Contract

0x75982eBc73a9Fc60d4CBbb4be8CF301bfC032976

Source Code

Overview

ETH Balance

0 ETH

More Info

ContractCreator

0x3CbA4CAC...cfd813723 at txn 0xa7ae777357cdc1b591c117452d8313a107ddee5bcd29f5179f2de425c58aeaed

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Similar Match Source Code
This contract matches the deployed Bytecode of the Source Code for Contract 0x33e62296...1c0A22DfA
The constructor portion of the code might be different and could alter the actual behaviour of the contract

Contract Name:

SampleAttestation

Compiler Version

v0.8.26+commit.8a97fa7a

Optimization Enabled:

Yes with 200 runs

Other Settings:

paris EvmVersion

Contract Source Code (Solidity Standard Json-Input format)

IDE

File 1 of 3 : Attestation.sol

// SPDX-License-Identifier: APACHE-2.0
pragma solidity ^0.8.20;

import {Proof} from "./Proof.sol";
import {ProofVerifier} from "./ProofVerifier.sol";

struct Attestation {
    bytes32 uid;
    bytes32 schema;
    bytes32 uHash;
    address recipient;
    bytes32 publicFieldsHash;
}

contract SampleAttestation is ProofVerifier {
    mapping(bytes32 uid => Attestation) private attestations;
    mapping(address => bytes32 uid) private attestedAddresses;

	address public owner;

    string private secret = "bad Secret";

    constructor(string memory _newSecret) ProofVerifier() {
		owner = msg.sender;
		secret = _newSecret;
	}

    function attest(bytes memory _proofAsBytes) public returns (string memory) {
        Proof memory _proof = abi.decode(_proofAsBytes, (Proof));
        require(verify(_proof), "verify proof fail");

        Attestation memory attestation = Attestation({
            uid: 0,
            schema: _proof.schemaId,
            uHash: _proof.uHash,
            recipient: _proof.recipient,
            publicFieldsHash: _proof.publicFieldsHash
        });

        bytes32 uid;
        uint32 bump = 0;
        while (true) {
            uid = getUID(attestation, bump);
            if (attestations[uid].uid == 0) {
                break;
            }

            unchecked {
                ++bump;
            }
        }

        attestation.uid = uid;

        attestations[uid] = attestation;
        attestedAddresses[_proof.recipient] = uid;
        return secret;
    }

    function getAttestationFromAddress(address _recipient) public view returns (Attestation memory) {
        return attestations[attestedAddresses[_recipient]];
    }

    function getAttestation(bytes32 uid) public view returns (Attestation memory) {
        return attestations[uid];
    }

    function getUID(Attestation memory attestation, uint32 bump) private pure returns (bytes32) {
        return keccak256(
            abi.encodePacked(
                attestation.schema, attestation.uHash, attestation.recipient, attestation.publicFieldsHash, bump
            )
        );
    }
}

File 2 of 3 : Proof.sol

// SPDX-License-Identifier: APACHE-2.0
pragma solidity ^0.8.20;

struct Proof {
    bytes32 taskId;
    bytes32 schemaId;
    bytes32 uHash;
    address recipient;
    bytes32 publicFieldsHash;
    address validator;
    bytes allocatorSignature;
    bytes validatorSignature;
}

File 3 of 3 : ProofVerifier.sol

// SPDX-License-Identifier: APACHE-2.0
pragma solidity ^0.8.20;

import {Proof} from "./Proof.sol";

contract ProofVerifier {
    address public defaultAllocator = 0x19a567b3b212a5b35bA0E3B600FbEd5c2eE9083d;

    constructor() {}

    function verify(Proof memory _proof) public view returns (bool) {
        return (
            verifyAllocatorSignature(_proof.taskId, _proof.schemaId, _proof.validator, _proof.allocatorSignature)
                && verifyValidatorSignature(
                    _proof.taskId,
                    _proof.schemaId,
                    _proof.uHash,
                    _proof.recipient,
                    _proof.publicFieldsHash,
                    _proof.validator,
                    _proof.validatorSignature
                )
        );
    }

