;
+		<Pallet<T>>::confirm_sponsorship(RawOrigin::Signed(caller.clone()).into(), 2)?;
+	}: _(RawOrigin::Signed(caller.clone()), collection)
 
 	// nft item
 	create_item_nft {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_nft_data();
+		let b in 0..(CUSTOM_DATA_LIMIT * 2);
 
-	}: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = CreateItemData::NFT(CreateNftData {
+			const_data: create_data(b.min(CUSTOM_DATA_LIMIT) as usize).try_into().unwrap(),
+			variable_data: create_data(b.saturating_sub(CUSTOM_DATA_LIMIT) as usize).try_into().unwrap(),
+		});
+	}: create_item(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
 
-	#[extra]
-	create_item_nft_large {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		let mut nft_data = CreateNftData {
-			const_data: vec![],
-			variable_data: vec![]
-		};
-		for i in 0..1998 {
-			nft_data.const_data.push(10);
-			nft_data.variable_data.push(10);
-		}
-		let data = CreateItemData::NFT(nft_data);
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+	create_multiple_items_nft {
+		// TODO: Take item data size into account. As create_item_nft bench shows, this parameter has no effect on execution time,
+		// but it may if we increase CUSTOM_DATA_LIMIT
+		let b in 1..1000;
 
-	}: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = (0..b).map(|_| default_nft_data()).collect();
+	}: create_multiple_items(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
 
 	// fungible item
 	create_item_fungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::Fungible(3);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_fungible_data();
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_fungible_collection::<T>(caller.clone())?;
+		let data = CreateItemData::Fungible(CreateFungibleData {
+			value: 1000,
+		});
+	}: create_item(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
+
+	create_multiple_items_fungible {
+		let b in 1..1000;
 
-	}: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_fungible_collection::<T>(caller.clone())?;
+		let data = (0..b).map(|_| default_fungible_data()).collect();
+	}: create_multiple_items(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
 
 	// refungible item
 	create_item_refungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_re_fungible_data();
+		let b in 0..(CUSTOM_DATA_LIMIT * 2);
 
-	}: create_item(RawOrigin::Signed(caller.clone()), 2, caller.clone(), data)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_refungible_collection::<T>(caller.clone())?;
+		let data = CreateItemData::ReFungible(CreateReFungibleData {
+			const_data: create_data(b.min(CUSTOM_DATA_LIMIT) as usize).try_into().unwrap(),
+			variable_data: create_data(b.saturating_sub(CUSTOM_DATA_LIMIT) as usize).try_into().unwrap(),
+			pieces: 1000,
+		});
+	}: create_item(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
 
-	burn_item {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_nft_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
+	create_multiple_items_refungible {
+		// TODO: Take item data size into account. As create_item_nft bench shows, this parameter has no effect on execution time,
+		// but it may if we increase CUSTOM_DATA_LIMIT
+		let b in 1..1000;
 
-	}: burn_item(RawOrigin::Signed(caller.clone()), 2, 1)
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_refungible_collection::<T>(caller.clone())?;
+		let data = (0..b).map(|_| default_re_fungible_data()).collect();
+	}: create_multiple_items(RawOrigin::Signed(caller.clone()), collection, T::CrossAccountId::from_sub(caller.clone()), data)
 
+	burn_item_nft {
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = default_nft_data();
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), collection, T::CrossAccountId::from_sub(caller.clone()), data)?;
+	}: burn_item(RawOrigin::Signed(caller.clone()), collection, 1, 1)
+
 	transfer_nft {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_nft_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-
-	}: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), collection, T::CrossAccountId::from_sub(caller.clone()), data)?;
+	}: transfer(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), collection, 1, 1)
 
 	transfer_fungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::Fungible(3);
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_fungible_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_fungible_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-
-	}: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), collection, T::CrossAccountId::from_sub(caller.clone()), data)?;
+	}: transfer(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), collection, 1, 1)
 
 	transfer_refungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_refungible_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_re_fungible_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), collection, T::CrossAccountId::from_sub(caller.clone()), data)?;
+	}: transfer(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), collection, 1, 1)
 
-	}: transfer(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1, 1)
+	set_transfers_enabled_flag {
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+	}: _(RawOrigin::Signed(caller.clone()), collection, false)
 
-	approve {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
+	approve_nft {
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_re_fungible_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-
-	}: approve(RawOrigin::Signed(caller.clone()), recipient.clone(), 2, 1)
+		let data = default_nft_data();
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(caller.clone()), data)?;
+	}: approve(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), collection, 1, 1)
 
 	// Nft
 	transfer_from_nft {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_nft_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-		Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
-
-	}: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(caller.clone()), data)?;
+		<Pallet<T>>::approve(RawOrigin::Signed(caller.clone()).into(), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)?;
+	}: transfer_from(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)
 
 	// Fungible
 	transfer_from_fungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::Fungible(3);
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_fungible_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_fungible_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-		Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
-
-	}: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(caller.clone()), data)?;
+		<Pallet<T>>::approve(RawOrigin::Signed(caller.clone()).into(), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)?;
+	}: transfer_from(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)
 
 	// ReFungible
 	transfer_from_refungible {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_refungible_collection::<T>(caller.clone())?;
 		let recipient: T::AccountId = account("recipient", 0, SEED);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
 		let data = default_re_fungible_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
-		Nft::<T>::approve(RawOrigin::Signed(caller.clone()).into(), recipient.clone(), 2, 1)?;
-
-	}: transfer_from(RawOrigin::Signed(caller.clone()), caller.clone(), recipient.clone(), 2, 1, 1)
-
-	enable_contract_sponsoring {
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-
-	}: enable_contract_sponsoring(RawOrigin::Signed(caller.clone()), caller.clone(), true)
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(caller.clone()), data)?;
+		<Pallet<T>>::approve(RawOrigin::Signed(caller.clone()).into(), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)?;
+	}: transfer_from(RawOrigin::Signed(caller.clone()), T::CrossAccountId::from_sub(caller.clone()), T::CrossAccountId::from_sub(recipient.clone()), 2, 1, 1)
 
 	set_offchain_schema {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let b in 0..OFFCHAIN_SCHEMA_LIMIT;
 
-	}: set_offchain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = create_data(b as usize);
+	}: set_offchain_schema(RawOrigin::Signed(caller.clone()), collection, data)
 
 	set_const_on_chain_schema {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: set_const_on_chain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
+		let b in 0..CONST_ON_CHAIN_SCHEMA_LIMIT;
 
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = create_data(b as usize);
+	}: set_const_on_chain_schema(RawOrigin::Signed(caller.clone()), collection, data)
+
 	set_variable_on_chain_schema {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::ReFungible(3);
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-	}: set_variable_on_chain_schema(RawOrigin::Signed(caller.clone()), 2, [1,2,3].to_vec())
+		let b in 0..VARIABLE_ON_CHAIN_SCHEMA_LIMIT;
 
-	set_variable_meta_data {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let data = default_nft_data();
-		Nft::<T>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, caller.clone(), data)?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = create_data(b as usize);
+	}: set_variable_on_chain_schema(RawOrigin::Signed(caller.clone()), 2, data)
 
-	}: set_variable_meta_data(RawOrigin::Signed(caller.clone()), 2, 1, [1, 2, 3].to_vec())
+	set_variable_meta_data_nft {
+		let b in 0..CUSTOM_DATA_LIMIT;
 
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
+		let data = default_nft_data();
+		<Pallet<T>>::create_item(RawOrigin::Signed(caller.clone()).into(), 2, T::CrossAccountId::from_sub(caller.clone()), data)?;
+		let data = create_data(b as usize);
+	}: set_variable_meta_data(RawOrigin::Signed(caller.clone()), collection, 1, data)
+
 	set_schema_version {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 	}: set_schema_version(RawOrigin::Signed(caller.clone()), 2, SchemaVersion::Unique)
-
-	set_chain_limits {
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		let limits = ChainLimits {
-			collection_numbers_limit: 0,
-			account_token_ownership_limit: 0,
-			collections_admins_limit: 0,
-			custom_data_limit: 0,
-			nft_sponsor_transfer_timeout: 0,
-			fungible_sponsor_transfer_timeout: 0,
-			refungible_sponsor_transfer_timeout: 0
-		};
-	}: set_chain_limits(RawOrigin::Signed(caller.clone()), limits)
-
-	set_contract_sponsoring_rate_limit {
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
-		let block_number: T::BlockNumber = 0.into();
-	}: set_contract_sponsoring_rate_limit(RawOrigin::Signed(caller.clone()), caller.clone(), block_number)
 
 	set_collection_limits{
-		let col_name1: Vec<u16> = "Test1".encode_utf16().collect::<Vec<u16>>();
-		let col_desc1: Vec<u16> = "TestDescription1".encode_utf16().collect::<Vec<u16>>();
-		let token_prefix1: Vec<u8> = b"token_prefix1".to_vec();
-		let mode: CollectionMode = CollectionMode::NFT;
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::create_collection(RawOrigin::Signed(caller.clone()).into(), col_name1.clone(), col_desc1.clone(), token_prefix1.clone(), mode.clone())?;
+		let caller: T::AccountId = account("caller", 0, SEED);
+		let collection = create_nft_collection::<T>(caller.clone())?;
 
 		let cl = CollectionLimits {
 			account_token_ownership_limit: 0,
 			sponsored_data_size: 0,
-			token_limit: 0,
-			sponsor_transfer_timeout: 0
+			token_limit: 1,
+			sponsor_transfer_timeout: 0,
+			owner_can_destroy: true,
+			owner_can_transfer: true,
+			sponsored_data_rate_limit: None,
 		};
-
 	}: set_collection_limits(RawOrigin::Signed(caller.clone()), 2, cl)
-
-	add_to_contract_white_list{
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-	}: add_to_contract_white_list(RawOrigin::Signed(caller.clone()), caller.clone(), caller.clone())
-
-	remove_from_contract_white_list{
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-		Nft::<T>::add_to_contract_white_list(RawOrigin::Signed(caller.clone()).into(), caller.clone(), caller.clone())?;
-	}: remove_from_contract_white_list(RawOrigin::Signed(caller.clone()), caller.clone(), caller.clone())
-
-	toggle_contract_white_list{
-		let caller: T::AccountId = T::AccountId::from(whitelisted_caller());
-	}: toggle_contract_white_list(RawOrigin::Signed(caller.clone()), caller.clone(), true)
-*/
 }

--- a/pallets/nft/src/eth/erc.rs
+++ b/pallets/nft/src/eth/erc.rs
@@ -1,12 +1,16 @@
 use core::char::{decode_utf16, REPLACEMENT_CHARACTER};
-use evm_coder::{ToLog, execution::Result, solidity, solidity_interface, types::*};
+use evm_coder::{ToLog, execution::Result, generate_stubgen, solidity, solidity_interface, types::*};
+use nft_data_structs::{CreateItemData, CreateNftData};
 use core::convert::TryInto;
-use alloc::format;
-use crate::{Allowances, Module, Balance, CollectionHandle, CollectionMode, Config, NftItemList};
-use frame_support::storage::StorageDoubleMap;
+use crate::{
+	Allowances, Module, Balance, CollectionHandle, CollectionMode, Config, NftItemList,
+	ItemListIndex,
+};
+use frame_support::storage::{StorageMap, StorageDoubleMap};
 use pallet_evm::AddressMapping;
+use pallet_evm_coder_substrate::dispatch_to_evm;
 use super::account::CrossAccountId;
-use sp_std::vec::Vec;
+use sp_std::{vec, vec::Vec};
 
 #[solidity_interface(name = "ERC165")]
 impl<T: Config> CollectionHandle<T> {
@@ -42,9 +46,15 @@
 
