git.delta.rocks / unique-network / refs/commits / 78becc5a95dd

--- a/.maintain/frame-weight-template.hbs
+++ b/.maintain/frame-weight-template.hbs
@@ -14,6 +14,7 @@
 #![cfg_attr(rustfmt, rustfmt_skip)]
 #![allow(unused_parens)]
 #![allow(unused_imports)]
+#![allow(missing_docs)]
 #![allow(clippy::unnecessary_cast)]
 
 use frame_support::{traits::Get, weights::{Weight, constants::RocksDbWeight}};

--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1772,41 +1772,6 @@
 ]
 
 [[package]]
-name = "darling"
-version = "0.13.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a01d95850c592940db9b8194bc39f4bc0e89dee5c4265e4b1807c34a9aba453c"
-dependencies = [
- "darling_core",
- "darling_macro",
-]
-
-[[package]]
-name = "darling_core"
-version = "0.13.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "859d65a907b6852c9361e3185c862aae7fafd2887876799fa55f5f99dc40d610"
-dependencies = [
- "fnv",
- "ident_case",
- "proc-macro2",
- "quote",
- "strsim",
- "syn",
-]
-
-[[package]]
-name = "darling_macro"
-version = "0.13.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c972679f83bdf9c42bd905396b6c3588a843a17f0f16dfcfa3e2c5d57441835"
-dependencies = [
- "darling_core",
- "quote",
- "syn",
-]
-
-[[package]]
 name = "data-encoding"
 version = "2.3.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2207,7 +2172,7 @@
 version = "0.1.1"
 dependencies = [
  "ethereum",
- "evm-coder-macros",
+ "evm-coder-procedural",
  "evm-core",
  "hex",
  "hex-literal",
@@ -2216,15 +2181,14 @@
 ]
 
 [[package]]
-name = "evm-coder-macros"
-version = "0.1.0"
+name = "evm-coder-procedural"
+version = "0.2.0"
 dependencies = [
  "Inflector",
- "darling",
  "hex",
  "proc-macro2",
  "quote",
- "sha3 0.9.1",
+ "sha3 0.10.2",
  "syn",
 ]
 
@@ -3427,12 +3391,6 @@
  "wasm-bindgen",
  "winapi",
 ]
-
-[[package]]
-name = "ident_case"
-version = "1.0.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b9e0384b61958566e926dc50660321d12159025e767c18e043daf26b70104c39"
 
 [[package]]
 name = "idna"

--- a/crates/evm-coder/Cargo.toml
+++ b/crates/evm-coder/Cargo.toml
@@ -5,15 +5,21 @@
 edition = "2021"
 
 [dependencies]
-evm-coder-macros = { path = "../evm-coder-macros" }
+# evm-coder reexports those proc-macro
+evm-coder-procedural = { path = "./procedural" }
+# Evm uses primitive-types for H160, H256 and others
 primitive-types = { version = "0.11.1", default-features = false }
-hex-literal = "0.3.3"
+# Evm doesn't have reexports for log and others
 ethereum = { version = "0.12.0", default-features = false }
+# Error types for execution
 evm-core = { default-features = false, git = "https://github.com/uniquenetwork/evm", branch = "unique-polkadot-v0.9.27" }
-impl-trait-for-tuples = "0.2.1"
+# We have tuple-heavy code in solidity.rs
+impl-trait-for-tuples = "0.2.2"
 
 [dev-dependencies]
+# We want to assert some large binary blobs equality in tests
 hex = "0.4.3"
+hex-literal = "0.3.4"
 
 [features]
 default = ["std"]

--- a/crates/evm-coder/src/abi.rs
+++ b/crates/evm-coder/src/abi.rs
@@ -14,8 +14,7 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
-//! TODO: I misunterstood therminology, abi IS rlp encoded, so
-//! this module should be replaced with rlp crate
+//! Implementation of EVM RLP reader/writer
 
 #![allow(dead_code)]
 
@@ -32,6 +31,7 @@
 
 const ABI_ALIGNMENT: usize = 32;
 
+/// View into RLP data, which provides method to read typed items from it
 #[derive(Clone)]
 pub struct AbiReader<'i> {
 	buf: &'i [u8],
@@ -39,6 +39,7 @@
 	offset: usize,
 }
 impl<'i> AbiReader<'i> {
+	/// Start reading RLP buffer, assuming there is no padding bytes
 	pub fn new(buf: &'i [u8]) -> Self {
 		Self {
 			buf,
@@ -46,6 +47,7 @@
 			offset: 0,
 		}
 	}
+	/// Start reading RLP buffer, parsing first 4 bytes as selector
 	pub fn new_call(buf: &'i [u8]) -> Result<(types::bytes4, Self)> {
 		if buf.len() < 4 {
 			return Err(Error::Error(ExitError::OutOfOffset));
@@ -109,10 +111,12 @@
 		)
 	}
 
+	/// Read [`H160`] at current position, then advance
 	pub fn address(&mut self) -> Result<H160> {
 		Ok(H160(self.read_padleft()?))
 	}
 
+	/// Read [`bool`] at current position, then advance
 	pub fn bool(&mut self) -> Result<bool> {
 		let data: [u8; 1] = self.read_padleft()?;
 		match data[0] {
@@ -122,49 +126,61 @@
 		}
 	}
 
+	/// Read [`[u8; 4]`] at current position, then advance
 	pub fn bytes4(&mut self) -> Result<[u8; 4]> {
 		self.read_padright()
 	}
 
+	/// Read [`Vec<u8>`] at current position, then advance
 	pub fn bytes(&mut self) -> Result<Vec<u8>> {
 		let mut subresult = self.subresult()?;
-		let length = subresult.read_usize()?;
+		let length = subresult.uint32()? as usize;
 		if subresult.buf.len() < subresult.offset + length {
 			return Err(Error::Error(ExitError::OutOfOffset));
 		}
 		Ok(subresult.buf[subresult.offset..subresult.offset + length].into())
 	}
+
+	/// Read [`string`] at current position, then advance
 	pub fn string(&mut self) -> Result<string> {
 		string::from_utf8(self.bytes()?).map_err(|_| Error::Error(ExitError::InvalidRange))
 	}
 
+	/// Read [`u8`] at current position, then advance
 	pub fn uint8(&mut self) -> Result<u8> {
 		Ok(self.read_padleft::<1>()?[0])
 	}
 
+	/// Read [`u32`] at current position, then advance
 	pub fn uint32(&mut self) -> Result<u32> {
 		Ok(u32::from_be_bytes(self.read_padleft()?))
 	}
 
+	/// Read [`u128`] at current position, then advance
 	pub fn uint128(&mut self) -> Result<u128> {
 		Ok(u128::from_be_bytes(self.read_padleft()?))
 	}
 
+	/// Read [`U256`] at current position, then advance
 	pub fn uint256(&mut self) -> Result<U256> {
 		let buf: [u8; 32] = self.read_padleft()?;
 		Ok(U256::from_big_endian(&buf))
 	}
 
+	/// Read [`u64`] at current position, then advance
 	pub fn uint64(&mut self) -> Result<u64> {
 		Ok(u64::from_be_bytes(self.read_padleft()?))
 	}
 
+	/// Read [`usize`] at current position, then advance
+	#[deprecated = "dangerous, as usize may have different width in wasm and native execution"]
 	pub fn read_usize(&mut self) -> Result<usize> {
 		Ok(usize::from_be_bytes(self.read_padleft()?))
 	}
 
+	/// Slice recursive buffer, advance one word for buffer offset
 	fn subresult(&mut self) -> Result<AbiReader<'i>> {
-		let offset = self.read_usize()?;
+		let offset = self.uint32()? as usize;
 		if offset + self.subresult_offset > self.buf.len() {
 			return Err(Error::Error(ExitError::InvalidRange));
 		}
@@ -175,11 +191,13 @@
 		})
 	}
 
+	/// Is this parser reached end of buffer?
 	pub fn is_finished(&self) -> bool {
 		self.buf.len() == self.offset
 	}
 }
 
+/// Writer for RLP encoded data
 #[derive(Default)]
 pub struct AbiWriter {
 	static_part: Vec<u8>,
@@ -187,9 +205,11 @@
 	had_call: bool,
 }
 impl AbiWriter {
+	/// Initialize internal buffers for output data, assuming no padding required
 	pub fn new() -> Self {
 		Self::default()
 	}
+	/// Initialize internal buffers, inserting method selector at beginning
 	pub fn new_call(method_id: u32) -> Self {
 		let mut val = Self::new();
 		val.static_part.extend(&method_id.to_be_bytes());
@@ -211,59 +231,71 @@
 			.extend(&[0; ABI_ALIGNMENT][0..ABI_ALIGNMENT - bytes.len()]);
 	}
 
+	/// Write [`H160`] to end of buffer
 	pub fn address(&mut self, address: &H160) {
 		self.write_padleft(&address.0)
 	}
 
+	/// Write [`bool`] to end of buffer
 	pub fn bool(&mut self, value: &bool) {
 		self.write_padleft(&[if *value { 1 } else { 0 }])
 	}
 
+	/// Write [`u8`] to end of buffer
 	pub fn uint8(&mut self, value: &u8) {
 		self.write_padleft(&[*value])
 	}
 
+	/// Write [`u32`] to end of buffer
 	pub fn uint32(&mut self, value: &u32) {
 		self.write_padleft(&u32::to_be_bytes(*value))
 	}
 
+	/// Write [`u128`] to end of buffer
 	pub fn uint128(&mut self, value: &u128) {
 		self.write_padleft(&u128::to_be_bytes(*value))
 	}
 
+	/// Write [`U256`] to end of buffer
 	pub fn uint256(&mut self, value: &U256) {
 		let mut out = [0; 32];
 		value.to_big_endian(&mut out);
 		self.write_padleft(&out)
 	}
 
+	/// Write [`usize`] to end of buffer
+	#[deprecated = "dangerous, as usize may have different width in wasm and native execution"]
 	pub fn write_usize(&mut self, value: &usize) {
 		self.write_padleft(&usize::to_be_bytes(*value))
 	}
 
+	/// Append recursive data, writing pending offset at end of buffer
 	pub fn write_subresult(&mut self, result: Self) {
 		self.dynamic_part.push((self.static_part.len(), result));
 		// Empty block, to be filled later
 		self.write_padleft(&[]);
 	}
 
-	pub fn memory(&mut self, value: &[u8]) {
+	fn memory(&mut self, value: &[u8]) {
 		let mut sub = Self::new();
-		sub.write_usize(&value.len());
+		sub.uint32(&(value.len() as u32));
 		for chunk in value.chunks(ABI_ALIGNMENT) {
 			sub.write_padright(chunk);
 		}
 		self.write_subresult(sub);
 	}
 
+	/// Append recursive [`str`] at end of buffer
 	pub fn string(&mut self, value: &str) {
 		self.memory(value.as_bytes())
 	}
 
+	/// Append recursive [`[u8]`] at end of buffer
 	pub fn bytes(&mut self, value: &[u8]) {
 		self.memory(value)
 	}
 
+	/// Finish writer, concatenating all internal buffers
 	pub fn finish(mut self) -> Vec<u8> {
 		for (static_offset, part) in self.dynamic_part {
 			let part_offset = self.static_part.len() - self.had_call.then(|| 4).unwrap_or(0);
@@ -278,7 +310,13 @@
 	}
 }
 
+/// [`AbiReader`] implements reading of many types, but it should
+/// be limited to types defined in spec
+///
+/// As this trait can't be made sealed,
+/// instead of having `impl AbiRead for T`, we have `impl AbiRead<T> for AbiReader`
 pub trait AbiRead<T> {
+	/// Read item from current position, advanding decoder
 	fn abi_read(&mut self) -> Result<T>;
 }
 
@@ -318,7 +356,7 @@
 {
 	fn abi_read(&mut self) -> Result<Vec<R>> {
 		let mut sub = self.subresult()?;
-		let size = sub.read_usize()?;
+		let size = sub.uint32()? as usize;
 		sub.subresult_offset = sub.offset;
 		let mut out = Vec::with_capacity(size);
 		for _ in 0..size {
@@ -366,8 +404,13 @@
 impl_tuples! {A B C D E F G H I}
 impl_tuples! {A B C D E F G H I J}
 
+/// For questions about inability to provide custom implementations,
+/// see [`AbiRead`]
 pub trait AbiWrite {
+	/// Write value to end of specified encoder
 	fn abi_write(&self, writer: &mut AbiWriter);
+	/// Specialization for [`crate::solidity_interface`] implementation,
+	/// see comment in `impl AbiWrite for ResultWithPostInfo`
 	fn to_result(&self) -> ResultWithPostInfo<AbiWriter> {
 		let mut writer = AbiWriter::new();
 		self.abi_write(&mut writer);
@@ -375,13 +418,11 @@
 	}
 }
 
+/// This particular AbiWrite implementation should be split to another trait,
+/// which only implements `to_result`, but due to lack of specialization feature
+/// in stable Rust, we can't have blanket impl of this trait `for T where T: AbiWrite`,
+/// so here we abusing default trait methods for it
 impl<T: AbiWrite> AbiWrite for ResultWithPostInfo<T> {
-	// this particular AbiWrite implementation should be split to another trait,
-	// which only implements [`to_result`]
-	//
-	// But due to lack of specialization feature in stable Rust, we can't have
-	// blanket impl of this trait `for T where T: AbiWrite`, so here we abusing
-	// default trait methods for it
 	fn abi_write(&self, _writer: &mut AbiWriter) {
 		debug_assert!(false, "shouldn't be called, see comment")
 	}
@@ -432,6 +473,8 @@
 	fn abi_write(&self, _writer: &mut AbiWriter) {}
 }
 
+/// Helper macros to parse reader into variables
+#[deprecated]
 #[macro_export]
 macro_rules! abi_decode {
 	($reader:expr, $($name:ident: $typ:ident),+ $(,)?) => {
@@ -440,6 +483,9 @@
 		)+
 	}
 }
+
+/// Helper macros to construct RLP-encoded buffer
+#[deprecated]
 #[macro_export]
 macro_rules! abi_encode {
 	($($typ:ident($value:expr)),* $(,)?) => {{

--- a/crates/evm-coder/src/events.rs
+++ b/crates/evm-coder/src/events.rs
@@ -19,11 +19,23 @@
 
 use crate::types::*;
 
+/// Implementation of this trait should not be written manually,
+/// instead use [`crate::ToLog`] proc macros.
+///
+/// See also [`evm_coder_procedural::ToLog`], [solidity docs on events](https://docs.soliditylang.org/en/develop/contracts.html#events)
 pub trait ToLog {
+	/// Convert event to [`ethereum::Log`].
+	/// Because event by itself doesn't contains current contract
+	/// address, it should be specified manually.
 	fn to_log(&self, contract: H160) -> Log;
 }
 
+/// Only items implementing `ToTopic` may be used as `#[indexed]` field
+/// in [`crate::ToLog`] macro usage.
+///
+/// See also (solidity docs on events)[<https://docs.soliditylang.org/en/develop/contracts.html#events>]
 pub trait ToTopic {
+	/// Convert value to topic to be used in [`ethereum::Log`]
 	fn to_topic(&self) -> H256;
 }
 

--- a/crates/evm-coder/src/execution.rs
+++ b/crates/evm-coder/src/execution.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+//! Contract execution related types
+
 #[cfg(not(feature = "std"))]
 use alloc::string::{String, ToString};
 use evm_core::{ExitError, ExitFatal};
@@ -22,10 +24,14 @@
 
 use crate::Weight;
 
+/// Execution error, should be convertible between EVM and Substrate.
 #[derive(Debug, Clone)]
 pub enum Error {
+	/// Non-fatal contract error occured
 	Revert(String),
+	/// EVM fatal error
 	Fatal(ExitFatal),
+	/// EVM normal error
 	Error(ExitError),
 }
 
@@ -38,9 +44,12 @@
 	}
 }
 
+/// To be used in [`crate::solidity_interface`] implementation.
 pub type Result<T> = core::result::Result<T, Error>;
 
+/// Static information collected from [`crate::weight`].
 pub struct DispatchInfo {
+	/// Statically predicted call weight
 	pub weight: Weight,
 }
 
@@ -55,16 +64,22 @@
 	}
 }
 
+/// Weight information that is only available post dispatch.
+/// Note: This can only be used to reduce the weight or fee, not increase it.
 #[derive(Default, Clone)]
 pub struct PostDispatchInfo {
+	/// Actual weight consumed by call
 	actual_weight: Option<Weight>,
 }
 
 impl PostDispatchInfo {
+	/// Calculate amount to be returned back to user
 	pub fn calc_unspent(&self, info: &DispatchInfo) -> Weight {
 		info.weight - self.calc_actual_weight(info)
 	}
 
+	/// Calculate actual consumed weight, saturating to weight reported
+	/// pre-dispatch
 	pub fn calc_actual_weight(&self, info: &DispatchInfo) -> Weight {
 		if let Some(actual_weight) = self.actual_weight {
 			actual_weight.min(info.weight)
@@ -74,9 +89,12 @@
 	}
 }
 
+/// Wrapper for PostDispatchInfo and any user-provided data
 #[derive(Clone)]
 pub struct WithPostDispatchInfo<T> {
+	/// User provided data
 	pub data: T,
+	/// Info known after dispatch
 	pub post_info: PostDispatchInfo,
 }
 
@@ -89,5 +107,6 @@
 	}
 }
 
+/// Return type of items in [`crate::solidity_interface`] definition
 pub type ResultWithPostInfo<T> =
 	core::result::Result<WithPostDispatchInfo<T>, WithPostDispatchInfo<Error>>;

--- a/crates/evm-coder/src/lib.rs
+++ b/crates/evm-coder/src/lib.rs
@@ -14,22 +14,103 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+#![doc = include_str!("../README.md")]
+#![deny(missing_docs)]
 #![cfg_attr(not(feature = "std"), no_std)]
 #[cfg(not(feature = "std"))]
 extern crate alloc;
 
 use abi::{AbiRead, AbiReader, AbiWriter};
-pub use evm_coder_macros::{event_topic, fn_selector, solidity_interface, solidity, weight, ToLog};
+pub use evm_coder_procedural::{event_topic, fn_selector};
 pub mod abi;
-pub mod events;
-pub use events::ToLog;
+pub use events::{ToLog, ToTopic};
 use execution::DispatchInfo;
 pub mod execution;
+
+/// Derives call enum implementing [`crate::Callable`], [`crate::Weighted`]
+/// and [`crate::Call`] from impl block.
+///
+/// ## Macro syntax
+///
+/// `#[solidity_interface(name, is, inline_is, events)]`
+/// - *name* - used in generated code, and for Call enum name
+/// - *is* - used to provide inheritance in Solidity
+/// - *inline_is* - same as `is`, but ERC165::SupportsInterface will work differently: For `is` SupportsInterface(A) will return true
+///   if A is one of the interfaces the contract is inherited from (e.g. B is created as `is(A)`). If B is created as `inline_is(A)`
+///   SupportsInterface(A) will internally create a new interface that combines all methods of A and B, so SupportsInterface(A) will return
+///   false.
+///
+/// `#[weight(value)]`
+/// Can be added to every method of impl block, used for deriving [`crate::Weighted`], which
+/// is used by substrate bridge.
+/// - *value*: expression, which evaluates to weight required to call this method.
+/// This expression can use call arguments to calculate non-constant execution time.
+/// This expression should evaluate faster than actual execution does, and may provide worse case
+/// than one is called.
+///
+/// `#[solidity_interface(rename_selector)]`
+/// - *rename_selector* - by default, selector name will be generated by transforming method name
+/// from snake_case to camelCase. Use this option, if other naming convention is required.
+/// I.e: method `token_uri` will be automatically renamed to `tokenUri` in selector, but name
+/// required by ERC721 standard is `tokenURI`, thus we need to specify `rename_selector = "tokenURI"`
+/// explicitly.
+///
+/// Both contract and contract methods may have doccomments, which will end up in a generated
+/// solidity interface file, thus you should use [solidity syntax](https://docs.soliditylang.org/en/latest/natspec-format.html) for writing documentation in this macro
+///
+/// ## Example
+///
+/// ```ignore
+/// struct SuperContract;
+/// struct InlineContract;
+/// struct Contract;
+///
+/// #[derive(ToLog)]
+/// enum ContractEvents {
+///     Event(#[indexed] uint32),
+/// }
+///
+/// /// @dev This contract provides function to multiply two numbers
+/// #[solidity_interface(name = MyContract, is(SuperContract), inline_is(InlineContract))]
+/// impl Contract {
+///     /// Multiply two numbers
+/// 	/// @param a First number
+/// 	/// @param b Second number
+/// 	/// @return uint32 Product of two passed numbers
+/// 	/// @dev This function returns error in case of overflow
+///     #[weight(200 + a + b)]
+///     #[solidity_interface(rename_selector = "mul")]
+///     fn mul(&mut self, a: uint32, b: uint32) -> Result<uint32> {
+///         Ok(a.checked_mul(b).ok_or("overflow")?)
+///     }
+/// }
+/// ```
+pub use evm_coder_procedural::solidity_interface;
+/// See [`solidity_interface`]
+pub use evm_coder_procedural::solidity;
+/// See [`solidity_interface`]
+pub use evm_coder_procedural::weight;
+
+/// Derives [`ToLog`] for enum
+///
+/// Selectors will be derived from variant names, there is currently no way to have custom naming
+/// for them
+///
+/// `#[indexed]`
+/// Marks this field as indexed, so it will appear in [`ethereum::Log`] topics instead of data
+pub use evm_coder_procedural::ToLog;
+
+// Api of those modules shouldn't be consumed directly, it is only exported for usage in proc macros
+#[doc(hidden)]
+pub mod events;
+#[doc(hidden)]
 pub mod solidity;
 
-/// Solidity type definitions
+/// Solidity type definitions (aliases from solidity name to rust type)
+/// To be used in [`solidity_interface`] definitions, to make sure there is no
+/// type conflict between Rust code and generated definitions
 pub mod types {
-	#![allow(non_camel_case_types)]
+	#![allow(non_camel_case_types, missing_docs)]
 
