git.delta.rocks / unique-network / refs/commits / b24c73be918e

--- a/pallets/common/src/erc.rs
+++ b/pallets/common/src/erc.rs
@@ -431,6 +431,27 @@
 		};
 		Ok(mode.into())
 	}
+
+	/// Changes collection owner
+	///
+	/// @dev Owner can be changed only by current owner
+	/// @param newOwner new owner
+	fn change_owner(&mut self, caller: caller, new_owner: address) -> Result<void> {
+		let caller = T::CrossAccountId::from_eth(caller);
+		let new_owner = T::CrossAccountId::from_eth(new_owner);
+		self.change_owner_internal(caller, new_owner)
+	}
+
+impl<T: Config> CollectionHandle<T>
+where
+	T::AccountId: From<[u8; 32]>,
+{
+
+	fn change_owner_internal(&mut self, caller: T::CrossAccountId, new_owner: T::CrossAccountId) -> Result<void> {
+		self.check_is_owner(&caller).map_err(dispatch_to_evm::<T>)?;
+		self.collection.owner = new_owner.as_sub().clone();
+		save(self)
+	}
 }
 
 fn check_is_owner_or_admin<T: Config>(
@@ -440,12 +461,13 @@
 	let caller = T::CrossAccountId::from_eth(caller);
 	collection
 		.check_is_owner_or_admin(&caller)
-		.map_err(pallet_evm_coder_substrate::dispatch_to_evm::<T>)?;
+		.map_err(dispatch_to_evm::<T>)?;
 	Ok(caller)
 }
 
 fn save<T: Config>(collection: &CollectionHandle<T>) -> Result<void> {
 	// TODO possibly delete for the lack of transaction
+	collection.consume_store_writes(1)?;
 	collection
 		.check_is_internal()
 		.map_err(dispatch_to_evm::<T>)?;

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--- a/pallets/fungible/src/stubs/UniqueFungible.sol
+++ b/pallets/fungible/src/stubs/UniqueFungible.sol
@@ -31,7 +31,103 @@
 	);
 }
 
-// Selector: 6cf113cd
+// 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: ca08c92c
 contract Collection is Dummy, ERC165 {
 	// Set collection property.
 	//
@@ -276,105 +372,21 @@
 	//
 	// Selector: uniqueCollectionType() d34b55b8
 	function uniqueCollectionType() public returns (string memory) {
-		require(false, stub_error);
-		dummy = 0;
-		return "";
-	}
-}
-
-// 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) {
+	// Changes collection owner
+	//
+	// @dev Owner can be changed only by current owner
+	// @param newOwner new owner
+	//
+	// Selector: changeOwner(address) a6f9dae1
+	function changeOwner(address newOwner) public {
 		require(false, stub_error);
-		spender;
-		amount;
+		newOwner;
 		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;
 	}
 }
 

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--- a/pallets/refungible/src/stubs/UniqueRefungible.sol
+++ b/pallets/refungible/src/stubs/UniqueRefungible.sol
@@ -371,7 +371,142 @@
 	}
 }
 
-// Selector: 6cf113cd
+// 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
+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
+	function transfer(address to, uint256 tokenId) public {
+		require(false, stub_error);
+		to;
+		tokenId;
+		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
+	function burnFrom(address from, uint256 tokenId) public {
+		require(false, stub_error);
+		from;
+		tokenId;
+		dummy = 0;
+	}
+
+	// @notice Returns next free RFT ID.
+	//
+	// Selector: nextTokenId() 75794a3c
+	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
+	function mintBulk(address to, uint256[] memory tokenIds)
+		public
+		returns (bool)
+	{
+		require(false, stub_error);
+		to;
+		tokenIds;
+		dummy = 0;
+		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)
+		public
+		returns (bool)
+	{
+		require(false, stub_error);
+		to;
+		tokens;
+		dummy = 0;
+		return false;
+	}
+
+	// Returns EVM address for refungible token
+	//
+	// @param token ID of the token
+	//
+	// Selector: tokenContractAddress(uint256) ab76fac6
+	function tokenContractAddress(uint256 token) public view returns (address) {
+		require(false, stub_error);
+		token;
+		dummy;
+		return 0x0000000000000000000000000000000000000000;
+	}
+}
+
+// Selector: ca08c92c
 contract Collection is Dummy, ERC165 {
 	// Set collection property.
 	//
@@ -620,140 +755,17 @@
 		dummy = 0;
 		return "";
 	}
-}
 