 #[solidity_interface(name = "ERC721Metadata", inline_is(InlineNameSymbol))]
 impl<T: Config> CollectionHandle<T> {
+	#[solidity(rename_selector = "tokenURI")]
 	fn token_uri(&self, token_id: uint256) -> Result<string> {
-		// TODO: We should standartize url prefix, maybe via offchain schema?
-		Ok(format!("unique.network/{}/{}", self.id, token_id))
+		let token_id: u32 = token_id.try_into().map_err(|_| "token id overflow")?;
+		Ok(string::from_utf8_lossy(
+			&<NftItemList<T>>::get(self.id, token_id)
+				.ok_or("token not found")?
+				.const_data,
+		)
+		.into())
 	}
 }
 
@@ -178,6 +188,93 @@
 	}
 }
 
+#[solidity_interface(name = "ERC721Burnable")]
+impl<T: Config> CollectionHandle<T> {
+	fn burn(&mut self, caller: caller, token_id: uint256) -> Result<void> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let token_id = token_id.try_into().map_err(|_| "amount overflow")?;
+
+		<Module<T>>::burn_item_internal(&caller, &self, token_id, 1).map_err(|_| "burn error")?;
+		Ok(())
+	}
+}
+
+#[derive(ToLog)]
+pub enum ERC721MintableEvents {
+	#[allow(dead_code)]
+	MintingFinished {},
+}
+
+#[solidity_interface(name = "ERC721Mintable", events(ERC721MintableEvents))]
+impl<T: Config> CollectionHandle<T> {
+	fn minting_finished(&self) -> Result<bool> {
+		Ok(false)
+	}
+
+	fn mint(&mut self, caller: caller, to: address, token_id: uint256) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let to = T::CrossAccountId::from_eth(to);
+		let token_id: u32 = token_id.try_into().map_err(|_| "amount overflow")?;
+		if <ItemListIndex>::get(self.id)
+			.checked_add(1)
+			.ok_or("item id overflow")?
+			!= token_id
+		{
+			return Err("item id should be next".into());
+		}
+
+		<Module<T>>::create_item_internal(
+			&caller,
+			&self,
+			&to,
+			CreateItemData::NFT(CreateNftData {
+				const_data: vec![].try_into().unwrap(),
+				variable_data: vec![].try_into().unwrap(),
+			}),
+		)
+		.map_err(|_| "mint error")?;
+		Ok(true)
+	}
+
+	#[solidity(rename_selector = "mintWithTokenURI")]
+	fn mint_with_token_uri(
+		&mut self,
+		caller: caller,
+		to: address,
+		token_id: uint256,
+		token_uri: string,
+	) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let to = T::CrossAccountId::from_eth(to);
+		let token_id: u32 = token_id.try_into().map_err(|_| "amount overflow")?;
+		if <ItemListIndex>::get(self.id)
+			.checked_add(1)
+			.ok_or("item id overflow")?
+			!= token_id
+		{
+			return Err("item id should be next".into());
+		}
+
+		<Module<T>>::create_item_internal(
+			&caller,
+			&self,
+			&to,
+			CreateItemData::NFT(CreateNftData {
+				const_data: Vec::<u8>::from(token_uri)
+					.try_into()
+					.map_err(|_| "token uri is too long")?,
+				variable_data: vec![].try_into().unwrap(),
+			}),
+		)
+		.map_err(|_| "mint error")?;
+		Ok(true)
+	}
+
+	fn finish_minting(&mut self, _caller: caller) -> Result<bool> {
+		Err("not implementable".into())
+	}
+}
+
 #[solidity_interface(name = "ERC721UniqueExtensions")]
 impl<T: Config> CollectionHandle<T> {
 	#[solidity(rename_selector = "transfer")]
@@ -196,6 +293,97 @@
 			.map_err(|_| "transfer error")?;
 		Ok(())
 	}
+
+	fn next_token_id(&self) -> Result<uint256> {
+		Ok(ItemListIndex::get(self.id)
+			.checked_add(1)
+			.ok_or("item id overflow")?
+			.into())
+	}
+
+	fn set_variable_metadata(
+		&mut self,
+		caller: caller,
+		token_id: uint256,
+		data: bytes,
+	) -> Result<void> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let token_id = token_id.try_into().map_err(|_| "token id overflow")?;
+
+		<Module<T>>::set_variable_meta_data_internal(&caller, self, token_id, data)
+			.map_err(dispatch_to_evm::<T>)?;
+		Ok(())
+	}
+
+	fn get_variable_metadata(&self, token_id: uint256) -> Result<bytes> {
+		let token_id = token_id.try_into().map_err(|_| "token id overflow")?;
+
+		<Module<T>>::get_variable_metadata(self, token_id).map_err(dispatch_to_evm::<T>)
+	}
+
+	fn mint_bulk(&mut self, caller: caller, to: address, token_ids: Vec<uint256>) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let to = T::CrossAccountId::from_eth(to);
+		let mut expected_index = <ItemListIndex>::get(self.id)
+			.checked_add(1)
+			.ok_or("item id overflow")?;
+
+		let total_tokens = token_ids.len();
+		for id in token_ids.into_iter() {
+			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;
+			if id != expected_index {
+				return Err("item id should be next".into());
+			}
+			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;
+		}
+
+		let data = (0..total_tokens)
+			.map(|_| {
+				CreateItemData::NFT(CreateNftData {
+					const_data: vec![].try_into().unwrap(),
+					variable_data: vec![].try_into().unwrap(),
+				})
+			})
+			.collect();
+
+		<Module<T>>::create_multiple_items_internal(&caller, self, &to, data)
+			.map_err(dispatch_to_evm::<T>)?;
+		Ok(true)
+	}
+
+	#[solidity(rename_selector = "mintBulkWithTokenURI")]
+	fn mint_bulk_with_token_uri(
+		&mut self,
+		caller: caller,
+		to: address,
+		tokens: Vec<(uint256, string)>,
+	) -> Result<bool> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let to = T::CrossAccountId::from_eth(to);
+		let mut expected_index = <ItemListIndex>::get(self.id)
+			.checked_add(1)
+			.ok_or("item id overflow")?;
+
+		let mut data = Vec::with_capacity(tokens.len());
+		for (id, token_uri) in tokens {
+			let id: u32 = id.try_into().map_err(|_| "token id overflow")?;
+			if id != expected_index {
+				panic!("item id should be next ({}) but got {}", expected_index, id);
+			}
+			expected_index = expected_index.checked_add(1).ok_or("item id overflow")?;
+
+			data.push(CreateItemData::NFT(CreateNftData {
+				const_data: Vec::<u8>::from(token_uri)
+					.try_into()
+					.map_err(|_| "token uri is too long")?,
+				variable_data: vec![].try_into().unwrap(),
+			}));
+		}
+
+		<Module<T>>::create_multiple_items_internal(&caller, self, &to, data)
+			.map_err(dispatch_to_evm::<T>)?;
+		Ok(true)
+	}
 }
 
 #[solidity_interface(
@@ -205,7 +393,9 @@
 		ERC721,
 		ERC721Metadata,
 		ERC721Enumerable,
-		ERC721UniqueExtensions
+		ERC721UniqueExtensions,
+		ERC721Mintable,
+		ERC721Burnable,
 	)
 )]
 impl<T: Config> CollectionHandle<T> {}
@@ -297,3 +487,10 @@
 
 #[solidity_interface(name = "UniqueFungible", is(ERC165, ERC20))]
 impl<T: Config> CollectionHandle<T> {}
+
+// Not a tests, but code generators
+generate_stubgen!(nft_impl, UniqueNFTCall, true);
+generate_stubgen!(nft_iface, UniqueNFTCall, false);
+
+generate_stubgen!(fungible_impl, UniqueFungibleCall, true);
+generate_stubgen!(fungible_iface, UniqueFungibleCall, false);

--- a/pallets/nft/src/eth/mod.rs
+++ b/pallets/nft/src/eth/mod.rs
@@ -96,10 +96,14 @@
 			.and_then(<CollectionById<T>>::get)
 			.map(|collection| {
 				match collection.mode {
-					CollectionMode::NFT => include_bytes!("stubs/ERC721.bin") as &[u8],
-					CollectionMode::Fungible(_) => include_bytes!("stubs/ERC20.bin") as &[u8],
-					CollectionMode::ReFungible => include_bytes!("stubs/ERC1633.bin") as &[u8],
-					CollectionMode::Invalid => include_bytes!("stubs/Invalid.bin") as &[u8],
+					CollectionMode::NFT => include_bytes!("stubs/UniqueNFT.raw") as &[u8],
+					CollectionMode::Fungible(_) => {
+						include_bytes!("stubs/UniqueFungible.raw") as &[u8]
+					}
+					CollectionMode::ReFungible => {
+						include_bytes!("stubs/UniqueRefungible.raw") as &[u8]
+					}
+					CollectionMode::Invalid => include_bytes!("stubs/UniqueInvalid.raw") as &[u8],
 				}
 				.to_owned()
 			})

--- a/pallets/nft/src/eth/sponsoring.rs
+++ b/pallets/nft/src/eth/sponsoring.rs
@@ -1,12 +1,12 @@
 //! Implements EVM sponsoring logic via OnChargeEVMTransaction
 
 use crate::{
-	ChainLimit, Collection, CollectionById, Config, FungibleTransferBasket, NftTransferBasket,
+	Collection, CollectionById, Config, FungibleTransferBasket, NftTransferBasket,
 	eth::{account::EvmBackwardsAddressMapping, map_eth_to_id},
 };
 use evm_coder::{Call, abi::AbiReader};
 use frame_support::{
-	storage::{StorageMap, StorageDoubleMap, StorageValue},
+	storage::{StorageMap, StorageDoubleMap},
 };
 use sp_core::H160;
 use sp_std::prelude::*;
@@ -17,6 +17,7 @@
 };
 use core::convert::TryInto;
 use core::marker::PhantomData;
+use nft_data_structs::{NFT_SPONSOR_TRANSFER_TIMEOUT, FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT};
 
 struct AnyError;
 
@@ -43,7 +44,7 @@
 					let limit: u32 = if collection_limits.sponsor_transfer_timeout > 0 {
 						collection_limits.sponsor_transfer_timeout
 					} else {
-						ChainLimit::get().nft_sponsor_transfer_timeout
+						NFT_SPONSOR_TRANSFER_TIMEOUT
 					};
 
 					let mut sponsor = true;
@@ -74,7 +75,7 @@
 					let limit: u32 = if collection_limits.sponsor_transfer_timeout > 0 {
 						collection_limits.sponsor_transfer_timeout
 					} else {
-						ChainLimit::get().fungible_sponsor_transfer_timeout
+						FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT
 					};
 
 					let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;

--- a/pallets/nft/src/lib.rs
+++ b/pallets/nft/src/lib.rs
@@ -31,15 +31,18 @@
 	StorageValue, transactional,
 };
 
-use frame_system::{self as system, ensure_signed, ensure_root};
+use frame_system::{self as system, ensure_signed};
 use sp_core::H160;
 use sp_std::vec;
-use sp_runtime::sp_std::prelude::Vec;
+use sp_runtime::{DispatchError, sp_std::prelude::Vec};
 use core::ops::{Deref, DerefMut};
 use nft_data_structs::{
 	MAX_DECIMAL_POINTS, MAX_SPONSOR_TIMEOUT, MAX_TOKEN_OWNERSHIP, MAX_REFUNGIBLE_PIECES,
-	AccessMode, ChainLimits, Collection, CreateItemData, CollectionLimits, CollectionId,
-	CollectionMode, TokenId, SchemaVersion, SponsorshipState, Ownership, NftItemType,
+	CUSTOM_DATA_LIMIT, COLLECTION_NUMBER_LIMIT, ACCOUNT_TOKEN_OWNERSHIP_LIMIT,
+	VARIABLE_ON_CHAIN_SCHEMA_LIMIT, CONST_ON_CHAIN_SCHEMA_LIMIT, COLLECTION_ADMINS_LIMIT,
+	OFFCHAIN_SCHEMA_LIMIT, MAX_TOKEN_PREFIX_LENGTH, MAX_COLLECTION_NAME_LENGTH,
+	MAX_COLLECTION_DESCRIPTION_LENGTH, AccessMode, Collection, CreateItemData, CollectionLimits,
+	CollectionId, CollectionMode, TokenId, SchemaVersion, SponsorshipState, Ownership, NftItemType,
 	FungibleItemType, ReFungibleItemType,
 };
 