 	#[cfg(not(feature = "std"))]
 	use alloc::{vec::Vec};
@@ -54,6 +135,8 @@
 	pub type string = ::std::string::String;
 	pub type bytes = Vec<u8>;
 
+	/// Solidity doesn't have `void` type, however we have special implementation
+	/// for empty tuple return type
 	pub type void = ();
 
 	//#region Special types
@@ -63,36 +146,64 @@
 	pub type caller = address;
 	//#endregion
 
+	/// Ethereum typed call message, similar to solidity
+	/// `msg` object.
 	pub struct Msg<C> {
 		pub call: C,
+		/// Address of user, which called this contract.
 		pub caller: H160,
+		/// Payment amount to contract.
+		/// Contract should reject payment, if target call is not payable,
+		/// and there is no `receiver()` function defined.
 		pub value: U256,
 	}
 }
 
+/// Parseable EVM call, this trait should be implemented with [`solidity_interface`] macro
 pub trait Call: Sized {
+	/// Parse call buffer into typed call enum
 	fn parse(selector: types::bytes4, input: &mut AbiReader) -> execution::Result<Option<Self>>;
 }
 
+/// Intended to be used as `#[weight]` output type
+/// Should be same between evm-coder and substrate to avoid confusion
+///
+/// Isn't same thing as gas, some mapping is required between those types
 pub type Weight = u64;
 
+/// In substrate, we have benchmarking, which allows
+/// us to not rely on gas metering, but instead predict amount of gas to execute call
 pub trait Weighted: Call {
+	/// Predict weight of this call
 	fn weight(&self) -> DispatchInfo;
 }
 
+/// Type callable with ethereum message, may be implemented by [`solidity_interface`] macro
+/// on interface implementation, or for externally-owned real EVM contract
 pub trait Callable<C: Call> {
+	/// Call contract using specified call data
 	fn call(&mut self, call: types::Msg<C>) -> execution::ResultWithPostInfo<AbiWriter>;
 }
 
-/// Implementation is implicitly provided for all interfaces
+/// Implementation of ERC165 is implicitly generated for all interfaces in [`solidity_interface`],
+/// this structure holds parsed data for ERC165Call subvariant
+///
+/// Note: no [`Callable`] implementation is provided, call implementation is inlined into every
+/// implementing contract
 ///
-/// Note: no Callable implementation is provided
+/// See <https://eips.ethereum.org/EIPS/eip-165>
 #[derive(Debug)]
 pub enum ERC165Call {
-	SupportsInterface { interface_id: types::bytes4 },
+	/// ERC165 provides single method, which returns true, if contract
+	/// implements specified interface
+	SupportsInterface {
+		/// Requested interface
+		interface_id: types::bytes4,
+	},
 }
 
 impl ERC165Call {
+	/// ERC165 selector is provided by standard
 	pub const INTERFACE_ID: types::bytes4 = u32::to_be_bytes(0x01ffc9a7);
 }
 

--- a/crates/evm-coder/src/solidity.rs
+++ b/crates/evm-coder/src/solidity.rs
@@ -14,26 +14,31 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+//! Implementation detail of [`crate::solidity_interface`] macro code-generation.
+//! You should not rely on any public item from this module, as it is only intended to be used
+//! by procedural macro, API and output format may be changed at any time.
+//!
+//! Purpose of this module is to receive solidity contract definition in module-specified
+//! format, and then output string, representing interface of this contract in solidity language
+
 #[cfg(not(feature = "std"))]
-use alloc::{
-	string::String,
-	vec::Vec,
-	collections::{BTreeSet, BTreeMap},
-	format,
-};
+use alloc::{string::String, vec::Vec, collections::BTreeMap, format};
 #[cfg(feature = "std")]
-use std::collections::{BTreeSet, BTreeMap};
+use std::collections::BTreeMap;
 use core::{
 	fmt::{self, Write},
 	marker::PhantomData,
 	cell::{Cell, RefCell},
+	cmp::Reverse,
 };
 use impl_trait_for_tuples::impl_for_tuples;
 use crate::types::*;
 
 #[derive(Default)]
 pub struct TypeCollector {
-	structs: RefCell<BTreeSet<string>>,
+	/// Code => id
+	/// id ordering is required to perform topo-sort on the resulting data
+	structs: RefCell<BTreeMap<string, usize>>,
 	anonymous: RefCell<BTreeMap<Vec<string>, usize>>,
 	id: Cell<usize>,
 }
@@ -42,7 +47,8 @@
 		Self::default()
 	}
 	pub fn collect(&self, item: string) {
-		self.structs.borrow_mut().insert(item);
+		let id = self.next_id();
+		self.structs.borrow_mut().insert(item, id);
 	}
 	pub fn next_id(&self) -> usize {
 		let v = self.id.get();
@@ -56,7 +62,7 @@
 		}
 		let id = self.next_id();
 		let mut str = String::new();
-		writeln!(str, "// Anonymous struct").unwrap();
+		writeln!(str, "/// @dev anonymous struct").unwrap();
 		writeln!(str, "struct Tuple{} {{", id).unwrap();
 		for (i, name) in names.iter().enumerate() {
 			writeln!(str, "\t{} field_{};", name, i).unwrap();
@@ -66,15 +72,19 @@
 		self.anonymous.borrow_mut().insert(names, id);
 		format!("Tuple{}", id)
 	}
-	pub fn finish(self) -> BTreeSet<string> {
-		self.structs.into_inner()
+	pub fn finish(self) -> Vec<string> {
+		let mut data = self.structs.into_inner().into_iter().collect::<Vec<_>>();
+		data.sort_by_key(|(_, id)| Reverse(*id));
+		data.into_iter().map(|(code, _)| code).collect()
 	}
 }
 
 pub trait SolidityTypeName: 'static {
 	fn solidity_name(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
+	/// "simple" types are stored inline, no `memory` modifier should be used in solidity
 	fn is_simple() -> bool;
 	fn solidity_default(writer: &mut impl fmt::Write, tc: &TypeCollector) -> fmt::Result;
+	/// Specialization
 	fn is_void() -> bool {
 		false
 	}
@@ -125,6 +135,10 @@
 }
 
 mod sealed {
+	/// Not every type should be directly placed in vec.
+	/// Vec encoding is not memory efficient, as every item will be padded
+	/// to 32 bytes.
+	/// Instead you should use specialized types (`bytes` in case of `Vec<u8>`)
 	pub trait CanBePlacedInVec {}
 }
 
@@ -402,7 +416,8 @@
 }
 pub struct SolidityFunction<A, R> {
 	pub docs: &'static [&'static str],
-	pub selector: &'static str,
+	pub selector_str: &'static str,
+	pub selector: u32,
 	pub name: &'static str,
 	pub args: A,
 	pub result: R,
@@ -416,12 +431,14 @@
 		tc: &TypeCollector,
 	) -> fmt::Result {
 		for doc in self.docs {
-			writeln!(writer, "\t//{}", doc)?;
-		}
-		if !self.docs.is_empty() {
-			writeln!(writer, "\t//")?;
+			writeln!(writer, "\t///{}", doc)?;
 		}
-		writeln!(writer, "\t// Selector: {}", self.selector)?;
+		writeln!(
+			writer,
+			"\t/// @dev EVM selector for this function is: 0x{:0>8x},",
+			self.selector
+		)?;
+		writeln!(writer, "\t///  or in textual repr: {}", self.selector_str)?;
 		write!(writer, "\tfunction {}(", self.name)?;
 		self.args.solidity_name(writer, tc)?;
 		write!(writer, ")")?;
@@ -481,6 +498,7 @@
 }
 
 pub struct SolidityInterface<F: SolidityFunctions> {
+	pub docs: &'static [&'static str],
 	pub selector: bytes4,
 	pub name: &'static str,
 	pub is: &'static [&'static str],
@@ -495,10 +513,13 @@
 		tc: &TypeCollector,
 	) -> fmt::Result {
 		const ZERO_BYTES: [u8; 4] = [0; 4];
+		for doc in self.docs {
+			writeln!(out, "///{}", doc)?;
+		}
 		if self.selector != ZERO_BYTES {
 			writeln!(
 				out,
-				"// Selector: {:0>8x}",
+				"/// @dev the ERC-165 identifier for this interface is 0x{:0>8x}",
 				u32::from_be_bytes(self.selector)
 			)?;
 		}

--- a/crates/evm-coder/tests/generics.rs
+++ b/crates/evm-coder/tests/generics.rs
@@ -19,14 +19,14 @@
 
 struct Generic<T>(PhantomData<T>);
 
-#[solidity_interface(name = "GenericIs")]
+#[solidity_interface(name = GenericIs)]
 impl<T> Generic<T> {
 	fn test_1(&self) -> Result<uint256> {
 		unreachable!()
 	}
 }
 
-#[solidity_interface(name = "Generic", is(GenericIs))]
+#[solidity_interface(name = Generic, is(GenericIs))]
 impl<T: Into<u32>> Generic<T> {
 	fn test_2(&self) -> Result<uint256> {
 		unreachable!()
@@ -35,7 +35,7 @@
 
 generate_stubgen!(gen_iface, GenericCall<()>, false);
 
-#[solidity_interface(name = "GenericWhere")]
+#[solidity_interface(name = GenericWhere)]
 impl<T> Generic<T>
 where
 	T: core::fmt::Debug,

--- a/crates/evm-coder/tests/random.rs
+++ b/crates/evm-coder/tests/random.rs
@@ -21,14 +21,14 @@
 
 struct Impls;
 
-#[solidity_interface(name = "OurInterface")]
+#[solidity_interface(name = OurInterface)]
 impl Impls {
 	fn fn_a(&self, _input: uint256) -> Result<bool> {
 		unreachable!()
 	}
 }
 
-#[solidity_interface(name = "OurInterface1")]
+#[solidity_interface(name = OurInterface1)]
 impl Impls {
 	fn fn_b(&self, _input: uint128) -> Result<uint32> {
 		unreachable!()
@@ -48,7 +48,7 @@
 }
 
 #[solidity_interface(
-	name = "OurInterface2",
+	name = OurInterface2,
 	is(OurInterface),
 	inline_is(OurInterface1),
 	events(OurEvents)
@@ -79,3 +79,9 @@
 		unreachable!()
 	}
 }
+
+#[solidity_interface(
+	name = ValidSelector,
+	expect_selector = 0x00000000,
+)]
+impl Impls {}

--- a/crates/evm-coder/tests/solidity_generation.rs
+++ b/crates/evm-coder/tests/solidity_generation.rs
@@ -18,7 +18,7 @@
 
 struct ERC20;
 
-#[solidity_interface(name = "ERC20")]
+#[solidity_interface(name = ERC20)]
 impl ERC20 {
 	fn decimals(&self) -> Result<uint8> {
 		unreachable!()

--- a/node/cli/src/chain_spec.rs
+++ b/node/cli/src/chain_spec.rs
@@ -115,7 +115,7 @@
 		.public()
 }
 
-/// The extensions for the [`ChainSpec`].
+/// The extensions for the [`DefaultChainSpec`].
 #[derive(Debug, Clone, PartialEq, Serialize, Deserialize, ChainSpecGroup, ChainSpecExtension)]
 #[serde(deny_unknown_fields)]
 pub struct Extensions {

--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -60,7 +60,7 @@
 }
 
 /// @title A contract that allows you to work with collections.
-#[solidity_interface(name = "Collection")]
+#[solidity_interface(name = Collection)]
 impl<T: Config> CollectionHandle<T>
 where
 	T::AccountId: From<[u8; 32]>,
@@ -228,7 +228,7 @@
 	}
 
 	/// Add collection admin by substrate address.
-	/// @param new_admin Substrate administrator address.
+	/// @param newAdmin Substrate administrator address.
 	fn add_collection_admin_substrate(
 		&mut self,
 		caller: caller,
@@ -254,7 +254,7 @@
 	}
 
 	/// Add collection admin.
-	/// @param new_admin Address of the added administrator.
+	/// @param newAdmin Address of the added administrator.
 	fn add_collection_admin(&mut self, caller: caller, new_admin: address) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let new_admin = T::CrossAccountId::from_eth(new_admin);
@@ -264,7 +264,7 @@
 
 	/// Remove collection admin.
 	///
-	/// @param new_admin Address of the removed administrator.
+	/// @param admin Address of the removed administrator.
 	fn remove_collection_admin(&mut self, caller: caller, admin: address) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let admin = T::CrossAccountId::from_eth(admin);

--- a/pallets/evm-contract-helpers/src/eth.rs
+++ b/pallets/evm-contract-helpers/src/eth.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+//! Implementation of magic contract
+
 use core::marker::PhantomData;
 use evm_coder::{abi::AbiWriter, execution::Result, generate_stubgen, solidity_interface, types::*};
 use pallet_evm_coder_substrate::{SubstrateRecorder, WithRecorder, dispatch_to_evm};
@@ -31,7 +33,8 @@
 use up_sponsorship::SponsorshipHandler;
 use sp_std::vec::Vec;
 
-struct ContractHelpers<T: Config>(SubstrateRecorder<T>);
+/// See [`ContractHelpersCall`]
+pub struct ContractHelpers<T: Config>(SubstrateRecorder<T>);
 impl<T: Config> WithRecorder<T> for ContractHelpers<T> {
 	fn recorder(&self) -> &SubstrateRecorder<T> {
 		&self.0
@@ -42,22 +45,25 @@
 	}
 }
 
-#[solidity_interface(name = "ContractHelpers")]
+/// @title Magic contract, which allows users to reconfigure other contracts
+#[solidity_interface(name = ContractHelpers)]
 impl<T: Config> ContractHelpers<T>
 where
 	T::AccountId: AsRef<[u8; 32]>,
 {
-	/// Get contract ovner
-	///
-	/// @param Contract_address contract for which the owner is being determined.
-	/// @return Contract owner.
+	/// Get user, which deployed specified contract
+	/// @dev May return zero address in case if contract is deployed
+	///  using uniquenetwork evm-migration pallet, or using other terms not
+	///  intended by pallet-evm
+	/// @dev Returns zero address if contract does not exists
+	/// @param contractAddress Contract to get owner of
+	/// @return address Owner of contract
 	fn contract_owner(&self, contract_address: address) -> Result<address> {
 		Ok(<Owner<T>>::get(contract_address))
 	}
 
 	/// Set sponsor.
-	///
-	/// @param contract_address Contract for which a sponsor is being established.
+	/// @param contractAddress Contract for which a sponsor is being established.
 	/// @param sponsor User address who set as pending sponsor.
 	fn set_sponsor(
 		&mut self,
@@ -80,7 +86,7 @@
 
 	/// Set contract as self sponsored.
 	///
-	/// @param contract_address Contract for which a self sponsoring is being enabled.
+	/// @param contractAddress Contract for which a self sponsoring is being enabled.
 	fn self_sponsored_enable(&mut self, caller: caller, contract_address: address) -> Result<void> {
 		self.recorder().consume_sload()?;
 		self.recorder().consume_sstore()?;
@@ -93,7 +99,7 @@
 
 	/// Remove sponsor.
 	///
-	/// @param contract_address Contract for which a sponsorship is being removed.
+	/// @param contractAddress Contract for which a sponsorship is being removed.
 	fn remove_sponsor(&mut self, caller: caller, contract_address: address) -> Result<void> {
 		self.recorder().consume_sload()?;
 		self.recorder().consume_sstore()?;
@@ -106,9 +112,9 @@
 
 	/// Confirm sponsorship.
 	///
-	/// @dev Caller must be same that set via [`set_sponsor`].
+	/// @dev Caller must be same that set via [`setSponsor`].
 	///
-	/// @param contract_address Сontract for which need to confirm sponsorship.
+	/// @param contractAddress Сontract for which need to confirm sponsorship.
 	fn confirm_sponsorship(&mut self, caller: caller, contract_address: address) -> Result<void> {
 		self.recorder().consume_sload()?;
 		self.recorder().consume_sstore()?;
@@ -121,7 +127,7 @@
 
 	/// Get current sponsor.
 	///
-	/// @param contract_address The contract for which a sponsor is requested.
+	/// @param contractAddress The contract for which a sponsor is requested.
 	/// @return Tuble with sponsor address and his substrate mirror. If there is no confirmed sponsor error "Contract has no sponsor" throw.
 	fn get_sponsor(&self, contract_address: address) -> Result<(address, uint256)> {
 		let sponsor =
@@ -138,7 +144,7 @@
 
 	/// Check tat contract has confirmed sponsor.
 	///
-	/// @param contract_address The contract for which the presence of a confirmed sponsor is checked.
+	/// @param contractAddress The contract for which the presence of a confirmed sponsor is checked.
 	/// @return **true** if contract has confirmed sponsor.
 	fn has_sponsor(&self, contract_address: address) -> Result<bool> {
 		Ok(Pallet::<T>::get_sponsor(contract_address).is_some())
@@ -146,7 +152,7 @@
 
 	/// Check tat contract has pending sponsor.
 	///
-	/// @param contract_address The contract for which the presence of a pending sponsor is checked.
+	/// @param contractAddress The contract for which the presence of a pending sponsor is checked.
 	/// @return **true** if contract has pending sponsor.
 	fn has_pending_sponsor(&self, contract_address: address) -> Result<bool> {
 		Ok(match Sponsoring::<T>::get(contract_address) {
@@ -163,6 +169,7 @@
 		&mut self,
 		caller: caller,
 		contract_address: address,
+		// TODO: implement support for enums in evm-coder
 		mode: uint8,
 	) -> Result<void> {
 		self.recorder().consume_sload()?;
@@ -175,10 +182,21 @@
 		Ok(())
 	}
 
-	fn sponsoring_mode(&self, contract_address: address) -> Result<uint8> {
-		Ok(<Pallet<T>>::sponsoring_mode(contract_address).to_eth())
+	/// Get current contract sponsoring rate limit
+	/// @param contractAddress Contract to get sponsoring mode of
+	/// @return uint32 Amount of blocks between two sponsored transactions
+	fn get_sponsoring_rate_limit(&self, contract_address: address) -> Result<uint32> {
+		Ok(<SponsoringRateLimit<T>>::get(contract_address)
+			.try_into()
+			.map_err(|_| "rate limit > u32::MAX")?)
 	}
 
+	/// Set contract sponsoring rate limit
+	/// @dev Sponsoring rate limit - is a minimum amount of blocks that should
+	///  pass between two sponsored transactions
+	/// @param contractAddress Contract to change sponsoring rate limit of
+	/// @param rateLimit Target rate limit
+	/// @dev Only contract owner can change this setting
 	fn set_sponsoring_rate_limit(
 		&mut self,
 		caller: caller,
@@ -190,57 +208,70 @@
 
 		<Pallet<T>>::ensure_owner(contract_address, caller).map_err(dispatch_to_evm::<T>)?;
 		<Pallet<T>>::set_sponsoring_rate_limit(contract_address, rate_limit.into());
-
 		Ok(())
 	}
 
-	fn get_sponsoring_rate_limit(&self, contract_address: address) -> Result<uint32> {
-		Ok(<SponsoringRateLimit<T>>::get(contract_address)
-			.try_into()
-			.map_err(|_| "rate limit > u32::MAX")?)
-	}
-
+	/// Is specified user present in contract allow list
+	/// @dev Contract owner always implicitly included
+	/// @param contractAddress Contract to check allowlist of
+	/// @param user User to check
+	/// @return bool Is specified users exists in contract allowlist
 	fn allowed(&self, contract_address: address, user: address) -> Result<bool> {
 		self.0.consume_sload()?;
 		Ok(<Pallet<T>>::allowed(contract_address, user))
 	}
 
-	fn allowlist_enabled(&self, contract_address: address) -> Result<bool> {
-		Ok(<AllowlistEnabled<T>>::get(contract_address))
-	}
-
-	fn toggle_allowlist(
+	/// Toggle user presence in contract allowlist
+	/// @param contractAddress Contract to change allowlist of
+	/// @param user Which user presence should be toggled
+	/// @param isAllowed `true` if user should be allowed to be sponsored
+	///  or call this contract, `false` otherwise
+	/// @dev Only contract owner can change this setting
+	fn toggle_allowed(
 		&mut self,
 		caller: caller,
 		contract_address: address,
-		enabled: bool,
+		user: address,
+		is_allowed: bool,
 	) -> Result<void> {
 		self.recorder().consume_sload()?;
 		self.recorder().consume_sstore()?;
 
 		<Pallet<T>>::ensure_owner(contract_address, caller).map_err(dispatch_to_evm::<T>)?;
-		<Pallet<T>>::toggle_allowlist(contract_address, enabled);
+		<Pallet<T>>::toggle_allowed(contract_address, user, is_allowed);
 
 		Ok(())
 	}
 
-	fn toggle_allowed(
+	/// Is this contract has allowlist access enabled
+	/// @dev Allowlist always can have users, and it is used for two purposes:
+	///  in case of allowlist sponsoring mode, users will be sponsored if they exist in allowlist
+	///  in case of allowlist access enabled, only users from allowlist may call this contract
+	/// @param contractAddress Contract to get allowlist access of
+	/// @return bool Is specified contract has allowlist access enabled
+	fn allowlist_enabled(&self, contract_address: address) -> Result<bool> {
+		Ok(<AllowlistEnabled<T>>::get(contract_address))
+	}
+
+	/// Toggle contract allowlist access
+	/// @param contractAddress Contract to change allowlist access of
+	/// @param enabled Should allowlist access to be enabled?
+	fn toggle_allowlist(
 		&mut self,
 		caller: caller,
 		contract_address: address,
-		user: address,
-		allowed: bool,
+		enabled: bool,
 	) -> Result<void> {
 		self.recorder().consume_sload()?;
 		self.recorder().consume_sstore()?;
 
 		<Pallet<T>>::ensure_owner(contract_address, caller).map_err(dispatch_to_evm::<T>)?;
-		<Pallet<T>>::toggle_allowed(contract_address, user, allowed);
-
+		<Pallet<T>>::toggle_allowlist(contract_address, enabled);
 		Ok(())
 	}
 }
 
+/// Implements [`OnMethodCall`], which delegates call to [`ContractHelpers`]
 pub struct HelpersOnMethodCall<T: Config>(PhantomData<*const T>);
 impl<T: Config> OnMethodCall<T> for HelpersOnMethodCall<T>
 where
@@ -283,6 +314,7 @@
 	}
 }
 
