ContentHashResolver

mapping(uint256 => mapping(bytes32 => bytes)) versionable_hashes;

function contenthash(bytes32 _node) public view returns (bytes memory);

function incrementVersion(bytes32 node) public virtual override authorised(node);

function setContentHash(bytes32 _node, bytes calldata _hash) public authorised(_node);

function supportsInterface(bytes4 _interfaceId) public view virtual override returns (bool);