@@ -49,7 +52,6 @@
 #[cfg(test)]
 mod tests;
 
-mod default_weights;
 mod eth;
 mod sponsorship;
 pub use sponsorship::NftSponsorshipHandler;
@@ -61,39 +63,8 @@
 
 #[cfg(feature = "runtime-benchmarks")]
 mod benchmarking;
-
-pub trait WeightInfo {
-	fn create_collection() -> Weight;
-	fn destroy_collection() -> Weight;
-	fn add_to_white_list() -> Weight;
-	fn remove_from_white_list() -> Weight;
-	fn set_public_access_mode() -> Weight;
-	fn set_mint_permission() -> Weight;
-	fn change_collection_owner() -> Weight;
-	fn add_collection_admin() -> Weight;
-	fn remove_collection_admin() -> Weight;
-	fn set_collection_sponsor() -> Weight;
-	fn confirm_sponsorship() -> Weight;
-	fn remove_collection_sponsor() -> Weight;
-	fn create_item(s: usize) -> Weight;
-	fn burn_item() -> Weight;
-	fn transfer() -> Weight;
-	fn approve() -> Weight;
-	fn transfer_from() -> Weight;
-	fn set_offchain_schema() -> Weight;
-	fn set_const_on_chain_schema() -> Weight;
-	fn set_variable_on_chain_schema() -> Weight;
-	fn set_variable_meta_data() -> Weight;
-	fn enable_contract_sponsoring() -> Weight;
-	fn set_schema_version() -> Weight;
-	fn set_chain_limits() -> Weight;
-	fn set_contract_sponsoring_rate_limit() -> Weight;
-	fn set_variable_meta_data_sponsoring_rate_limit() -> Weight;
-	fn toggle_contract_white_list() -> Weight;
-	fn add_to_contract_white_list() -> Weight;
-	fn remove_from_contract_white_list() -> Weight;
-	fn set_collection_limits() -> Weight;
-}
+pub mod weights;
+use weights::WeightInfo;
 
 decl_error! {
 	/// Error for non-fungible-token module.
@@ -176,6 +147,8 @@
 		OutOfGas,
 		/// Collection settings not allowing items transferring
 		TransferNotAllowed,
+		/// Can't transfer tokens to ethereum zero address
+		AddressIsZero,
 	}
 }
 
@@ -202,9 +175,16 @@
 	pub fn log(&self, log: impl evm_coder::ToLog) -> DispatchResult {
 		self.recorder.log_sub(log)
 	}
+	#[allow(dead_code)]
 	fn consume_gas(&self, gas: u64) -> DispatchResult {
 		self.recorder.consume_gas_sub(gas)
 	}
+	fn consume_sload(&self) -> DispatchResult {
+		self.recorder.consume_sload_sub()
+	}
+	fn consume_sstore(&self) -> DispatchResult {
+		self.recorder.consume_sstore_sub()
+	}
 	pub fn submit_logs(self) -> DispatchResult {
 		self.recorder.submit_logs()
 	}
@@ -245,6 +225,44 @@
 	type TreasuryAccountId: Get<Self::AccountId>;
 }
 
+type SelfWeightOf<T> = <T as Config>::WeightInfo;
+
+trait WeightInfoHelpers: WeightInfo {
+	fn transfer() -> Weight {
+		Self::transfer_nft()
+			.max(Self::transfer_fungible())
+			.max(Self::transfer_refungible())
+	}
+	fn transfer_from() -> Weight {
+		Self::transfer_from_nft()
+			.max(Self::transfer_from_fungible())
+			.max(Self::transfer_from_refungible())
+	}
+	fn approve() -> Weight {
+		// TODO: refungible, fungible
+		Self::approve_nft()
+	}
+	fn set_variable_meta_data(data: u32) -> Weight {
+		// TODO: refungible
+		Self::set_variable_meta_data_nft(data)
+	}
+	fn create_item(data: u32) -> Weight {
+		Self::create_item_nft(data)
+			.max(Self::create_item_fungible())
+			.max(Self::create_item_refungible(data))
+	}
+	fn create_multiple_items(amount: u32) -> Weight {
+		Self::create_multiple_items_nft(amount)
+			.max(Self::create_multiple_items_fungible(amount))
+			.max(Self::create_multiple_items_refungible(amount))
+	}
+	fn burn_item() -> Weight {
+		// TODO: refungible, fungible
+		Self::burn_item_nft()
+	}
+}
+impl<T: WeightInfo> WeightInfoHelpers for T {}
+
 // # Used definitions
 //
 // ## User control levels
@@ -280,10 +298,6 @@
 		ItemListIndex: map hasher(blake2_128_concat) CollectionId => TokenId;
 		//#endregion
 
-		//#region Chain limits struct
-		pub ChainLimit get(fn chain_limit) config(): ChainLimits;
-		//#endregion
-
 		//#region Bound counters
 		/// Amount of collections destroyed, used for total amount tracking with
 		/// CreatedCollectionCount
@@ -435,6 +449,7 @@
 		origin: T::Origin
 	{
 		fn deposit_event() = default;
+		const CollectionAdminsLimit: u64 = COLLECTION_ADMINS_LIMIT;
 		type Error = Error<T>;
 
 		fn on_initialize(_now: T::BlockNumber) -> Weight {
@@ -457,7 +472,7 @@
 		///
 		/// * mode: [CollectionMode] collection type and type dependent data.
 		// returns collection ID
-		#[weight = <T as Config>::WeightInfo::create_collection()]
+		#[weight = <SelfWeightOf<T>>::create_collection()]
 		#[transactional]
 		pub fn create_collection(origin,
 								 collection_name: Vec<u16>,
@@ -486,19 +501,17 @@
 				_ => 0
 			};
 
-			let chain_limit = ChainLimit::get();
-
 			let created_count = CreatedCollectionCount::get();
 			let destroyed_count = DestroyedCollectionCount::get();
 
 			// bound Total number of collections
-			ensure!(created_count - destroyed_count < chain_limit.collection_numbers_limit, Error::<T>::TotalCollectionsLimitExceeded);
+			ensure!(created_count - destroyed_count < COLLECTION_NUMBER_LIMIT, Error::<T>::TotalCollectionsLimitExceeded);
 
 			// check params
 			ensure!(decimal_points <= MAX_DECIMAL_POINTS, Error::<T>::CollectionDecimalPointLimitExceeded);
-			ensure!(collection_name.len() <= 64, Error::<T>::CollectionNameLimitExceeded);
-			ensure!(collection_description.len() <= 256, Error::<T>::CollectionDescriptionLimitExceeded);
-			ensure!(token_prefix.len() <= 16, Error::<T>::CollectionTokenPrefixLimitExceeded);
+			ensure!(collection_name.len() <= MAX_COLLECTION_NAME_LENGTH, Error::<T>::CollectionNameLimitExceeded);
+			ensure!(collection_description.len() <= MAX_COLLECTION_DESCRIPTION_LENGTH, Error::<T>::CollectionDescriptionLimitExceeded);
+			ensure!(token_prefix.len() <= MAX_TOKEN_PREFIX_LENGTH, Error::<T>::CollectionTokenPrefixLimitExceeded);
 
 			// Generate next collection ID
 			let next_id = created_count
@@ -508,7 +521,7 @@
 			CreatedCollectionCount::put(next_id);
 
 			let limits = CollectionLimits {
-				sponsored_data_size: chain_limit.custom_data_limit,
+				sponsored_data_size: CUSTOM_DATA_LIMIT,
 				..Default::default()
 			};
 
@@ -549,7 +562,7 @@
 		/// # Arguments
 		///
 		/// * collection_id: collection to destroy.
-		#[weight = <T as Config>::WeightInfo::destroy_collection()]
+		#[weight = <SelfWeightOf<T>>::destroy_collection()]
 		#[transactional]
 		pub fn destroy_collection(origin, collection_id: CollectionId) -> DispatchResult {
 
@@ -597,7 +610,7 @@
 		/// * collection_id.
 		///
 		/// * address.
-		#[weight = <T as Config>::WeightInfo::add_to_white_list()]
+		#[weight = <SelfWeightOf<T>>::add_to_white_list()]
 		#[transactional]
 		pub fn add_to_white_list(origin, collection_id: CollectionId, address: T::CrossAccountId) -> DispatchResult{
 
@@ -626,7 +639,7 @@
 		/// * collection_id.
 		///
 		/// * address.
-		#[weight = <T as Config>::WeightInfo::remove_from_white_list()]
+		#[weight = <SelfWeightOf<T>>::remove_from_white_list()]
 		#[transactional]
 		pub fn remove_from_white_list(origin, collection_id: CollectionId, address: T::CrossAccountId) -> DispatchResult{
 
@@ -654,7 +667,7 @@
 		/// * collection_id.
 		///
 		/// * mode: [AccessMode]
-		#[weight = <T as Config>::WeightInfo::set_public_access_mode()]
+		#[weight = <SelfWeightOf<T>>::set_public_access_mode()]
 		#[transactional]
 		pub fn set_public_access_mode(origin, collection_id: CollectionId, mode: AccessMode) -> DispatchResult
 		{
@@ -679,7 +692,7 @@
 		/// * collection_id.
 		///
 		/// * mint_permission: Boolean parameter. If True, allows minting to Anyone with conditions above.
-		#[weight = <T as Config>::WeightInfo::set_mint_permission()]
+		#[weight = <SelfWeightOf<T>>::set_mint_permission()]
 		#[transactional]
 		pub fn set_mint_permission(origin, collection_id: CollectionId, mint_permission: bool) -> DispatchResult
 		{
@@ -702,7 +715,7 @@
 		/// * collection_id.
 		///
 		/// * new_owner.
-		#[weight = <T as Config>::WeightInfo::change_collection_owner()]
+		#[weight = <SelfWeightOf<T>>::change_collection_owner()]
 		#[transactional]
 		pub fn change_collection_owner(origin, collection_id: CollectionId, new_owner: T::AccountId) -> DispatchResult {
 