+/// Hooks into contract creation, storing owner of newly deployed contract
 pub struct HelpersOnCreate<T: Config>(PhantomData<*const T>);
 impl<T: Config> OnCreate<T> for HelpersOnCreate<T> {
 	fn on_create(owner: H160, contract: H160) {
@@ -290,6 +322,7 @@
 	}
 }
 
+/// Bridge to pallet-sponsoring
 pub struct HelpersContractSponsoring<T: Config>(PhantomData<*const T>);
 impl<T: Config> SponsorshipHandler<T::CrossAccountId, (H160, Vec<u8>)>
 	for HelpersContractSponsoring<T>

--- a/pallets/evm-contract-helpers/src/lib.rs
+++ b/pallets/evm-contract-helpers/src/lib.rs
@@ -14,7 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+#![doc = include_str!("../README.md")]
 #![cfg_attr(not(feature = "std"), no_std)]
+#![deny(missing_docs)]
 
 use codec::{Decode, Encode, MaxEncodedLen};
 pub use pallet::*;
@@ -35,13 +37,16 @@
 	pub trait Config:
 		frame_system::Config + pallet_evm_coder_substrate::Config + pallet_evm::account::Config
 	{
+		/// Address, under which magic contract will be available
 		type ContractAddress: Get<H160>;
+		/// In case of enabled sponsoring, but no sponsoring rate limit set,
+		/// this value will be used implicitly
 		type DefaultSponsoringRateLimit: Get<Self::BlockNumber>;
 	}
 
 	#[pallet::error]
 	pub enum Error<T> {
-		/// This method is only executable by owner.
+		/// This method is only executable by contract owner
 		NoPermission,
 
 		/// No pending sponsor for contract.
@@ -217,6 +222,7 @@
 			}
 		}
 
+		/// Get current sponsoring mode, performing lazy migration from legacy storage
 		pub fn sponsoring_mode(contract: H160) -> SponsoringModeT {
 			<SponsoringMode<T>>::get(contract)
 				.or_else(|| {
@@ -225,6 +231,7 @@
 				.unwrap_or_default()
 		}
 
+		/// Reconfigure contract sponsoring mode
 		pub fn set_sponsoring_mode(contract: H160, mode: SponsoringModeT) {
 			if mode == SponsoringModeT::Disabled {
 				<SponsoringMode<T>>::remove(contract);
@@ -234,22 +241,27 @@
 			<SelfSponsoring<T>>::remove(contract)
 		}
 
+		/// Set duration between two sponsored contract calls
 		pub fn set_sponsoring_rate_limit(contract: H160, rate_limit: T::BlockNumber) {
 			<SponsoringRateLimit<T>>::insert(contract, rate_limit);
 		}
 
+		/// Is user added to allowlist, or he is owner of specified contract
 		pub fn allowed(contract: H160, user: H160) -> bool {
 			<Allowlist<T>>::get(&contract, &user) || <Owner<T>>::get(&contract) == user
 		}
 
+		/// Toggle contract allowlist access
 		pub fn toggle_allowlist(contract: H160, enabled: bool) {
 			<AllowlistEnabled<T>>::insert(contract, enabled)
 		}
 
+		/// Toggle user presence in contract's allowlist
 		pub fn toggle_allowed(contract: H160, user: H160, allowed: bool) {
 			<Allowlist<T>>::insert(contract, user, allowed);
 		}
 
+		/// Throw error if user is not allowed to reconfigure target contract
 		pub fn ensure_owner(contract: H160, user: H160) -> DispatchResult {
 			ensure!(<Owner<T>>::get(&contract) == user, Error::<T>::NoPermission);
 			Ok(())
@@ -257,10 +269,15 @@
 	}
 }
 
-#[derive(Encode, Decode, PartialEq, TypeInfo, MaxEncodedLen)]
+/// Available contract sponsoring modes
+#[derive(Encode, Decode, PartialEq, TypeInfo, MaxEncodedLen, Default)]
 pub enum SponsoringModeT {
+	/// Sponsoring is disabled
+	#[default]
 	Disabled,
+	/// Only users from allowlist will be sponsored
 	Allowlisted,
+	/// All users will be sponsored
 	Generous,
 }
 
@@ -279,11 +296,5 @@
 			SponsoringModeT::Allowlisted => 1,
 			SponsoringModeT::Generous => 2,
 		}
-	}
-}
-
-impl Default for SponsoringModeT {
-	fn default() -> Self {
-		Self::Disabled
 	}
 }

binary blob — no preview

--- a/pallets/evm-contract-helpers/src/stubs/ContractHelpers.sol
+++ b/pallets/evm-contract-helpers/src/stubs/ContractHelpers.sol
@@ -3,13 +3,7 @@
 
 pragma solidity >=0.8.0 <0.9.0;
 
-// Anonymous struct
-struct Tuple0 {
-	address field_0;
-	uint256 field_1;
-}
-
-// Common stubs holder
+/// @dev common stubs holder
 contract Dummy {
 	uint8 dummy;
 	string stub_error = "this contract is implemented in native";
@@ -27,14 +21,18 @@
 	}
 }
 
-// Selector: 6073d917
+/// @title Magic contract, which allows users to reconfigure other contracts
+/// @dev the ERC-165 identifier for this interface is 0xd77fab70
 contract ContractHelpers is Dummy, ERC165 {
-	// Get contract ovner
-	//
-	// @param Contract_address contract for which the owner is being determined.
-	// @return Contract owner.
-	//
-	// Selector: contractOwner(address) 5152b14c
+	/// Get user, which deployed specified contract
+	/// @dev May return zero address in case if contract is deployed
+	///  using uniquenetwork evm-migration pallet, or using other terms not
+	///  intended by pallet-evm
+	/// @dev Returns zero address if contract does not exists
+	/// @param contractAddress Contract to get owner of
+	/// @return address Owner of contract
+	/// @dev EVM selector for this function is: 0x5152b14c,
+	///  or in textual repr: contractOwner(address)
 	function contractOwner(address contractAddress)
 		public
 		view
@@ -46,12 +44,11 @@
 		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Set sponsor.
-	//
-	// @param contract_address Contract for which a sponsor is being established.
-	// @param sponsor User address who set as pending sponsor.
-	//
-	// Selector: setSponsor(address,address) f01fba93
+	/// Set sponsor.
+	/// @param contractAddress Contract for which a sponsor is being established.
+	/// @param sponsor User address who set as pending sponsor.
+	/// @dev EVM selector for this function is: 0xf01fba93,
+	///  or in textual repr: setSponsor(address,address)
 	function setSponsor(address contractAddress, address sponsor) public {
 		require(false, stub_error);
 		contractAddress;
@@ -59,47 +56,47 @@
 		dummy = 0;
 	}
 
-	// Set contract as self sponsored.
-	//
-	// @param contract_address Contract for which a self sponsoring is being enabled.
-	//
-	// Selector: selfSponsoredEnable(address) 89f7d9ae
+	/// Set contract as self sponsored.
+	///
+	/// @param contractAddress Contract for which a self sponsoring is being enabled.
+	/// @dev EVM selector for this function is: 0x89f7d9ae,
+	///  or in textual repr: selfSponsoredEnable(address)
 	function selfSponsoredEnable(address contractAddress) public {
 		require(false, stub_error);
 		contractAddress;
 		dummy = 0;
 	}
 
-	// Remove sponsor.
-	//
-	// @param contract_address Contract for which a sponsorship is being removed.
-	//
-	// Selector: removeSponsor(address) ef784250
+	/// Remove sponsor.
+	///
+	/// @param contractAddress Contract for which a sponsorship is being removed.
+	/// @dev EVM selector for this function is: 0xef784250,
+	///  or in textual repr: removeSponsor(address)
 	function removeSponsor(address contractAddress) public {
 		require(false, stub_error);
 		contractAddress;
 		dummy = 0;
 	}
 
-	// Confirm sponsorship.
-	//
-	// @dev Caller must be same that set via [`set_sponsor`].
-	//
-	// @param contract_address Сontract for which need to confirm sponsorship.
-	//
-	// Selector: confirmSponsorship(address) abc00001
+	/// Confirm sponsorship.
+	///
+	/// @dev Caller must be same that set via [`setSponsor`].
+	///
+	/// @param contractAddress Сontract for which need to confirm sponsorship.
+	/// @dev EVM selector for this function is: 0xabc00001,
+	///  or in textual repr: confirmSponsorship(address)
 	function confirmSponsorship(address contractAddress) public {
 		require(false, stub_error);
 		contractAddress;
 		dummy = 0;
 	}
 
-	// Get current sponsor.
-	//
-	// @param contract_address The contract for which a sponsor is requested.
-	// @return Tuble with sponsor address and his substrate mirror. If there is no confirmed sponsor error "Contract has no sponsor" throw.
-	//
-	// Selector: getSponsor(address) 743fc745
+	/// Get current sponsor.
+	///
+	/// @param contractAddress The contract for which a sponsor is requested.
+	/// @return Tuble with sponsor address and his substrate mirror. If there is no confirmed sponsor error "Contract has no sponsor" throw.
+	/// @dev EVM selector for this function is: 0x743fc745,
+	///  or in textual repr: getSponsor(address)
 	function getSponsor(address contractAddress)
 		public
 		view
@@ -111,12 +108,12 @@
 		return Tuple0(0x0000000000000000000000000000000000000000, 0);
 	}
 
-	// Check tat contract has confirmed sponsor.
-	//
-	// @param contract_address The contract for which the presence of a confirmed sponsor is checked.
-	// @return **true** if contract has confirmed sponsor.
-	//
-	// Selector: hasSponsor(address) 97418603
+	/// Check tat contract has confirmed sponsor.
+	///
+	/// @param contractAddress The contract for which the presence of a confirmed sponsor is checked.
+	/// @return **true** if contract has confirmed sponsor.
+	/// @dev EVM selector for this function is: 0x97418603,
+	///  or in textual repr: hasSponsor(address)
 	function hasSponsor(address contractAddress) public view returns (bool) {
 		require(false, stub_error);
 		contractAddress;
@@ -124,12 +121,12 @@
 		return false;
 	}
 
-	// Check tat contract has pending sponsor.
-	//
-	// @param contract_address The contract for which the presence of a pending sponsor is checked.
-	// @return **true** if contract has pending sponsor.
-	//
-	// Selector: hasPendingSponsor(address) 39b9b242
+	/// Check tat contract has pending sponsor.
+	///
+	/// @param contractAddress The contract for which the presence of a pending sponsor is checked.
+	/// @return **true** if contract has pending sponsor.
+	/// @dev EVM selector for this function is: 0x39b9b242,
+	///  or in textual repr: hasPendingSponsor(address)
 	function hasPendingSponsor(address contractAddress)
 		public
 		view
@@ -141,7 +138,8 @@
 		return false;
 	}
 
-	// Selector: sponsoringEnabled(address) 6027dc61
+	/// @dev EVM selector for this function is: 0x6027dc61,
+	///  or in textual repr: sponsoringEnabled(address)
 	function sponsoringEnabled(address contractAddress)
 		public
 		view
@@ -153,7 +151,8 @@
 		return false;
 	}
 
-	// Selector: setSponsoringMode(address,uint8) fde8a560
+	/// @dev EVM selector for this function is: 0xfde8a560,
+	///  or in textual repr: setSponsoringMode(address,uint8)
 	function setSponsoringMode(address contractAddress, uint8 mode) public {
 		require(false, stub_error);
 		contractAddress;
@@ -161,11 +160,15 @@
 		dummy = 0;
 	}
 
-	// Selector: sponsoringMode(address) b70c7267
-	function sponsoringMode(address contractAddress)
+	/// Get current contract sponsoring rate limit
+	/// @param contractAddress Contract to get sponsoring mode of
+	/// @return uint32 Amount of blocks between two sponsored transactions
+	/// @dev EVM selector for this function is: 0x610cfabd,
+	///  or in textual repr: getSponsoringRateLimit(address)
+	function getSponsoringRateLimit(address contractAddress)
 		public
 		view
-		returns (uint8)
+		returns (uint32)
 	{
 		require(false, stub_error);
 		contractAddress;
@@ -173,7 +176,14 @@
 		return 0;
 	}
 
-	// Selector: setSponsoringRateLimit(address,uint32) 77b6c908
+	/// Set contract sponsoring rate limit
+	/// @dev Sponsoring rate limit - is a minimum amount of blocks that should
+	///  pass between two sponsored transactions
+	/// @param contractAddress Contract to change sponsoring rate limit of
+	/// @param rateLimit Target rate limit
+	/// @dev Only contract owner can change this setting
+	/// @dev EVM selector for this function is: 0x77b6c908,
+	///  or in textual repr: setSponsoringRateLimit(address,uint32)
 	function setSponsoringRateLimit(address contractAddress, uint32 rateLimit)
 		public
 	{
@@ -183,32 +193,53 @@
 		dummy = 0;
 	}
 
-	// Selector: getSponsoringRateLimit(address) 610cfabd
-	function getSponsoringRateLimit(address contractAddress)
+	/// Is specified user present in contract allow list
+	/// @dev Contract owner always implicitly included
+	/// @param contractAddress Contract to check allowlist of
+	/// @param user User to check
+	/// @return bool Is specified users exists in contract allowlist
+	/// @dev EVM selector for this function is: 0x5c658165,
+	///  or in textual repr: allowed(address,address)
+	function allowed(address contractAddress, address user)
 		public
 		view
-		returns (uint32)
+		returns (bool)
 	{
 		require(false, stub_error);
 		contractAddress;
+		user;
 		dummy;
-		return 0;
+		return false;
 	}
 
-	// Selector: allowed(address,address) 5c658165
-	function allowed(address contractAddress, address user)
-		public
-		view
-		returns (bool)
-	{
+	/// Toggle user presence in contract allowlist
+	/// @param contractAddress Contract to change allowlist of
+	/// @param user Which user presence should be toggled
+	/// @param isAllowed `true` if user should be allowed to be sponsored
+	///  or call this contract, `false` otherwise
+	/// @dev Only contract owner can change this setting
+	/// @dev EVM selector for this function is: 0x4706cc1c,
+	///  or in textual repr: toggleAllowed(address,address,bool)
+	function toggleAllowed(
+		address contractAddress,
+		address user,
+		bool isAllowed
+	) public {
 		require(false, stub_error);
 		contractAddress;
 		user;
-		dummy;
-		return false;
+		isAllowed;
+		dummy = 0;
 	}
 
-	// Selector: allowlistEnabled(address) c772ef6c
+	/// Is this contract has allowlist access enabled
+	/// @dev Allowlist always can have users, and it is used for two purposes:
+	///  in case of allowlist sponsoring mode, users will be sponsored if they exist in allowlist
+	///  in case of allowlist access enabled, only users from allowlist may call this contract
+	/// @param contractAddress Contract to get allowlist access of
+	/// @return bool Is specified contract has allowlist access enabled
+	/// @dev EVM selector for this function is: 0xc772ef6c,
+	///  or in textual repr: allowlistEnabled(address)
 	function allowlistEnabled(address contractAddress)
 		public
 		view
@@ -220,24 +251,21 @@
 		return false;
 	}
 
-	// Selector: toggleAllowlist(address,bool) 36de20f5
+	/// Toggle contract allowlist access
+	/// @param contractAddress Contract to change allowlist access of
+	/// @param enabled Should allowlist access to be enabled?
+	/// @dev EVM selector for this function is: 0x36de20f5,
+	///  or in textual repr: toggleAllowlist(address,bool)
 	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;
-	}
+/// @dev anonymous struct
+struct Tuple0 {
+	address field_0;
+	uint256 field_1;
 }

--- a/pallets/evm-migration/src/benchmarking.rs
+++ b/pallets/evm-migration/src/benchmarking.rs
@@ -14,6 +14,8 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+#![allow(missing_docs)]
+
 use super::{Call, Config, Pallet};
 use frame_benchmarking::benchmarks;
 use frame_system::RawOrigin;

--- a/pallets/evm-migration/src/lib.rs
+++ b/pallets/evm-migration/src/lib.rs
@@ -14,7 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+#![doc = include_str!("../README.md")]
 #![cfg_attr(not(feature = "std"), no_std)]
+#![deny(missing_docs)]
 
 pub use pallet::*;
 #[cfg(feature = "runtime-benchmarks")]
@@ -32,6 +34,7 @@
 
 	#[pallet::config]
 	pub trait Config: frame_system::Config + pallet_evm::Config {
+		/// Weights
 		type WeightInfo: WeightInfo;
 	}
 
@@ -43,7 +46,9 @@
 
 	#[pallet::error]
 	pub enum Error<T> {
+		/// Can only migrate to empty address.
 		AccountNotEmpty,
+		/// Migration of this account is not yet started, or already finished.
 		AccountIsNotMigrating,
 	}
 
@@ -53,6 +58,8 @@
 
 	#[pallet::call]
 	impl<T: Config> Pallet<T> {
+		/// Start contract migration, inserts contract stub at target address,
+		/// and marks account as pending, allowing to insert storage
 		#[pallet::weight(<SelfWeightOf<T>>::begin())]
 		pub fn begin(origin: OriginFor<T>, address: H160) -> DispatchResult {
 			ensure_root(origin)?;
@@ -65,6 +72,8 @@
 			Ok(())
 		}
 
+		/// Insert items into contract storage, this method can be called
+		/// multiple times
 		#[pallet::weight(<SelfWeightOf<T>>::set_data(data.len() as u32))]
 		pub fn set_data(
 			origin: OriginFor<T>,
@@ -83,6 +92,9 @@
 			Ok(())
 		}
 
+		/// Finish contract migration, allows it to be called.
+		/// It is not possible to alter contract storage via [`Self::set_data`]
+		/// after this call.
 		#[pallet::weight(<SelfWeightOf<T>>::finish(code.len() as u32))]
 		pub fn finish(origin: OriginFor<T>, address: H160, code: Vec<u8>) -> DispatchResult {
 			ensure_root(origin)?;
@@ -97,6 +109,7 @@
 		}
 	}
 
+	/// Implements [`pallet_evm::OnMethodCall`], which reserves accounts with pending migration
 	pub struct OnMethodCall<T>(PhantomData<T>);
 	impl<T: Config> pallet_evm::OnMethodCall<T> for OnMethodCall<T> {
 		fn is_reserved(contract: &H160) -> bool {

--- a/pallets/evm-migration/src/weights.rs
+++ b/pallets/evm-migration/src/weights.rs
@@ -26,6 +26,7 @@
 #![cfg_attr(rustfmt, rustfmt_skip)]
 #![allow(unused_parens)]
 #![allow(unused_imports)]
+#![allow(missing_docs)]
 #![allow(clippy::unnecessary_cast)]
 
 use frame_support::{traits::Get, weights::{Weight, constants::RocksDbWeight}};

--- a/pallets/evm-transaction-payment/src/lib.rs
+++ b/pallets/evm-transaction-payment/src/lib.rs
@@ -14,7 +14,9 @@
 // You should have received a copy of the GNU General Public License
 // along with Unique Network. If not, see <http://www.gnu.org/licenses/>.
 
