123# NFT Parachain45## Project Description67The NFT Pallet is the core of NFT functionality. Like ERC-721 standard in Ethereum ecosystem, this pallet provides the basement for creating collections of unique non-divisible things, also called Non Fungible Tokens (NFTs), minting NFT of a given Collection, and managing their ownership.89The pallet also enables storing NFT properties. Though (according to ERC-721) NFT properties belong to logic of a concrete application that operates a Collection, so purposefully the NFT Tracking Module does not have any knowledge about properties except their byte size leaving application logic out to be controlled by Smart Contracts.1011The NFT Chain also provides:1213* Smart Contracts Pallet and example smart contract that interacts with NFT Runtime14* ERC-1155 Functionality (currently PoC as Re-Fungible tokens, i.e. items that are still unique, but that can be split between multiple users)15* Variety of economic options for dapp producers to choose from to create freemium games and other ways to attract users. As a step one, we implemented an economic model when a collection sponsor can be set to pay for collection Transfer transactions.1617Wider NFT Ecosystem:18(Most of it was also developed during Hackusama)19* [SubstraPunks Game hosted on IPFS](https://github.com/usetech-llc/substrapunks)20* [NFT Wallet and UI](https://uniqueapps.usetech.com/#/nft)21* [NFT Asset for Unity Framework](https://github.com/usetech-llc/nft_unity)2223Please see our [walk-thorugh instructions](demo/hackusama_walk_through.md) to try everything out!2425## Hackusama Update2627During the Kusama Hackaphon the following changes were made:28* Enabled Smart Contracts Pallet29* Enabled integration between Smart Contracts and NFT Pallet (required special edition of RC4 Substrate version)30* Fixed misc. bugs in NFT Pallet31* Deployed NFT TestNet. Public node available at wss://unique.usetech.com, custom UI types - see below in this README.32* New Features:33 * Re-Fungible Token Mode34 * Off-Chain Schema to store token image URLs35 * Alternative economic model36 * White Lists and Public Mint Permission37* Use example: [SubstraPunks Game](https://github.com/usetech-llc/substrapunks), fully hosted on IPFS and NFT Testnet Blockchain.3839## Application Development4041If you are building an application that operates NFT tokens, use [this document](doc/application_development.md).4243## Building4445Building NFT chain requires special versions of Rust and toolchain. We don't use the most recent versions of everything so that we can keep the builds stable.46471. Install Rust:4849```bash50curl https://sh.rustup.rs -sSf | sh51sudo apt-get install libssl-dev pkg-config libclang-dev clang52```53542. Remove all installed toolchains with `rustup toolchain list` and `rustup toolchain uninstall <toolchain>`.55563. Install Rust Toolchain 1.44.0:5758```bash59rustup install 1.44.060```61624. Make it default (actual toochain version may be different, so do a `rustup toolchain list` first)63```bash64rustup toolchain list65rustup default 1.44.0-x86_64-unknown-linux-gnu66```67685. Install nightly toolchain and add wasm target for it:6970```bash71rustup toolchain install nightly-2020-05-0172rustup target add wasm32-unknown-unknown --toolchain nightly-2020-05-01-x86_64-unknown-linux-gnu73```74756. Build:76```bash77cargo build78```7980## Run8182You can start a development chain with:8384```bash85cargo run -- --dev86```8788Detailed logs may be shown by running the node with the following environment variables set: `RUST_LOG=debug RUST_BACKTRACE=1 cargo run -- --dev`.8990If you want to see the multi-node consensus algorithm in action locally, then you can create a local testnet with two validator nodes for Alice and Bob, who are the initial authorities of the genesis chain that have been endowed with testnet units. Give each node a name and expose them so they are listed on the Polkadot [telemetry site](https://telemetry.polkadot.io/#/Local%20Testnet). You'll need two terminal windows open.9192We'll start Alice's substrate node first on default TCP port 30333 with her chain database stored locally at `/tmp/alice`. The bootnode ID of her node is `QmQZ8TjTqeDj3ciwr93EJ95hxfDsb9pEYDizUAbWpigtQN`, which is generated from the `--node-key` value that we specify below:9394```bash95cargo run -- \96 --base-path /tmp/alice \97 --chain=local \98 --alice \99 --node-key 0000000000000000000000000000000000000000000000000000000000000001 \100 --telemetry-url ws://telemetry.polkadot.io:1024 \101 --validator102```103104In the second terminal, we'll start Bob's substrate node on a different TCP port of 30334, and with his chain database stored locally at `/tmp/bob`. We'll specify a value for the `--bootnodes` option that will connect his node to Alice's bootnode ID on TCP port 30333:105106```bash107cargo run -- \108 --base-path /tmp/bob \109 --bootnodes /ip4/127.0.0.1/tcp/30333/p2p/QmQZ8TjTqeDj3ciwr93EJ95hxfDsb9pEYDizUAbWpigtQN \110 --chain=local \111 --bob \112 --port 30334 \113 --telemetry-url ws://telemetry.polkadot.io:1024 \114 --validator115```116117Additional CLI usage options are available and may be shown by running `cargo run -- --help`.118119120## UI custom types121```122{123 "Schedule": {124 "version": "u32",125 "put_code_per_byte_cost": "Gas",126 "grow_mem_cost": "Gas",127 "regular_op_cost": "Gas",128 "return_data_per_byte_cost": "Gas",129 "event_data_per_byte_cost": "Gas",130 "event_per_topic_cost": "Gas",131 "event_base_cost": "Gas",132 "call_base_cost": "Gas",133 "instantiate_base_cost": "Gas",134 "dispatch_base_cost": "Gas",135 "sandbox_data_read_cost": "Gas",136 "sandbox_data_write_cost": "Gas",137 "transfer_cost": "Gas",138 "instantiate_cost": "Gas",139 "max_event_topics": "u32",140 "max_stack_height": "u32",141 "max_memory_pages": "u32",142 "max_table_size": "u32",143 "enable_println": "bool",144 "max_subject_len": "u32"145 },146 "CollectionMode": {147 "_enum": {148 "Invalid": null,149 "NFT": "u32",150 "Fungible": "u32",151 "ReFungible": "(u32, u32)"152 }153 },154 "NftItemType": {155 "Collection": "u64",156 "Owner": "AccountId",157 "Data": "Vec<u8>"158 },159 "Ownership": {160 "owner": "AccountId",161 "fraction": "u128"162 },163 "ReFungibleItemType": {164 "Collection": "u64",165 "Owner": "Vec<Ownership<AccountId>>",166 "Data": "Vec<u8>"167 },168 "CollectionType": {169 "Owner": "AccountId",170 "Mode": "CollectionMode",171 "Access": "u8",172 "DecimalPoints": "u32",173 "Name": "Vec<u16>",174 "Description": "Vec<u16>",175 "TokenPrefix": "Vec<u8>",176 "CustomDataSize": "u32",177 "OffchainSchema": "Vec<u8>",178 "Sponsor": "AccountId",179 "UnconfirmedSponsor": "AccountId"180 },181 "RawData": "Vec<u8>",182 "Address": "AccountId",183 "LookupSource": "AccountId",184 "Weight": "u64"185}186```