@@ -726,7 +739,7 @@
 		/// * collection_id: ID of the Collection to add admin for.
 		///
 		/// * new_admin_id: Address of new admin to add.
-		#[weight = <T as Config>::WeightInfo::add_collection_admin()]
+		#[weight = <SelfWeightOf<T>>::add_collection_admin()]
 		#[transactional]
 		pub fn add_collection_admin(origin, collection_id: CollectionId, new_admin_id: T::CrossAccountId) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -737,8 +750,7 @@
 			match admin_arr.binary_search(&new_admin_id) {
 				Ok(_) => {},
 				Err(idx) => {
-					let limits = ChainLimit::get();
-					ensure!(admin_arr.len() < limits.collections_admins_limit as usize, Error::<T>::CollectionAdminsLimitExceeded);
+					ensure!(admin_arr.len() < COLLECTION_ADMINS_LIMIT as usize, Error::<T>::CollectionAdminsLimitExceeded);
 					admin_arr.insert(idx, new_admin_id);
 					<AdminList<T>>::insert(collection_id, admin_arr);
 				}
@@ -758,7 +770,7 @@
 		/// * collection_id: ID of the Collection to remove admin for.
 		///
 		/// * account_id: Address of admin to remove.
-		#[weight = <T as Config>::WeightInfo::remove_collection_admin()]
+		#[weight = <SelfWeightOf<T>>::remove_collection_admin()]
 		#[transactional]
 		pub fn remove_collection_admin(origin, collection_id: CollectionId, account_id: T::CrossAccountId) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -782,7 +794,7 @@
 		/// * collection_id.
 		///
 		/// * new_sponsor.
-		#[weight = <T as Config>::WeightInfo::set_collection_sponsor()]
+		#[weight = <SelfWeightOf<T>>::set_collection_sponsor()]
 		#[transactional]
 		pub fn set_collection_sponsor(origin, collection_id: CollectionId, new_sponsor: T::AccountId) -> DispatchResult {
 			let sender = ensure_signed(origin)?;
@@ -800,7 +812,7 @@
 		/// # Arguments
 		///
 		/// * collection_id.
-		#[weight = <T as Config>::WeightInfo::confirm_sponsorship()]
+		#[weight = <SelfWeightOf<T>>::confirm_sponsorship()]
 		#[transactional]
 		pub fn confirm_sponsorship(origin, collection_id: CollectionId) -> DispatchResult {
 			let sender = ensure_signed(origin)?;
@@ -824,7 +836,7 @@
 		/// # Arguments
 		///
 		/// * collection_id.
-		#[weight = <T as Config>::WeightInfo::remove_collection_sponsor()]
+		#[weight = <SelfWeightOf<T>>::remove_collection_sponsor()]
 		#[transactional]
 		pub fn remove_collection_sponsor(origin, collection_id: CollectionId) -> DispatchResult {
 			let sender = ensure_signed(origin)?;
@@ -860,7 +872,7 @@
 		// .saturating_add(RocksDbWeight::get().reads(10 as Weight))
 		// .saturating_add(RocksDbWeight::get().writes(8 as Weight))]
 
-		#[weight = <T as Config>::WeightInfo::create_item(data.data_size())]
+		#[weight = <SelfWeightOf<T>>::create_item(data.data_size() as u32)]
 		#[transactional]
 		pub fn create_item(origin, collection_id: CollectionId, owner: T::CrossAccountId, data: CreateItemData) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -889,9 +901,7 @@
 		/// * itemsData: Array items properties. Each property is an array of bytes itself, see [create_item].
 		///
 		/// * owner: Address, initial owner of the NFT.
-		#[weight = <T as Config>::WeightInfo::create_item(items_data.iter()
-							   .map(|data| { data.data_size() })
-							   .sum())]
+		#[weight = <SelfWeightOf<T>>::create_multiple_items(items_data.len() as u32)]
 		#[transactional]
 		pub fn create_multiple_items(origin, collection_id: CollectionId, owner: T::CrossAccountId, items_data: Vec<CreateItemData>) -> DispatchResult {
 
@@ -917,7 +927,7 @@
 		/// * collection_id: ID of the collection.
 		///
 		/// * value: New flag value.
-		#[weight = <T as Config>::WeightInfo::burn_item()]
+		#[weight = <SelfWeightOf<T>>::set_transfers_enabled_flag()]
 		#[transactional]
 		pub fn set_transfers_enabled_flag(origin, collection_id: CollectionId, value: bool) -> DispatchResult {
 
@@ -943,7 +953,7 @@
 		/// * collection_id: ID of the collection.
 		///
 		/// * item_id: ID of NFT to burn.
-		#[weight = <T as Config>::WeightInfo::burn_item()]
+		#[weight = <SelfWeightOf<T>>::burn_item()]
 		#[transactional]
 		pub fn burn_item(origin, collection_id: CollectionId, item_id: TokenId, value: u128) -> DispatchResult {
 
@@ -978,7 +988,7 @@
 		///     * Non-Fungible Mode: Ignored
 		///     * Fungible Mode: Must specify transferred amount
 		///     * Re-Fungible Mode: Must specify transferred portion (between 0 and 1)
-		#[weight = <T as Config>::WeightInfo::transfer()]
+		#[weight = <SelfWeightOf<T>>::transfer()]
 		#[transactional]
 		pub fn transfer(origin, recipient: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, value: u128) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -1004,7 +1014,7 @@
 		/// * collection_id.
 		///
 		/// * item_id: ID of the item.
-		#[weight = <T as Config>::WeightInfo::approve()]
+		#[weight = <SelfWeightOf<T>>::approve()]
 		#[transactional]
 		pub fn approve(origin, spender: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, amount: u128) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -1034,7 +1044,7 @@
 		/// * item_id: ID of the item.
 		///
 		/// * value: Amount to transfer.
-		#[weight = <T as Config>::WeightInfo::transfer_from()]
+		#[weight = <SelfWeightOf<T>>::transfer_from()]
 		#[transactional]
 		pub fn transfer_from(origin, from: T::CrossAccountId, recipient: T::CrossAccountId, collection_id: CollectionId, item_id: TokenId, value: u128 ) -> DispatchResult {
 			let sender = T::CrossAccountId::from_sub(ensure_signed(origin)?);
@@ -1069,7 +1079,7 @@
 		/// * collection_id.
 		///
 		/// * schema: String representing the offchain data schema.
-		#[weight = <T as Config>::WeightInfo::set_variable_meta_data()]
+		#[weight = <SelfWeightOf<T>>::set_variable_meta_data(data.len() as u32)]
 		#[transactional]
 		pub fn set_variable_meta_data (
 			origin,
@@ -1100,7 +1110,7 @@
 		/// * collection_id.
 		///
 		/// * schema: SchemaVersion: enum
-		#[weight = <T as Config>::WeightInfo::set_schema_version()]
+		#[weight = <SelfWeightOf<T>>::set_schema_version()]
 		#[transactional]
 		pub fn set_schema_version(
 			origin,
@@ -1126,7 +1136,7 @@
 		/// * collection_id.
 		///
 		/// * schema: String representing the offchain data schema.
-		#[weight = <T as Config>::WeightInfo::set_offchain_schema()]
+		#[weight = <SelfWeightOf<T>>::set_offchain_schema(schema.len() as u32)]
 		#[transactional]
 		pub fn set_offchain_schema(
 			origin,
@@ -1138,7 +1148,7 @@
 			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;
 
 			// check schema limit
-			ensure!(schema.len() as u32 <= ChainLimit::get().offchain_schema_limit, "");
+			ensure!(schema.len() as u32 <= OFFCHAIN_SCHEMA_LIMIT, "");
 
 			target_collection.offchain_schema = schema;
 			target_collection.save()
@@ -1156,7 +1166,7 @@
 		/// * collection_id.
 		///
 		/// * schema: String representing the const on-chain data schema.
-		#[weight = <T as Config>::WeightInfo::set_const_on_chain_schema()]
+		#[weight = <SelfWeightOf<T>>::set_const_on_chain_schema(schema.len() as u32)]
 		#[transactional]
 		pub fn set_const_on_chain_schema (
 			origin,
@@ -1168,7 +1178,7 @@
 			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;
 
 			// check schema limit
-			ensure!(schema.len() as u32 <= ChainLimit::get().const_on_chain_schema_limit, "");
+			ensure!(schema.len() as u32 <= CONST_ON_CHAIN_SCHEMA_LIMIT, "");
 
 			target_collection.const_on_chain_schema = schema;
 			target_collection.save()
@@ -1186,7 +1196,7 @@
 		/// * collection_id.
 		///
 		/// * schema: String representing the variable on-chain data schema.
-		#[weight = <T as Config>::WeightInfo::set_const_on_chain_schema()]
+		#[weight = <SelfWeightOf<T>>::set_const_on_chain_schema(schema.len() as u32)]
 		#[transactional]
 		pub fn set_variable_on_chain_schema (
 			origin,
@@ -1198,28 +1208,13 @@
 			Self::check_owner_or_admin_permissions(&target_collection, &sender)?;
 
 			// check schema limit
-			ensure!(schema.len() as u32 <= ChainLimit::get().variable_on_chain_schema_limit, "");
+			ensure!(schema.len() as u32 <= VARIABLE_ON_CHAIN_SCHEMA_LIMIT, "");
 
 			target_collection.variable_on_chain_schema = schema;
 			target_collection.save()
 		}
 
-		// Sudo permissions function
-		#[weight = <T as Config>::WeightInfo::set_chain_limits()]
-		#[transactional]
-		pub fn set_chain_limits(
-			origin,
-			limits: ChainLimits
-		) -> DispatchResult {
-
-			#[cfg(not(feature = "runtime-benchmarks"))]
-			ensure_root(origin)?;
-
-			<ChainLimit>::put(limits);
-			Ok(())
-		}
-
-		#[weight = <T as Config>::WeightInfo::set_collection_limits()]
+		#[weight = <SelfWeightOf<T>>::set_collection_limits()]
 		#[transactional]
 		pub fn set_collection_limits(
 			origin,
@@ -1230,12 +1225,11 @@
 			let mut target_collection = Self::get_collection(collection_id)?;
 			Self::check_owner_permissions(&target_collection, sender.as_sub())?;
 			let old_limits = &target_collection.limits;
-			let chain_limits = ChainLimit::get();
 
 			// collection bounds
 			ensure!(new_limits.sponsor_transfer_timeout <= MAX_SPONSOR_TIMEOUT &&
 				new_limits.account_token_ownership_limit <= MAX_TOKEN_OWNERSHIP &&
-				new_limits.sponsored_data_size <= chain_limits.custom_data_limit,
+				new_limits.sponsored_data_size <= CUSTOM_DATA_LIMIT,
 				Error::<T>::CollectionLimitBoundsExceeded);
 
 			// token_limit   check  prev
@@ -1262,6 +1256,11 @@
 		owner: &T::CrossAccountId,
 		data: CreateItemData,
 	) -> DispatchResult {
+		ensure!(
+			owner != &T::CrossAccountId::from_eth(H160([0; 20])),
+			Error::<T>::AddressIsZero
+		);
+
 		Self::can_create_items_in_collection(collection, sender, owner, 1)?;
 		Self::validate_create_item_args(collection, &data)?;
 		Self::create_item_no_validation(collection, owner, data)?;
@@ -1276,14 +1275,18 @@
 		item_id: TokenId,
 		value: u128,
 	) -> DispatchResult {
-		target_collection.consume_gas(2000000)?;
+		ensure!(
+			recipient != &T::CrossAccountId::from_eth(H160([0; 20])),
+			Error::<T>::AddressIsZero
+		);
+
 		// Limits check
 		Self::is_correct_transfer(target_collection, recipient)?;
 
 		// Transfer permissions check
 		ensure!(
-			Self::is_item_owner(sender, target_collection, item_id)
-				|| Self::is_owner_or_admin_permissions(target_collection, sender),
+			Self::is_item_owner(sender, target_collection, item_id)?
+				|| Self::is_owner_or_admin_permissions(target_collection, sender)?,
 			Error::<T>::NoPermission
 		);
 
@@ -1330,16 +1333,15 @@
 		item_id: TokenId,
 		amount: u128,
 	) -> DispatchResult {
-		collection.consume_gas(2000000)?;
 		Self::token_exists(collection, item_id)?;
 
 		// Transfer permissions check
 		let bypasses_limits = collection.limits.owner_can_transfer
-			&& Self::is_owner_or_admin_permissions(collection, sender);
+			&& Self::is_owner_or_admin_permissions(collection, sender)?;
 
 		let allowance_limit = if bypasses_limits {
 			None
-		} else if let Some(amount) = Self::owned_amount(sender, collection, item_id) {
+		} else if let Some(amount) = Self::owned_amount(sender, collection, item_id)? {
 			Some(amount)
 		} else {
 			fail!(Error::<T>::NoPermission);
@@ -1350,6 +1352,7 @@
 			Self::check_white_list(collection, spender)?;
 		}
 