+#![doc = include_str!("../README.md")]
 #![cfg_attr(not(feature = "std"), no_std)]
+#![deny(missing_docs)]
 
 use core::marker::PhantomData;
 use fp_evm::WithdrawReason;
@@ -29,13 +31,12 @@
 pub mod pallet {
 	use super::*;
 
-	use frame_support::traits::Currency;
 	use sp_std::vec::Vec;
 
 	#[pallet::config]
 	pub trait Config: frame_system::Config + pallet_evm::account::Config {
+		/// Loosly-coupled handlers for evm call sponsoring
 		type EvmSponsorshipHandler: SponsorshipHandler<Self::CrossAccountId, (H160, Vec<u8>)>;
-		type Currency: Currency<Self::AccountId>;
 	}
 
 	#[pallet::pallet]
@@ -43,6 +44,7 @@
 	pub struct Pallet<T>(_);
 }
 
+/// Implements [`fp_evm::TransactionValidityHack`], which provides sponsor address to pallet-evm
 pub struct TransactionValidityHack<T: Config>(PhantomData<*const T>);
 impl<T: Config> fp_evm::TransactionValidityHack<T::CrossAccountId> for TransactionValidityHack<T> {
 	fn who_pays_fee(origin: H160, reason: &WithdrawReason) -> Option<T::CrossAccountId> {

--- a/pallets/fungible/src/erc.rs
+++ b/pallets/fungible/src/erc.rs
@@ -50,7 +50,7 @@
 	},
 }
 
-#[solidity_interface(name = "ERC20", events(ERC20Events))]
+#[solidity_interface(name = ERC20, events(ERC20Events))]
 impl<T: Config> FungibleHandle<T> {
 	fn name(&self) -> Result<string> {
 		Ok(decode_utf16(self.name.iter().copied())
@@ -129,7 +129,7 @@
 	}
 }
 
-#[solidity_interface(name = "ERC20UniqueExtensions")]
+#[solidity_interface(name = ERC20UniqueExtensions)]
 impl<T: Config> FungibleHandle<T> {
 	#[weight(<SelfWeightOf<T>>::burn_from())]
 	fn burn_from(&mut self, caller: caller, from: address, amount: uint256) -> Result<bool> {
@@ -147,11 +147,11 @@
 }
 
 #[solidity_interface(
-	name = "UniqueFungible",
+	name = UniqueFungible,
 	is(
 		ERC20,
 		ERC20UniqueExtensions,
-		via("CollectionHandle<T>", common_mut, Collection)
+		Collection(common_mut, CollectionHandle<T>),
 	)
 )]
 impl<T: Config> FungibleHandle<T> where T::AccountId: From<[u8; 32]> {}

binary blob — no preview

--- a/pallets/fungible/src/stubs/UniqueFungible.sol
+++ b/pallets/fungible/src/stubs/UniqueFungible.sol
@@ -3,7 +3,7 @@
 
 pragma solidity >=0.8.0 <0.9.0;
 
-// Common stubs holder
+/// @dev common stubs holder
 contract Dummy {
 	uint8 dummy;
 	string stub_error = "this contract is implemented in native";
@@ -19,122 +19,17 @@
 		interfaceID;
 		return true;
 	}
-}
-
-// Inline
-contract ERC20Events {
-	event Transfer(address indexed from, address indexed to, uint256 value);
-	event Approval(
-		address indexed owner,
-		address indexed spender,
-		uint256 value
-	);
 }
 
-// Selector: 79cc6790
-contract ERC20UniqueExtensions is Dummy, ERC165 {
-	// Selector: burnFrom(address,uint256) 79cc6790
-	function burnFrom(address from, uint256 amount) public returns (bool) {
-		require(false, stub_error);
-		from;
-		amount;
-		dummy = 0;
-		return false;
-	}
-}
-
-// Selector: 942e8b22
-contract ERC20 is Dummy, ERC165, ERC20Events {
-	// Selector: name() 06fdde03
-	function name() public view returns (string memory) {
-		require(false, stub_error);
-		dummy;
-		return "";
-	}
-
-	// Selector: symbol() 95d89b41
-	function symbol() public view returns (string memory) {
-		require(false, stub_error);
-		dummy;
-		return "";
-	}
-
-	// Selector: totalSupply() 18160ddd
-	function totalSupply() public view returns (uint256) {
-		require(false, stub_error);
-		dummy;
-		return 0;
-	}
-
-	// Selector: decimals() 313ce567
-	function decimals() public view returns (uint8) {
-		require(false, stub_error);
-		dummy;
-		return 0;
-	}
-
-	// Selector: balanceOf(address) 70a08231
-	function balanceOf(address owner) public view returns (uint256) {
-		require(false, stub_error);
-		owner;
-		dummy;
-		return 0;
-	}
-
-	// Selector: transfer(address,uint256) a9059cbb
-	function transfer(address to, uint256 amount) public returns (bool) {
-		require(false, stub_error);
-		to;
-		amount;
-		dummy = 0;
-		return false;
-	}
-
-	// Selector: transferFrom(address,address,uint256) 23b872dd
-	function transferFrom(
-		address from,
-		address to,
-		uint256 amount
-	) public returns (bool) {
-		require(false, stub_error);
-		from;
-		to;
-		amount;
-		dummy = 0;
-		return false;
-	}
-
-	// Selector: approve(address,uint256) 095ea7b3
-	function approve(address spender, uint256 amount) public returns (bool) {
-		require(false, stub_error);
-		spender;
-		amount;
-		dummy = 0;
-		return false;
-	}
-
-	// Selector: allowance(address,address) dd62ed3e
-	function allowance(address owner, address spender)
-		public
-		view
-		returns (uint256)
-	{
-		require(false, stub_error);
-		owner;
-		spender;
-		dummy;
-		return 0;
-	}
-}
-
-// Selector: ffe4da23
+/// @title A contract that allows you to work with collections.
+/// @dev the ERC-165 identifier for this interface is 0xffe4da23
 contract Collection is Dummy, ERC165 {
-	// Set collection property.
-	//
-	// @param key Property key.
-	// @param value Propery value.
-	//
-	// Selector: setCollectionProperty(string,bytes) 2f073f66
+	/// Set collection property.
+	///
+	/// @param key Property key.
+	/// @param value Propery value.
+	/// @dev EVM selector for this function is: 0x2f073f66,
+	///  or in textual repr: setCollectionProperty(string,bytes)
 	function setCollectionProperty(string memory key, bytes memory value)
 		public
 	{
@@ -144,25 +39,25 @@
 		dummy = 0;
 	}
 
-	// Delete collection property.
-	//
-	// @param key Property key.
-	//
-	// Selector: deleteCollectionProperty(string) 7b7debce
+	/// Delete collection property.
+	///
+	/// @param key Property key.
+	/// @dev EVM selector for this function is: 0x7b7debce,
+	///  or in textual repr: deleteCollectionProperty(string)
 	function deleteCollectionProperty(string memory key) public {
 		require(false, stub_error);
 		key;
 		dummy = 0;
 	}
 
-	// Get collection property.
-	//
-	// @dev Throws error if key not found.
-	//
-	// @param key Property key.
-	// @return bytes The property corresponding to the key.
-	//
-	// Selector: collectionProperty(string) cf24fd6d
+	/// Get collection property.
+	///
+	/// @dev Throws error if key not found.
+	///
+	/// @param key Property key.
+	/// @return bytes The property corresponding to the key.
+	/// @dev EVM selector for this function is: 0xcf24fd6d,
+	///  or in textual repr: collectionProperty(string)
 	function collectionProperty(string memory key)
 		public
 		view
@@ -174,41 +69,41 @@
 		return hex"";
 	}
 
-	// Set the sponsor of the collection.
-	//
-	// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	//
-	// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
-	//
-	// Selector: setCollectionSponsor(address) 7623402e
+	/// Set the sponsor of the collection.
+	///
+	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
+	///
+	/// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
+	/// @dev EVM selector for this function is: 0x7623402e,
+	///  or in textual repr: setCollectionSponsor(address)
 	function setCollectionSponsor(address sponsor) public {
 		require(false, stub_error);
 		sponsor;
 		dummy = 0;
 	}
 
-	// Collection sponsorship confirmation.
-	//
-	// @dev After setting the sponsor for the collection, it must be confirmed with this function.
-	//
-	// Selector: confirmCollectionSponsorship() 3c50e97a
+	/// Collection sponsorship confirmation.
+	///
+	/// @dev After setting the sponsor for the collection, it must be confirmed with this function.
+	/// @dev EVM selector for this function is: 0x3c50e97a,
+	///  or in textual repr: confirmCollectionSponsorship()
 	function confirmCollectionSponsorship() public {
 		require(false, stub_error);
 		dummy = 0;
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"accountTokenOwnershipLimit",
-	// 	"sponsoredDataSize",
-	// 	"sponsoredDataRateLimit",
-	// 	"tokenLimit",
-	// 	"sponsorTransferTimeout",
-	// 	"sponsorApproveTimeout"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,uint32) 6a3841db
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"accountTokenOwnershipLimit",
+	/// 	"sponsoredDataSize",
+	/// 	"sponsoredDataRateLimit",
+	/// 	"tokenLimit",
+	/// 	"sponsorTransferTimeout",
+	/// 	"sponsorApproveTimeout"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x6a3841db,
+	///  or in textual repr: setCollectionLimit(string,uint32)
 	function setCollectionLimit(string memory limit, uint32 value) public {
 		require(false, stub_error);
 		limit;
@@ -216,15 +111,15 @@
 		dummy = 0;
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"ownerCanTransfer",
-	// 	"ownerCanDestroy",
-	// 	"transfersEnabled"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,bool) 993b7fba
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"ownerCanTransfer",
+	/// 	"ownerCanDestroy",
+	/// 	"transfersEnabled"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x993b7fba,
+	///  or in textual repr: setCollectionLimit(string,bool)
 	function setCollectionLimit(string memory limit, bool value) public {
 		require(false, stub_error);
 		limit;
@@ -232,73 +127,73 @@
 		dummy = 0;
 	}
 
-	// Get contract address.
-	//
-	// Selector: contractAddress() f6b4dfb4
+	/// Get contract address.
+	/// @dev EVM selector for this function is: 0xf6b4dfb4,
+	///  or in textual repr: contractAddress()
 	function contractAddress() public view returns (address) {
 		require(false, stub_error);
 		dummy;
 		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Add collection admin by substrate address.
-	// @param new_admin Substrate administrator address.
-	//
-	// Selector: addCollectionAdminSubstrate(uint256) 5730062b
+	/// Add collection admin by substrate address.
+	/// @param newAdmin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x5730062b,
+	///  or in textual repr: addCollectionAdminSubstrate(uint256)
 	function addCollectionAdminSubstrate(uint256 newAdmin) public {
 		require(false, stub_error);
 		newAdmin;
 		dummy = 0;
 	}
 
-	// Remove collection admin by substrate address.
-	// @param admin Substrate administrator address.
-	//
-	// Selector: removeCollectionAdminSubstrate(uint256) 4048fcf9
+	/// Remove collection admin by substrate address.
+	/// @param admin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x4048fcf9,
+	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
 	function removeCollectionAdminSubstrate(uint256 admin) public {
 		require(false, stub_error);
 		admin;
 		dummy = 0;
 	}
 
-	// Add collection admin.
-	// @param new_admin Address of the added administrator.
-	//
-	// Selector: addCollectionAdmin(address) 92e462c7
+	/// Add collection admin.
+	/// @param newAdmin Address of the added administrator.
+	/// @dev EVM selector for this function is: 0x92e462c7,
+	///  or in textual repr: addCollectionAdmin(address)
 	function addCollectionAdmin(address newAdmin) public {
 		require(false, stub_error);
 		newAdmin;
 		dummy = 0;
 	}
 
-	// Remove collection admin.
-	//
-	// @param new_admin Address of the removed administrator.
-	//
-	// Selector: removeCollectionAdmin(address) fafd7b42
+	/// Remove collection admin.
+	///
+	/// @param admin Address of the removed administrator.
+	/// @dev EVM selector for this function is: 0xfafd7b42,
+	///  or in textual repr: removeCollectionAdmin(address)
 	function removeCollectionAdmin(address admin) public {
 		require(false, stub_error);
 		admin;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
-	//
-	// Selector: setCollectionNesting(bool) 112d4586
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
+	/// @dev EVM selector for this function is: 0x112d4586,
+	///  or in textual repr: setCollectionNesting(bool)
 	function setCollectionNesting(bool enable) public {
 		require(false, stub_error);
 		enable;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
-	// @param collections Addresses of collections that will be available for nesting.
-	//
-	// Selector: setCollectionNesting(bool,address[]) 64872396
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
+	/// @param collections Addresses of collections that will be available for nesting.
+	/// @dev EVM selector for this function is: 0x64872396,
+	///  or in textual repr: setCollectionNesting(bool,address[])
 	function setCollectionNesting(bool enable, address[] memory collections)
 		public
 	{
@@ -308,57 +203,57 @@
 		dummy = 0;
 	}
 
-	// Set the collection access method.
-	// @param mode Access mode
-	// 	0 for Normal
-	// 	1 for AllowList
-	//
-	// Selector: setCollectionAccess(uint8) 41835d4c
+	/// Set the collection access method.
+	/// @param mode Access mode
+	/// 	0 for Normal
+	/// 	1 for AllowList
+	/// @dev EVM selector for this function is: 0x41835d4c,
+	///  or in textual repr: setCollectionAccess(uint8)
 	function setCollectionAccess(uint8 mode) public {
 		require(false, stub_error);
 		mode;
 		dummy = 0;
 	}
 
-	// Add the user to the allowed list.
-	//
-	// @param user Address of a trusted user.
-	//
-	// Selector: addToCollectionAllowList(address) 67844fe6
+	/// Add the user to the allowed list.
+	///
+	/// @param user Address of a trusted user.
+	/// @dev EVM selector for this function is: 0x67844fe6,
+	///  or in textual repr: addToCollectionAllowList(address)
 	function addToCollectionAllowList(address user) public {
 		require(false, stub_error);
 		user;
 		dummy = 0;
 	}
 
-	// Remove the user from the allowed list.
-	//
-	// @param user Address of a removed user.
-	//
-	// Selector: removeFromCollectionAllowList(address) 85c51acb
+	/// Remove the user from the allowed list.
+	///
+	/// @param user Address of a removed user.
+	/// @dev EVM selector for this function is: 0x85c51acb,
+	///  or in textual repr: removeFromCollectionAllowList(address)
 	function removeFromCollectionAllowList(address user) public {
 		require(false, stub_error);
 		user;
 		dummy = 0;
 	}
 
-	// Switch permission for minting.
-	//
-	// @param mode Enable if "true".
-	//
-	// Selector: setCollectionMintMode(bool) 00018e84
+	/// Switch permission for minting.
+	///
+	/// @param mode Enable if "true".
+	/// @dev EVM selector for this function is: 0x00018e84,
+	///  or in textual repr: setCollectionMintMode(bool)
 	function setCollectionMintMode(bool mode) public {
 		require(false, stub_error);
 		mode;
 		dummy = 0;
 	}
 
-	// Check that account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdmin(address) 9811b0c7
+	/// Check that account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x9811b0c7,
+	///  or in textual repr: isOwnerOrAdmin(address)
 	function isOwnerOrAdmin(address user) public view returns (bool) {
 		require(false, stub_error);
 		user;
@@ -366,12 +261,12 @@
 		return false;
 	}
 
-	// Check that substrate account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdminSubstrate(uint256) 68910e00
+	/// Check that substrate account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x68910e00,
+	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
 	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
 		require(false, stub_error);
 		user;
@@ -379,35 +274,35 @@
 		return false;
 	}
 
-	// Returns collection type
-	//
-	// @return `Fungible` or `NFT` or `ReFungible`
-	//
-	// Selector: uniqueCollectionType() d34b55b8
+	/// Returns collection type
+	///
+	/// @return `Fungible` or `NFT` or `ReFungible`
+	/// @dev EVM selector for this function is: 0xd34b55b8,
+	///  or in textual repr: uniqueCollectionType()
 	function uniqueCollectionType() public returns (string memory) {
 		require(false, stub_error);
 		dummy = 0;
 		return "";
 	}
 
-	// Changes collection owner to another account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner account
-	//
-	// Selector: setOwner(address) 13af4035
+	/// Changes collection owner to another account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner account
+	/// @dev EVM selector for this function is: 0x13af4035,
+	///  or in textual repr: setOwner(address)
 	function setOwner(address newOwner) public {
 		require(false, stub_error);
 		newOwner;
 		dummy = 0;
 	}
 
-	// Changes collection owner to another substrate account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner substrate account
-	//
-	// Selector: setOwnerSubstrate(uint256) b212138f
+	/// Changes collection owner to another substrate account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner substrate account
+	/// @dev EVM selector for this function is: 0xb212138f,
+	///  or in textual repr: setOwnerSubstrate(uint256)
 	function setOwnerSubstrate(uint256 newOwner) public {
 		require(false, stub_error);
 		newOwner;
@@ -415,6 +310,122 @@
 	}
 }
 
+/// @dev the ERC-165 identifier for this interface is 0x79cc6790
+contract ERC20UniqueExtensions is Dummy, ERC165 {
+	/// @dev EVM selector for this function is: 0x79cc6790,
+	///  or in textual repr: burnFrom(address,uint256)
+	function burnFrom(address from, uint256 amount) public returns (bool) {
+		require(false, stub_error);
+		from;
+		amount;
+		dummy = 0;
+		return false;
+	}
+}
+
+/// @dev inlined interface
+contract ERC20Events {
+	event Transfer(address indexed from, address indexed to, uint256 value);
+	event Approval(
+		address indexed owner,
+		address indexed spender,
+		uint256 value
+	);
+}
+
+/// @dev the ERC-165 identifier for this interface is 0x942e8b22
+contract ERC20 is Dummy, ERC165, ERC20Events {
+	/// @dev EVM selector for this function is: 0x06fdde03,
+	///  or in textual repr: name()
+	function name() public view returns (string memory) {
+		require(false, stub_error);
+		dummy;
+		return "";
+	}
+
+	/// @dev EVM selector for this function is: 0x95d89b41,
+	///  or in textual repr: symbol()
+	function symbol() public view returns (string memory) {
+		require(false, stub_error);
+		dummy;
+		return "";
+	}
+
+	/// @dev EVM selector for this function is: 0x18160ddd,
+	///  or in textual repr: totalSupply()
+	function totalSupply() public view returns (uint256) {
+		require(false, stub_error);
+		dummy;
+		return 0;
+	}
+
+	/// @dev EVM selector for this function is: 0x313ce567,
+	///  or in textual repr: decimals()
+	function decimals() public view returns (uint8) {
+		require(false, stub_error);
+		dummy;
+		return 0;
+	}
+
+	/// @dev EVM selector for this function is: 0x70a08231,
+	///  or in textual repr: balanceOf(address)
+	function balanceOf(address owner) public view returns (uint256) {
+		require(false, stub_error);
+		owner;
+		dummy;
+		return 0;
+	}
+
+	/// @dev EVM selector for this function is: 0xa9059cbb,
+	///  or in textual repr: transfer(address,uint256)
+	function transfer(address to, uint256 amount) public returns (bool) {
+		require(false, stub_error);
+		to;
+		amount;
+		dummy = 0;
+		return false;
+	}
+
+	/// @dev EVM selector for this function is: 0x23b872dd,
+	///  or in textual repr: transferFrom(address,address,uint256)
+	function transferFrom(
+		address from,
+		address to,
+		uint256 amount
+	) public returns (bool) {
+		require(false, stub_error);
+		from;
+		to;
+		amount;
+		dummy = 0;
+		return false;
+	}
+
+	/// @dev EVM selector for this function is: 0x095ea7b3,
+	///  or in textual repr: approve(address,uint256)
+	function approve(address spender, uint256 amount) public returns (bool) {
+		require(false, stub_error);
+		spender;
+		amount;
+		dummy = 0;
+		return false;
+	}
+
+	/// @dev EVM selector for this function is: 0xdd62ed3e,
+	///  or in textual repr: allowance(address,address)
+	function allowance(address owner, address spender)
+		public
+		view
+		returns (uint256)
+	{
+		require(false, stub_error);
+		owner;
+		spender;
+		dummy;
+		return 0;
+	}
+}
+
 contract UniqueFungible is
 	Dummy,
 	ERC165,

--- a/pallets/nonfungible/src/erc.rs
+++ b/pallets/nonfungible/src/erc.rs
@@ -50,14 +50,14 @@
 };
 
 /// @title A contract that allows to set and delete token properties and change token property permissions.
-#[solidity_interface(name = "TokenProperties")]
+#[solidity_interface(name = TokenProperties)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Set permissions for token property.
 	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.
 	/// @param key Property key.
-	/// @param is_mutable Permission to mutate property.
-	/// @param collection_admin Permission to mutate property by collection admin if property is mutable.
-	/// @param token_owner Permission to mutate property by token owner if property is mutable.
+	/// @param isMutable Permission to mutate property.
+	/// @param collectionAdmin Permission to mutate property by collection admin if property is mutable.
+	/// @param tokenOwner Permission to mutate property by token owner if property is mutable.
 	fn set_token_property_permission(
 		&mut self,
 		caller: caller,
@@ -201,7 +201,7 @@
 
 /// @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 /// @dev See https://eips.ethereum.org/EIPS/eip-721
-#[solidity_interface(name = "ERC721Metadata")]
+#[solidity_interface(name = ERC721Metadata, expect_selector = 0x5b5e139f)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice A descriptive name for a collection of NFTs in this contract
 	fn name(&self) -> Result<string> {
@@ -262,7 +262,7 @@
 
 /// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 /// @dev See https://eips.ethereum.org/EIPS/eip-721
-#[solidity_interface(name = "ERC721Enumerable")]
+#[solidity_interface(name = ERC721Enumerable, expect_selector = 0x780e9d63)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Enumerate valid NFTs
 	/// @param index A counter less than `totalSupply()`
@@ -289,7 +289,7 @@
 
 /// @title ERC-721 Non-Fungible Token Standard
 /// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-#[solidity_interface(name = "ERC721", events(ERC721Events))]
+#[solidity_interface(name = ERC721, events(ERC721Events), expect_selector = 0x80ac58cd)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Count all NFTs assigned to an owner
 	/// @dev NFTs assigned to the zero address are considered invalid, and this
@@ -316,13 +316,13 @@
 			.as_eth())
 	}
 	/// @dev Not implemented
+	#[solidity(rename_selector = "safeTransferFrom")]
 	fn safe_transfer_from_with_data(
 		&mut self,
 		_from: address,
 		_to: address,
 		_token_id: uint256,
 		_data: bytes,
-		_value: value,
 	) -> Result<void> {
 		// TODO: Not implemetable
 		Err("not implemented".into())
@@ -333,7 +333,6 @@
 		_from: address,
 		_to: address,
 		_token_id: uint256,
-		_value: value,
 	) -> Result<void> {
 		// TODO: Not implemetable
 		Err("not implemented".into())
@@ -348,7 +347,6 @@
 	/// @param from The current owner of the NFT
 	/// @param to The new owner
 	/// @param tokenId The NFT to transfer
-	/// @param _value Not used for an NFT
 	#[weight(<SelfWeightOf<T>>::transfer_from())]
 	fn transfer_from(
 		&mut self,
@@ -356,7 +354,6 @@
 		from: address,
 		to: address,
 		token_id: uint256,
-		_value: value,
 	) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let from = T::CrossAccountId::from_eth(from);
@@ -378,13 +375,7 @@
 	/// @param approved The new approved NFT controller
 	/// @param tokenId The NFT to approve
 	#[weight(<SelfWeightOf<T>>::approve())]
-	fn approve(
-		&mut self,
-		caller: caller,
-		approved: address,
-		token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn approve(&mut self, caller: caller, approved: address, token_id: uint256) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let approved = T::CrossAccountId::from_eth(approved);
 		let token = token_id.try_into()?;
@@ -419,7 +410,7 @@
 }
 
 /// @title ERC721 Token that can be irreversibly burned (destroyed).
-#[solidity_interface(name = "ERC721Burnable")]
+#[solidity_interface(name = ERC721Burnable)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Burns a specific ERC721 token.
 	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
@@ -436,7 +427,7 @@
 }
 
 /// @title ERC721 minting logic.
-#[solidity_interface(name = "ERC721Mintable", events(ERC721MintableEvents))]
+#[solidity_interface(name = ERC721Mintable, events(ERC721MintableEvents))]
 impl<T: Config> NonfungibleHandle<T> {
 	fn minting_finished(&self) -> Result<bool> {
 		Ok(false)
@@ -597,22 +588,15 @@
 }
 
