ClubCard

Programmable ownership

Transferrable ownership

• ClubCardERC721.sol: allow the holder of a designated ERC-721 NFT to sign transactions

Threshold ownership

• ClubCardERC20.sol: allow holders of a minimum balance of ERC-20 tokens to sign transactions
• ClubCardERC1155.sol: allow holders of a minimum balance of ERC-1155 tokens to sign transactions

Programmable ownership

• ClubCardBase.sol: implement custom ownership terms by extending this abstract contract

EIP-1271 signatures

ClubCardBase implements the EIP-1271 interface. It validates that a given ECDSA signature is from the expected account where the expected account is derived using the isCardHolder that inheriting contracts must implement.

Additionally, it supports validation of EIP-1271 contract signatures, which are expected to be given in the following format based on ECDSA {r, s, v} components with v = 0 as the recovery identifier:

0x000000000000000000000000<20 bytes smart contract address>>>>>>>>  // r component: the address of signing EIP-1271 contract
  0000000000000000000000000000000000000000000000000000000000000041  // s component: constant 65 bytes offset to signature data
  00                                                                // v component: constant unpadded `0` as recovery identifier
  00000000000000000000000000000000<length of signature data bytes>
  <bytes of signature data ....>