Contract 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff 3

Contract Overview

Balance:
0 HT

Token:
Txn Hash Method
Block
From
To
Value [Txn Fee]
0xa6b526914d3782cb902dfa9762f657f23ab372ece18a17b7984e4ab2553d0e65Synthesize With ...120866552022-01-25 22:44:5846 mins ago0xe0fc299676a2330f484bd680f517d8570df3bcf9 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0x58641a697fa466da44a756b3b2821a737ac0b3bc027ae75e35eec254a52b4518Synthesize With ...120865892022-01-25 22:41:4049 mins ago0xaf87b15dd613cbccca0bd568d3e75db08885688a IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224224 1
0xfaa18d1ca46cb85a20c9154ded8591e5f9b389a32c42764718bf59f63f7e9c2aSynthesize With ...120865282022-01-25 22:38:3752 mins ago0xe1fe551771531916658c2a20125e97b38569f992 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0xa7eb59879504b77a800431aac26f96b2f299dd7daf851b40da2724efa8ca4c1aSynthesize With ...120863442022-01-25 22:29:251 hr 1 min ago0xd73c3bf875396ecd41d920b10e2a34a9da8addca IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0x50b1135ee05955c462a3abe2855fdbc3cf4a38dc24843d84768940d6e288d6c4Synthesize With ...120862572022-01-25 22:25:041 hr 6 mins ago0x21b7e211de8712544d5f7c8601df844859ce5b82 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xf867bde980fac572a4c628e92ea6a6ee13f8aa5b8650a5647eef16997941f39fSynthesize With ...120861402022-01-25 22:19:131 hr 11 mins ago0xb6e524b268badbe73f5c3b72e064fc9808515994 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xe009cf310aec87da579fe6b361fd0754a93c6d3dd7860374c5138b8d2913929dSynthesize With ...120855312022-01-25 21:48:461 hr 42 mins ago0xe9908c9a85478816ee83d5aad22b4f96075063e3 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224224 1
0x6c9eca2a82606f04e4001af067a59ff2fca50f085e65e4352a11c886f7f4494aSynthesize With ...120854312022-01-25 21:43:461 hr 47 mins ago0xa8a4a0a74937c4b90f5bf59c9caab7bf9d7e1747 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xe85ad0310d3fcbf76a4bf3edd1a447450c2f4cf18521f2cf4f03da77a4053058Synthesize With ...120849622022-01-25 21:20:192 hrs 10 mins ago0xd1762b9fad871fa7c17469e1040e919d00ad293c IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224229 1
0xef8f352cea7dd0b810f1f5e9041e6a5393a44747096e6416f599f2806bbe4ec8Synthesize With ...120848402022-01-25 21:14:132 hrs 16 mins ago0xe02960fb34724ed1354afbb806ab2e07c20cdca3 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0x22fb263f7463bc53e807cb9da627f1651241e45df44b3c0fcc94d22f7c744c48Synthesize With ...120845242022-01-25 20:58:252 hrs 32 mins ago0x338ffa6edab01f5412ec71dc28fc0e7f7ec6af84 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xc384b239681daf03dabf14363ea69638d4a0c9808aeab83c5d8f81a3d2a62253Synthesize With ...120837772022-01-25 20:21:043 hrs 10 mins ago0xe3eae882dde5237f472da3700d223c90eb8acd30 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0xb9007d68fa735581cb0cf95faee230cf363dba7e83443b40fe06fd1f9d94f0f1Synthesize With ...120836742022-01-25 20:15:553 hrs 15 mins ago0x46495f290f78183c262afb72d94225d1e8ba3b4f IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224241 1