 /// @title Unique extensions for ERC721.
-#[solidity_interface(name = "ERC721UniqueExtensions")]
+#[solidity_interface(name = ERC721UniqueExtensions)]
 impl<T: Config> NonfungibleHandle<T> {
 	/// @notice Transfer ownership of an NFT
 	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
 	///  is the zero address. Throws if `tokenId` is not a valid NFT.
 	/// @param to The new owner
 	/// @param tokenId The NFT to transfer
-	/// @param _value Not used for an NFT
 	#[weight(<SelfWeightOf<T>>::transfer())]
-	fn transfer(
-		&mut self,
-		caller: caller,
-		to: address,
-		token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn transfer(&mut self, caller: caller, to: address, token_id: uint256) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let to = T::CrossAccountId::from_eth(to);
 		let token = token_id.try_into()?;
@@ -630,15 +614,8 @@
 	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.
 	/// @param from The current owner of the NFT
 	/// @param tokenId The NFT to transfer
-	/// @param _value Not used for an NFT
 	#[weight(<SelfWeightOf<T>>::burn_from())]
-	fn burn_from(
-		&mut self,
-		caller: caller,
-		from: address,
-		token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn burn_from(&mut self, caller: caller, from: address, token_id: uint256) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let from = T::CrossAccountId::from_eth(from);
 		let token = token_id.try_into()?;
@@ -751,7 +728,7 @@
 }
 
 #[solidity_interface(
-	name = "UniqueNFT",
+	name = UniqueNFT,
 	is(
 		ERC721,
 		ERC721Metadata,
@@ -759,7 +736,7 @@
 		ERC721UniqueExtensions,
 		ERC721Mintable,
 		ERC721Burnable,
-		via("CollectionHandle<T>", common_mut, Collection),
+		Collection(common_mut, CollectionHandle<T>),
 		TokenProperties,
 	)
 )]

binary blob — no preview

--- a/pallets/nonfungible/src/stubs/UniqueNFT.sol
+++ b/pallets/nonfungible/src/stubs/UniqueNFT.sol
@@ -3,13 +3,7 @@
 
 pragma solidity >=0.8.0 <0.9.0;
 
-// Anonymous struct
-struct Tuple0 {
-	uint256 field_0;
-	string field_1;
-}
-
-// Common stubs holder
+/// @dev common stubs holder
 contract Dummy {
 	uint8 dummy;
 	string stub_error = "this contract is implemented in native";
@@ -27,40 +21,17 @@
 	}
 }
 
-// Inline
-contract ERC721Events {
-	event Transfer(
-		address indexed from,
-		address indexed to,
-		uint256 indexed tokenId
-	);
-	event Approval(
-		address indexed owner,
-		address indexed approved,
-		uint256 indexed tokenId
-	);
-	event ApprovalForAll(
-		address indexed owner,
-		address indexed operator,
-		bool approved
-	);
-}
-
-// Inline
-contract ERC721MintableEvents {
-	event MintingFinished();
-}
-
-// Selector: 41369377
+/// @title A contract that allows to set and delete token properties and change token property permissions.
+/// @dev the ERC-165 identifier for this interface is 0x41369377
 contract TokenProperties is Dummy, ERC165 {
-	// @notice Set permissions for token property.
-	// @dev Throws error if `msg.sender` is not admin or owner of the collection.
-	// @param key Property key.
-	// @param is_mutable Permission to mutate property.
-	// @param collection_admin Permission to mutate property by collection admin if property is mutable.
-	// @param token_owner Permission to mutate property by token owner if property is mutable.
-	//
-	// Selector: setTokenPropertyPermission(string,bool,bool,bool) 222d97fa
+	/// @notice Set permissions for token property.
+	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.
+	/// @param key Property key.
+	/// @param isMutable Permission to mutate property.
+	/// @param collectionAdmin Permission to mutate property by collection admin if property is mutable.
+	/// @param tokenOwner Permission to mutate property by token owner if property is mutable.
+	/// @dev EVM selector for this function is: 0x222d97fa,
+	///  or in textual repr: setTokenPropertyPermission(string,bool,bool,bool)
 	function setTokenPropertyPermission(
 		string memory key,
 		bool isMutable,
@@ -75,13 +46,13 @@
 		dummy = 0;
 	}
 
-	// @notice Set token property value.
-	// @dev Throws error if `msg.sender` has no permission to edit the property.
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	// @param value Property value.
-	//
-	// Selector: setProperty(uint256,string,bytes) 1752d67b
+	/// @notice Set token property value.
+	/// @dev Throws error if `msg.sender` has no permission to edit the property.
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @param value Property value.
+	/// @dev EVM selector for this function is: 0x1752d67b,
+	///  or in textual repr: setProperty(uint256,string,bytes)
 	function setProperty(
 		uint256 tokenId,
 		string memory key,
@@ -94,12 +65,12 @@
 		dummy = 0;
 	}
 
-	// @notice Delete token property value.
-	// @dev Throws error if `msg.sender` has no permission to edit the property.
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	//
-	// Selector: deleteProperty(uint256,string) 066111d1
+	/// @notice Delete token property value.
+	/// @dev Throws error if `msg.sender` has no permission to edit the property.
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @dev EVM selector for this function is: 0x066111d1,
+	///  or in textual repr: deleteProperty(uint256,string)
 	function deleteProperty(uint256 tokenId, string memory key) public {
 		require(false, stub_error);
 		tokenId;
@@ -107,13 +78,13 @@
 		dummy = 0;
 	}
 
-	// @notice Get token property value.
-	// @dev Throws error if key not found
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	// @return Property value bytes
-	//
-	// Selector: property(uint256,string) 7228c327
+	/// @notice Get token property value.
+	/// @dev Throws error if key not found
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @return Property value bytes
+	/// @dev EVM selector for this function is: 0x7228c327,
+	///  or in textual repr: property(uint256,string)
 	function property(uint256 tokenId, string memory key)
 		public
 		view
@@ -127,213 +98,334 @@
 	}
 }
 
-// Selector: 42966c68
-contract ERC721Burnable is Dummy, ERC165 {
-	// @notice Burns a specific ERC721 token.
-	// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-	//  operator of the current owner.
-	// @param tokenId The NFT to approve
-	//
-	// Selector: burn(uint256) 42966c68
-	function burn(uint256 tokenId) public {
+/// @title A contract that allows you to work with collections.
+/// @dev the ERC-165 identifier for this interface is 0xffe4da23
+contract Collection is Dummy, ERC165 {
+	/// Set collection property.
+	///
+	/// @param key Property key.
+	/// @param value Propery value.
+	/// @dev EVM selector for this function is: 0x2f073f66,
+	///  or in textual repr: setCollectionProperty(string,bytes)
+	function setCollectionProperty(string memory key, bytes memory value)
+		public
+	{
 		require(false, stub_error);
-		tokenId;
+		key;
+		value;
 		dummy = 0;
 	}
-}
 
-// Selector: 58800161
-contract ERC721 is Dummy, ERC165, ERC721Events {
-	// @notice Count all NFTs assigned to an owner
-	// @dev NFTs assigned to the zero address are considered invalid, and this
-	//  function throws for queries about the zero address.
-	// @param owner An address for whom to query the balance
-	// @return The number of NFTs owned by `owner`, possibly zero
-	//
-	// Selector: balanceOf(address) 70a08231
-	function balanceOf(address owner) public view returns (uint256) {
+	/// Delete collection property.
+	///
+	/// @param key Property key.
+	/// @dev EVM selector for this function is: 0x7b7debce,
+	///  or in textual repr: deleteCollectionProperty(string)
+	function deleteCollectionProperty(string memory key) public {
 		require(false, stub_error);
-		owner;
-		dummy;
-		return 0;
+		key;
+		dummy = 0;
 	}
 
-	// @notice Find the owner of an NFT
-	// @dev NFTs assigned to zero address are considered invalid, and queries
-	//  about them do throw.
-	// @param tokenId The identifier for an NFT
-	// @return The address of the owner of the NFT
-	//
-	// Selector: ownerOf(uint256) 6352211e
-	function ownerOf(uint256 tokenId) public view returns (address) {
+	/// Get collection property.
+	///
+	/// @dev Throws error if key not found.
+	///
+	/// @param key Property key.
+	/// @return bytes The property corresponding to the key.
+	/// @dev EVM selector for this function is: 0xcf24fd6d,
+	///  or in textual repr: collectionProperty(string)
+	function collectionProperty(string memory key)
+		public
+		view
+		returns (bytes memory)
+	{
 		require(false, stub_error);
-		tokenId;
+		key;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return hex"";
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: safeTransferFromWithData(address,address,uint256,bytes) 60a11672
-	function safeTransferFromWithData(
-		address from,
-		address to,
-		uint256 tokenId,
-		bytes memory data
-	) public {
+	/// Set the sponsor of the collection.
+	///
+	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
+	///
+	/// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
+	/// @dev EVM selector for this function is: 0x7623402e,
+	///  or in textual repr: setCollectionSponsor(address)
+	function setCollectionSponsor(address sponsor) public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
-		data;
+		sponsor;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: safeTransferFrom(address,address,uint256) 42842e0e
-	function safeTransferFrom(
-		address from,
-		address to,
-		uint256 tokenId
-	) public {
+	/// Collection sponsorship confirmation.
+	///
+	/// @dev After setting the sponsor for the collection, it must be confirmed with this function.
+	/// @dev EVM selector for this function is: 0x3c50e97a,
+	///  or in textual repr: confirmCollectionSponsorship()
+	function confirmCollectionSponsorship() public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
 		dummy = 0;
 	}
 
-	// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
-	//  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-	//  THEY MAY BE PERMANENTLY LOST
-	// @dev Throws unless `msg.sender` is the current owner or an authorized
-	//  operator for this NFT. Throws if `from` is not the current owner. Throws
-	//  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.
-	// @param from The current owner of the NFT
-	// @param to The new owner
-	// @param tokenId The NFT to transfer
-	// @param _value Not used for an NFT
-	//
-	// Selector: transferFrom(address,address,uint256) 23b872dd
-	function transferFrom(
-		address from,
-		address to,
-		uint256 tokenId
-	) public {
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"accountTokenOwnershipLimit",
+	/// 	"sponsoredDataSize",
+	/// 	"sponsoredDataRateLimit",
+	/// 	"tokenLimit",
+	/// 	"sponsorTransferTimeout",
+	/// 	"sponsorApproveTimeout"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x6a3841db,
+	///  or in textual repr: setCollectionLimit(string,uint32)
+	function setCollectionLimit(string memory limit, uint32 value) public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
+		limit;
+		value;
 		dummy = 0;
 	}
 
-	// @notice Set or reaffirm the approved address for an NFT
-	// @dev The zero address indicates there is no approved address.
-	// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
-	//  operator of the current owner.
-	// @param approved The new approved NFT controller
-	// @param tokenId The NFT to approve
-	//
-	// Selector: approve(address,uint256) 095ea7b3
-	function approve(address approved, uint256 tokenId) public {
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"ownerCanTransfer",
+	/// 	"ownerCanDestroy",
+	/// 	"transfersEnabled"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x993b7fba,
+	///  or in textual repr: setCollectionLimit(string,bool)
+	function setCollectionLimit(string memory limit, bool value) public {
 		require(false, stub_error);
-		approved;
-		tokenId;
+		limit;
+		value;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: setApprovalForAll(address,bool) a22cb465
-	function setApprovalForAll(address operator, bool approved) public {
+	/// Get contract address.
+	/// @dev EVM selector for this function is: 0xf6b4dfb4,
+	///  or in textual repr: contractAddress()
+	function contractAddress() public view returns (address) {
+		require(false, stub_error);
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
+	}
+
+	/// Add collection admin by substrate address.
+	/// @param newAdmin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x5730062b,
+	///  or in textual repr: addCollectionAdminSubstrate(uint256)
+	function addCollectionAdminSubstrate(uint256 newAdmin) public {
+		require(false, stub_error);
+		newAdmin;
+		dummy = 0;
+	}
+
+	/// Remove collection admin by substrate address.
+	/// @param admin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x4048fcf9,
+	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
+	function removeCollectionAdminSubstrate(uint256 admin) public {
+		require(false, stub_error);
+		admin;
+		dummy = 0;
+	}
+
+	/// Add collection admin.
+	/// @param newAdmin Address of the added administrator.
+	/// @dev EVM selector for this function is: 0x92e462c7,
+	///  or in textual repr: addCollectionAdmin(address)
+	function addCollectionAdmin(address newAdmin) public {
+		require(false, stub_error);
+		newAdmin;
+		dummy = 0;
+	}
+
+	/// Remove collection admin.
+	///
+	/// @param admin Address of the removed administrator.
+	/// @dev EVM selector for this function is: 0xfafd7b42,
+	///  or in textual repr: removeCollectionAdmin(address)
+	function removeCollectionAdmin(address admin) public {
 		require(false, stub_error);
-		operator;
-		approved;
+		admin;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: getApproved(uint256) 081812fc
-	function getApproved(uint256 tokenId) public view returns (address) {
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
+	/// @dev EVM selector for this function is: 0x112d4586,
+	///  or in textual repr: setCollectionNesting(bool)
+	function setCollectionNesting(bool enable) public {
 		require(false, stub_error);
-		tokenId;
-		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		enable;
+		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: isApprovedForAll(address,address) e985e9c5
-	function isApprovedForAll(address owner, address operator)
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
+	/// @param collections Addresses of collections that will be available for nesting.
+	/// @dev EVM selector for this function is: 0x64872396,
+	///  or in textual repr: setCollectionNesting(bool,address[])
+	function setCollectionNesting(bool enable, address[] memory collections)
 		public
-		view
-		returns (address)
 	{
 		require(false, stub_error);
-		owner;
-		operator;
+		enable;
+		collections;
+		dummy = 0;
+	}
+
+	/// Set the collection access method.
+	/// @param mode Access mode
+	/// 	0 for Normal
+	/// 	1 for AllowList
+	/// @dev EVM selector for this function is: 0x41835d4c,
+	///  or in textual repr: setCollectionAccess(uint8)
+	function setCollectionAccess(uint8 mode) public {
+		require(false, stub_error);
+		mode;
+		dummy = 0;
+	}
+
+	/// Add the user to the allowed list.
+	///
+	/// @param user Address of a trusted user.
+	/// @dev EVM selector for this function is: 0x67844fe6,
+	///  or in textual repr: addToCollectionAllowList(address)
+	function addToCollectionAllowList(address user) public {
+		require(false, stub_error);
+		user;
+		dummy = 0;
+	}
+
+	/// Remove the user from the allowed list.
+	///
+	/// @param user Address of a removed user.
+	/// @dev EVM selector for this function is: 0x85c51acb,
+	///  or in textual repr: removeFromCollectionAllowList(address)
+	function removeFromCollectionAllowList(address user) public {
+		require(false, stub_error);
+		user;
+		dummy = 0;
+	}
+
+	/// Switch permission for minting.
+	///
+	/// @param mode Enable if "true".
+	/// @dev EVM selector for this function is: 0x00018e84,
+	///  or in textual repr: setCollectionMintMode(bool)
+	function setCollectionMintMode(bool mode) public {
+		require(false, stub_error);
+		mode;
+		dummy = 0;
+	}
+
+	/// Check that account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x9811b0c7,
+	///  or in textual repr: isOwnerOrAdmin(address)
+	function isOwnerOrAdmin(address user) public view returns (bool) {
+		require(false, stub_error);
+		user;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return false;
 	}
-}
 
-// Selector: 5b5e139f
-contract ERC721Metadata is Dummy, ERC165 {
-	// @notice A descriptive name for a collection of NFTs in this contract
-	//
-	// Selector: name() 06fdde03
-	function name() public view returns (string memory) {
+	/// Check that substrate account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x68910e00,
+	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
+	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
 		require(false, stub_error);
+		user;
 		dummy;
+		return false;
+	}
+
+	/// Returns collection type
+	///
+	/// @return `Fungible` or `NFT` or `ReFungible`
+	/// @dev EVM selector for this function is: 0xd34b55b8,
+	///  or in textual repr: uniqueCollectionType()
+	function uniqueCollectionType() public returns (string memory) {
+		require(false, stub_error);
+		dummy = 0;
 		return "";
 	}
 
-	// @notice An abbreviated name for NFTs in this contract
-	//
-	// Selector: symbol() 95d89b41
-	function symbol() public view returns (string memory) {
+	/// Changes collection owner to another account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner account
+	/// @dev EVM selector for this function is: 0x13af4035,
+	///  or in textual repr: setOwner(address)
+	function setOwner(address newOwner) public {
+		require(false, stub_error);
+		newOwner;
+		dummy = 0;
+	}
+
+	/// Changes collection owner to another substrate account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner substrate account
+	/// @dev EVM selector for this function is: 0xb212138f,
+	///  or in textual repr: setOwnerSubstrate(uint256)
+	function setOwnerSubstrate(uint256 newOwner) public {
 		require(false, stub_error);
-		dummy;
-		return "";
+		newOwner;
+		dummy = 0;
 	}
+}
 
-	// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-	//
-	// @dev If the token has a `url` property and it is not empty, it is returned.
-	//  Else If the collection does not have a property with key `schemaName` or its value is not equal to `ERC721Metadata`, it return an error `tokenURI not set`.
-	//  If the collection property `baseURI` is empty or absent, return "" (empty string)
-	//  otherwise, if token property `suffix` present and is non-empty, return concatenation of baseURI and suffix
-	//  otherwise, return concatenation of `baseURI` and stringified token id (decimal stringifying, without paddings).
-	//
-	// @return token's const_metadata
-	//
-	// Selector: tokenURI(uint256) c87b56dd
-	function tokenURI(uint256 tokenId) public view returns (string memory) {
+/// @title ERC721 Token that can be irreversibly burned (destroyed).
+/// @dev the ERC-165 identifier for this interface is 0x42966c68
+contract ERC721Burnable is Dummy, ERC165 {
+	/// @notice Burns a specific ERC721 token.
+	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
+	///  operator of the current owner.
+	/// @param tokenId The NFT to approve
+	/// @dev EVM selector for this function is: 0x42966c68,
+	///  or in textual repr: burn(uint256)
+	function burn(uint256 tokenId) public {
 		require(false, stub_error);
 		tokenId;
-		dummy;
-		return "";
+		dummy = 0;
 	}
 }
 
-// Selector: 68ccfe89
+/// @dev inlined interface
+contract ERC721MintableEvents {
+	event MintingFinished();
+}
+
+/// @title ERC721 minting logic.
+/// @dev the ERC-165 identifier for this interface is 0x68ccfe89
 contract ERC721Mintable is Dummy, ERC165, ERC721MintableEvents {
-	// Selector: mintingFinished() 05d2035b
+	/// @dev EVM selector for this function is: 0x05d2035b,
+	///  or in textual repr: mintingFinished()
 	function mintingFinished() public view returns (bool) {
 		require(false, stub_error);
 		dummy;
 		return false;
 	}
 
-	// @notice Function to mint token.
-	// @dev `tokenId` should be obtained with `nextTokenId` method,
-	//  unlike standard, you can't specify it manually
-	// @param to The new owner
-	// @param tokenId ID of the minted NFT
-	//
-	// Selector: mint(address,uint256) 40c10f19
+	/// @notice Function to mint token.
+	/// @dev `tokenId` should be obtained with `nextTokenId` method,
+	///  unlike standard, you can't specify it manually
+	/// @param to The new owner
+	/// @param tokenId ID of the minted NFT
+	/// @dev EVM selector for this function is: 0x40c10f19,
+	///  or in textual repr: mint(address,uint256)
 	function mint(address to, uint256 tokenId) public returns (bool) {
 		require(false, stub_error);
 		to;
@@ -342,14 +434,14 @@
 		return false;
 	}
 
-	// @notice Function to mint token with the given tokenUri.
-	// @dev `tokenId` should be obtained with `nextTokenId` method,
-	//  unlike standard, you can't specify it manually
-	// @param to The new owner
-	// @param tokenId ID of the minted NFT
-	// @param tokenUri Token URI that would be stored in the NFT properties
-	//
-	// Selector: mintWithTokenURI(address,uint256,string) 50bb4e7f
+	/// @notice Function to mint token with the given tokenUri.
+	/// @dev `tokenId` should be obtained with `nextTokenId` method,
+	///  unlike standard, you can't specify it manually
+	/// @param to The new owner
+	/// @param tokenId ID of the minted NFT
+	/// @param tokenUri Token URI that would be stored in the NFT properties
+	/// @dev EVM selector for this function is: 0x50bb4e7f,
+	///  or in textual repr: mintWithTokenURI(address,uint256,string)
 	function mintWithTokenURI(
 		address to,
 		uint256 tokenId,
@@ -363,9 +455,9 @@
 		return false;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: finishMinting() 7d64bcb4
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x7d64bcb4,
+	///  or in textual repr: finishMinting()
 	function finishMinting() public returns (bool) {
 		require(false, stub_error);
 		dummy = 0;
@@ -373,58 +465,16 @@
 	}
 }
 
-// Selector: 780e9d63
-contract ERC721Enumerable is Dummy, ERC165 {
-	// @notice Enumerate valid NFTs
-	// @param index A counter less than `totalSupply()`
-	// @return The token identifier for the `index`th NFT,
-	//  (sort order not specified)
-	//
-	// Selector: tokenByIndex(uint256) 4f6ccce7
-	function tokenByIndex(uint256 index) public view returns (uint256) {
-		require(false, stub_error);
-		index;
-		dummy;
-		return 0;
-	}
-
-	// @dev Not implemented
-	//
-	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
-	function tokenOfOwnerByIndex(address owner, uint256 index)
-		public
-		view
-		returns (uint256)
-	{
-		require(false, stub_error);
-		owner;
-		index;
-		dummy;
-		return 0;
-	}
-
-	// @notice Count NFTs tracked by this contract
-	// @return A count of valid NFTs tracked by this contract, where each one of
-	//  them has an assigned and queryable owner not equal to the zero address
-	//
-	// Selector: totalSupply() 18160ddd
-	function totalSupply() public view returns (uint256) {
-		require(false, stub_error);
-		dummy;
-		return 0;
-	}
-}
-
-// Selector: d74d154f
+/// @title Unique extensions for ERC721.
+/// @dev the ERC-165 identifier for this interface is 0xd74d154f
 contract ERC721UniqueExtensions is Dummy, ERC165 {
-	// @notice Transfer ownership of an NFT
-	// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
-	//  is the zero address. Throws if `tokenId` is not a valid NFT.
-	// @param to The new owner
-	// @param tokenId The NFT to transfer
-	// @param _value Not used for an NFT
-	//
-	// Selector: transfer(address,uint256) a9059cbb
+	/// @notice Transfer ownership of an NFT
+	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
+	///  is the zero address. Throws if `tokenId` is not a valid NFT.
+	/// @param to The new owner
+	/// @param tokenId The NFT to transfer
+	/// @dev EVM selector for this function is: 0xa9059cbb,
+	///  or in textual repr: transfer(address,uint256)
 	function transfer(address to, uint256 tokenId) public {
 		require(false, stub_error);
 		to;
@@ -432,15 +482,14 @@
 		dummy = 0;
 	}
 
