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Outline

•    - function _msgSender()
•    - function _msgData()
• interface IERC20
•    - function totalSupply()
•    - function balanceOf(address account)
•    - function transfer(address recipient, ...
•    - function allowance(address owner, add ...
•    - function approve(address spender, uin ...
•    - function transferFrom(address sender, ...
•    - function owner()
•    - function renounceOwnership()
•    - function transferOwnership(address ne ...
•  contract BrightID is Ownable *
•    - function sponsor(address addr)
•    - function setApp(bytes32 _app)
•    - function setVerifierToken(IERC20 _ver ...
•    - function verify(
•    - function isVerified(address addr)

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/**
 *Submitted for verification at gnosisscan.io on 2022-08-04
*/

// SPDX-License-Identifier: MIT
// Verfification Token Contract: 0xBC51B8713F2f6F97cE20A8983448382544Db78e3
pragma solidity ^0.8.0;


abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}


interface IERC20 {
    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `sender` to `recipient` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(address sender, address recipient, uint256 amount) external returns (bool);

    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);
}

abstract contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor () {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

//-------------------Contracts-------------------------------
contract BrightID is Ownable {
    
    //-------------------Storage-----------------------------    
    IERC20 public verifierToken; // address of verification Token  
    bytes32 public app; //Regiested BrightID app name 
    
    struct Verification {
        uint256 time;
        bool isVerified;
    }

    //-------------------Events-----------------------------
    event Verified(address indexed addr);
    event VerifierTokenSet(IERC20 verifierToken);
    event AppSet(bytes32 _app);
    event Sponsor(address indexed addr);

    
    //-------------------Mappings---------------------------
    mapping(address => Verification) public verifications;
    mapping(address => address) public history;
    
    //-------------------Contructor-------------------------
    /**
     * @param _verifierToken verifier token
     * @param _app BrightID app used for verifying users
     */
    constructor(IERC20 _verifierToken, bytes32 _app) {
        verifierToken = _verifierToken;
        app = _app; 
    }
    

    // emits a sponsor event for brightID nodes // TODO Qeustion, is this correct? 
    function sponsor(address addr) public {
        emit Sponsor(addr);
    }

    /**
     * @notice Set the app
     * @param _app BrightID app used for verifying users
     */
    function setApp(bytes32 _app) public onlyOwner {
        app = _app;
        emit AppSet(_app);
    }

    /**
     * @notice Set verifier token
     * @param _verifierToken verifier token
     */
    function setVerifierToken(IERC20 _verifierToken) public onlyOwner {
        verifierToken = _verifierToken;
        emit VerifierTokenSet(_verifierToken);
    }

    /**
     * @notice Register a user by BrightID verification
     * @param addrs The history of addresses used by this user in the app
     * @param timestamp The BrightID node's verification timestamp
     * @param v Component of signature
     * @param r Component of signature
     * @param s Component of signature
     */
    function verify(
        address[] memory addrs,
        uint timestamp,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public {
        require(verifications[addrs[0]].time < timestamp, "newer verification registered before");

        bytes32 message = keccak256(abi.encodePacked(app, addrs, timestamp));
        address signer = ecrecover(message, v, r, s);
        require(verifierToken.balanceOf(signer) > 0, "not authorized");

        verifications[addrs[0]].time = timestamp;
        verifications[addrs[0]].isVerified = true;
        for(uint i = 1; i < addrs.length; i++) {
            verifications[addrs[i]].time = timestamp;
            verifications[addrs[i]].isVerified = false;
            history[addrs[i - 1]] = addrs[i];
        }
        emit Verified(addrs[0]);
    }

    /**
     * @notice Check an address is verified or not
     * @param addr The context id used for verifying users
     */
    function isVerified(address addr) external view returns (bool) {
        return verifications[addr].isVerified;
    }
}

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[{"inputs":[{"internalType":"contract IERC20","name":"_verifierToken","type":"address"},{"internalType":"bytes32","name":"_app","type":"bytes32"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"_app","type":"bytes32"}],"name":"AppSet","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"}],"name":"Sponsor","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"addr","type":"address"}],"name":"Verified","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"contract IERC20","name":"verifierToken","type":"address"}],"name":"VerifierTokenSet","type":"event"},{"inputs":[],"name":"app","outputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"history","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"isVerified","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"renounceOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_app","type":"bytes32"}],"name":"setApp","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"contract IERC20","name":"_verifierToken","type":"address"}],"name":"setVerifierToken","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"addr","type":"address"}],"name":"sponsor","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"verifications","outputs":[{"internalType":"uint256","name":"time","type":"uint256"},{"internalType":"bool","name":"isVerified","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"verifierToken","outputs":[{"internalType":"contract IERC20","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"addrs","type":"address[]"},{"internalType":"uint256","name":"timestamp","type":"uint256"},{"internalType":"uint8","name":"v","type":"uint8"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"s","type":"bytes32"}],"name":"verify","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000bc51b8713f2f6f97ce20a8983448382544db78e372617265636f696e000000000000000000000000000000000000000000000000

-----Decoded View---------------
Arg [0] : _verifierToken (address): 0xBC51B8713F2f6F97cE20A8983448382544Db78e3
Arg [1] : _app (bytes32): 0x72617265636f696e000000000000000000000000000000000000000000000000

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000bc51b8713f2f6f97ce20a8983448382544db78e3
Arg [1] : 72617265636f696e000000000000000000000000000000000000000000000000