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/**
 *Submitted for verification at Etherscan.io on 2025-05-12
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract MasterAccessRegistry {
    mapping(bytes32 => bool) private accessList;
    address public owner;

    event AccessGranted(bytes32 indexed credentialHash);
    event AccessRevoked(bytes32 indexed credentialHash);

    modifier onlyOwner() {
        require(msg.sender == owner, "Not authorized");
        _;
    }

    constructor() {
        owner = msg.sender;
    }

    function grantAccess(bytes32 credentialHash) external onlyOwner {
        accessList[credentialHash] = true;
        emit AccessGranted(credentialHash);
    }

    function revokeAccess(bytes32 credentialHash) external onlyOwner {
        accessList[credentialHash] = false;
        emit AccessRevoked(credentialHash);
    }

    function hasAccess(bytes32 credentialHash) external view returns (bool) {
        return accessList[credentialHash];
    }
}

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[{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"credentialHash","type":"bytes32"}],"name":"AccessGranted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"credentialHash","type":"bytes32"}],"name":"AccessRevoked","type":"event"},{"inputs":[{"internalType":"bytes32","name":"credentialHash","type":"bytes32"}],"name":"grantAccess","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"credentialHash","type":"bytes32"}],"name":"hasAccess","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"credentialHash","type":"bytes32"}],"name":"revokeAccess","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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ipfs://af07de3fe4f0ef3328b0cb6431ff8063829c80f8d45446f01a659dddc013b6d0