0x1b82fde66d27d62607c5e54480b0e6d9c82ffde34121ff44705d550222ca18c4Synthesize With ...120834072022-01-25 20:02:343 hrs 28 mins ago0x6ec6d99391ad1eea93c439353ad3ebca50cac32c IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xeab0e65ebc6beb0ea8da35f0198fe49f0e9286232f0558740cc6ac03d72ee7f6Synthesize With ...120831312022-01-25 19:48:463 hrs 42 mins ago0x1496df4ad29dff8bcf2c612b86aee92a9116d945 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xb6645703aea0fc79f168336d00352c7bf2ec83b5edeec3c09e3e70bc24f47114Synthesize With ...120831032022-01-25 19:47:223 hrs 43 mins ago0x072cc8a4eb10dad2ef9bffaf10795633f0db69fb IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0x876042ca3176ee146aabe9de338af3217712d758e2dac3cf0c77ac1dae440b08Synthesize With ...120823432022-01-25 19:09:224 hrs 21 mins ago0x926a109981cabe0f878780e671dd99d775807268 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224224 1
0xf75f6f4efef77f0c4a252537e56c16e27e861d7df3bf8598478df409c346e44dSynthesize With ...120823222022-01-25 19:08:194 hrs 22 mins ago0x0b1b12f0b9d993de4f0be004e829f53d0e43e497 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0x6f66cfbd18e1e778966ec95e56035508fafc0db8d0d9579fd8cb136e7e619418Synthesize With ...120822412022-01-25 19:04:164 hrs 26 mins ago0x7c07bf6f37bc5c00b8faf33d57e784527d0508ae IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224229 1
0x1c3ae3d40c2237ecb5737cd06b5519785a65a43014bf5f2e1cfcc564ff04048fSynthesize With ...120817672022-01-25 18:40:344 hrs 50 mins ago0xe7e69cc44582b28a54c7c4f61e4091efd549bf60 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0x00c935a287203f950298ad216f2f1b4008de34d4f7e92ee31e5174f657b48b0dSynthesize With ...120809242022-01-25 17:58:255 hrs 32 mins ago0x52594284f19350b7f8fc1b85cc39292802483ff9 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224212 1
0xe5c1f3017a550241b82907f76c79ac1b8f01c9a61c49c65d702045e905be6017Synthesize With ...120807892022-01-25 17:51:405 hrs 39 mins ago0x71c768fc5372e42282129e20b33eed670ae82a24 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0xfc5ff155569fc9ae446a573c3144a7b218a4837ef2b98c7c3a09f1501417c5c7Synthesize With ...120807792022-01-25 17:51:105 hrs 40 mins ago0x2521fc0c6f0b4b9265686014a06b6fc41f09ec67 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224253 1
0x0219041e98b2b37df7094762c23cf5217057bd5dd0b02570b38c92b6bbc4b7d4Synthesize With ...120806652022-01-25 17:45:285 hrs 45 mins ago0x6a14ece39640d4a06ff8de912ad4233cf3ec1d89 IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.000224236 1
0x1fd352de4847229a63bab99f3f23376f4f960f44c8e0748f5b6d52267dc8dd5fSynthesize120804272022-01-25 17:33:345 hrs 57 mins ago0x5e7d53cdbe59714956b835774e347fd6508100ba IN 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0 HT0.0001741231
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Latest 25 internal transaction
Parent Txn Hash Block From To Value
0xa6b526914d3782cb902dfa9762f657f23ab372ece18a17b7984e4ab2553d0e65120866552022-01-25 22:44:5846 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0xa6b526914d3782cb902dfa9762f657f23ab372ece18a17b7984e4ab2553d0e65120866552022-01-25 22:44:5846 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xa6b526914d3782cb902dfa9762f657f23ab372ece18a17b7984e4ab2553d0e65120866552022-01-25 22:44:5846 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x58641a697fa466da44a756b3b2821a737ac0b3bc027ae75e35eec254a52b4518120865892022-01-25 22:41:4049 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0x58641a697fa466da44a756b3b2821a737ac0b3bc027ae75e35eec254a52b4518120865892022-01-25 