ERC-998 Composable Non-Fungible Token

DraftERCcreated 2018-07-07requires ERC-20, ERC-165, ERC-721

Extends a ERC-721 to own other ERC-721 and ERC-20 tokens.

Authors: Matt Lockyer, Nick Mudge, Jordan Schalm, sebastian echeverry, Zainan Victor Zhou (@xinbenlv)

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)`

Events (6)

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

`0x0371ddf2288ad1ba92626a7e31c86a9d006e592cfe57d7d946ef08b13457c08b`	`ReceivedChild(address,uint256,address,uint256)`
`0x0ef52e516fb5aec15a5d3587e5480481b702b26db93c8430eca78b61990fd3f6`	`TransferChild(uint256,address,address,uint256)`
`0x684ce28ace37552c6bfb98b7cceda8ed55327078eafb5dfb31218e0856382763`	`ReceivedERC20(address,uint256,address,uint256)`
`0xa8352277873fc0d2b233b8127433da351a4164fa701ed6ff79655694222932c4`	`TransferERC20(uint256,address,address,uint256)`
`0xda19c10bf4b88776cd85f9091592a44edff2d94035ec670ebd9e8356f56f887d`	`TransferToParent(address,uint256,uint256)`
`0x3c619d5b30fb8431c0c0094f4485f1859d63f222f36cc2104cc13e56c2b993d3`	`TransferFromParent(address,uint256,uint256)`

ERC-998 Composable Non-Fungible Token

ERC-165 interface ids

Functions this standard introduces (31)

Events (6)

Depends on (3)

What the specification covers

Compare with