-	// @notice Burns a specific ERC721 token.
-	// @dev Throws unless `msg.sender` is the current owner or an authorized
-	//  operator for this NFT. Throws if `from` is not the current owner. Throws
-	//  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.
-	// @param from The current owner of the NFT
-	// @param tokenId The NFT to transfer
-	// @param _value Not used for an NFT
-	//
-	// Selector: burnFrom(address,uint256) 79cc6790
+	/// @notice Burns a specific ERC721 token.
+	/// @dev Throws unless `msg.sender` is the current owner or an authorized
+	///  operator for this NFT. Throws if `from` is not the current owner. Throws
+	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.
+	/// @param from The current owner of the NFT
+	/// @param tokenId The NFT to transfer
+	/// @dev EVM selector for this function is: 0x79cc6790,
+	///  or in textual repr: burnFrom(address,uint256)
 	function burnFrom(address from, uint256 tokenId) public {
 		require(false, stub_error);
 		from;
@@ -448,22 +497,22 @@
 		dummy = 0;
 	}
 
-	// @notice Returns next free NFT ID.
-	//
-	// Selector: nextTokenId() 75794a3c
+	/// @notice Returns next free NFT ID.
+	/// @dev EVM selector for this function is: 0x75794a3c,
+	///  or in textual repr: nextTokenId()
 	function nextTokenId() public view returns (uint256) {
 		require(false, stub_error);
 		dummy;
 		return 0;
 	}
 
-	// @notice Function to mint multiple tokens.
-	// @dev `tokenIds` should be an array of consecutive numbers and first number
-	//  should be obtained with `nextTokenId` method
-	// @param to The new owner
-	// @param tokenIds IDs of the minted NFTs
-	//
-	// Selector: mintBulk(address,uint256[]) 44a9945e
+	/// @notice Function to mint multiple tokens.
+	/// @dev `tokenIds` should be an array of consecutive numbers and first number
+	///  should be obtained with `nextTokenId` method
+	/// @param to The new owner
+	/// @param tokenIds IDs of the minted NFTs
+	/// @dev EVM selector for this function is: 0x44a9945e,
+	///  or in textual repr: mintBulk(address,uint256[])
 	function mintBulk(address to, uint256[] memory tokenIds)
 		public
 		returns (bool)
@@ -475,14 +524,14 @@
 		return false;
 	}
 
-	// @notice Function to mint multiple tokens with the given tokenUris.
-	// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive
-	//  numbers and first number should be obtained with `nextTokenId` method
-	// @param to The new owner
-	// @param tokens array of pairs of token ID and token URI for minted tokens
-	//
-	// Selector: mintBulkWithTokenURI(address,(uint256,string)[]) 36543006
-	function mintBulkWithTokenURI(address to, Tuple0[] memory tokens)
+	/// @notice Function to mint multiple tokens with the given tokenUris.
+	/// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive
+	///  numbers and first number should be obtained with `nextTokenId` method
+	/// @param to The new owner
+	/// @param tokens array of pairs of token ID and token URI for minted tokens
+	/// @dev EVM selector for this function is: 0x36543006,
+	///  or in textual repr: mintBulkWithTokenURI(address,(uint256,string)[])
+	function mintBulkWithTokenURI(address to, Tuple8[] memory tokens)
 		public
 		returns (bool)
 	{
@@ -494,291 +543,251 @@
 	}
 }
 
-// Selector: ffe4da23
-contract Collection is Dummy, ERC165 {
-	// Set collection property.
-	//
-	// @param key Property key.
-	// @param value Propery value.
-	//
-	// Selector: setCollectionProperty(string,bytes) 2f073f66
-	function setCollectionProperty(string memory key, bytes memory value)
-		public
-	{
-		require(false, stub_error);
-		key;
-		value;
-		dummy = 0;
-	}
+/// @dev anonymous struct
+struct Tuple8 {
+	uint256 field_0;
+	string field_1;
+}
 
-	// Delete collection property.
-	//
-	// @param key Property key.
-	//
-	// Selector: deleteCollectionProperty(string) 7b7debce
-	function deleteCollectionProperty(string memory key) public {
+/// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
+/// @dev See https://eips.ethereum.org/EIPS/eip-721
+/// @dev the ERC-165 identifier for this interface is 0x780e9d63
+contract ERC721Enumerable is Dummy, ERC165 {
+	/// @notice Enumerate valid NFTs
+	/// @param index A counter less than `totalSupply()`
+	/// @return The token identifier for the `index`th NFT,
+	///  (sort order not specified)
+	/// @dev EVM selector for this function is: 0x4f6ccce7,
+	///  or in textual repr: tokenByIndex(uint256)
+	function tokenByIndex(uint256 index) public view returns (uint256) {
 		require(false, stub_error);
-		key;
-		dummy = 0;
+		index;
+		dummy;
+		return 0;
 	}
 
-	// Get collection property.
-	//
-	// @dev Throws error if key not found.
-	//
-	// @param key Property key.
-	// @return bytes The property corresponding to the key.
-	//
-	// Selector: collectionProperty(string) cf24fd6d
-	function collectionProperty(string memory key)
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x2f745c59,
+	///  or in textual repr: tokenOfOwnerByIndex(address,uint256)
+	function tokenOfOwnerByIndex(address owner, uint256 index)
 		public
 		view
-		returns (bytes memory)
+		returns (uint256)
 	{
 		require(false, stub_error);
-		key;
+		owner;
+		index;
 		dummy;
-		return hex"";
+		return 0;
 	}
 
-	// Set the sponsor of the collection.
-	//
-	// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	//
-	// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
-	//
-	// Selector: setCollectionSponsor(address) 7623402e
-	function setCollectionSponsor(address sponsor) public {
+	/// @notice Count NFTs tracked by this contract
+	/// @return A count of valid NFTs tracked by this contract, where each one of
+	///  them has an assigned and queryable owner not equal to the zero address
+	/// @dev EVM selector for this function is: 0x18160ddd,
+	///  or in textual repr: totalSupply()
+	function totalSupply() public view returns (uint256) {
 		require(false, stub_error);
-		sponsor;
-		dummy = 0;
+		dummy;
+		return 0;
 	}
+}
 
-	// Collection sponsorship confirmation.
-	//
-	// @dev After setting the sponsor for the collection, it must be confirmed with this function.
-	//
-	// Selector: confirmCollectionSponsorship() 3c50e97a
-	function confirmCollectionSponsorship() public {
+/// @title ERC-721 Non-Fungible Token Standard, optional metadata extension
+/// @dev See https://eips.ethereum.org/EIPS/eip-721
+/// @dev the ERC-165 identifier for this interface is 0x5b5e139f
+contract ERC721Metadata is Dummy, ERC165 {
+	/// @notice A descriptive name for a collection of NFTs in this contract
+	/// @dev EVM selector for this function is: 0x06fdde03,
+	///  or in textual repr: name()
+	function name() public view returns (string memory) {
 		require(false, stub_error);
-		dummy = 0;
+		dummy;
+		return "";
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"accountTokenOwnershipLimit",
-	// 	"sponsoredDataSize",
-	// 	"sponsoredDataRateLimit",
-	// 	"tokenLimit",
-	// 	"sponsorTransferTimeout",
-	// 	"sponsorApproveTimeout"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,uint32) 6a3841db
-	function setCollectionLimit(string memory limit, uint32 value) public {
+	/// @notice An abbreviated name for NFTs in this contract
+	/// @dev EVM selector for this function is: 0x95d89b41,
+	///  or in textual repr: symbol()
+	function symbol() public view returns (string memory) {
 		require(false, stub_error);
-		limit;
-		value;
-		dummy = 0;
+		dummy;
+		return "";
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"ownerCanTransfer",
-	// 	"ownerCanDestroy",
-	// 	"transfersEnabled"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,bool) 993b7fba
-	function setCollectionLimit(string memory limit, bool value) public {
+	/// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
+	///
+	/// @dev If the token has a `url` property and it is not empty, it is returned.
+	///  Else If the collection does not have a property with key `schemaName` or its value is not equal to `ERC721Metadata`, it return an error `tokenURI not set`.
+	///  If the collection property `baseURI` is empty or absent, return "" (empty string)
+	///  otherwise, if token property `suffix` present and is non-empty, return concatenation of baseURI and suffix
+	///  otherwise, return concatenation of `baseURI` and stringified token id (decimal stringifying, without paddings).
+	///
+	/// @return token's const_metadata
+	/// @dev EVM selector for this function is: 0xc87b56dd,
+	///  or in textual repr: tokenURI(uint256)
+	function tokenURI(uint256 tokenId) public view returns (string memory) {
 		require(false, stub_error);
-		limit;
-		value;
-		dummy = 0;
-	}
-
-	// Get contract address.
-	//
-	// Selector: contractAddress() f6b4dfb4
-	function contractAddress() public view returns (address) {
-		require(false, stub_error);
+		tokenId;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return "";
 	}
+}
 
-	// Add collection admin by substrate address.
-	// @param new_admin Substrate administrator address.
-	//
-	// Selector: addCollectionAdminSubstrate(uint256) 5730062b
-	function addCollectionAdminSubstrate(uint256 newAdmin) public {
-		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
-	}
+/// @dev inlined interface
+contract ERC721Events {
+	event Transfer(
+		address indexed from,
+		address indexed to,
+		uint256 indexed tokenId
+	);
+	event Approval(
+		address indexed owner,
+		address indexed approved,
+		uint256 indexed tokenId
+	);
+	event ApprovalForAll(
+		address indexed owner,
+		address indexed operator,
+		bool approved
+	);
+}
 
-	// Remove collection admin by substrate address.
-	// @param admin Substrate administrator address.
-	//
-	// Selector: removeCollectionAdminSubstrate(uint256) 4048fcf9
-	function removeCollectionAdminSubstrate(uint256 admin) public {
+/// @title ERC-721 Non-Fungible Token Standard
+/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
+/// @dev the ERC-165 identifier for this interface is 0x80ac58cd
+contract ERC721 is Dummy, ERC165, ERC721Events {
+	/// @notice Count all NFTs assigned to an owner
+	/// @dev NFTs assigned to the zero address are considered invalid, and this
+	///  function throws for queries about the zero address.
+	/// @param owner An address for whom to query the balance
+	/// @return The number of NFTs owned by `owner`, possibly zero
+	/// @dev EVM selector for this function is: 0x70a08231,
+	///  or in textual repr: balanceOf(address)
+	function balanceOf(address owner) public view returns (uint256) {
 		require(false, stub_error);
-		admin;
-		dummy = 0;
+		owner;
+		dummy;
+		return 0;
 	}
 
-	// Add collection admin.
-	// @param new_admin Address of the added administrator.
-	//
-	// Selector: addCollectionAdmin(address) 92e462c7
-	function addCollectionAdmin(address newAdmin) public {
+	/// @notice Find the owner of an NFT
+	/// @dev NFTs assigned to zero address are considered invalid, and queries
+	///  about them do throw.
+	/// @param tokenId The identifier for an NFT
+	/// @return The address of the owner of the NFT
+	/// @dev EVM selector for this function is: 0x6352211e,
+	///  or in textual repr: ownerOf(uint256)
+	function ownerOf(uint256 tokenId) public view returns (address) {
 		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
+		tokenId;
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Remove collection admin.
-	//
-	// @param new_admin Address of the removed administrator.
-	//
-	// Selector: removeCollectionAdmin(address) fafd7b42
-	function removeCollectionAdmin(address admin) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0xb88d4fde,
+	///  or in textual repr: safeTransferFrom(address,address,uint256,bytes)
+	function safeTransferFrom(
+		address from,
+		address to,
+		uint256 tokenId,
+		bytes memory data
+	) public {
 		require(false, stub_error);
-		admin;
+		from;
+		to;
+		tokenId;
+		data;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
-	//
-	// Selector: setCollectionNesting(bool) 112d4586
-	function setCollectionNesting(bool enable) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x42842e0e,
+	///  or in textual repr: safeTransferFrom(address,address,uint256)
+	function safeTransferFrom(
+		address from,
+		address to,
+		uint256 tokenId
+	) public {
 		require(false, stub_error);
-		enable;
+		from;
+		to;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
-	// @param collections Addresses of collections that will be available for nesting.
-	//
-	// Selector: setCollectionNesting(bool,address[]) 64872396
-	function setCollectionNesting(bool enable, address[] memory collections)
-		public
-	{
+	/// @notice Transfer ownership of an NFT -- THE CALLER IS RESPONSIBLE
+	///  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE
+	///  THEY MAY BE PERMANENTLY LOST
+	/// @dev Throws unless `msg.sender` is the current owner or an authorized
+	///  operator for this NFT. Throws if `from` is not the current owner. Throws
+	///  if `to` is the zero address. Throws if `tokenId` is not a valid NFT.
+	/// @param from The current owner of the NFT
+	/// @param to The new owner
+	/// @param tokenId The NFT to transfer
+	/// @dev EVM selector for this function is: 0x23b872dd,
+	///  or in textual repr: transferFrom(address,address,uint256)
+	function transferFrom(
+		address from,
+		address to,
+		uint256 tokenId
+	) public {
 		require(false, stub_error);
-		enable;
-		collections;
+		from;
+		to;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Set the collection access method.
-	// @param mode Access mode
-	// 	0 for Normal
-	// 	1 for AllowList
-	//
-	// Selector: setCollectionAccess(uint8) 41835d4c
-	function setCollectionAccess(uint8 mode) public {
+	/// @notice Set or reaffirm the approved address for an NFT
+	/// @dev The zero address indicates there is no approved address.
+	/// @dev Throws unless `msg.sender` is the current NFT owner, or an authorized
+	///  operator of the current owner.
+	/// @param approved The new approved NFT controller
+	/// @param tokenId The NFT to approve
+	/// @dev EVM selector for this function is: 0x095ea7b3,
+	///  or in textual repr: approve(address,uint256)
+	function approve(address approved, uint256 tokenId) public {
 		require(false, stub_error);
-		mode;
+		approved;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Add the user to the allowed list.
-	//
-	// @param user Address of a trusted user.
-	//
-	// Selector: addToCollectionAllowList(address) 67844fe6
-	function addToCollectionAllowList(address user) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0xa22cb465,
+	///  or in textual repr: setApprovalForAll(address,bool)
+	function setApprovalForAll(address operator, bool approved) public {
 		require(false, stub_error);
-		user;
-		dummy = 0;
-	}
-
-	// Remove the user from the allowed list.
-	//
-	// @param user Address of a removed user.
-	//
-	// Selector: removeFromCollectionAllowList(address) 85c51acb
-	function removeFromCollectionAllowList(address user) public {
-		require(false, stub_error);
-		user;
+		operator;
+		approved;
 		dummy = 0;
 	}
 
-	// Switch permission for minting.
-	//
-	// @param mode Enable if "true".
-	//
-	// Selector: setCollectionMintMode(bool) 00018e84
-	function setCollectionMintMode(bool mode) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x081812fc,
+	///  or in textual repr: getApproved(uint256)
+	function getApproved(uint256 tokenId) public view returns (address) {
 		require(false, stub_error);
-		mode;
-		dummy = 0;
-	}
-
-	// Check that account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdmin(address) 9811b0c7
-	function isOwnerOrAdmin(address user) public view returns (bool) {
-		require(false, stub_error);
-		user;
+		tokenId;
 		dummy;
-		return false;
+		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Check that substrate account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdminSubstrate(uint256) 68910e00
-	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0xe985e9c5,
+	///  or in textual repr: isApprovedForAll(address,address)
+	function isApprovedForAll(address owner, address operator)
+		public
+		view
+		returns (address)
+	{
 		require(false, stub_error);
-		user;
+		owner;
+		operator;
 		dummy;
-		return false;
-	}
-
-	// Returns collection type
-	//
-	// @return `Fungible` or `NFT` or `ReFungible`
-	//
-	// Selector: uniqueCollectionType() d34b55b8
-	function uniqueCollectionType() public returns (string memory) {
-		require(false, stub_error);
-		dummy = 0;
-		return "";
-	}
-
-	// Changes collection owner to another account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner account
-	//
-	// Selector: setOwner(address) 13af4035
-	function setOwner(address newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
-	}
-
-	// Changes collection owner to another substrate account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner substrate account
-	//
-	// Selector: setOwnerSubstrate(uint256) b212138f
-	function setOwnerSubstrate(uint256 newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
+		return 0x0000000000000000000000000000000000000000;
 	}
 }
 

--- a/pallets/refungible/src/erc.rs
+++ b/pallets/refungible/src/erc.rs
@@ -53,14 +53,14 @@
 pub const ADDRESS_FOR_PARTIALLY_OWNED_TOKENS: H160 = H160::repeat_byte(0xff);
 
 /// @title A contract that allows to set and delete token properties and change token property permissions.
-#[solidity_interface(name = "TokenProperties")]
+#[solidity_interface(name = TokenProperties)]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice Set permissions for token property.
 	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.
 	/// @param key Property key.
-	/// @param is_mutable Permission to mutate property.
-	/// @param collection_admin Permission to mutate property by collection admin if property is mutable.
-	/// @param token_owner Permission to mutate property by token owner if property is mutable.
+	/// @param isMutable Permission to mutate property.
+	/// @param collectionAdmin Permission to mutate property by collection admin if property is mutable.
+	/// @param tokenOwner Permission to mutate property by token owner if property is mutable.
 	fn set_token_property_permission(
 		&mut self,
 		caller: caller,
@@ -197,7 +197,7 @@
 	MintingFinished {},
 }
 
-#[solidity_interface(name = "ERC721Metadata")]
+#[solidity_interface(name = ERC721Metadata)]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice A descriptive name for a collection of RFTs in this contract
 	fn name(&self) -> Result<string> {
@@ -258,7 +258,7 @@
 
 /// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 /// @dev See https://eips.ethereum.org/EIPS/eip-721
-#[solidity_interface(name = "ERC721Enumerable")]
+#[solidity_interface(name = ERC721Enumerable)]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice Enumerate valid RFTs
 	/// @param index A counter less than `totalSupply()`
@@ -285,7 +285,7 @@
 
 /// @title ERC-721 Non-Fungible Token Standard
 /// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
-#[solidity_interface(name = "ERC721", events(ERC721Events))]
+#[solidity_interface(name = ERC721, events(ERC721Events))]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice Count all RFTs assigned to an owner
 	/// @dev RFTs assigned to the zero address are considered invalid, and this
@@ -322,7 +322,6 @@
 		_to: address,
 		_token_id: uint256,
 		_data: bytes,
-		_value: value,
 	) -> Result<void> {
 		// TODO: Not implemetable
 		Err("not implemented".into())
@@ -334,7 +333,6 @@
 		_from: address,
 		_to: address,
 		_token_id: uint256,
-		_value: value,
 	) -> Result<void> {
 		// TODO: Not implemetable
 		Err("not implemented".into())
@@ -350,7 +348,6 @@
 	/// @param from The current owner of the NFT
 	/// @param to The new owner
 	/// @param tokenId The NFT to transfer
-	/// @param _value Not used for an NFT
 	#[weight(<SelfWeightOf<T>>::transfer_from_creating_removing())]
 	fn transfer_from(
 		&mut self,
@@ -358,7 +355,6 @@
 		from: address,
 		to: address,
 		token_id: uint256,
-		_value: value,
 	) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let from = T::CrossAccountId::from_eth(from);
@@ -378,13 +374,7 @@
 	}
 
 	/// @dev Not implemented
-	fn approve(
-		&mut self,
-		_caller: caller,
-		_approved: address,
-		_token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn approve(&mut self, _caller: caller, _approved: address, _token_id: uint256) -> Result<void> {
 		Err("not implemented".into())
 	}
 
@@ -438,7 +428,7 @@
 }
 
 /// @title ERC721 Token that can be irreversibly burned (destroyed).
-#[solidity_interface(name = "ERC721Burnable")]
+#[solidity_interface(name = ERC721Burnable)]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice Burns a specific ERC721 token.
 	/// @dev Throws unless `msg.sender` is the current RFT owner, or an authorized
@@ -458,7 +448,7 @@
 }
 
 /// @title ERC721 minting logic.
-#[solidity_interface(name = "ERC721Mintable", events(ERC721MintableEvents))]
+#[solidity_interface(name = ERC721Mintable, events(ERC721MintableEvents))]
 impl<T: Config> RefungibleHandle<T> {
 	fn minting_finished(&self) -> Result<bool> {
 		Ok(false)
@@ -616,7 +606,7 @@
 }
 
 /// @title Unique extensions for ERC721.
-#[solidity_interface(name = "ERC721UniqueExtensions")]
+#[solidity_interface(name = ERC721UniqueExtensions)]
 impl<T: Config> RefungibleHandle<T> {
 	/// @notice Transfer ownership of an RFT
 	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
@@ -624,15 +614,8 @@
 	///  Throws if RFT pieces have multiple owners.
 	/// @param to The new owner
 	/// @param tokenId The RFT to transfer
-	/// @param _value Not used for an RFT
 	#[weight(<SelfWeightOf<T>>::transfer_creating_removing())]
-	fn transfer(
-		&mut self,
-		caller: caller,
-		to: address,
-		token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn transfer(&mut self, caller: caller, to: address, token_id: uint256) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let to = T::CrossAccountId::from_eth(to);
 		let token = token_id.try_into()?;
@@ -655,15 +638,8 @@
 	///  Throws if RFT pieces have multiple owners.
 	/// @param from The current owner of the RFT
 	/// @param tokenId The RFT to transfer
-	/// @param _value Not used for an RFT
 	#[weight(<SelfWeightOf<T>>::burn_from())]
-	fn burn_from(
-		&mut self,
-		caller: caller,
-		from: address,
-		token_id: uint256,
-		_value: value,
-	) -> Result<void> {
+	fn burn_from(&mut self, caller: caller, from: address, token_id: uint256) -> Result<void> {
 		let caller = T::CrossAccountId::from_eth(caller);
 		let from = T::CrossAccountId::from_eth(from);
 		let token = token_id.try_into()?;
@@ -801,7 +777,7 @@
 }
 
