@solana/web3.js ERC721元数据有API吗?

@solana/web3.js Is there an API for ERC721 Metadata?

给定一个代币铸造地址,我正在寻找一种方法来访问 ERC721 代币的元数据。 @solana/web3.js中有没有API?

不,目前没有 API,但是 phantom wallet uses the metaplex on-chain program at: "metaqbxxUerdq28cj1RbAWkYQm3ybzjb6a8bt518x1s" to get the info it needs about the NFT which is hosted on arweave 和相应的数据帐户。

Solana 将代币元数据存储在从原始代币地址派生的地址中 https://docs.solana.com/developing/programming-model/calling-between-programs#hash-based-generated-program-addresses

参考代码是 rust,这里是 @solana/web3.js 的实现。
(source)

  static async findProgramAddress(
    seeds: Array<Buffer | Uint8Array>,
    programId: PublicKey,
  ): Promise<[PublicKey, number]> {
    let nonce = 255;
    let address;
    while (nonce != 0) {
      try {
        const seedsWithNonce = seeds.concat(Buffer.from([nonce]));
        address = await this.createProgramAddress(seedsWithNonce, programId);
      } catch (err) {
        if (err instanceof TypeError) {
          throw err;
        }
        nonce--;
        continue;
      }
      return [address, nonce];
    }
    throw new Error(`Unable to find a viable program address nonce`);
  }

请注意,元数据使用 borsh library, as per https://docs.metaplex.com/nft-standard#token-metadata-program.

以 base64 编码

这是一个仅使用 borsh 和@solana/web3.js 检索和解析元数据的简洁实现 https://gist.github.com/dvcrn/c099c9b5a095ffe4ddb6481c22cde5f4

最后,MagicDen 有一个 returns 元数据的端点: https://api-mainnet.magiceden.io/rpc/getNFTByMintAddress/DugthRKbQZRMcDQQfjnj2HeSjz2VARPC8H9abxdNK2SS

不,但可以通过区块链 API 获得一个:https://docs.theblockchainapi.com/#tag/Solana-NFT/paths/~1v1~1solana~1nft/get

您只需提供 mint_address 并取回元数据。很简单!