+		collection.consume_sload()?;
 		let allowance: u128 = amount
 			.checked_add(<Allowances<T>>::get(
 				collection.id,
@@ -1359,6 +1362,7 @@
 		if let Some(limit) = allowance_limit {
 			ensure!(limit >= allowance, Error::<T>::TokenValueTooLow);
 		}
+		collection.consume_sstore()?;
 		<Allowances<T>>::insert(
 			collection.id,
 			(item_id, sender.as_sub(), spender.as_sub()),
@@ -1401,8 +1405,13 @@
 		item_id: TokenId,
 		amount: u128,
 	) -> DispatchResult {
-		collection.consume_gas(2000000)?;
+		if sender == from {
+			// Transfer by `from`, because it is either equal to sender, or derived from him
+			return Self::transfer_internal(from, recipient, collection, item_id, amount);
+		}
+
 		// Check approval
+		collection.consume_sload()?;
 		let approval: u128 =
 			<Allowances<T>>::get(collection.id, (item_id, from.as_sub(), sender.as_sub()));
 
@@ -1413,7 +1422,7 @@
 		ensure!(
 			approval >= amount
 				|| (collection.limits.owner_can_transfer
-					&& Self::is_owner_or_admin_permissions(collection, sender)),
+					&& Self::is_owner_or_admin_permissions(collection, sender)?),
 			Error::<T>::NoPermission
 		);
 
@@ -1424,6 +1433,7 @@
 
 		// Reduce approval by transferred amount or remove if remaining approval drops to 0
 		let allowance = approval.saturating_sub(amount);
+		collection.consume_sstore()?;
 		if allowance > 0 {
 			<Allowances<T>>::insert(
 				collection.id,
@@ -1471,14 +1481,14 @@
 		Self::token_exists(collection, item_id)?;
 
 		ensure!(
-			ChainLimit::get().custom_data_limit >= data.len() as u32,
+			CUSTOM_DATA_LIMIT >= data.len() as u32,
 			Error::<T>::TokenVariableDataLimitExceeded
 		);
 
 		// Modify permissions check
 		ensure!(
-			Self::is_item_owner(sender, collection, item_id)
-				|| Self::is_owner_or_admin_permissions(collection, sender),
+			Self::is_item_owner(sender, collection, item_id)?
+				|| Self::is_owner_or_admin_permissions(collection, sender)?,
 			Error::<T>::NoPermission
 		);
 
@@ -1494,6 +1504,25 @@
 		Ok(())
 	}
 
+	pub fn get_variable_metadata(
+		collection: &CollectionHandle<T>,
+		item_id: TokenId,
+	) -> Result<Vec<u8>, DispatchError> {
+		Ok(match collection.mode {
+			CollectionMode::NFT => {
+				<NftItemList<T>>::get(collection.id, item_id)
+					.ok_or(Error::<T>::TokenNotFound)?
+					.variable_data
+			}
+			CollectionMode::ReFungible => {
+				<ReFungibleItemList<T>>::get(collection.id, item_id)
+					.ok_or(Error::<T>::TokenNotFound)?
+					.variable_data
+			}
+			_ => fail!(Error::<T>::UnexpectedCollectionType),
+		})
+	}
+
 	pub fn create_multiple_items_internal(
 		sender: &T::CrossAccountId,
 		collection: &CollectionHandle<T>,
@@ -1519,9 +1548,9 @@
 		value: u128,
 	) -> DispatchResult {
 		ensure!(
-			Self::is_item_owner(sender, collection, item_id)
+			Self::is_item_owner(sender, collection, item_id)?
 				|| (collection.limits.owner_can_transfer
-					&& Self::is_owner_or_admin_permissions(collection, sender)),
+					&& Self::is_owner_or_admin_permissions(collection, sender)?),
 			Error::<T>::NoPermission
 		);
 
@@ -1563,6 +1592,7 @@
 		let collection_id = collection.id;
 
 		// check token limit and account token limit
+		collection.consume_sload()?;
 		let account_items: u32 =
 			<AddressTokens<T>>::get(collection_id, recipient.as_sub()).len() as u32;
 		ensure!(
@@ -1601,7 +1631,7 @@
 			Error::<T>::AccountTokenLimitExceeded
 		);
 
-		if !Self::is_owner_or_admin_permissions(collection, sender) {
+		if !Self::is_owner_or_admin_permissions(collection, sender)? {
 			ensure!(collection.mint_mode, Error::<T>::PublicMintingNotAllowed);
 			Self::check_white_list(collection, owner)?;
 			Self::check_white_list(collection, sender)?;
@@ -1616,38 +1646,17 @@
 	) -> DispatchResult {
 		match target_collection.mode {
 			CollectionMode::NFT => {
-				if let CreateItemData::NFT(data) = data {
-					// check sizes
-					ensure!(
-						ChainLimit::get().custom_data_limit >= data.const_data.len() as u32,
-						Error::<T>::TokenConstDataLimitExceeded
-					);
-					ensure!(
-						ChainLimit::get().custom_data_limit >= data.variable_data.len() as u32,
-						Error::<T>::TokenVariableDataLimitExceeded
-					);
-				} else {
+				if !matches!(data, CreateItemData::NFT(_)) {
 					fail!(Error::<T>::NotNftDataUsedToMintNftCollectionToken);
 				}
 			}
 			CollectionMode::Fungible(_) => {
-				if let CreateItemData::Fungible(_) = data {
-				} else {
+				if !matches!(data, CreateItemData::Fungible(_)) {
 					fail!(Error::<T>::NotFungibleDataUsedToMintFungibleCollectionToken);
 				}
 			}
 			CollectionMode::ReFungible => {
 				if let CreateItemData::ReFungible(data) = data {
-					// check sizes
-					ensure!(
-						ChainLimit::get().custom_data_limit >= data.const_data.len() as u32,
-						Error::<T>::TokenConstDataLimitExceeded
-					);
-					ensure!(
-						ChainLimit::get().custom_data_limit >= data.variable_data.len() as u32,
-						Error::<T>::TokenVariableDataLimitExceeded
-					);
-
 					// Check refungibility limits
 					ensure!(
 						data.pieces <= MAX_REFUNGIBLE_PIECES,
@@ -1675,8 +1684,8 @@
 			CreateItemData::NFT(data) => {
 				let item = NftItemType {
 					owner: owner.clone(),
-					const_data: data.const_data,
-					variable_data: data.variable_data,
+					const_data: data.const_data.into_inner(),
+					variable_data: data.variable_data.into_inner(),
 				};
 
 				Self::add_nft_item(collection, item)?;
@@ -1692,8 +1701,8 @@
 
 				let item = ReFungibleItemType {
 					owner: owner_list,
-					const_data: data.const_data,
-					variable_data: data.variable_data,
+					const_data: data.const_data.into_inner(),
+					variable_data: data.variable_data.into_inner(),
 				};
 
 				Self::add_refungible_item(collection, item)?;
@@ -1711,20 +1720,29 @@
 		let collection_id = collection.id;
 
 		// Does new owner already have an account?
+		collection.consume_sload()?;
 		let balance: u128 = <FungibleItemList<T>>::get(collection_id, owner.as_sub()).value;
 
 		// Mint
 		let item = FungibleItemType {
 			value: balance.checked_add(value).ok_or(Error::<T>::NumOverflow)?,
 		};
+		collection.consume_sstore()?;
 		<FungibleItemList<T>>::insert(collection_id, owner.as_sub(), item);
 
 		// Update balance
+		collection.consume_sload()?;
 		let new_balance = <Balance<T>>::get(collection_id, owner.as_sub())
 			.checked_add(value)
 			.ok_or(Error::<T>::NumOverflow)?;
+		collection.consume_sstore()?;
 		<Balance<T>>::insert(collection_id, owner.as_sub(), new_balance);
 
+		collection.log(ERC20Events::Transfer {
+			from: H160::default(),
+			to: *owner.as_eth(),
+			value: value.into(),
+		})?;
 		Self::deposit_event(RawEvent::ItemCreated(collection_id, 0, owner.clone()));
 		Ok(())
 	}
@@ -1746,7 +1764,7 @@
 		let value = item_owner.fraction;
 		let owner = item_owner.owner.clone();
 
-		Self::add_token_index(collection_id, current_index, &owner)?;
+		Self::add_token_index(collection, current_index, &owner)?;
 
 		<ItemListIndex>::insert(collection_id, current_index);
 		<ReFungibleItemList<T>>::insert(collection_id, current_index, itemcopy);
@@ -1772,7 +1790,7 @@
 			.ok_or(Error::<T>::NumOverflow)?;
 
 		let item_owner = item.owner.clone();
-		Self::add_token_index(collection_id, current_index, &item.owner)?;
+		Self::add_token_index(collection, current_index, &item.owner)?;
 
 		<ItemListIndex>::insert(collection_id, current_index);
 		<NftItemList<T>>::insert(collection_id, current_index, item);
@@ -1810,7 +1828,7 @@
 			.iter()
 			.find(|&i| i.owner == *owner)
 			.ok_or(Error::<T>::TokenNotFound)?;
-		Self::remove_token_index(collection_id, item_id, owner)?;
+		Self::remove_token_index(collection, item_id, owner)?;
 
 		// update balance
 		let new_balance = <Balance<T>>::get(collection_id, rft_balance.owner.as_sub())
@@ -1843,7 +1861,7 @@
 
 		let item =
 			<NftItemList<T>>::get(collection_id, item_id).ok_or(Error::<T>::TokenNotFound)?;
-		Self::remove_token_index(collection_id, item_id, &item.owner)?;
+		Self::remove_token_index(collection, item_id, &item.owner)?;
 
 		// update balance
 		let new_balance = <Balance<T>>::get(collection_id, item.owner.as_sub())
@@ -1853,6 +1871,11 @@
 		<NftItemList<T>>::remove(collection_id, item_id);
 		<VariableMetaDataBasket<T>>::remove(collection_id, item_id);
 
+		collection.log(ERC721Events::Transfer {
+			from: *item.owner.as_eth(),
+			to: H160::default(),
+			token_id: item_id.into(),
+		})?;
 		Self::deposit_event(RawEvent::ItemDestroyed(collection.id, item_id));
 		Ok(())
 	}
@@ -1909,9 +1932,10 @@
 	fn is_owner_or_admin_permissions(
 		collection: &CollectionHandle<T>,
 		subject: &T::CrossAccountId,
-	) -> bool {
-		*subject.as_sub() == collection.owner
-			|| <AdminList<T>>::get(collection.id).contains(subject)
+	) -> Result<bool, DispatchError> {
+		collection.consume_sload()?;
+		Ok(*subject.as_sub() == collection.owner
+			|| <AdminList<T>>::get(collection.id).contains(subject))
 	}
 
 	fn check_owner_or_admin_permissions(
@@ -1919,7 +1943,7 @@
 		subject: &T::CrossAccountId,
 	) -> DispatchResult {
 		ensure!(
-			Self::is_owner_or_admin_permissions(collection, subject),
+			Self::is_owner_or_admin_permissions(collection, subject)?,
 			Error::<T>::NoPermission
 		);
 
@@ -1928,6 +1952,15 @@
 
 	fn owned_amount(
 		subject: &T::CrossAccountId,
+		collection: &CollectionHandle<T>,
+		item_id: TokenId,
+	) -> Result<Option<u128>, DispatchError> {
+		collection.consume_sload()?;
+		Ok(Self::owned_amount_unchecked(subject, collection, item_id))
+	}
+
+	fn owned_amount_unchecked(
+		subject: &T::CrossAccountId,
 		target_collection: &CollectionHandle<T>,
 		item_id: TokenId,
 	) -> Option<u128> {
@@ -1953,25 +1986,22 @@
 		subject: &T::CrossAccountId,
 		target_collection: &CollectionHandle<T>,
 		item_id: TokenId,
-	) -> bool {
-		match target_collection.mode {
+	) -> Result<bool, DispatchError> {
+		Ok(match target_collection.mode {
 			CollectionMode::Fungible(_) => true,
-			_ => Self::owned_amount(subject, target_collection, item_id).is_some(),
-		}
+			_ => Self::owned_amount(subject, target_collection, item_id)?.is_some(),
+		})
 	}
 
 	fn check_white_list(
 		collection: &CollectionHandle<T>,
 		address: &T::CrossAccountId,
 	) -> DispatchResult {
-		let collection_id = collection.id;
-
-		let mes = Error::<T>::AddresNotInWhiteList;
+		collection.consume_sload()?;
 		ensure!(
-			<WhiteList<T>>::contains_key(collection_id, address.as_sub()),
-			mes
+			<WhiteList<T>>::contains_key(collection.id, address.as_sub()),
+			Error::<T>::AddresNotInWhiteList,
 		);
-
 		Ok(())
 	}
 