-// 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)
+	// Changes collection owner
 	//
-	// Selector: tokenByIndex(uint256) 4f6ccce7
-	function tokenByIndex(uint256 index) public view returns (uint256) {
-		require(false, stub_error);
-		index;
-		dummy;
-		return 0;
-	}
-
-	// Not implemented
+	// @dev Owner can be changed only by current owner
+	// @param newOwner new owner
 	//
-	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
-	function tokenOfOwnerByIndex(address owner, uint256 index)
-		public
-		view
-		returns (uint256)
-	{
+	// Selector: changeOwner(address) a6f9dae1
+	function changeOwner(address newOwner) public {
 		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
-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
-	function transfer(address to, uint256 tokenId) public {
-		require(false, stub_error);
-		to;
-		tokenId;
-		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
-	function burnFrom(address from, uint256 tokenId) public {
-		require(false, stub_error);
-		from;
-		tokenId;
-		dummy = 0;
-	}
-
-	// @notice Returns next free RFT ID.
-	//
-	// Selector: nextTokenId() 75794a3c
-	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
-	function mintBulk(address to, uint256[] memory tokenIds)
-		public
-		returns (bool)
-	{
-		require(false, stub_error);
-		to;
-		tokenIds;
-		dummy = 0;
-		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)
-		public
-		returns (bool)
-	{
-		require(false, stub_error);
-		to;
-		tokens;
+		newOwner;
 		dummy = 0;
-		return false;
-	}
-
-	// Returns EVM address for refungible token
-	//
-	// @param token ID of the token
-	//
-	// Selector: tokenContractAddress(uint256) ab76fac6
-	function tokenContractAddress(uint256 token) public view returns (address) {
-		require(false, stub_error);
-		token;
-		dummy;
-		return 0x0000000000000000000000000000000000000000;
 	}
 }
 

--- a/tests/src/eth/api/UniqueFungible.sol
+++ b/tests/src/eth/api/UniqueFungible.sol
@@ -22,7 +22,50 @@
 	);
 }
 
-// Selector: 6cf113cd
+// Selector: 79cc6790
+interface ERC20UniqueExtensions is Dummy, ERC165 {
+	// Selector: burnFrom(address,uint256) 79cc6790
+	function burnFrom(address from, uint256 amount) external returns (bool);
+}
+
+// Selector: 942e8b22
+interface ERC20 is Dummy, ERC165, ERC20Events {
+	// Selector: name() 06fdde03
+	function name() external view returns (string memory);
+
+	// Selector: symbol() 95d89b41
+	function symbol() external view returns (string memory);
+
+	// Selector: totalSupply() 18160ddd
+	function totalSupply() external view returns (uint256);
+
+	// Selector: decimals() 313ce567
+	function decimals() external view returns (uint8);
+
+	// Selector: balanceOf(address) 70a08231
+	function balanceOf(address owner) external view returns (uint256);
+
+	// Selector: transfer(address,uint256) a9059cbb
+	function transfer(address to, uint256 amount) external returns (bool);
+
+	// Selector: transferFrom(address,address,uint256) 23b872dd
+	function transferFrom(
+		address from,
+		address to,
+		uint256 amount
+	) external returns (bool);
+
+	// Selector: approve(address,uint256) 095ea7b3
+	function approve(address spender, uint256 amount) external returns (bool);
+
+	// Selector: allowance(address,address) dd62ed3e
+	function allowance(address owner, address spender)
+		external
+		view
+		returns (uint256);
+}
+
+// Selector: ca08c92c
 interface Collection is Dummy, ERC165 {
 	// Set collection property.
 	//
@@ -183,49 +226,14 @@
 	//
 	// Selector: uniqueCollectionType() d34b55b8
 	function uniqueCollectionType() external returns (string memory);
-}
 
-// Selector: 79cc6790
-interface ERC20UniqueExtensions is Dummy, ERC165 {
-	// Selector: burnFrom(address,uint256) 79cc6790
-	function burnFrom(address from, uint256 amount) external returns (bool);
-}
-
-// Selector: 942e8b22
-interface ERC20 is Dummy, ERC165, ERC20Events {
-	// Selector: name() 06fdde03
-	function name() external view returns (string memory);
-
-	// Selector: symbol() 95d89b41
-	function symbol() external view returns (string memory);
-
-	// Selector: totalSupply() 18160ddd
-	function totalSupply() external view returns (uint256);
-
-	// Selector: decimals() 313ce567
-	function decimals() external view returns (uint8);
-
-	// Selector: balanceOf(address) 70a08231
-	function balanceOf(address owner) external view returns (uint256);
-
-	// Selector: transfer(address,uint256) a9059cbb
-	function transfer(address to, uint256 amount) external returns (bool);
-
-	// Selector: transferFrom(address,address,uint256) 23b872dd
-	function transferFrom(
-		address from,
-		address to,
-		uint256 amount
-	) external returns (bool);
-
-	// Selector: approve(address,uint256) 095ea7b3
-	function approve(address spender, uint256 amount) external returns (bool);
-
-	// Selector: allowance(address,address) dd62ed3e
-	function allowance(address owner, address spender)
-		external
-		view
-		returns (uint256);
+	// Changes collection owner
+	//
+	// @dev Owner can be changed only by current owner
+	// @param newOwner new owner
+	//
+	// Selector: changeOwner(address) a6f9dae1
+	function changeOwner(address newOwner) external;
 }
 
 interface UniqueFungible is

--- a/tests/src/eth/api/UniqueNFT.sol
+++ b/tests/src/eth/api/UniqueNFT.sol
@@ -250,7 +250,33 @@
 	function finishMinting() external returns (bool);
 }
 
