动产质押区块链登记系统如何创建

pragma solidity ^0.8.0;

contract PledgeRegistry {
    struct Pledge {
        address pledger;
        uint256 amount;
        string assetDescription;
        bool isActive;
    }

    mapping(uint256 => Pledge) public pledges;
    uint256 public pledgeCount;

    event PledgeAdded(uint256 indexed id, address pledger, uint256 amount, string assetDescription);

    function addPledge(uint256 _amount, string memory _assetDescription) public {
        pledgeCount++;
        pledges[pledgeCount] = Pledge(msg.sender, _amount, _assetDescription, true);
        emit PledgeAdded(pledgeCount, msg.sender, _amount, _assetDescription);
    }

    function deactivatePledge(uint256 _id) public {
        require(pledges[_id].pledger == msg.sender, "Only the pledger can deactivate the pledge.");
        pledges[_id].isActive = false;
    }
}