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Hypercerts 是一個用於建立可擴展的回顧性獎勵系統工具以產生正向影響。

合約架構

interface 介面

IHypercertToken
This interface is the requirements set for hypercert-compliant tokens. This enables developer to use their own preferred token implementation or standard.

主要合約

HypercertMinter
Example implementation for a hypercert token that is an ERC1155 NFT under the hood with an Allowlist extension.

初看以上兩合約

IHypercertToken

重要的enum去限制轉手行為

 enum TransferRestrictions {
        AllowAll,
        DisallowAll,
        FromCreatorOnly
    }

及不同的mint方式

HypercertMinter

包含IHypercertToken、SemiFungible1155、AllowlistMinter、PausableUpgradeable
重要的檢查為這個

 function _beforeTokenTransfer(
        address operator,
        address from,
        address to,
        uint256[] memory ids,
        uint256[] memory amounts,
        bytes memory data
    ) internal virtual override {
        super._beforeTokenTransfer(operator, from, to, ids, amounts, data);

        // By-pass transfer restrictions for minting and burning
        if (from == address(0)) {
            // Minting
            return;
        } else if (to == address(0)) {
            // Burning
            return;
        }

        // Transfer case, where to and from are non-zero
        uint256 len = ids.length;
        for (uint256 i; i < len; ) {
            uint256 typeID = getBaseType(ids[i]);
            TransferRestrictions policy = typeRestrictions[typeID];
            if (policy == TransferRestrictions.DisallowAll) {
                revert Errors.TransfersNotAllowed();
            } else if (policy == TransferRestrictions.FromCreatorOnly && from != creators[typeID]) {
                revert Errors.TransfersNotAllowed();
            }
            unchecked {
                ++i;
            }
        }
    }

期許

• 希望這次可以練習看看Testing怎麼寫 Day24
• 找到Hypercert Audit record，未來希望約Day 25 可以看一下Hypercert 的audit 紀錄。