 #[solidity_interface(
-	name = "UniqueRefungible",
+	name = UniqueRefungible,
 	is(
 		ERC721,
 		ERC721Metadata,
@@ -809,7 +785,7 @@
 		ERC721UniqueExtensions,
 		ERC721Mintable,
 		ERC721Burnable,
-		via("CollectionHandle<T>", common_mut, Collection),
+		Collection(common_mut, CollectionHandle<T>),
 		TokenProperties,
 	)
 )]

--- a/pallets/refungible/src/erc_token.rs
+++ b/pallets/refungible/src/erc_token.rs
@@ -49,7 +49,7 @@
 
 pub struct RefungibleTokenHandle<T: Config>(pub RefungibleHandle<T>, pub TokenId);
 
-#[solidity_interface(name = "ERC1633")]
+#[solidity_interface(name = ERC1633)]
 impl<T: Config> RefungibleTokenHandle<T> {
 	fn parent_token(&self) -> Result<address> {
 		self.consume_store_reads(2)?;
@@ -87,7 +87,7 @@
 	}
 }
 
-#[solidity_interface(name = "ERC1633UniqueExtensions")]
+#[solidity_interface(name = ERC1633UniqueExtensions)]
 impl<T: Config> RefungibleTokenHandle<T> {
 	#[solidity(rename_selector = "setParentNFT")]
 	#[weight(<CommonWeights<T>>::token_owner() + <SelfWeightOf<T>>::set_parent_nft_unchecked())]
@@ -137,7 +137,7 @@
 ///
 /// @dev Implementation of the basic standard token.
 /// https://github.com/ethereum/EIPs/blob/master/EIPS/eip-20.md
-#[solidity_interface(name = "ERC20", events(ERC20Events))]
+#[solidity_interface(name = ERC20, events(ERC20Events))]
 impl<T: Config> RefungibleTokenHandle<T> {
 	/// @return the name of the token.
 	fn name(&self) -> Result<string> {
@@ -246,7 +246,7 @@
 	}
 }
 
-#[solidity_interface(name = "ERC20UniqueExtensions")]
+#[solidity_interface(name = ERC20UniqueExtensions)]
 impl<T: Config> RefungibleTokenHandle<T> {
 	/// @dev Function that burns an amount of the token of a given account,
 	/// deducting from the sender's allowance for said account.
@@ -306,7 +306,7 @@
 }
 
 #[solidity_interface(
-	name = "UniqueRefungibleToken",
+	name = UniqueRefungibleToken,
 	is(ERC20, ERC20UniqueExtensions, ERC1633, ERC1633UniqueExtensions)
 )]
 impl<T: Config> RefungibleTokenHandle<T> where T::AccountId: From<[u8; 32]> {}

binary blob — no preview

--- a/pallets/refungible/src/stubs/UniqueRefungible.sol
+++ b/pallets/refungible/src/stubs/UniqueRefungible.sol
@@ -3,13 +3,7 @@
 
 pragma solidity >=0.8.0 <0.9.0;
 
-// Anonymous struct
-struct Tuple0 {
-	uint256 field_0;
-	string field_1;
-}
-
-// Common stubs holder
+/// @dev common stubs holder
 contract Dummy {
 	uint8 dummy;
 	string stub_error = "this contract is implemented in native";
@@ -27,40 +21,17 @@
 	}
 }
 
-// Inline
-contract ERC721Events {
-	event Transfer(
-		address indexed from,
-		address indexed to,
-		uint256 indexed tokenId
-	);
-	event Approval(
-		address indexed owner,
-		address indexed approved,
-		uint256 indexed tokenId
-	);
-	event ApprovalForAll(
-		address indexed owner,
-		address indexed operator,
-		bool approved
-	);
-}
-
-// Inline
-contract ERC721MintableEvents {
-	event MintingFinished();
-}
-
-// Selector: 41369377
+/// @title A contract that allows to set and delete token properties and change token property permissions.
+/// @dev the ERC-165 identifier for this interface is 0x41369377
 contract TokenProperties is Dummy, ERC165 {
-	// @notice Set permissions for token property.
-	// @dev Throws error if `msg.sender` is not admin or owner of the collection.
-	// @param key Property key.
-	// @param is_mutable Permission to mutate property.
-	// @param collection_admin Permission to mutate property by collection admin if property is mutable.
-	// @param token_owner Permission to mutate property by token owner if property is mutable.
-	//
-	// Selector: setTokenPropertyPermission(string,bool,bool,bool) 222d97fa
+	/// @notice Set permissions for token property.
+	/// @dev Throws error if `msg.sender` is not admin or owner of the collection.
+	/// @param key Property key.
+	/// @param isMutable Permission to mutate property.
+	/// @param collectionAdmin Permission to mutate property by collection admin if property is mutable.
+	/// @param tokenOwner Permission to mutate property by token owner if property is mutable.
+	/// @dev EVM selector for this function is: 0x222d97fa,
+	///  or in textual repr: setTokenPropertyPermission(string,bool,bool,bool)
 	function setTokenPropertyPermission(
 		string memory key,
 		bool isMutable,
@@ -75,13 +46,13 @@
 		dummy = 0;
 	}
 
-	// @notice Set token property value.
-	// @dev Throws error if `msg.sender` has no permission to edit the property.
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	// @param value Property value.
-	//
-	// Selector: setProperty(uint256,string,bytes) 1752d67b
+	/// @notice Set token property value.
+	/// @dev Throws error if `msg.sender` has no permission to edit the property.
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @param value Property value.
+	/// @dev EVM selector for this function is: 0x1752d67b,
+	///  or in textual repr: setProperty(uint256,string,bytes)
 	function setProperty(
 		uint256 tokenId,
 		string memory key,
@@ -94,12 +65,12 @@
 		dummy = 0;
 	}
 
-	// @notice Delete token property value.
-	// @dev Throws error if `msg.sender` has no permission to edit the property.
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	//
-	// Selector: deleteProperty(uint256,string) 066111d1
+	/// @notice Delete token property value.
+	/// @dev Throws error if `msg.sender` has no permission to edit the property.
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @dev EVM selector for this function is: 0x066111d1,
+	///  or in textual repr: deleteProperty(uint256,string)
 	function deleteProperty(uint256 tokenId, string memory key) public {
 		require(false, stub_error);
 		tokenId;
@@ -107,13 +78,13 @@
 		dummy = 0;
 	}
 
-	// @notice Get token property value.
-	// @dev Throws error if key not found
-	// @param tokenId ID of the token.
-	// @param key Property key.
-	// @return Property value bytes
-	//
-	// Selector: property(uint256,string) 7228c327
+	/// @notice Get token property value.
+	/// @dev Throws error if key not found
+	/// @param tokenId ID of the token.
+	/// @param key Property key.
+	/// @return Property value bytes
+	/// @dev EVM selector for this function is: 0x7228c327,
+	///  or in textual repr: property(uint256,string)
 	function property(uint256 tokenId, string memory key)
 		public
 		view
@@ -127,211 +98,334 @@
 	}
 }
 
-// Selector: 42966c68
-contract ERC721Burnable is Dummy, ERC165 {
-	// @notice Burns a specific ERC721 token.
-	// @dev Throws unless `msg.sender` is the current RFT owner, or an authorized
-	//  operator of the current owner.
-	// @param tokenId The RFT to approve
-	//
-	// Selector: burn(uint256) 42966c68
-	function burn(uint256 tokenId) public {
+/// @title A contract that allows you to work with collections.
+/// @dev the ERC-165 identifier for this interface is 0xffe4da23
+contract Collection is Dummy, ERC165 {
+	/// Set collection property.
+	///
+	/// @param key Property key.
+	/// @param value Propery value.
+	/// @dev EVM selector for this function is: 0x2f073f66,
+	///  or in textual repr: setCollectionProperty(string,bytes)
+	function setCollectionProperty(string memory key, bytes memory value)
+		public
+	{
 		require(false, stub_error);
-		tokenId;
+		key;
+		value;
 		dummy = 0;
 	}
-}
 
-// Selector: 58800161
-contract ERC721 is Dummy, ERC165, ERC721Events {
-	// @notice Count all RFTs assigned to an owner
-	// @dev RFTs assigned to the zero address are considered invalid, and this
-	//  function throws for queries about the zero address.
-	// @param owner An address for whom to query the balance
-	// @return The number of RFTs owned by `owner`, possibly zero
-	//
-	// Selector: balanceOf(address) 70a08231
-	function balanceOf(address owner) public view returns (uint256) {
+	/// Delete collection property.
+	///
+	/// @param key Property key.
+	/// @dev EVM selector for this function is: 0x7b7debce,
+	///  or in textual repr: deleteCollectionProperty(string)
+	function deleteCollectionProperty(string memory key) public {
 		require(false, stub_error);
-		owner;
-		dummy;
-		return 0;
+		key;
+		dummy = 0;
 	}
 
-	// @notice Find the owner of an RFT
-	// @dev RFTs assigned to zero address are considered invalid, and queries
-	//  about them do throw.
-	//  Returns special 0xffffffffffffffffffffffffffffffffffffffff address for
-	//  the tokens that are partially owned.
-	// @param tokenId The identifier for an RFT
-	// @return The address of the owner of the RFT
-	//
-	// Selector: ownerOf(uint256) 6352211e
-	function ownerOf(uint256 tokenId) public view returns (address) {
+	/// Get collection property.
+	///
+	/// @dev Throws error if key not found.
+	///
+	/// @param key Property key.
+	/// @return bytes The property corresponding to the key.
+	/// @dev EVM selector for this function is: 0xcf24fd6d,
+	///  or in textual repr: collectionProperty(string)
+	function collectionProperty(string memory key)
+		public
+		view
+		returns (bytes memory)
+	{
 		require(false, stub_error);
-		tokenId;
+		key;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return hex"";
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: safeTransferFromWithData(address,address,uint256,bytes) 60a11672
-	function safeTransferFromWithData(
-		address from,
-		address to,
-		uint256 tokenId,
-		bytes memory data
-	) public {
+	/// Set the sponsor of the collection.
+	///
+	/// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
+	///
+	/// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
+	/// @dev EVM selector for this function is: 0x7623402e,
+	///  or in textual repr: setCollectionSponsor(address)
+	function setCollectionSponsor(address sponsor) public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
-		data;
+		sponsor;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: safeTransferFrom(address,address,uint256) 42842e0e
-	function safeTransferFrom(
-		address from,
-		address to,
-		uint256 tokenId
-	) public {
+	/// Collection sponsorship confirmation.
+	///
+	/// @dev After setting the sponsor for the collection, it must be confirmed with this function.
+	/// @dev EVM selector for this function is: 0x3c50e97a,
+	///  or in textual repr: confirmCollectionSponsorship()
+	function confirmCollectionSponsorship() public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
 		dummy = 0;
 	}
 
-	// @notice Transfer ownership of an RFT -- THE CALLER IS RESPONSIBLE
-	//  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE
-	//  THEY MAY BE PERMANENTLY LOST
-	// @dev Throws unless `msg.sender` is the current owner or an authorized
-	//  operator for this RFT. Throws if `from` is not the current owner. Throws
-	//  if `to` is the zero address. Throws if `tokenId` is not a valid RFT.
-	//  Throws if RFT pieces have multiple owners.
-	// @param from The current owner of the NFT
-	// @param to The new owner
-	// @param tokenId The NFT to transfer
-	// @param _value Not used for an NFT
-	//
-	// Selector: transferFrom(address,address,uint256) 23b872dd
-	function transferFrom(
-		address from,
-		address to,
-		uint256 tokenId
-	) public {
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"accountTokenOwnershipLimit",
+	/// 	"sponsoredDataSize",
+	/// 	"sponsoredDataRateLimit",
+	/// 	"tokenLimit",
+	/// 	"sponsorTransferTimeout",
+	/// 	"sponsorApproveTimeout"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x6a3841db,
+	///  or in textual repr: setCollectionLimit(string,uint32)
+	function setCollectionLimit(string memory limit, uint32 value) public {
 		require(false, stub_error);
-		from;
-		to;
-		tokenId;
+		limit;
+		value;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: approve(address,uint256) 095ea7b3
-	function approve(address approved, uint256 tokenId) public {
+	/// Set limits for the collection.
+	/// @dev Throws error if limit not found.
+	/// @param limit Name of the limit. Valid names:
+	/// 	"ownerCanTransfer",
+	/// 	"ownerCanDestroy",
+	/// 	"transfersEnabled"
+	/// @param value Value of the limit.
+	/// @dev EVM selector for this function is: 0x993b7fba,
+	///  or in textual repr: setCollectionLimit(string,bool)
+	function setCollectionLimit(string memory limit, bool value) public {
 		require(false, stub_error);
-		approved;
-		tokenId;
+		limit;
+		value;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: setApprovalForAll(address,bool) a22cb465
-	function setApprovalForAll(address operator, bool approved) public {
+	/// Get contract address.
+	/// @dev EVM selector for this function is: 0xf6b4dfb4,
+	///  or in textual repr: contractAddress()
+	function contractAddress() public view returns (address) {
 		require(false, stub_error);
-		operator;
-		approved;
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
+	}
+
+	/// Add collection admin by substrate address.
+	/// @param newAdmin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x5730062b,
+	///  or in textual repr: addCollectionAdminSubstrate(uint256)
+	function addCollectionAdminSubstrate(uint256 newAdmin) public {
+		require(false, stub_error);
+		newAdmin;
 		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: getApproved(uint256) 081812fc
-	function getApproved(uint256 tokenId) public view returns (address) {
+	/// Remove collection admin by substrate address.
+	/// @param admin Substrate administrator address.
+	/// @dev EVM selector for this function is: 0x4048fcf9,
+	///  or in textual repr: removeCollectionAdminSubstrate(uint256)
+	function removeCollectionAdminSubstrate(uint256 admin) public {
 		require(false, stub_error);
-		tokenId;
-		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		admin;
+		dummy = 0;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: isApprovedForAll(address,address) e985e9c5
-	function isApprovedForAll(address owner, address operator)
+	/// Add collection admin.
+	/// @param newAdmin Address of the added administrator.
+	/// @dev EVM selector for this function is: 0x92e462c7,
+	///  or in textual repr: addCollectionAdmin(address)
+	function addCollectionAdmin(address newAdmin) public {
+		require(false, stub_error);
+		newAdmin;
+		dummy = 0;
+	}
+
+	/// Remove collection admin.
+	///
+	/// @param admin Address of the removed administrator.
+	/// @dev EVM selector for this function is: 0xfafd7b42,
+	///  or in textual repr: removeCollectionAdmin(address)
+	function removeCollectionAdmin(address admin) public {
+		require(false, stub_error);
+		admin;
+		dummy = 0;
+	}
+
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
+	/// @dev EVM selector for this function is: 0x112d4586,
+	///  or in textual repr: setCollectionNesting(bool)
+	function setCollectionNesting(bool enable) public {
+		require(false, stub_error);
+		enable;
+		dummy = 0;
+	}
+
+	/// Toggle accessibility of collection nesting.
+	///
+	/// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
+	/// @param collections Addresses of collections that will be available for nesting.
+	/// @dev EVM selector for this function is: 0x64872396,
+	///  or in textual repr: setCollectionNesting(bool,address[])
+	function setCollectionNesting(bool enable, address[] memory collections)
 		public
-		view
-		returns (address)
 	{
 		require(false, stub_error);
-		owner;
-		operator;
+		enable;
+		collections;
+		dummy = 0;
+	}
+
+	/// Set the collection access method.
+	/// @param mode Access mode
+	/// 	0 for Normal
+	/// 	1 for AllowList
+	/// @dev EVM selector for this function is: 0x41835d4c,
+	///  or in textual repr: setCollectionAccess(uint8)
+	function setCollectionAccess(uint8 mode) public {
+		require(false, stub_error);
+		mode;
+		dummy = 0;
+	}
+
+	/// Add the user to the allowed list.
+	///
+	/// @param user Address of a trusted user.
+	/// @dev EVM selector for this function is: 0x67844fe6,
+	///  or in textual repr: addToCollectionAllowList(address)
+	function addToCollectionAllowList(address user) public {
+		require(false, stub_error);
+		user;
+		dummy = 0;
+	}
+
+	/// Remove the user from the allowed list.
+	///
+	/// @param user Address of a removed user.
+	/// @dev EVM selector for this function is: 0x85c51acb,
+	///  or in textual repr: removeFromCollectionAllowList(address)
+	function removeFromCollectionAllowList(address user) public {
+		require(false, stub_error);
+		user;
+		dummy = 0;
+	}
+
+	/// Switch permission for minting.
+	///
+	/// @param mode Enable if "true".
+	/// @dev EVM selector for this function is: 0x00018e84,
+	///  or in textual repr: setCollectionMintMode(bool)
+	function setCollectionMintMode(bool mode) public {
+		require(false, stub_error);
+		mode;
+		dummy = 0;
+	}
+
+	/// Check that account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x9811b0c7,
+	///  or in textual repr: isOwnerOrAdmin(address)
+	function isOwnerOrAdmin(address user) public view returns (bool) {
+		require(false, stub_error);
+		user;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return false;
 	}
-}
 
-// Selector: 5b5e139f
-contract ERC721Metadata is Dummy, ERC165 {
-	// @notice A descriptive name for a collection of RFTs in this contract
-	//
-	// Selector: name() 06fdde03
-	function name() public view returns (string memory) {
+	/// Check that substrate account is the owner or admin of the collection
+	///
+	/// @param user account to verify
+	/// @return "true" if account is the owner or admin
+	/// @dev EVM selector for this function is: 0x68910e00,
+	///  or in textual repr: isOwnerOrAdminSubstrate(uint256)
+	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
 		require(false, stub_error);
+		user;
 		dummy;
-		return "";
+		return false;
 	}
 
-	// @notice An abbreviated name for RFTs in this contract
-	//
-	// Selector: symbol() 95d89b41
-	function symbol() public view returns (string memory) {
+	/// Returns collection type
+	///
+	/// @return `Fungible` or `NFT` or `ReFungible`
+	/// @dev EVM selector for this function is: 0xd34b55b8,
+	///  or in textual repr: uniqueCollectionType()
+	function uniqueCollectionType() public returns (string memory) {
 		require(false, stub_error);
-		dummy;
+		dummy = 0;
 		return "";
 	}
 
-	// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
-	//
-	// @dev If the token has a `url` property and it is not empty, it is returned.
-	//  Else If the collection does not have a property with key `schemaName` or its value is not equal to `ERC721Metadata`, it return an error `tokenURI not set`.
-	//  If the collection property `baseURI` is empty or absent, return "" (empty string)
-	//  otherwise, if token property `suffix` present and is non-empty, return concatenation of baseURI and suffix
-	//  otherwise, return concatenation of `baseURI` and stringified token id (decimal stringifying, without paddings).
-	//
-	// @return token's const_metadata
-	//
-	// Selector: tokenURI(uint256) c87b56dd
-	function tokenURI(uint256 tokenId) public view returns (string memory) {
+	/// Changes collection owner to another account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner account
+	/// @dev EVM selector for this function is: 0x13af4035,
+	///  or in textual repr: setOwner(address)
+	function setOwner(address newOwner) public {
 		require(false, stub_error);
+		newOwner;
+		dummy = 0;
+	}
+
+	/// Changes collection owner to another substrate account
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner substrate account
+	/// @dev EVM selector for this function is: 0xb212138f,
+	///  or in textual repr: setOwnerSubstrate(uint256)
+	function setOwnerSubstrate(uint256 newOwner) public {
+		require(false, stub_error);
+		newOwner;
+		dummy = 0;
+	}
+}
+
+/// @title ERC721 Token that can be irreversibly burned (destroyed).
+/// @dev the ERC-165 identifier for this interface is 0x42966c68
+contract ERC721Burnable is Dummy, ERC165 {
+	/// @notice Burns a specific ERC721 token.
+	/// @dev Throws unless `msg.sender` is the current RFT owner, or an authorized
+	///  operator of the current owner.
+	/// @param tokenId The RFT to approve
+	/// @dev EVM selector for this function is: 0x42966c68,
+	///  or in textual repr: burn(uint256)
+	function burn(uint256 tokenId) public {
+		require(false, stub_error);
 		tokenId;
-		dummy;
-		return "";
+		dummy = 0;
 	}
 }
 
-// Selector: 68ccfe89
+/// @dev inlined interface
+contract ERC721MintableEvents {
+	event MintingFinished();
+}
+
+/// @title ERC721 minting logic.
+/// @dev the ERC-165 identifier for this interface is 0x68ccfe89
 contract ERC721Mintable is Dummy, ERC165, ERC721MintableEvents {
-	// Selector: mintingFinished() 05d2035b
+	/// @dev EVM selector for this function is: 0x05d2035b,
+	///  or in textual repr: mintingFinished()
 	function mintingFinished() public view returns (bool) {
 		require(false, stub_error);
 		dummy;
 		return false;
 	}
 
-	// @notice Function to mint token.
-	// @dev `tokenId` should be obtained with `nextTokenId` method,
-	//  unlike standard, you can't specify it manually
-	// @param to The new owner
-	// @param tokenId ID of the minted RFT
-	//
-	// Selector: mint(address,uint256) 40c10f19
+	/// @notice Function to mint token.
+	/// @dev `tokenId` should be obtained with `nextTokenId` method,
+	///  unlike standard, you can't specify it manually
+	/// @param to The new owner
+	/// @param tokenId ID of the minted RFT
+	/// @dev EVM selector for this function is: 0x40c10f19,
+	///  or in textual repr: mint(address,uint256)
 	function mint(address to, uint256 tokenId) public returns (bool) {
 		require(false, stub_error);
 		to;
@@ -340,14 +434,14 @@
 		return false;
 	}
 