-// Selector: 6cf113cd
+// Selector: 780e9d63
+interface 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) external view returns (uint256);
+
+	// @dev Not implemented
+	//
+	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
+	function tokenOfOwnerByIndex(address owner, uint256 index)
+		external
+		view
+		returns (uint256);
+
+	// @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() external view returns (uint256);
+}
+
+// Selector: ca08c92c
 interface Collection is Dummy, ERC165 {
 	// Set collection property.
 	//
@@ -411,32 +437,14 @@
 	//
 	// Selector: uniqueCollectionType() d34b55b8
 	function uniqueCollectionType() external returns (string memory);
-}
 
-// Selector: 780e9d63
-interface 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)
+	// Changes collection owner
 	//
-	// Selector: tokenByIndex(uint256) 4f6ccce7
-	function tokenByIndex(uint256 index) external view returns (uint256);
-
-	// @dev Not implemented
+	// @dev Owner can be changed only by current owner
+	// @param newOwner new owner
 	//
-	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
-	function tokenOfOwnerByIndex(address owner, uint256 index)
-		external
-		view
-		returns (uint256);
-
-	// @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() external view returns (uint256);
+	// Selector: changeOwner(address) a6f9dae1
+	function changeOwner(address newOwner) external;
 }
 
 // Selector: d74d154f

--- a/tests/src/eth/api/UniqueRefungible.sol
+++ b/tests/src/eth/api/UniqueRefungible.sol
@@ -248,7 +248,96 @@
 	function finishMinting() external returns (bool);
 }
 
-// Selector: 6cf113cd
+// Selector: 780e9d63
+interface 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) external view returns (uint256);
+
+	// Not implemented
+	//
+	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
+	function tokenOfOwnerByIndex(address owner, uint256 index)
+		external
+		view
+		returns (uint256);
+
+	// @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() external view returns (uint256);
+}
+
+// Selector: 7c3bef89
+interface 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
+	function transfer(address to, uint256 tokenId) external;
+
+	// @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
+	function burnFrom(address from, uint256 tokenId) external;
+
+	// @notice Returns next free RFT ID.
+	//
+	// Selector: nextTokenId() 75794a3c
+	function nextTokenId() external view returns (uint256);
+
+	// @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
+	function mintBulk(address to, uint256[] memory tokenIds)
+		external
+		returns (bool);
+
+	// @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)
+		external
+		returns (bool);
+
+	// Returns EVM address for refungible token
+	//
+	// @param token ID of the token
+	//
+	// Selector: tokenContractAddress(uint256) ab76fac6
+	function tokenContractAddress(uint256 token)
+		external
+		view
+		returns (address);
+}
+
+// Selector: ca08c92c
 interface Collection is Dummy, ERC165 {
 	// Set collection property.
 	//
@@ -409,95 +498,14 @@
 	//
 	// Selector: uniqueCollectionType() d34b55b8
 	function uniqueCollectionType() external returns (string memory);
-}
-
-// Selector: 780e9d63
-interface 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) external view returns (uint256);
-
-	// Not implemented
-	//
-	// Selector: tokenOfOwnerByIndex(address,uint256) 2f745c59
-	function tokenOfOwnerByIndex(address owner, uint256 index)
-		external
-		view
-		returns (uint256);
-
-	// @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() external view returns (uint256);
-}
 
-// Selector: 7c3bef89
-interface 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
-	function transfer(address to, uint256 tokenId) external;
-
-	// @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
-	function burnFrom(address from, uint256 tokenId) external;
-
-	// @notice Returns next free RFT ID.
-	//
-	// Selector: nextTokenId() 75794a3c
-	function nextTokenId() external view returns (uint256);
-
-	// @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
-	function mintBulk(address to, uint256[] memory tokenIds)
-		external
-		returns (bool);
-
-	// @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
+	// Changes collection owner
 	//
-	// Selector: mintBulkWithTokenURI(address,(uint256,string)[]) 36543006
-	function mintBulkWithTokenURI(address to, Tuple0[] memory tokens)
-		external
-		returns (bool);
-
-	// Returns EVM address for refungible token
-	//
-	// @param token ID of the token
+	// @dev Owner can be changed only by current owner
+	// @param newOwner new owner
 	//
-	// Selector: tokenContractAddress(uint256) ab76fac6
-	function tokenContractAddress(uint256 token)
-		external
-		view
-		returns (address);
+	// Selector: changeOwner(address) a6f9dae1
+	function changeOwner(address newOwner) external;
 }
 