22:41:4049 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x58641a697fa466da44a756b3b2821a737ac0b3bc027ae75e35eec254a52b4518120865892022-01-25 22:41:4049 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xfaa18d1ca46cb85a20c9154ded8591e5f9b389a32c42764718bf59f63f7e9c2a120865282022-01-25 22:38:3752 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0xfaa18d1ca46cb85a20c9154ded8591e5f9b389a32c42764718bf59f63f7e9c2a120865282022-01-25 22:38:3752 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xfaa18d1ca46cb85a20c9154ded8591e5f9b389a32c42764718bf59f63f7e9c2a120865282022-01-25 22:38:3752 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xa7eb59879504b77a800431aac26f96b2f299dd7daf851b40da2724efa8ca4c1a120863442022-01-25 22:29:251 hr 1 min ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0xa7eb59879504b77a800431aac26f96b2f299dd7daf851b40da2724efa8ca4c1a120863442022-01-25 22:29:251 hr 1 min ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xa7eb59879504b77a800431aac26f96b2f299dd7daf851b40da2724efa8ca4c1a120863442022-01-25 22:29:251 hr 1 min ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x50b1135ee05955c462a3abe2855fdbc3cf4a38dc24843d84768940d6e288d6c4120862572022-01-25 22:25:041 hr 6 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0x50b1135ee05955c462a3abe2855fdbc3cf4a38dc24843d84768940d6e288d6c4120862572022-01-25 22:25:041 hr 6 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x50b1135ee05955c462a3abe2855fdbc3cf4a38dc24843d84768940d6e288d6c4120862572022-01-25 22:25:041 hr 6 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xf867bde980fac572a4c628e92ea6a6ee13f8aa5b8650a5647eef16997941f39f120861402022-01-25 22:19:131 hr 11 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0xf867bde980fac572a4c628e92ea6a6ee13f8aa5b8650a5647eef16997941f39f120861402022-01-25 22:19:131 hr 11 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xf867bde980fac572a4c628e92ea6a6ee13f8aa5b8650a5647eef16997941f39f120861402022-01-25 22:19:131 hr 11 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xe009cf310aec87da579fe6b361fd0754a93c6d3dd7860374c5138b8d2913929d120855312022-01-25 21:48:461 hr 42 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0xe009cf310aec87da579fe6b361fd0754a93c6d3dd7860374c5138b8d2913929d120855312022-01-25 21:48:461 hr 42 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xe009cf310aec87da579fe6b361fd0754a93c6d3dd7860374c5138b8d2913929d120855312022-01-25 21:48:461 hr 42 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x6c9eca2a82606f04e4001af067a59ff2fca50f085e65e4352a11c886f7f4494a120854312022-01-25 21:43:461 hr 47 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
0x6c9eca2a82606f04e4001af067a59ff2fca50f085e65e4352a11c886f7f4494a120854312022-01-25 21:43:461 hr 47 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0x6c9eca2a82606f04e4001af067a59ff2fca50f085e65e4352a11c886f7f4494a120854312022-01-25 21:43:461 hr 47 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x8781f0fe84cc9aa55f3e0f622001f816cca61cc90 HT
0xe85ad0310d3fcbf76a4bf3edd1a447450c2f4cf18521f2cf4f03da77a4053058120849622022-01-25 21:20:192 hrs 10 mins ago 0xd1b2536eab9c1b20d088ed9cc02fd67ae7b324ff0x87c06a8857c121c8096ba588865b344ae0c3703f0 HT
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Contract Source Code Verified (Exact Match)

