IERC721Permit

Extension to ERC721 that includes a permit function for signature based approvals

Functions​

PERMIT_TYPEHASH​

  function PERMIT_TYPEHASH(
  ) external returns (bytes32)

The permit typehash used in the permit signature

Return Values:​

Type	Description
bytes32	typehash for the permit

DOMAIN_SEPARATOR​

  function DOMAIN_SEPARATOR(
  ) external returns (bytes32)

The domain separator used in the permit signature

Return Values:​

Name	Type	Description
The		domain seperator used in encoding of permit signature

permit​

  function permit(
    address spender,
    uint256 tokenId,
    uint256 deadline,
    uint8 v,
    bytes32 r,
    bytes32 s
  ) external

Approve of a specific token ID for spending by spender via signature

Parameters:​

Name	Type	Description
spender	address	The account that is being approved
tokenId	uint256	The ID of the token that is being approved for spending
deadline	uint256	The deadline timestamp by which the call must be mined for the approve to work
v	uint8	Must produce valid secp256k1 signature from the holder along with r and s
r	bytes32	Must produce valid secp256k1 signature from the holder along with v and s
s	bytes32	Must produce valid secp256k1 signature from the holder along with r and v