 interface UniqueRefungible is

--- a/tests/src/eth/collectionAdmin.test.ts
+++ b/tests/src/eth/collectionAdmin.test.ts
@@ -15,6 +15,7 @@
 
 import {expect} from 'chai';
 import privateKey from '../substrate/privateKey';
+import { UNIQUE } from '../util/helpers';
 import {
   createEthAccount,
   createEthAccountWithBalance, 
@@ -22,6 +23,7 @@
   evmCollectionHelpers, 
   getCollectionAddressFromResult, 
   itWeb3,
+  recordEthFee,
 } from './util/helpers';
 
 describe('Add collection admins', () => {
@@ -309,4 +311,51 @@
     expect(adminList[0].asSubstrate.toString().toLocaleLowerCase())
       .to.be.eq(adminSub.address.toLocaleLowerCase());
   });
+});
+
+describe('Change owner tests', () => {
+  itWeb3('Change owner', async ({api, web3, privateKeyWrapper}) => {
+    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const newOwner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const collectionHelper = evmCollectionHelpers(web3, owner);
+    const result = await collectionHelper.methods
+      .createNonfungibleCollection('A', 'B', 'C')
+      .send();
+    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
+    const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
+  
+    await collectionEvm.methods.changeOwner(newOwner).send();
+  
+    expect(await collectionEvm.methods.verifyOwnerOrAdmin(owner).call()).to.be.false;
+    expect(await collectionEvm.methods.verifyOwnerOrAdmin(newOwner).call()).to.be.true;
+  });
+
+  itWeb3('change owner call fee', async ({web3, api, privateKeyWrapper}) => {
+    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const newOwner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const collectionHelper = evmCollectionHelpers(web3, owner);
+    const result = await collectionHelper.methods
+      .createNonfungibleCollection('A', 'B', 'C')
+      .send();
+    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
+    const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
+
+    const cost = await recordEthFee(api, owner, () => collectionEvm.methods.changeOwner(newOwner).send());
+    expect(cost < BigInt(0.2 * Number(UNIQUE)));
+    expect(cost > 0);
+  });
+
+  itWeb3('(!negative tests!) call changeOwner by not owner', async ({api, web3, privateKeyWrapper}) => {
+    const owner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const newOwner = await createEthAccountWithBalance(api, web3, privateKeyWrapper);
+    const collectionHelper = evmCollectionHelpers(web3, owner);
+    const result = await collectionHelper.methods
+      .createNonfungibleCollection('A', 'B', 'C')
+      .send();
+    const {collectionIdAddress} = await getCollectionAddressFromResult(api, result);
+    const collectionEvm = evmCollection(web3, owner, collectionIdAddress);
+  
+    await expect(collectionEvm.methods.changeOwner(newOwner).send({from: newOwner})).to.be.rejected;
+    expect(await collectionEvm.methods.verifyOwnerOrAdmin(newOwner).call()).to.be.false;
+  });
 });
\ No newline at end of file

--- a/tests/src/eth/fungibleAbi.json
+++ b/tests/src/eth/fungibleAbi.json
@@ -116,6 +116,15 @@
     "type": "function"
   },
   {
+    "inputs": [
+      { "internalType": "address", "name": "newOwner", "type": "address" }
+    ],
+    "name": "changeOwner",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
     "inputs": [{ "internalType": "string", "name": "key", "type": "string" }],
     "name": "collectionProperty",
     "outputs": [{ "internalType": "bytes", "name": "", "type": "bytes" }],

--- a/tests/src/eth/nonFungibleAbi.json
+++ b/tests/src/eth/nonFungibleAbi.json
@@ -146,6 +146,15 @@
     "type": "function"
   },
   {
+    "inputs": [
+      { "internalType": "address", "name": "newOwner", "type": "address" }
+    ],
+    "name": "changeOwner",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
     "inputs": [{ "internalType": "string", "name": "key", "type": "string" }],
     "name": "collectionProperty",
     "outputs": [{ "internalType": "bytes", "name": "", "type": "bytes" }],

--- a/tests/src/eth/reFungibleAbi.json
+++ b/tests/src/eth/reFungibleAbi.json
@@ -146,6 +146,15 @@
     "type": "function"
   },
   {
+    "inputs": [
+      { "internalType": "address", "name": "newOwner", "type": "address" }
+    ],
+    "name": "changeOwner",
+    "outputs": [],
+    "stateMutability": "nonpayable",
+    "type": "function"
+  },
+  {
     "inputs": [{ "internalType": "string", "name": "key", "type": "string" }],
     "name": "collectionProperty",
     "outputs": [{ "internalType": "bytes", "name": "", "type": "bytes" }],