@@ -2000,22 +2030,39 @@
 	) -> DispatchResult {
 		let collection_id = collection.id;
 
+		collection.consume_sload()?;
+		collection.consume_sload()?;
+		let mut recipient_balance = <FungibleItemList<T>>::get(collection_id, recipient.as_sub());
 		let mut balance = <FungibleItemList<T>>::get(collection_id, owner.as_sub());
-		ensure!(balance.value >= value, Error::<T>::TokenValueTooLow);
 
-		// Send balance to recipient (updates balanceOf of recipient)
-		Self::add_fungible_item(collection, recipient, value)?;
+		recipient_balance.value = recipient_balance
+			.value
+			.checked_add(value)
+			.ok_or(Error::<T>::NumOverflow)?;
+		balance.value = balance
+			.value
+			.checked_sub(value)
+			.ok_or(Error::<T>::TokenValueTooLow)?;
 
-		// update balanceOf of sender
-		<Balance<T>>::insert(collection_id, owner.as_sub(), balance.value - value);
+		// update balanceOf
+		collection.consume_sstore()?;
+		collection.consume_sstore()?;
+		if balance.value != 0 {
+			<Balance<T>>::insert(collection_id, owner.as_sub(), balance.value);
+		} else {
+			<Balance<T>>::remove(collection_id, owner.as_sub());
+		}
+		<Balance<T>>::insert(collection_id, recipient.as_sub(), recipient_balance.value);
 
 		// Reduce or remove sender
-		if balance.value == value {
-			<FungibleItemList<T>>::remove(collection_id, owner.as_sub());
-		} else {
-			balance.value -= value;
+		collection.consume_sstore()?;
+		collection.consume_sstore()?;
+		if balance.value != 0 {
 			<FungibleItemList<T>>::insert(collection_id, owner.as_sub(), balance);
+		} else {
+			<FungibleItemList<T>>::remove(collection_id, owner.as_sub());
 		}
+		<FungibleItemList<T>>::insert(collection_id, recipient.as_sub(), recipient_balance);
 
 		collection.log(ERC20Events::Transfer {
 			from: *owner.as_eth(),
@@ -2041,6 +2088,7 @@
 		new_owner: T::CrossAccountId,
 	) -> DispatchResult {
 		let collection_id = collection.id;
+		collection.consume_sload()?;
 		let full_item = <ReFungibleItemList<T>>::get(collection_id, item_id)
 			.ok_or(Error::<T>::TokenNotFound)?;
 
@@ -2053,15 +2101,19 @@
 
 		ensure!(amount >= value, Error::<T>::TokenValueTooLow);
 
+		collection.consume_sload()?;
 		// update balance
 		let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.as_sub())
 			.checked_sub(value)
 			.ok_or(Error::<T>::NumOverflow)?;
+		collection.consume_sstore()?;
 		<Balance<T>>::insert(collection_id, item.owner.as_sub(), balance_old_owner);
 
+		collection.consume_sload()?;
 		let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.as_sub())
 			.checked_add(value)
 			.ok_or(Error::<T>::NumOverflow)?;
+		collection.consume_sstore()?;
 		<Balance<T>>::insert(collection_id, new_owner.as_sub(), balance_new_owner);
 
 		let old_owner = item.owner.clone();
@@ -2078,10 +2130,11 @@
 				.find(|i| i.owner == owner)
 				.expect("old owner does present in refungible")
 				.owner = new_owner.clone();
+			collection.consume_sstore()?;
 			<ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);
 
 			// update index collection
-			Self::move_token_index(collection_id, item_id, &old_owner, &new_owner)?;
+			Self::move_token_index(collection, item_id, &old_owner, &new_owner)?;
 		} else {
 			new_full_item
 				.owner
@@ -2105,9 +2158,10 @@
 					owner: new_owner.clone(),
 					fraction: value,
 				});
-				Self::add_token_index(collection_id, item_id, &new_owner)?;
+				Self::add_token_index(collection, item_id, &new_owner)?;
 			}
 
+			collection.consume_sstore()?;
 			<ReFungibleItemList<T>>::insert(collection_id, item_id, new_full_item);
 		}
 
@@ -2129,29 +2183,35 @@
 		new_owner: T::CrossAccountId,
 	) -> DispatchResult {
 		let collection_id = collection.id;
+		collection.consume_sload()?;
 		let mut item =
 			<NftItemList<T>>::get(collection_id, item_id).ok_or(Error::<T>::TokenNotFound)?;
 
 		ensure!(sender == item.owner, Error::<T>::MustBeTokenOwner);
 
+		collection.consume_sload()?;
 		// update balance
 		let balance_old_owner = <Balance<T>>::get(collection_id, item.owner.as_sub())
 			.checked_sub(1)
 			.ok_or(Error::<T>::NumOverflow)?;
+		collection.consume_sstore()?;
 		<Balance<T>>::insert(collection_id, item.owner.as_sub(), balance_old_owner);
 
+		collection.consume_sload()?;
 		let balance_new_owner = <Balance<T>>::get(collection_id, new_owner.as_sub())
 			.checked_add(1)
 			.ok_or(Error::<T>::NumOverflow)?;
+		collection.consume_sstore()?;
 		<Balance<T>>::insert(collection_id, new_owner.as_sub(), balance_new_owner);
 
 		// change owner
 		let old_owner = item.owner.clone();
 		item.owner = new_owner.clone();
+		collection.consume_sstore()?;
 		<NftItemList<T>>::insert(collection_id, item_id, item);
 
 		// update index collection
-		Self::move_token_index(collection_id, item_id, &old_owner, &new_owner)?;
+		Self::move_token_index(collection, item_id, &old_owner, &new_owner)?;
 
 		collection.log(ERC721Events::Transfer {
 			from: *sender.as_eth(),
@@ -2231,7 +2291,12 @@
 	fn init_nft_token(collection_id: CollectionId, item: &NftItemType<T::CrossAccountId>) {
 		let current_index = <ItemListIndex>::get(collection_id).checked_add(1).unwrap();
 
-		Self::add_token_index(collection_id, current_index, &item.owner).unwrap();
+		Self::add_token_index(
+			&CollectionHandle::get(collection_id).unwrap(),
+			current_index,
+			&item.owner,
+		)
+		.unwrap();
 
 		<ItemListIndex>::insert(collection_id, current_index);
 
@@ -2250,7 +2315,12 @@
 	) {
 		let current_index = <ItemListIndex>::get(collection_id).checked_add(1).unwrap();
 
-		Self::add_token_index(collection_id, current_index, owner).unwrap();
+		Self::add_token_index(
+			&CollectionHandle::get(collection_id).unwrap(),
+			current_index,
+			owner,
+		)
+		.unwrap();
 
 		<ItemListIndex>::insert(collection_id, current_index);
 
@@ -2271,7 +2341,12 @@
 		let value = item.owner.first().unwrap().fraction;
 		let owner = item.owner.first().unwrap().owner.clone();
 
-		Self::add_token_index(collection_id, current_index, &owner).unwrap();
+		Self::add_token_index(
+			&CollectionHandle::get(collection_id).unwrap(),
+			current_index,
+			&owner,
+		)
+		.unwrap();
 
 		<ItemListIndex>::insert(collection_id, current_index);
 
@@ -2283,51 +2358,61 @@
 	}
 
 	fn add_token_index(
-		collection_id: CollectionId,
+		collection: &CollectionHandle<T>,
 		item_index: TokenId,
 		owner: &T::CrossAccountId,
 	) -> DispatchResult {
 		// add to account limit
+		collection.consume_sload()?;
 		if <AccountItemCount<T>>::contains_key(owner.as_sub()) {
 			// bound Owned tokens by a single address
+			collection.consume_sload()?;
 			let count = <AccountItemCount<T>>::get(owner.as_sub());
 			ensure!(
-				count < ChainLimit::get().account_token_ownership_limit,
+				count < ACCOUNT_TOKEN_OWNERSHIP_LIMIT,
 				Error::<T>::AddressOwnershipLimitExceeded
 			);
 
+			collection.consume_sstore()?;
 			<AccountItemCount<T>>::insert(
 				owner.as_sub(),
 				count.checked_add(1).ok_or(Error::<T>::NumOverflow)?,
 			);
 		} else {
+			collection.consume_sstore()?;
 			<AccountItemCount<T>>::insert(owner.as_sub(), 1);
 		}
 
-		let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.as_sub());
+		collection.consume_sload()?;
+		let list_exists = <AddressTokens<T>>::contains_key(collection.id, owner.as_sub());
 		if list_exists {
-			let mut list = <AddressTokens<T>>::get(collection_id, owner.as_sub());
+			collection.consume_sload()?;
+			let mut list = <AddressTokens<T>>::get(collection.id, owner.as_sub());
 			let item_contains = list.contains(&item_index.clone());
 
 			if !item_contains {
 				list.push(item_index);
 			}
 
-			<AddressTokens<T>>::insert(collection_id, owner.as_sub(), list);
+			collection.consume_sstore()?;
+			<AddressTokens<T>>::insert(collection.id, owner.as_sub(), list);
 		} else {
 			let itm = vec![item_index];
-			<AddressTokens<T>>::insert(collection_id, owner.as_sub(), itm);
+			collection.consume_sstore()?;
+			<AddressTokens<T>>::insert(collection.id, owner.as_sub(), itm);
 		}
 
 		Ok(())
 	}
 
 	fn remove_token_index(
-		collection_id: CollectionId,
+		collection: &CollectionHandle<T>,
 		item_index: TokenId,
 		owner: &T::CrossAccountId,
 	) -> DispatchResult {
 		// update counter
+		collection.consume_sload()?;
+		collection.consume_sstore()?;
 		<AccountItemCount<T>>::insert(
 			owner.as_sub(),
 			<AccountItemCount<T>>::get(owner.as_sub())
@@ -2335,14 +2420,17 @@
 				.ok_or(Error::<T>::NumOverflow)?,
 		);
 
-		let list_exists = <AddressTokens<T>>::contains_key(collection_id, owner.as_sub());
+		collection.consume_sload()?;
+		let list_exists = <AddressTokens<T>>::contains_key(collection.id, owner.as_sub());
 		if list_exists {
-			let mut list = <AddressTokens<T>>::get(collection_id, owner.as_sub());
+			collection.consume_sload()?;
+			let mut list = <AddressTokens<T>>::get(collection.id, owner.as_sub());
 			let item_contains = list.contains(&item_index.clone());
 
 			if item_contains {
 				list.retain(|&item| item != item_index);
-				<AddressTokens<T>>::insert(collection_id, owner.as_sub(), list);
+				collection.consume_sstore()?;
+				<AddressTokens<T>>::insert(collection.id, owner.as_sub(), list);
 			}
 		}
 
@@ -2350,13 +2438,13 @@
 	}
 
 	fn move_token_index(
-		collection_id: CollectionId,
+		collection: &CollectionHandle<T>,
 		item_index: TokenId,
 		old_owner: &T::CrossAccountId,
 		new_owner: &T::CrossAccountId,
 	) -> DispatchResult {
-		Self::remove_token_index(collection_id, item_index, old_owner)?;
-		Self::add_token_index(collection_id, item_index, new_owner)?;
+		Self::remove_token_index(collection, item_index, old_owner)?;
+		Self::add_token_index(collection, item_index, new_owner)?;
 
