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SongNFT

The SongNFT contract is an ERC-721 implementation for song ownership.

Features​

  • Signature-based minting
  • Metadata storage (IPFS URI + audio hash)
  • Publishing status tracking
  • Trading status tracking
  • Linked token address

Interface​

interface ISongNFT {
    function mint(
        string calldata metadataURI,
        bytes32 audioHash,
        bytes calldata signature
    ) external returns (uint256);

    function publish(uint256 tokenId) external;

    function isPublished(uint256 tokenId) external view returns (bool);

    function isTradeable(uint256 tokenId) external view returns (bool);

    function linkedToken(uint256 tokenId) external view returns (address);
}

Signature Verification​

bytes32 hash = keccak256(abi.encodePacked(msg.sender, metadataURI, audioHash));
address signer = ECDSA.recover(hash, signature);
require(signer == platformSigner, "Invalid signature");

Events​

event SongMinted(uint256 indexed tokenId, address indexed creator, string metadataURI);
event SongPublished(uint256 indexed tokenId);
event TradingEnabled(uint256 indexed tokenId, address tokenAddress);

Storage​

mapping(uint256 => bool) public isPublished;
mapping(uint256 => bool) public isTradeable;
mapping(uint256 => address) public linkedToken;
mapping(bytes => bool) public usedSignatures;