Contract Name:
Portal

Compiler Version
v0.8.0+commit.c7dfd78e

Optimization Enabled:
Yes with 200 runs

Other Settings:
default evmVersion, MIT license

Contract Source Code (Solidity)

/**
 *Submitted for verification at hecoinfo.com on 2021-12-25
*/

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IBridge {
     function transmitRequestV2(bytes memory owner, address receiveSide, address oppositeBridge, uint chainID) external returns (bytes32);
}



// helper methods for interacting with ERC20 tokens and sending ETH that do not consistently return true/false
library TransferHelper {
    function safeApprove(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('approve(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x095ea7b3, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeApprove: approve failed'
        );
    }

    function safeTransfer(
        address token,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transfer(address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0xa9059cbb, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::safeTransfer: transfer failed'
        );
    }

    function safeTransferFrom(
        address token,
        address from,
        address to,
        uint256 value
    ) internal {
        // bytes4(keccak256(bytes('transferFrom(address,address,uint256)')));
        (bool success, bytes memory data) = token.call(abi.encodeWithSelector(0x23b872dd, from, to, value));
        require(
            success && (data.length == 0 || abi.decode(data, (bool))),
            'TransferHelper::transferFrom: transferFrom failed'
        );
    }

    function safeTransferETH(address to, uint256 value) internal {
        (bool success, ) = to.call{value: value}(new bytes(0));
        require(success, 'TransferHelper::safeTransferETH: ETH transfer failed');
    }
}











/*
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
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;
    }
}

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
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;
    }
}





// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is no longer needed starting with Solidity 0.8. The compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the substraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b, string memory errorMessage) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}









abstract contract RelayRecipient is Context, Ownable {
   
    /*
     * Forwarder singleton we accept calls from
     */
    address private _trustedForwarder;

    function trustedForwarder() public virtual view returns (address){
        return _trustedForwarder;
    }

    function _setTrustedForwarder(address _forwarder) internal {
        _trustedForwarder = _forwarder;
    }

    function isTrustedForwarder(address forwarder) public virtual view returns(bool) {
        return forwarder == _trustedForwarder;
    }

    /**
     * return the sender of this call.
     * if the call came through our trusted forwarder, return the original sender.
     * otherwise, return `msg.sender`.
     * should be used in the contract anywhere instead of msg.sender
     */
    function _msgSender() internal override virtual view returns (address ret) {
        if (msg.data.length >= 20 && isTrustedForwarder(msg.sender)) {
            // At this point we know that the sender is a trusted forwarder,
            // so we trust that the last bytes of msg.data are the verified sender address.
            // extract sender address from the end of msg.data
            assembly {
                ret := shr(96,calldataload(sub(calldatasize(),20)))
            }
        } else {
            ret = msg.sender;
        }
    }

    /**
     * return the msg.data of this call.
     * if the call came through our trusted forwarder, then the real sender was appended as the last 20 bytes
     * of the msg.data - so this method will strip those 20 bytes off.
     * otherwise (if the call was made directly and not through the forwarder), return `msg.data`
     * should be used in the contract instead of msg.data, where this difference matters.
     */
    function _msgData() internal override virtual view returns (bytes calldata ret) {
        if (msg.data.length >= 20 && isTrustedForwarder(msg.sender)) {
            return msg.data[0:msg.data.length-20];
        } else {
            return msg.data;
        }
    }

}



contract Portal is RelayRecipient {
    using SafeMath for uint256;

    mapping(address => uint) public balanceOf;
    address public bridge;
    string public versionRecipient = "2.2.3";

    enum RequestState { Default, Sent, Reverted }
    enum UnsynthesizeState { Default, Unsynthesized, RevertRequest }

    struct TxState {
        address recipient;
        address chain2address;
        uint256 amount;
        address rtoken;
        RequestState state;
    }

    uint256 requestCount = 1;
    mapping (bytes32 => TxState) public requests;
    mapping (bytes32 => UnsynthesizeState) public unsynthesizeStates;

    event SynthesizeRequest(bytes32 indexed _id, address indexed _from, address indexed _to, uint _amount, address _token);
    event RevertBurnRequest(bytes32 indexed _id, address indexed _to);
    event BurnCompleted(bytes32 indexed _id, address indexed _to, uint _amount, address _token);
    event RevertSynthesizeCompleted(bytes32 indexed _id, address indexed _to, uint _amount, address _token);

    constructor(address _bridge, address _trustedForwarder){
        bridge = _bridge;
        _setTrustedForwarder(_trustedForwarder);
    }

    modifier onlyBridge {
        require(bridge == msg.sender);
        _;
    }

    function setTrustedForwarder(address _forwarder) external onlyOwner {
       return _setTrustedForwarder(_forwarder);
    }


