SmartContract: An NFT Contract that claim need to aprove by Contract Owner

[leeduckgo]

ERC721Enumable

function:

claim(ar_link)

After user claim, need owner to confirmed, to make the NFT is valid.

[kenspirit]

ar_link 是tokenURI

owner approve 后，再实际执行_mint，发行 NFT。

把 transfer方法也改一下，就是namecard 不能 transfer 给别人，只能 burn 到 0x0 地址

用这个ar_link 拼接处一个符合 OpenSea 规范的 JSON，存成 tokenURI

https://github.com/qiwihui/scaffold-eth/blob/loogies-svg-nft/packages/hardhat/contracts/YourCollectible.sol

string(
              abi.encodePacked(
                'data:application/json;base64,',
                Base64.encode(
                    bytes(
                          abi.encodePacked(
                              '{"name":"',
                              name,
                              '", "description":"',
                              description,
                              '", "external_url":"https://burnyboys.com/token/',
                              id.toString(),
                              '", "attributes": [{"trait_type": "color", "value": "#',
                              color[id].toColor(),
                              '"},{"trait_type": "chubbiness", "value": ',
                              uint2str(chubbiness[id]),
                              '}], "owner":"',
                              (uint160(ownerOf(id))).toHexString(20),
                              '", "image": "',
                              'data:image/svg+xml;base64,',
                              image,
                              '"}'
                          )
                        )
                    )
              )
          );