ERC-4519 Non-Fungible Tokens Tied to Physical Assets

FinalERCcreated 2021-12-03requires ERC-165, ERC-721

Interface for non-fungible tokens representing physical assets that can generate or recover their own accounts and obey users.

Authors: Javier Arcenegui (@Hardblock-IMSE-CNM), Rosario Arjona (@RosarioArjona), Roberto Román, Iluminada Baturone (@lumi2018)

ERC-165 interface ids

Computed here as the XOR of the selectors each interface defines.

EIP	`0x8a68abe3`

`0x5329c681`	`checkTimeout(uint256)`
`0xad2661fc`	`ownerEngagement(uint256)`	payable
`0xf7b44a0f`	`ownerOfFromBCA(address)`	view
`0x0b6df367`	`setTimeout(uint256,uint256)`
`0xdb4d295b`	`setUser(uint256,address)`	payable
`0x128da698`	`startOwnerEngagement(uint256,uint256,uint256)`	payable
`0xadadaf40`	`startUserEngagement(uint256,uint256,uint256)`	payable
`0xe61e3a76`	`tokenFromBCA(address)`	view
`0x1c5be3d7`	`updateTimestamp()`
`0x0cb22289`	`userBalanceOf(address)`	view
`0x5a9f8682`	`userBalanceOfAnOwner(address,address)`	view
`0x531f2bcd`	`userEngagement(uint256)`	payable
`0xc2f1f14a`	`userOf(uint256)`	view
`0xd1553258`	`userOfFromBCA(address)`	view

`0x095ea7b3`	`approve(address,uint256)`	ERC-721
`0x70a08231`	`balanceOf(address)`	ERC-721
`0x081812fc`	`getApproved(uint256)`	ERC-721
`0xe985e9c5`	`isApprovedForAll(address,address)`	ERC-721
`0x6352211e`	`ownerOf(uint256)`	ERC-721
`0xb88d4fde`	`safeTransferFrom(address,address,uint256,bytes)`	ERC-721
`0x42842e0e`	`safeTransferFrom(address,address,uint256)`	ERC-721
`0xa22cb465`	`setApprovalForAll(address,bool)`	ERC-721
`0x01ffc9a7`	`supportsInterface(bytes4)`	ERC-165
`0x23b872dd`	`transferFrom(address,address,uint256)`	ERC-721

Topic0 is the keccak256 hash of the signature, which is what a log filter matches on.

`0xa366111dc7688b9ffb71476107b8b733fd141e7b370cff8480c03f4ec4409cd7`	`UserAssigned(uint256,address)`
`0x0a74f4ab94fad84ffc38a74f59789bf53235489daa6ae3b0010116780c1588a4`	`UserEngaged(uint256)`
`0xd0582651f57ffea78c4fa2df3eaf04bf2ff083277a6c1145411c72b9c1dc474c`	`OwnerEngaged(uint256)`
`0x7e1636e7e3d95ceaa354ed9d47ea056b46cbcc0c448b26c6efaac0af33100305`	`TimeoutAlarm(uint256)`