 		Ok(())
 	}

--- a/pallets/nft/src/mock.rs
+++ b/pallets/nft/src/mock.rs
@@ -129,8 +129,11 @@
 	fn as_sub(&self) -> &u64 {
 		&self.0
 	}
-	fn from_eth(_eth: sp_core::H160) -> Self {
-		unimplemented!()
+	fn from_eth(eth: sp_core::H160) -> Self {
+		let mut sub_raw = [0; 8];
+		sub_raw.copy_from_slice(&eth.0[0..8]);
+		let sub = u64::from_be_bytes(sub_raw);
+		Self(sub, eth)
 	}
 	fn as_eth(&self) -> &sp_core::H160 {
 		&self.1

--- a/pallets/nft/src/sponsorship.rs
+++ b/pallets/nft/src/sponsorship.rs
@@ -1,15 +1,18 @@
 use crate::{
 	Config, Call, CollectionById, CreateItemBasket, VariableMetaDataBasket,
-	ReFungibleTransferBasket, FungibleTransferBasket, NftTransferBasket, ChainLimit,
-	CreateItemData, CollectionMode,
+	ReFungibleTransferBasket, FungibleTransferBasket, NftTransferBasket, CreateItemData,
+	CollectionMode,
 };
 use core::marker::PhantomData;
 use up_sponsorship::SponsorshipHandler;
 use frame_support::{
-	traits::IsSubType,
-	storage::{StorageMap, StorageDoubleMap, StorageValue},
+	traits::{IsSubType},
+	storage::{StorageMap, StorageDoubleMap},
+};
+use nft_data_structs::{
+	TokenId, CollectionId, NFT_SPONSOR_TRANSFER_TIMEOUT, REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,
+	FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT,
 };
-use nft_data_structs::{TokenId, CollectionId};
 
 pub struct NftSponsorshipHandler<T>(PhantomData<T>);
 impl<T: Config> NftSponsorshipHandler<T> {
@@ -47,7 +50,6 @@
 		item_id: &TokenId,
 	) -> Option<T::AccountId> {
 		let collection = CollectionById::<T>::get(collection_id)?;
-		let limits = ChainLimit::get();
 
 		let mut sponsor_transfer = false;
 		if collection.sponsorship.confirmed() {
@@ -62,7 +64,7 @@
 					let limit: u32 = if collection_limits.sponsor_transfer_timeout > 0 {
 						collection_limits.sponsor_transfer_timeout
 					} else {
-						limits.nft_sponsor_transfer_timeout
+						NFT_SPONSOR_TRANSFER_TIMEOUT
 					};
 
 					let mut sponsored = true;
@@ -84,7 +86,7 @@
 					let limit: u32 = if collection_limits.sponsor_transfer_timeout > 0 {
 						collection_limits.sponsor_transfer_timeout
 					} else {
-						limits.fungible_sponsor_transfer_timeout
+						FUNGIBLE_SPONSOR_TRANSFER_TIMEOUT
 					};
 
 					let block_number = <frame_system::Pallet<T>>::block_number() as T::BlockNumber;
@@ -107,7 +109,7 @@
 					let limit: u32 = if collection_limits.sponsor_transfer_timeout > 0 {
 						collection_limits.sponsor_transfer_timeout
 					} else {
-						limits.refungible_sponsor_transfer_timeout
+						REFUNGIBLE_SPONSOR_TRANSFER_TIMEOUT
 					};
 
 					let mut sponsored = true;

--- a/pallets/nft/src/tests.rs
+++ b/pallets/nft/src/tests.rs
@@ -1,40 +1,18 @@
 // Tests to be written here
 use super::*;
 use crate::mock::*;
-use crate::{AccessMode, CollectionMode, Ownership, ChainLimits, CreateItemData};
+use crate::{AccessMode, CollectionMode, Ownership, CreateItemData};
 use nft_data_structs::{
 	CreateNftData, CreateFungibleData, CreateReFungibleData, CollectionId, TokenId,
 	MAX_DECIMAL_POINTS,
 };
 use frame_support::{assert_noop, assert_ok};
-use frame_system::{RawOrigin};
-
-fn default_collection_numbers_limit() -> u32 {
-	10
-}
-
-fn default_limits() {
-	assert_ok!(TemplateModule::set_chain_limits(
-		RawOrigin::Root.into(),
-		ChainLimits {
-			collection_numbers_limit: default_collection_numbers_limit(),
-			account_token_ownership_limit: 10,
-			collections_admins_limit: 5,
-			custom_data_limit: 2048,
-			nft_sponsor_transfer_timeout: 15,
-			fungible_sponsor_transfer_timeout: 15,
-			refungible_sponsor_transfer_timeout: 15,
-			const_on_chain_schema_limit: 1024,
-			offchain_schema_limit: 1024,
-			variable_on_chain_schema_limit: 1024,
-		}
-	));
-}
+use sp_std::convert::TryInto;
 
 fn default_nft_data() -> CreateNftData {
 	CreateNftData {
-		const_data: vec![1, 2, 3],
-		variable_data: vec![3, 2, 1],
+		const_data: vec![1, 2, 3].try_into().unwrap(),
+		variable_data: vec![3, 2, 1].try_into().unwrap(),
 	}
 }
 
@@ -44,8 +22,8 @@
 
 fn default_re_fungible_data() -> CreateReFungibleData {
 	CreateReFungibleData {
-		const_data: vec![1, 2, 3],
-		variable_data: vec![3, 2, 1],
+		const_data: vec![1, 2, 3].try_into().unwrap(),
+		variable_data: vec![3, 2, 1].try_into().unwrap(),
 		pieces: 1023,
 	}
 }
@@ -112,7 +90,6 @@
 #[test]
 fn set_version_schema() {
 	new_test_ext().execute_with(|| {
-		default_limits();
 		let origin1 = Origin::signed(1);
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
@@ -133,8 +110,6 @@
 #[test]
 fn create_fungible_collection_fails_with_large_decimal_numbers() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let col_name1: Vec<u16> = "Test1\0".encode_utf16().collect::<Vec<u16>>();
 		let col_desc1: Vec<u16> = "TestDescription1\0".encode_utf16().collect::<Vec<u16>>();
 		let token_prefix1: Vec<u8> = b"token_prefix1\0".to_vec();
@@ -156,14 +131,13 @@
 #[test]
 fn create_nft_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
 		create_test_item(collection_id, &data.clone().into());
 		let item = TemplateModule::nft_item_id(collection_id, 1).unwrap();
-		assert_eq!(item.const_data, data.const_data);
-		assert_eq!(item.variable_data, data.variable_data);
+		assert_eq!(item.const_data, data.const_data.into_inner());
+		assert_eq!(item.variable_data, data.variable_data.into_inner());
 	});
 }
 
@@ -172,8 +146,6 @@
 #[test]
 fn create_nft_multiple_items() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -190,10 +162,10 @@
 				.map(|d| { d.into() })
 				.collect()
 		));
-		for (index, data) in items_data.iter().enumerate() {
+		for (index, data) in items_data.into_iter().enumerate() {
 			let item = TemplateModule::nft_item_id(1, (index + 1) as TokenId).unwrap();
-			assert_eq!(item.const_data.to_vec(), data.const_data);
-			assert_eq!(item.variable_data.to_vec(), data.variable_data);
+			assert_eq!(item.const_data.to_vec(), data.const_data.into_inner());
+			assert_eq!(item.variable_data.to_vec(), data.variable_data.into_inner());
 		}
 	});
 }
@@ -201,14 +173,13 @@
 #[test]
 fn create_refungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let data = default_re_fungible_data();
 		create_test_item(collection_id, &data.clone().into());
 		let item = TemplateModule::refungible_item_id(collection_id, 1).unwrap();
-		assert_eq!(item.const_data, data.const_data);
-		assert_eq!(item.variable_data, data.variable_data);
+		assert_eq!(item.const_data, data.const_data.into_inner());
+		assert_eq!(item.variable_data, data.variable_data.into_inner());
 		assert_eq!(
 			item.owner[0],
 			Ownership {
@@ -222,8 +193,6 @@
 #[test]
 fn create_multiple_refungible_items() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let origin1 = Origin::signed(1);
@@ -244,10 +213,10 @@
 				.map(|d| { d.into() })
 				.collect()
 		));
-		for (index, data) in items_data.iter().enumerate() {
+		for (index, data) in items_data.into_iter().enumerate() {
 			let item = TemplateModule::refungible_item_id(1, (index + 1) as TokenId).unwrap();
-			assert_eq!(item.const_data.to_vec(), data.const_data);
-			assert_eq!(item.variable_data.to_vec(), data.variable_data);
+			assert_eq!(item.const_data.to_vec(), data.const_data.into_inner());
+			assert_eq!(item.variable_data.to_vec(), data.variable_data.into_inner());
 			assert_eq!(
 				item.owner[0],
 				Ownership {
@@ -262,8 +231,6 @@
 #[test]
 fn create_fungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::Fungible(3), 1);
 
 		let data = default_fungible_data();
@@ -302,8 +269,6 @@
 #[test]
 fn transfer_fungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::Fungible(3), 1);
 
 		let origin1 = Origin::signed(1);
@@ -344,8 +309,6 @@
 #[test]
 fn transfer_refungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let data = default_re_fungible_data();
@@ -355,8 +318,8 @@
 		let origin2 = Origin::signed(2);
 		{
 			let item = TemplateModule::refungible_item_id(collection_id, 1).unwrap();
-			assert_eq!(item.const_data, data.const_data);
-			assert_eq!(item.variable_data, data.variable_data);
+			assert_eq!(item.const_data, data.const_data.into_inner());
+			assert_eq!(item.variable_data, data.variable_data.into_inner());
 			assert_eq!(
 				item.owner[0],
 				Ownership {
@@ -441,8 +404,6 @@
 #[test]
 fn transfer_nft_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -464,8 +425,6 @@
 #[test]
 fn nft_approve_and_transfer_from() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -503,8 +462,6 @@
 #[test]
 fn nft_approve_and_transfer_from_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -514,8 +471,8 @@
 		create_test_item(collection_id, &data.clone().into());
 
 		assert_eq!(
-			TemplateModule::nft_item_id(1, 1).unwrap().const_data,
-			data.const_data
+			&TemplateModule::nft_item_id(1, 1).unwrap().const_data,
+			&data.const_data.into_inner()
 		);
 		assert_eq!(TemplateModule::balance_count(1, 1), 1);
 		assert_eq!(TemplateModule::address_tokens(1, 1), [1]);
@@ -573,8 +530,6 @@
 #[test]
 fn refungible_approve_and_transfer_from() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let origin1 = Origin::signed(1);
@@ -636,8 +591,6 @@
 #[test]
 fn fungible_approve_and_transfer_from() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::Fungible(3), 1);
 
 		let data = default_fungible_data();
@@ -710,8 +663,6 @@
 #[test]
 fn change_collection_owner() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -730,8 +681,6 @@
 #[test]
 fn destroy_collection() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -742,8 +691,6 @@
 #[test]
 fn burn_nft_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -773,8 +720,6 @@
 #[test]
 fn burn_fungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::Fungible(3), 1);
 
 		let origin1 = Origin::signed(1);
@@ -804,8 +749,6 @@
 #[test]
 fn burn_refungible_item() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 		let origin1 = Origin::signed(1);
 
