Create EIP-5298: ENS Trust to hold NFTs under ENS name

EIPS/eip-5298.md

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+---
+eip: 5298
+title: ENS as Token Holder
+description: An interface for holding tokens by ENS.
+author: Zainan Victor Zhou (@xinbenlv)
+discussions-to: https://ethereum-magicians.org/t/erc-eip-5198-ens-as-token-holder/10374
+status: Draft
+type: Standards Track
+category: ERC
+created: 2022-07-12
+requires: 137, 721, 1155
+---
+
+## Abstract
+An interface for smart contract to become a holder of tokens by honoring ENS ownership.
+This specification supports [EIP-721](./eip-721.md) and [EIP-1155](./eip-1155.md) tokens and is expandable to future token standard or other standard.
+
+## Motivation
+Currently, if someone wants to receive a token, they have to set up a wallet address. By creating a smart contract that conforms to this interface specification, it is possible to decouple the transfer of ownership from the existence of wallet addresses.
+
+## Specification
+
+1. Any conforming smart contract must conform to `ERC721TokenReceiver` defined in [EIP-721](./eip-721.md) and `ERC1155TokenReceiver` defined in [EIP-1155](./eip-1155.md).
+
+```solidity
+interface IERC_ENS_AS_HOLDER is ERC721Receiver, ERC1155Receiver {
+}
+```
+
+## Rationale
+1. We choose ENS because it's a scoped ownership namespace.
+This ERC shall also be able to work in other scoped ownership namespace approach.
+
+## Backwards Compatibility
+No backward compatibility issues were found.
+
+## Reference Implementation
+```solidity
+contract ENSTokenHolding is ERC721TokenReceiver, Initializable {
+  address ENSRootRegistry _ensRoot;
+  mapping<address /* of ERC721 */ => tokenId=> string /* of owner*/)> _erc721TokenHolders;
+
+function initializer(address ensRoot) {
+_ensRoot = ensRoot;
+}
+
+function onERC721Received(address _operator, address _from, uint256 _tokenId, bytes _data) external returns(bytes4) {
+  _erc721TokenHolders[_operator][_tokenId] = "0x" + msg.sender.toString();
+
+  return /*bytes4 comply to ERC721 onReceived*/
+}
+
+function setOwner(address erc721, uint256 tokenId, string ens) {
+  require(msg.sender.toString == "0x" + _erc721TokenHolders[erc721][tokenId]);
+  _erc721TokenHolders[erc721][tokenId] = newOwnerENS;
+}
+
+function claim(address erc721, uint256 tokenId) {
+  require(msg.sender.toString == "0x" + _erc721TokenHolders[erc721][tokenId]
+    || _ensRoot.reverseLookup() == /*stored ens*);
+  ERC721 contract = ERC721(erc721);
+  erc721.safeTransferFrom(this, msg.sender, tokenId);
+);
+}
+```
+
+## Security Considerations
+Needs discussion
+
+## Copyright
+Copyright and related rights waived via [CC0](../LICENSE.md).