    function verifyAllocatorSignature(
        bytes32 _taskId,
        bytes32 _schemaId,
        address _validator,
        bytes memory _allocatorSignature
    ) public view returns (bool) {
        bytes32 hashed = keccak256(abi.encode(_taskId, _schemaId, _validator));
        address allocator = recoverSigner(prefixed(hashed), _allocatorSignature);

        return (allocator == defaultAllocator);
    }

    function verifyValidatorSignature(
        bytes32 _taskId,
        bytes32 _schemaId,
        bytes32 _uHash,
        address _recipient,
        bytes32 _publicFieldsHash,
        address _validator,
        bytes memory _validatorSignature
    ) public pure returns (bool) {
        bytes32 hashed = keccak256(abi.encode(_taskId, _schemaId, _uHash, _publicFieldsHash, _recipient));
        address validator = recoverSigner(prefixed(hashed), _validatorSignature);

        return (validator == _validator);
    }

    function prefixed(bytes32 hash) private pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    function recoverSigner(bytes32 _hash, bytes memory _signature) private pure returns (address signer) {
        require(_signature.length == 65, "Invalid signature length");
        bytes32 r;
        bytes32 s;
        uint8 v;
        assembly {
            r := mload(add(_signature, 0x20))
            s := mload(add(_signature, 0x40))
            v := byte(0, mload(add(_signature, 0x60)))
        }
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            revert("SignatureValidator#recoverSigner: invalid signature 's' value");
        }

        if (v != 27 && v != 28) {
            revert("SignatureValidator#recoverSigner: invalid signature 'v' value");
        }

        signer = ecrecover(_hash, v, r, s);
        // Prevent signer from being 0x0
        require(signer != address(0x0), "SignatureValidator#recoverSigner: INVALID_SIGNER");
        return signer;
    }
}

Settings

{
  "remappings": [
    "forge-std/=lib/forge-std/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

Contract ABI

API

[{"inputs":[{"internalType":"string","name":"_newSecret","type":"string"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[{"internalType":"bytes","name":"_proofAsBytes","type":"bytes"}],"name":"attest","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"defaultAllocator","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"uid","type":"bytes32"}],"name":"getAttestation","outputs":[{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"bytes32","name":"schema","type":"bytes32"},{"internalType":"bytes32","name":"uHash","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bytes32","name":"publicFieldsHash","type":"bytes32"}],"internalType":"struct Attestation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_recipient","type":"address"}],"name":"getAttestationFromAddress","outputs":[{"components":[{"internalType":"bytes32","name":"uid","type":"bytes32"},{"internalType":"bytes32","name":"schema","type":"bytes32"},{"internalType":"bytes32","name":"uHash","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bytes32","name":"publicFieldsHash","type":"bytes32"}],"internalType":"struct Attestation","name":"","type":"tuple"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"bytes32","name":"taskId","type":"bytes32"},{"internalType":"bytes32","name":"schemaId","type":"bytes32"},{"internalType":"bytes32","name":"uHash","type":"bytes32"},{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bytes32","name":"publicFieldsHash","type":"bytes32"},{"internalType":"address","name":"validator","type":"address"},{"internalType":"bytes","name":"allocatorSignature","type":"bytes"},{"internalType":"bytes","name":"validatorSignature","type":"bytes"}],"internalType":"struct Proof","name":"_proof","type":"tuple"}],"name":"verify","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_taskId","type":"bytes32"},{"internalType":"bytes32","name":"_schemaId","type":"bytes32"},{"internalType":"address","name":"_validator","type":"address"},{"internalType":"bytes","name":"_allocatorSignature","type":"bytes"}],"name":"verifyAllocatorSignature","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_taskId","type":"bytes32"},{"internalType":"bytes32","name":"_schemaId","type":"bytes32"},{"internalType":"bytes32","name":"_uHash","type":"bytes32"},{"internalType":"address","name":"_recipient","type":"address"},{"internalType":"bytes32","name":"_publicFieldsHash","type":"bytes32"},{"internalType":"address","name":"_validator","type":"address"},{"internalType":"bytes","name":"_validatorSignature","type":"bytes"}],"name":"verifyValidatorSignature","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"pure","type":"function"}]

Deployed Bytecode

Decompile Bytecode

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