ERC-998 Composable Non-Fungible Token

🆔 ERC-165 interface ids

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

ERC998ERC721TopDown	`0xcde244d9`
ERC998ERC721TopDownEnumerable	`0xa344afe4`
ERC998ERC20TopDown	`0x7294ffed`
ERC998ERC20TopDownEnumerable	`0xc5fd96cd`
ERC998ERC721BottomUp	`0xa1b23002`
ERC998ERC721BottomUpEnumerable	`0x8318b539`
ERC998ERC20BottomUp	`0x3617a1cb`

⚠️ The spec asserts 0xffafa991 for ERC998ERC20BottomUp, which its own interface does not produce.

Asserted value is the XOR of only 4 of the 5 declared functions; it predates transferFromParentERC223(address,uint256,address,uint256,bytes).

⚙️ Functions this standard introduces (31)

`0xe226ed22`	`balanceOfERC20(uint256,address)`	view
`0xe380b7bd`	`balanceOfToken(address,uint256)`	view
`0x0d5a621b`	`childContractByIndex(uint256,uint256)`	view
`0x051847d5`	`childTokenByIndex(address,uint256,uint256)`	view
`0x160b01a1`	`childTokenByIndex(uint256,address,uint256)`	view
`0x627c81ff`	`erc20ContractByIndex(uint256,uint256)`	view
`0xba6b5f96`	`getChild(address,uint256,address,uint256)`
`0x07cff6f2`	`getERC20(address,uint256,address,uint256)`
`0x150b7a02`	`onERC721Received(address,address,uint256,bytes)`
`0xeadb80b8`	`ownerOfChild(address,uint256)`	view
`0x43a61a8e`	`rootOwnerOf(uint256)`	view
`0xed81cdda`	`rootOwnerOfChild(address,uint256)`	view
`0x8d81f51e`	`safeTransferChild(uint256,address,address,uint256,bytes)`
`0x1d98f3c5`	`safeTransferChild(uint256,address,address,uint256)`
`0xc0ee0b8a`	`tokenFallback(address,uint256,bytes)`
`0x89885a59`	`tokenOwnerOf(uint256)`	view
`0x8da7d0b5`	`totalChildContracts(uint256)`	view
`0x8600f2ec`	`totalChildTokens(address,uint256)`	view
`0x35b21ceb`	`totalChildTokens(uint256,address)`	view
`0xa7811732`	`totalERC20Contracts(uint256)`	view
`0xc0a899f2`	`transferAsChild(address,uint256,address,uint256,uint256,bytes)`
`0x737bf30f`	`transferAsChild(address,uint256,address,uint256,uint256)`
`0xbef44f18`	`transferChild(uint256,address,address,uint256)`
`0x08937f62`	`transferChildToParent(uint256,address,uint256,address,uint256,bytes)`
`0x830ef41b`	`transferERC20(uint256,address,address,uint256)`
`0xd49d1bac`	`transferERC223(uint256,address,address,uint256,bytes)`
`0x5e3e2687`	`transferFromParent(address,uint256,address,uint256,bytes)`
`0x5438496f`	`transferFromParent(address,uint256,address,uint256)`
`0xc9b8085a`	`transferFromParentERC223(address,uint256,address,uint256,bytes)`
`0xf50acfa0`	`transferToParent(address,address,uint256,uint256,bytes)`
`0x3b6ca44c`	`transferToParent(address,address,uint256,uint256)`

⚖️ Compare with

Parsed from the canonical specification · discussion