ERC-6551: Non-fungible Token Bound Accounts

ERCs
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Another thoughts is that instead of putting implementation as a param of all functions of IERC6551Registry, is it better to extract it out as a general view function so all accounts registered by this registry are guaranteed to share same implementation? It may not be as flexible as current version but it will prevent potential fragmented implementations, making it more easier to integrate.

The new interface will look like this:

interface IERC6551Registry {
    event AccountCreated(
        address tokenContract,
        uint256 tokenId
    );

    function createAccount(
        address tokenContract,
        uint256 tokenId
    ) external returns (address);

    function getImplementation() external returns (address);

    function account(
        address tokenContract,
        uint256 tokenId
    ) external view returns (address);
}

interface IERC6551Account {
    receive() external payable;

    function token()
        external
        view
        returns (address tokenContract, uint256 tokenId);
}
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