Contract Source Code (Solidity Standard Json-Input format)

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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.18;

/*
 * Survey Blockchain Anchoring Contract
 * 
 * 기능:
 *  - 설문 응답 해시 anchoring
 *  - 토큰 소모 이벤트 기록
 *  - 응답 무결성 검증을 위한 hash 조회 기능
 *
 * 개인정보 없이 재현 가능한 hash 기반 검증 구조.
 * Arbitrum / Ethereum / Polygon 모두 호환.
 */

contract SurveyAnchor {

    // 설문ID → 응답ID → 해시값
    mapping(uint256 => mapping(uint256 => bytes32)) public responseHashes;

    // --- Events -------------------------------------------------------------

    // 토큰 소모 이벤트
    event ResponseTokenConsumed(
        uint256 indexed surveyId,
        bytes32 indexed tokenHash,
        uint256 blockNumber,
        uint256 timestamp
    );

    // 응답 해시 anchoring 이벤트
    event ResponseAnchored(
        uint256 indexed surveyId,
        uint256 indexed responseId,
        bytes32 responseHash,
        uint256 blockNumber,
        uint256 timestamp
    );

    // --- Token consumption ---------------------------------------------------

    /*
     * 토큰이 소모되었음을 기록
     * tokenHash: 서버에서 SHA256(token 문자열) 결과 (bytes32)
     */
    function consumeToken(uint256 surveyId, bytes32 tokenHash) external {
        emit ResponseTokenConsumed(
            surveyId,
            tokenHash,
            block.number,
            block.timestamp
        );
    }

    // --- Response anchoring --------------------------------------------------

    /*
     * 응답 JSON 정규화 → SHA-256 → bytes32 로 변환된 해시를 저장
     * responseId: 서버 DB의 응답 PK
     */
    function anchorResponse(
        uint256 surveyId,
        uint256 responseId,
        bytes32 responseHash
    ) external {
        responseHashes[surveyId][responseId] = responseHash;

        emit ResponseAnchored(
            surveyId,
            responseId,
            responseHash,
            block.number,
            block.timestamp
        );
    }

    // --- Hash 조회 ----------------------------------------------------------

    function getResponseHash(
        uint256 surveyId,
        uint256 responseId
    ) external view returns (bytes32) {
        return responseHashes[surveyId][responseId];
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  }
}

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[{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"surveyId","type":"uint256"},{"indexed":true,"internalType":"uint256","name":"responseId","type":"uint256"},{"indexed":false,"internalType":"bytes32","name":"responseHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"blockNumber","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"ResponseAnchored","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint256","name":"surveyId","type":"uint256"},{"indexed":true,"internalType":"bytes32","name":"tokenHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"blockNumber","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"timestamp","type":"uint256"}],"name":"ResponseTokenConsumed","type":"event"},{"inputs":[{"internalType":"uint256","name":"surveyId","type":"uint256"},{"internalType":"uint256","name":"responseId","type":"uint256"},{"internalType":"bytes32","name":"responseHash","type":"bytes32"}],"name":"anchorResponse","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"surveyId","type":"uint256"},{"internalType":"bytes32","name":"tokenHash","type":"bytes32"}],"name":"consumeToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"surveyId","type":"uint256"},{"internalType":"uint256","name":"responseId","type":"uint256"}],"name":"getResponseHash","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"responseHashes","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"}]

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