-	// @notice Function to mint token with the given tokenUri.
-	// @dev `tokenId` should be obtained with `nextTokenId` method,
-	//  unlike standard, you can't specify it manually
-	// @param to The new owner
-	// @param tokenId ID of the minted RFT
-	// @param tokenUri Token URI that would be stored in the RFT properties
-	//
-	// Selector: mintWithTokenURI(address,uint256,string) 50bb4e7f
+	/// @notice Function to mint token with the given tokenUri.
+	/// @dev `tokenId` should be obtained with `nextTokenId` method,
+	///  unlike standard, you can't specify it manually
+	/// @param to The new owner
+	/// @param tokenId ID of the minted RFT
+	/// @param tokenUri Token URI that would be stored in the RFT properties
+	/// @dev EVM selector for this function is: 0x50bb4e7f,
+	///  or in textual repr: mintWithTokenURI(address,uint256,string)
 	function mintWithTokenURI(
 		address to,
 		uint256 tokenId,
@@ -361,9 +455,9 @@
 		return false;
 	}
 
-	// @dev Not implemented
-	//
-	// Selector: finishMinting() 7d64bcb4
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x7d64bcb4,
+	///  or in textual repr: finishMinting()
 	function finishMinting() public returns (bool) {
 		require(false, stub_error);
 		dummy = 0;
@@ -371,59 +465,17 @@
 	}
 }
 
-// Selector: 780e9d63
-contract ERC721Enumerable is Dummy, ERC165 {
-	// @notice Enumerate valid RFTs
-	// @param index A counter less than `totalSupply()`
-	// @return The token identifier for the `index`th NFT,
-	//  (sort order not specified)
-	//
-	// Selector: tokenByIndex(uint256) 4f6ccce7
-	function tokenByIndex(uint256 index) public view returns (uint256) {
-		require(false, stub_error);
-		index;
-		dummy;
-		return 0;
-	}
-
-	// Not implemented
-	//
-	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
-	function tokenOfOwnerByIndex(address owner, uint256 index)
-		public
-		view
-		returns (uint256)
-	{
-		require(false, stub_error);
-		owner;
-		index;
-		dummy;
-		return 0;
-	}
-
-	// @notice Count RFTs tracked by this contract
-	// @return A count of valid RFTs tracked by this contract, where each one of
-	//  them has an assigned and queryable owner not equal to the zero address
-	//
-	// Selector: totalSupply() 18160ddd
-	function totalSupply() public view returns (uint256) {
-		require(false, stub_error);
-		dummy;
-		return 0;
-	}
-}
-
-// Selector: 7c3bef89
+/// @title Unique extensions for ERC721.
+/// @dev the ERC-165 identifier for this interface is 0x7c3bef89
 contract ERC721UniqueExtensions is Dummy, ERC165 {
-	// @notice Transfer ownership of an RFT
-	// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
-	//  is the zero address. Throws if `tokenId` is not a valid RFT.
-	//  Throws if RFT pieces have multiple owners.
-	// @param to The new owner
-	// @param tokenId The RFT to transfer
-	// @param _value Not used for an RFT
-	//
-	// Selector: transfer(address,uint256) a9059cbb
+	/// @notice Transfer ownership of an RFT
+	/// @dev Throws unless `msg.sender` is the current owner. Throws if `to`
+	///  is the zero address. Throws if `tokenId` is not a valid RFT.
+	///  Throws if RFT pieces have multiple owners.
+	/// @param to The new owner
+	/// @param tokenId The RFT to transfer
+	/// @dev EVM selector for this function is: 0xa9059cbb,
+	///  or in textual repr: transfer(address,uint256)
 	function transfer(address to, uint256 tokenId) public {
 		require(false, stub_error);
 		to;
@@ -431,16 +483,15 @@
 		dummy = 0;
 	}
 
-	// @notice Burns a specific ERC721 token.
-	// @dev Throws unless `msg.sender` is the current owner or an authorized
-	//  operator for this RFT. Throws if `from` is not the current owner. Throws
-	//  if `to` is the zero address. Throws if `tokenId` is not a valid RFT.
-	//  Throws if RFT pieces have multiple owners.
-	// @param from The current owner of the RFT
-	// @param tokenId The RFT to transfer
-	// @param _value Not used for an RFT
-	//
-	// Selector: burnFrom(address,uint256) 79cc6790
+	/// @notice Burns a specific ERC721 token.
+	/// @dev Throws unless `msg.sender` is the current owner or an authorized
+	///  operator for this RFT. Throws if `from` is not the current owner. Throws
+	///  if `to` is the zero address. Throws if `tokenId` is not a valid RFT.
+	///  Throws if RFT pieces have multiple owners.
+	/// @param from The current owner of the RFT
+	/// @param tokenId The RFT to transfer
+	/// @dev EVM selector for this function is: 0x79cc6790,
+	///  or in textual repr: burnFrom(address,uint256)
 	function burnFrom(address from, uint256 tokenId) public {
 		require(false, stub_error);
 		from;
@@ -448,22 +499,22 @@
 		dummy = 0;
 	}
 
-	// @notice Returns next free RFT ID.
-	//
-	// Selector: nextTokenId() 75794a3c
+	/// @notice Returns next free RFT ID.
+	/// @dev EVM selector for this function is: 0x75794a3c,
+	///  or in textual repr: nextTokenId()
 	function nextTokenId() public view returns (uint256) {
 		require(false, stub_error);
 		dummy;
 		return 0;
 	}
 
-	// @notice Function to mint multiple tokens.
-	// @dev `tokenIds` should be an array of consecutive numbers and first number
-	//  should be obtained with `nextTokenId` method
-	// @param to The new owner
-	// @param tokenIds IDs of the minted RFTs
-	//
-	// Selector: mintBulk(address,uint256[]) 44a9945e
+	/// @notice Function to mint multiple tokens.
+	/// @dev `tokenIds` should be an array of consecutive numbers and first number
+	///  should be obtained with `nextTokenId` method
+	/// @param to The new owner
+	/// @param tokenIds IDs of the minted RFTs
+	/// @dev EVM selector for this function is: 0x44a9945e,
+	///  or in textual repr: mintBulk(address,uint256[])
 	function mintBulk(address to, uint256[] memory tokenIds)
 		public
 		returns (bool)
@@ -475,14 +526,14 @@
 		return false;
 	}
 
-	// @notice Function to mint multiple tokens with the given tokenUris.
-	// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive
-	//  numbers and first number should be obtained with `nextTokenId` method
-	// @param to The new owner
-	// @param tokens array of pairs of token ID and token URI for minted tokens
-	//
-	// Selector: mintBulkWithTokenURI(address,(uint256,string)[]) 36543006
-	function mintBulkWithTokenURI(address to, Tuple0[] memory tokens)
+	/// @notice Function to mint multiple tokens with the given tokenUris.
+	/// @dev `tokenIds` is array of pairs of token ID and token URI. Token IDs should be consecutive
+	///  numbers and first number should be obtained with `nextTokenId` method
+	/// @param to The new owner
+	/// @param tokens array of pairs of token ID and token URI for minted tokens
+	/// @dev EVM selector for this function is: 0x36543006,
+	///  or in textual repr: mintBulkWithTokenURI(address,(uint256,string)[])
+	function mintBulkWithTokenURI(address to, Tuple8[] memory tokens)
 		public
 		returns (bool)
 	{
@@ -493,11 +544,11 @@
 		return false;
 	}
 
-	// Returns EVM address for refungible token
-	//
-	// @param token ID of the token
-	//
-	// Selector: tokenContractAddress(uint256) ab76fac6
+	/// Returns EVM address for refungible token
+	///
+	/// @param token ID of the token
+	/// @dev EVM selector for this function is: 0xab76fac6,
+	///  or in textual repr: tokenContractAddress(uint256)
 	function tokenContractAddress(uint256 token) public view returns (address) {
 		require(false, stub_error);
 		token;
@@ -506,291 +557,247 @@
 	}
 }
 
-// Selector: ffe4da23
-contract Collection is Dummy, ERC165 {
-	// Set collection property.
-	//
-	// @param key Property key.
-	// @param value Propery value.
-	//
-	// Selector: setCollectionProperty(string,bytes) 2f073f66
-	function setCollectionProperty(string memory key, bytes memory value)
-		public
-	{
-		require(false, stub_error);
-		key;
-		value;
-		dummy = 0;
-	}
+/// @dev anonymous struct
+struct Tuple8 {
+	uint256 field_0;
+	string field_1;
+}
 
-	// Delete collection property.
-	//
-	// @param key Property key.
-	//
-	// Selector: deleteCollectionProperty(string) 7b7debce
-	function deleteCollectionProperty(string memory key) public {
+/// @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
+/// @dev See https://eips.ethereum.org/EIPS/eip-721
+/// @dev the ERC-165 identifier for this interface is 0x780e9d63
+contract ERC721Enumerable is Dummy, ERC165 {
+	/// @notice Enumerate valid RFTs
+	/// @param index A counter less than `totalSupply()`
+	/// @return The token identifier for the `index`th NFT,
+	///  (sort order not specified)
+	/// @dev EVM selector for this function is: 0x4f6ccce7,
+	///  or in textual repr: tokenByIndex(uint256)
+	function tokenByIndex(uint256 index) public view returns (uint256) {
 		require(false, stub_error);
-		key;
-		dummy = 0;
+		index;
+		dummy;
+		return 0;
 	}
 
-	// Get collection property.
-	//
-	// @dev Throws error if key not found.
-	//
-	// @param key Property key.
-	// @return bytes The property corresponding to the key.
-	//
-	// Selector: collectionProperty(string) cf24fd6d
-	function collectionProperty(string memory key)
+	/// Not implemented
+	/// @dev EVM selector for this function is: 0x2f745c59,
+	///  or in textual repr: tokenOfOwnerByIndex(address,uint256)
+	function tokenOfOwnerByIndex(address owner, uint256 index)
 		public
 		view
-		returns (bytes memory)
+		returns (uint256)
 	{
 		require(false, stub_error);
-		key;
+		owner;
+		index;
 		dummy;
-		return hex"";
+		return 0;
 	}
 
-	// Set the sponsor of the collection.
-	//
-	// @dev In order for sponsorship to work, it must be confirmed on behalf of the sponsor.
-	//
-	// @param sponsor Address of the sponsor from whose account funds will be debited for operations with the contract.
-	//
-	// Selector: setCollectionSponsor(address) 7623402e
-	function setCollectionSponsor(address sponsor) public {
+	/// @notice Count RFTs tracked by this contract
+	/// @return A count of valid RFTs tracked by this contract, where each one of
+	///  them has an assigned and queryable owner not equal to the zero address
+	/// @dev EVM selector for this function is: 0x18160ddd,
+	///  or in textual repr: totalSupply()
+	function totalSupply() public view returns (uint256) {
 		require(false, stub_error);
-		sponsor;
-		dummy = 0;
+		dummy;
+		return 0;
 	}
+}
 
-	// Collection sponsorship confirmation.
-	//
-	// @dev After setting the sponsor for the collection, it must be confirmed with this function.
-	//
-	// Selector: confirmCollectionSponsorship() 3c50e97a
-	function confirmCollectionSponsorship() public {
+/// @dev the ERC-165 identifier for this interface is 0x5b5e139f
+contract ERC721Metadata is Dummy, ERC165 {
+	/// @notice A descriptive name for a collection of RFTs in this contract
+	/// @dev EVM selector for this function is: 0x06fdde03,
+	///  or in textual repr: name()
+	function name() public view returns (string memory) {
 		require(false, stub_error);
-		dummy = 0;
+		dummy;
+		return "";
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"accountTokenOwnershipLimit",
-	// 	"sponsoredDataSize",
-	// 	"sponsoredDataRateLimit",
-	// 	"tokenLimit",
-	// 	"sponsorTransferTimeout",
-	// 	"sponsorApproveTimeout"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,uint32) 6a3841db
-	function setCollectionLimit(string memory limit, uint32 value) public {
+	/// @notice An abbreviated name for RFTs in this contract
+	/// @dev EVM selector for this function is: 0x95d89b41,
+	///  or in textual repr: symbol()
+	function symbol() public view returns (string memory) {
 		require(false, stub_error);
-		limit;
-		value;
-		dummy = 0;
+		dummy;
+		return "";
 	}
 
-	// Set limits for the collection.
-	// @dev Throws error if limit not found.
-	// @param limit Name of the limit. Valid names:
-	// 	"ownerCanTransfer",
-	// 	"ownerCanDestroy",
-	// 	"transfersEnabled"
-	// @param value Value of the limit.
-	//
-	// Selector: setCollectionLimit(string,bool) 993b7fba
-	function setCollectionLimit(string memory limit, bool value) public {
+	/// @notice A distinct Uniform Resource Identifier (URI) for a given asset.
+	///
+	/// @dev If the token has a `url` property and it is not empty, it is returned.
+	///  Else If the collection does not have a property with key `schemaName` or its value is not equal to `ERC721Metadata`, it return an error `tokenURI not set`.
+	///  If the collection property `baseURI` is empty or absent, return "" (empty string)
+	///  otherwise, if token property `suffix` present and is non-empty, return concatenation of baseURI and suffix
+	///  otherwise, return concatenation of `baseURI` and stringified token id (decimal stringifying, without paddings).
+	///
+	/// @return token's const_metadata
+	/// @dev EVM selector for this function is: 0xc87b56dd,
+	///  or in textual repr: tokenURI(uint256)
+	function tokenURI(uint256 tokenId) public view returns (string memory) {
 		require(false, stub_error);
-		limit;
-		value;
-		dummy = 0;
-	}
-
-	// Get contract address.
-	//
-	// Selector: contractAddress() f6b4dfb4
-	function contractAddress() public view returns (address) {
-		require(false, stub_error);
+		tokenId;
 		dummy;
-		return 0x0000000000000000000000000000000000000000;
+		return "";
 	}
+}
 
-	// Add collection admin by substrate address.
-	// @param new_admin Substrate administrator address.
-	//
-	// Selector: addCollectionAdminSubstrate(uint256) 5730062b
-	function addCollectionAdminSubstrate(uint256 newAdmin) public {
-		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
-	}
+/// @dev inlined interface
+contract ERC721Events {
+	event Transfer(
+		address indexed from,
+		address indexed to,
+		uint256 indexed tokenId
+	);
+	event Approval(
+		address indexed owner,
+		address indexed approved,
+		uint256 indexed tokenId
+	);
+	event ApprovalForAll(
+		address indexed owner,
+		address indexed operator,
+		bool approved
+	);
+}
 
-	// Remove collection admin by substrate address.
-	// @param admin Substrate administrator address.
-	//
-	// Selector: removeCollectionAdminSubstrate(uint256) 4048fcf9
-	function removeCollectionAdminSubstrate(uint256 admin) public {
+/// @title ERC-721 Non-Fungible Token Standard
+/// @dev See https://github.com/ethereum/EIPs/blob/master/EIPS/eip-721.md
+/// @dev the ERC-165 identifier for this interface is 0x58800161
+contract ERC721 is Dummy, ERC165, ERC721Events {
+	/// @notice Count all RFTs assigned to an owner
+	/// @dev RFTs assigned to the zero address are considered invalid, and this
+	///  function throws for queries about the zero address.
+	/// @param owner An address for whom to query the balance
+	/// @return The number of RFTs owned by `owner`, possibly zero
+	/// @dev EVM selector for this function is: 0x70a08231,
+	///  or in textual repr: balanceOf(address)
+	function balanceOf(address owner) public view returns (uint256) {
 		require(false, stub_error);
-		admin;
-		dummy = 0;
+		owner;
+		dummy;
+		return 0;
 	}
 
-	// Add collection admin.
-	// @param new_admin Address of the added administrator.
-	//
-	// Selector: addCollectionAdmin(address) 92e462c7
-	function addCollectionAdmin(address newAdmin) public {
+	/// @notice Find the owner of an RFT
+	/// @dev RFTs assigned to zero address are considered invalid, and queries
+	///  about them do throw.
+	///  Returns special 0xffffffffffffffffffffffffffffffffffffffff address for
+	///  the tokens that are partially owned.
+	/// @param tokenId The identifier for an RFT
+	/// @return The address of the owner of the RFT
+	/// @dev EVM selector for this function is: 0x6352211e,
+	///  or in textual repr: ownerOf(uint256)
+	function ownerOf(uint256 tokenId) public view returns (address) {
 		require(false, stub_error);
-		newAdmin;
-		dummy = 0;
+		tokenId;
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Remove collection admin.
-	//
-	// @param new_admin Address of the removed administrator.
-	//
-	// Selector: removeCollectionAdmin(address) fafd7b42
-	function removeCollectionAdmin(address admin) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x60a11672,
+	///  or in textual repr: safeTransferFromWithData(address,address,uint256,bytes)
+	function safeTransferFromWithData(
+		address from,
+		address to,
+		uint256 tokenId,
+		bytes memory data
+	) public {
 		require(false, stub_error);
-		admin;
+		from;
+		to;
+		tokenId;
+		data;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: 'Owner' else to nesting: 'Disabled'
-	//
-	// Selector: setCollectionNesting(bool) 112d4586
-	function setCollectionNesting(bool enable) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x42842e0e,
+	///  or in textual repr: safeTransferFrom(address,address,uint256)
+	function safeTransferFrom(
+		address from,
+		address to,
+		uint256 tokenId
+	) public {
 		require(false, stub_error);
-		enable;
+		from;
+		to;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Toggle accessibility of collection nesting.
-	//
-	// @param enable If "true" degenerates to nesting: {OwnerRestricted: [1, 2, 3]} else to nesting: 'Disabled'
-	// @param collections Addresses of collections that will be available for nesting.
-	//
-	// Selector: setCollectionNesting(bool,address[]) 64872396
-	function setCollectionNesting(bool enable, address[] memory collections)
-		public
-	{
-		require(false, stub_error);
-		enable;
-		collections;
-		dummy = 0;
-	}
-
-	// Set the collection access method.
-	// @param mode Access mode
-	// 	0 for Normal
-	// 	1 for AllowList
-	//
-	// Selector: setCollectionAccess(uint8) 41835d4c
-	function setCollectionAccess(uint8 mode) public {
+	/// @notice Transfer ownership of an RFT -- THE CALLER IS RESPONSIBLE
+	///  TO CONFIRM THAT `to` IS CAPABLE OF RECEIVING NFTS OR ELSE
+	///  THEY MAY BE PERMANENTLY LOST
+	/// @dev Throws unless `msg.sender` is the current owner or an authorized
+	///  operator for this RFT. Throws if `from` is not the current owner. Throws
+	///  if `to` is the zero address. Throws if `tokenId` is not a valid RFT.
+	///  Throws if RFT pieces have multiple owners.
+	/// @param from The current owner of the NFT
+	/// @param to The new owner
+	/// @param tokenId The NFT to transfer
+	/// @dev EVM selector for this function is: 0x23b872dd,
+	///  or in textual repr: transferFrom(address,address,uint256)
+	function transferFrom(
+		address from,
+		address to,
+		uint256 tokenId
+	) public {
 		require(false, stub_error);
-		mode;
-		dummy = 0;
-	}
-
-	// Add the user to the allowed list.
-	//
-	// @param user Address of a trusted user.
-	//
-	// Selector: addToCollectionAllowList(address) 67844fe6
-	function addToCollectionAllowList(address user) public {
-		require(false, stub_error);
-		user;
+		from;
+		to;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Remove the user from the allowed list.
-	//
-	// @param user Address of a removed user.
-	//
-	// Selector: removeFromCollectionAllowList(address) 85c51acb
-	function removeFromCollectionAllowList(address user) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x095ea7b3,
+	///  or in textual repr: approve(address,uint256)
+	function approve(address approved, uint256 tokenId) public {
 		require(false, stub_error);
-		user;
+		approved;
+		tokenId;
 		dummy = 0;
 	}
 
-	// Switch permission for minting.
-	//
-	// @param mode Enable if "true".
-	//
-	// Selector: setCollectionMintMode(bool) 00018e84
-	function setCollectionMintMode(bool mode) public {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0xa22cb465,
+	///  or in textual repr: setApprovalForAll(address,bool)
+	function setApprovalForAll(address operator, bool approved) public {
 		require(false, stub_error);
-		mode;
+		operator;
+		approved;
 		dummy = 0;
 	}
 
-	// Check that account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdmin(address) 9811b0c7
-	function isOwnerOrAdmin(address user) public view returns (bool) {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0x081812fc,
+	///  or in textual repr: getApproved(uint256)
+	function getApproved(uint256 tokenId) public view returns (address) {
 		require(false, stub_error);
-		user;
+		tokenId;
 		dummy;
-		return false;
+		return 0x0000000000000000000000000000000000000000;
 	}
 
-	// Check that substrate account is the owner or admin of the collection
-	//
-	// @param user account to verify
-	// @return "true" if account is the owner or admin
-	//
-	// Selector: isOwnerOrAdminSubstrate(uint256) 68910e00
-	function isOwnerOrAdminSubstrate(uint256 user) public view returns (bool) {
+	/// @dev Not implemented
+	/// @dev EVM selector for this function is: 0xe985e9c5,
+	///  or in textual repr: isApprovedForAll(address,address)
+	function isApprovedForAll(address owner, address operator)
+		public
+		view
+		returns (address)
+	{
 		require(false, stub_error);
-		user;
+		owner;
+		operator;
 		dummy;
-		return false;
-	}
-
-	// Returns collection type
-	//
-	// @return `Fungible` or `NFT` or `ReFungible`
-	//
-	// Selector: uniqueCollectionType() d34b55b8
-	function uniqueCollectionType() public returns (string memory) {
-		require(false, stub_error);
-		dummy = 0;
-		return "";
-	}
-
-	// Changes collection owner to another account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner account
-	//
-	// Selector: setOwner(address) 13af4035
-	function setOwner(address newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
-	}
-
-	// Changes collection owner to another substrate account
-	//
-	// @dev Owner can be changed only by current owner
-	// @param newOwner new owner substrate account
-	//
-	// Selector: setOwnerSubstrate(uint256) b212138f
-	function setOwnerSubstrate(uint256 newOwner) public {
-		require(false, stub_error);
-		newOwner;
-		dummy = 0;
+		return 0x0000000000000000000000000000000000000000;
 	}
 }