随着区块链的发展，NFT也逐渐传入国内（数字藏品），大家都很好奇数藏APP是怎样开发出来的。今天就数藏APP开发过程中容易遇到的细节问题来简单说一下数藏APP开发过程中的注意点。 The full name of the digital collection is Non-FungibleToken,abbreviated as NFT,which is a non-homogeneous token.The concept of NFT comes from foreign countries.It is a customized work using blockchain technology.The artwork forms a separate digital certificate.The authorization code is the information that protects copyright,and completes digital distribution,purchase,collection and use.The one-key digital collection of works is like a commodity,which is independent,indivisible,tamper-proof,verifiable and scarce. 我们做的主要修改是增加一个Token ID到URL的映射。因为我们准备将NFT的图片和Metadata数据都放到IPFS上，所以增加一个Token ID到IPFS文件哈希的映射： contract ERC1155{ mapping(uint256=>string)private _metadataHashes; string private _uriPrefix=“”; //返回”QmasWH…re2Ych?filename=metadata.json” //如果使用服务器API返回则可以固定uri为”{id}” function uri(uint256 id)public view returns(string memory){ return _concat(_uriPrefix,_metadataHashes[id],“?filename=metadata.json”); } } 第二个修改是增加一个mint()方法来铸造NFT： function mint(uint256 amount,string memory metadataHash)public returns(uint256){ //如果只允许合约部署者铸造，加上判断: //require(msg.sender==owner,“Not contract owner”); nextTokenId++; uint256 tokenId=nextTokenId; _metadataHashes[tokenId]=metadataHash; _mint(msg.sender,tokenId,amount,“”); return tokenId; } 最后一步是在isApprovedForAll()中判断下当前转移操作的发起者是不是OpenSea的代理合约： function isApprovedForAll(address account,address operator)public view returns(bool){ //Whitelist OpenSea proxy contract for easy trading. ProxyRegistry proxyRegistry=ProxyRegistry(proxyRegistryAddress); if(address(proxyRegistry.proxies(account))==operator){ return true; } return _operatorApprovals[account][operator]; } 这么做的目的是将来在OpenSea售卖的时候，不需要
