ERC-721 vs ERC-4519

Non-Fungible Token Standard compared with Non-Fungible Tokens Tied to Physical Assets.

ERC-4519 is a strict superset of ERC-721

10 shared · 10 vs 24 functions · 100% of the smaller surface

🤝 Shared (10)

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

None.

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

Both surfaces parsed from the canonical specifications: ERC-721 · ERC-4519