@@ -851,8 +794,6 @@
 #[test]
 fn add_collection_admin() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection1_id = create_test_collection_for_owner(&CollectionMode::NFT, 1, 1);
 		create_test_collection_for_owner(&CollectionMode::NFT, 2, 2);
 		create_test_collection_for_owner(&CollectionMode::NFT, 3, 3);
@@ -879,8 +820,6 @@
 #[test]
 fn remove_collection_admin() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection1_id = create_test_collection_for_owner(&CollectionMode::NFT, 1, 1);
 		create_test_collection_for_owner(&CollectionMode::NFT, 2, 2);
 		create_test_collection_for_owner(&CollectionMode::NFT, 3, 3);
@@ -916,8 +855,6 @@
 #[test]
 fn balance_of() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let nft_collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let fungible_collection_id = create_test_collection(&CollectionMode::Fungible(3), 2);
 		let re_fungible_collection_id = create_test_collection(&CollectionMode::ReFungible, 3);
@@ -969,8 +906,6 @@
 #[test]
 fn approve() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -987,8 +922,6 @@
 #[test]
 fn transfer_from() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 		let origin2 = Origin::signed(2);
@@ -1051,8 +984,6 @@
 #[test]
 fn owner_can_add_address_to_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1068,8 +999,6 @@
 #[test]
 fn admin_can_add_address_to_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 		let origin2 = Origin::signed(2);
@@ -1091,8 +1020,6 @@
 #[test]
 fn nonprivileged_user_cannot_add_address_to_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin2 = Origin::signed(2);
@@ -1106,8 +1033,6 @@
 #[test]
 fn nobody_can_add_address_to_white_list_of_nonexisting_collection() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let origin1 = Origin::signed(1);
 
 		assert_noop!(
@@ -1120,8 +1045,6 @@
 #[test]
 fn nobody_can_add_address_to_white_list_of_deleted_collection() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1140,8 +1063,6 @@
 #[test]
 fn address_is_already_added_to_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 
@@ -1162,8 +1083,6 @@
 #[test]
 fn owner_can_remove_address_from_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1184,8 +1103,6 @@
 #[test]
 fn admin_can_remove_address_from_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 		let origin2 = Origin::signed(2);
@@ -1213,8 +1130,6 @@
 #[test]
 fn nonprivileged_user_cannot_remove_address_from_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 		let origin2 = Origin::signed(2);
@@ -1235,7 +1150,6 @@
 #[test]
 fn nobody_can_remove_address_from_white_list_of_nonexisting_collection() {
 	new_test_ext().execute_with(|| {
-		default_limits();
 		let origin1 = Origin::signed(1);
 
 		assert_noop!(
@@ -1248,8 +1162,6 @@
 #[test]
 fn nobody_can_remove_address_from_white_list_of_deleted_collection() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 		let origin2 = Origin::signed(2);
@@ -1272,8 +1184,6 @@
 #[test]
 fn address_is_already_removed_from_white_list() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 
@@ -1300,8 +1210,6 @@
 #[test]
 fn white_list_test_1() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1330,8 +1238,6 @@
 #[test]
 fn white_list_test_2() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 
@@ -1381,8 +1287,6 @@
 #[test]
 fn white_list_test_3() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1411,8 +1315,6 @@
 #[test]
 fn white_list_test_4() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1463,8 +1365,6 @@
 #[test]
 fn white_list_test_5() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1488,8 +1388,6 @@
 #[test]
 fn white_list_test_6() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1516,8 +1414,6 @@
 #[test]
 fn white_list_test_7() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -1548,8 +1444,6 @@
 #[test]
 fn white_list_test_8() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -1598,8 +1492,6 @@
 #[test]
 fn white_list_test_9() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 		let origin1 = Origin::signed(1);
 
@@ -1623,8 +1515,6 @@
 #[test]
 fn white_list_test_10() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1660,8 +1550,6 @@
 #[test]
 fn white_list_test_11() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1694,8 +1582,6 @@
 #[test]
 fn white_list_test_12() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1723,8 +1609,6 @@
 #[test]
 fn white_list_test_13() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1749,8 +1633,6 @@
 #[test]
 fn white_list_test_14() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1786,8 +1668,6 @@
 #[test]
 fn white_list_test_15() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1815,8 +1695,6 @@
 #[test]
 fn white_list_test_16() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1851,8 +1729,6 @@
 #[test]
 fn total_number_collections_bound() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		create_test_collection(&CollectionMode::NFT, 1);
 	});
 }
@@ -1861,11 +1737,9 @@
 #[test]
 fn total_number_collections_bound_neg() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let origin1 = Origin::signed(1);
 
-		for i in 0..default_collection_numbers_limit() {
+		for i in 0..COLLECTION_NUMBER_LIMIT {
 			create_test_collection(&CollectionMode::NFT, i + 1);
 		}
 
@@ -1891,8 +1765,6 @@
 #[test]
 fn owned_tokens_bound() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let data = default_nft_data();
@@ -1905,28 +1777,16 @@
 #[test]
 fn owned_tokens_bound_neg() {
 	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 1,
-				collections_admins_limit: 5,
-				custom_data_limit: 2048,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
+
+		for _ in 0..ACCOUNT_TOKEN_OWNERSHIP_LIMIT {
+			let data = default_nft_data();
+			create_test_item(collection_id, &data.clone().into());
+		}
+
 		let data = default_nft_data();
-		create_test_item(collection_id, &data.clone().into());
-
 		assert_noop!(
 			TemplateModule::create_item(origin1, 1, account(1), data.into()),
 			Error::<Test>::AddressOwnershipLimitExceeded
@@ -1938,22 +1798,6 @@
 #[test]
 fn collection_admins_bound() {
 	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 2,
-				custom_data_limit: 2048,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -1975,184 +1819,32 @@
 #[test]
 fn collection_admins_bound_neg() {
 	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 1,
-				collections_admins_limit: 1,
-				custom_data_limit: 2048,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
 
-		assert_ok!(TemplateModule::add_collection_admin(
-			origin1.clone(),
-			collection_id,
-			account(2)
-		));
+		for i in 0..COLLECTION_ADMINS_LIMIT {
+			assert_ok!(TemplateModule::add_collection_admin(
+				origin1.clone(),
+				collection_id,
+				account(2 + i)
+			));
+		}
 		assert_noop!(
-			TemplateModule::add_collection_admin(origin1, collection_id, account(3)),
+			TemplateModule::add_collection_admin(
+				origin1,
+				collection_id,
+				account(3 + COLLECTION_ADMINS_LIMIT)
+			),
 			Error::<Test>::CollectionAdminsLimitExceeded
-		);
-	});
-}
-
-// NFT custom data size. Negative test const_data.
-#[test]
-fn custom_data_size_nft_const_data_bound_neg() {
-	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 2,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
-		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
-
-		let origin1 = Origin::signed(1);
-		let too_big_const_data = CreateItemData::NFT(CreateNftData {
-			const_data: vec![1, 2, 3, 4],
-			variable_data: vec![],
-		});
-
-		assert_noop!(
-			TemplateModule::create_item(origin1, collection_id, account(1), too_big_const_data),
-			Error::<Test>::TokenConstDataLimitExceeded
-		);
-	});
-}
-
-// NFT custom data size. Negative test variable_data.
-#[test]
-fn custom_data_size_nft_variable_data_bound_neg() {
-	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 2,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
-		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
-
-		let origin1 = Origin::signed(1);
-		let too_big_const_data = CreateItemData::NFT(CreateNftData {
-			const_data: vec![],
-			variable_data: vec![1, 2, 3, 4],
-		});
-
-		assert_noop!(
-			TemplateModule::create_item(origin1, collection_id, account(1), too_big_const_data),
-			Error::<Test>::TokenVariableDataLimitExceeded
-		);
-	});
-}
-
-// Re fungible custom data size. Negative test const_data.
-#[test]
-fn custom_data_size_re_fungible_const_data_bound_neg() {
-	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 2,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
-		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
-
-		let origin1 = Origin::signed(1);
-		let too_big_const_data = CreateItemData::NFT(CreateNftData {
-			const_data: vec![1, 2, 3, 4],
-			variable_data: vec![],
-		});
-
-		assert_noop!(
-			TemplateModule::create_item(origin1, collection_id, account(1), too_big_const_data),
-			Error::<Test>::TokenConstDataLimitExceeded
 		);
 	});
 }
-
-// Re fungible custom data size. Negative test variable_data.
-#[test]
-fn custom_data_size_re_fungible_variable_data_bound_neg() {
-	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: 10,
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 2,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
-		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
-
-		let origin1 = Origin::signed(1);
-		let too_big_const_data = CreateItemData::NFT(CreateNftData {
-			const_data: vec![],
-			variable_data: vec![1, 2, 3, 4],
-		});
-
-		assert_noop!(
-			TemplateModule::create_item(origin1, collection_id, account(1), too_big_const_data),
-			Error::<Test>::TokenVariableDataLimitExceeded
-		);
-	});
-}
 // #endregion
 
 #[test]
 fn set_const_on_chain_schema() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2180,8 +1872,6 @@
 #[test]
 fn set_variable_on_chain_schema() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2209,8 +1899,6 @@
 #[test]
 fn set_variable_meta_data_on_nft_token_stores_variable_meta_data() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2218,7 +1906,7 @@
 		let data = default_nft_data();
 		create_test_item(1, &data.into());
 
-		let variable_data = b"test set_variable_meta_data method.".to_vec();
+		let variable_data = b"test data".to_vec();
 		assert_ok!(TemplateModule::set_variable_meta_data(
 			origin1,
 			collection_id,
@@ -2238,8 +1926,6 @@
 #[test]
 fn set_variable_meta_data_on_re_fungible_token_stores_variable_meta_data() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2247,7 +1933,7 @@
 		let data = default_re_fungible_data();
 		create_test_item(1, &data.into());
 
-		let variable_data = b"test set_variable_meta_data method.".to_vec();
+		let variable_data = b"test data".to_vec();
 		assert_ok!(TemplateModule::set_variable_meta_data(
 			origin1,
 			collection_id,
@@ -2267,8 +1953,6 @@
 #[test]
 fn set_variable_meta_data_on_fungible_token_fails() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let collection_id = create_test_collection(&CollectionMode::Fungible(3), 1);
 
 		let origin1 = Origin::signed(1);
@@ -2276,7 +1960,7 @@
 		let data = default_fungible_data();
 		create_test_item(1, &data.into());
 
-		let variable_data = b"test set_variable_meta_data method.".to_vec();
+		let variable_data = b"test data".to_vec();
 		assert_noop!(
 			TemplateModule::set_variable_meta_data(origin1, collection_id, 1, variable_data),
 			Error::<Test>::CantStoreMetadataInFungibleTokens
@@ -2287,22 +1971,6 @@
 #[test]
 fn set_variable_meta_data_on_nft_token_fails_for_big_data() {
 	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: default_collection_numbers_limit(),
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 10,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2321,22 +1989,6 @@
 #[test]
 fn set_variable_meta_data_on_re_fungible_token_fails_for_big_data() {
 	new_test_ext().execute_with(|| {
-		assert_ok!(TemplateModule::set_chain_limits(
-			RawOrigin::Root.into(),
-			ChainLimits {
-				collection_numbers_limit: default_collection_numbers_limit(),
-				account_token_ownership_limit: 10,
-				collections_admins_limit: 5,
-				custom_data_limit: 10,
-				nft_sponsor_transfer_timeout: 15,
-				fungible_sponsor_transfer_timeout: 15,
-				refungible_sponsor_transfer_timeout: 15,
-				const_on_chain_schema_limit: 1024,
-				offchain_schema_limit: 1024,
-				variable_on_chain_schema_limit: 1024,
-			}
-		));
-
 		let collection_id = create_test_collection(&CollectionMode::ReFungible, 1);
 
 		let origin1 = Origin::signed(1);
@@ -2355,8 +2007,6 @@
 #[test]
 fn collection_transfer_flag_works() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let origin1 = Origin::signed(1);
 
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);
@@ -2382,8 +2032,6 @@
 #[test]
 fn collection_transfer_flag_works_neg() {
 	new_test_ext().execute_with(|| {
-		default_limits();
-
 		let origin1 = Origin::signed(1);
 
 		let collection_id = create_test_collection(&CollectionMode::NFT, 1);