ERC-721 Non-Fungible Token Standard

FinalERCcreated 2018-01-24146 later proposals build on itrequires ERC-165

Authors: William Entriken (@fulldecent), Dieter Shirley, Jacob Evans, Nastassia Sachs

ERC-165 interface ids

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

ERC721 0x80ac58cd

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

0x01ffc9a7 supportsInterface(bytes4) ERC-165

Interfaces the spec defines alongside the core one, which an implementation may or may not carry.

0x01ffc9a7 supportsInterface(bytes4)

`0x18160ddd`	`totalSupply()`
`0x4f6ccce7`	`tokenByIndex(uint256)`
`0x2f745c59`	`tokenOfOwnerByIndex(address,uint256)`

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

`0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef`	`Transfer(address,address,uint256)`
`0x8c5be1e5ebec7d5bd14f71427d1e84f3dd0314c0f7b2291e5b200ac8c7c3b925`	`Approval(address,address,uint256)`
`0x17307eab39ab6107e8899845ad3d59bd9653f200f220920489ca2b5937696c31`	`ApprovalForAll(address,address,bool)`

Proposals this one names in its requires field.

Later proposals that name this one in their requires field.