    // Token -> sToken on a second chain
    function synthesize(
        address _token,
        uint256 _amount,
        address _chain2address,
        address _receiveSide,
        address _oppositeBridge,
        uint _chainID
    ) external returns (bytes32 txID) {
        TransferHelper.safeTransferFrom(_token, _msgSender(), address(this), _amount);
        balanceOf[_token] = balanceOf[_token].add(_amount);

        txID = keccak256(abi.encodePacked(this, requestCount));

        bytes memory out  = abi.encodeWithSelector(bytes4(keccak256(bytes('mintSyntheticToken(bytes32,address,uint256,address)'))), txID, _token, _amount, _chain2address);
        // TODO add payment by token
        IBridge(bridge).transmitRequestV2(out,_receiveSide, _oppositeBridge, _chainID);
        TxState storage txState = requests[txID];
        txState.recipient    = _msgSender();
        txState.chain2address    = _chain2address;
        txState.rtoken     = _token;
        txState.amount     = _amount;
        txState.state = RequestState.Sent;

        requestCount +=1;

        emit SynthesizeRequest(txID, _msgSender(), _chain2address, _amount, _token);
    }

    // Token -> sToken on a second chain withPermit
    function synthesizeWithPermit(
        bytes calldata _approvalData,
        address _token,
        uint256 _amount,
        address _chain2address,
        address _receiveSide,
        address _oppositeBridge,
        uint _chainID
    )  external returns (bytes32 txID) {

        (bool _success1, ) = _token.call(_approvalData);
        require(_success1, "Approve call failed");

        TransferHelper.safeTransferFrom(_token, _msgSender(), address(this), _amount);
        balanceOf[_token] = balanceOf[_token].add(_amount);

        txID = keccak256(abi.encodePacked(this, requestCount));

        bytes memory out  = abi.encodeWithSelector(bytes4(keccak256(bytes('mintSyntheticToken(bytes32,address,uint256,address)'))), txID, _token, _amount, _chain2address);
        // TODO add payment by token
        IBridge(bridge).transmitRequestV2(out,_receiveSide, _oppositeBridge, _chainID);
        TxState storage txState = requests[txID];
        txState.recipient    = _msgSender();
        txState.chain2address    = _chain2address;
        txState.rtoken     = _token;
        txState.amount     = _amount;
        txState.state = RequestState.Sent;

        requestCount +=1;

        emit SynthesizeRequest(txID, _msgSender(), _chain2address, _amount, _token);
    }

    // can called only by bridge after initiation on a second chain
    function emergencyUnsynthesize(bytes32 _txID) external onlyBridge {
        TxState storage txState = requests[_txID];
        require(txState.state == RequestState.Sent , 'Portal:state not open or tx does not exist');

        txState.state = RequestState.Reverted; // close
        TransferHelper.safeTransfer(txState.rtoken, txState.recipient, txState.amount);

        emit RevertSynthesizeCompleted(_txID, txState.recipient, txState.amount, txState.rtoken);
    }

    // can called only by bridge after initiation on a second chain
    function unsynthesize(bytes32 _txID, address _token, uint256 _amount, address _to) external onlyBridge {
        require(unsynthesizeStates[_txID] == UnsynthesizeState.Default, "Portal: syntatic tokens emergencyUnburn");

        TransferHelper.safeTransfer(_token, _to, _amount);
        balanceOf[_token] = balanceOf[_token].sub(_amount);

        unsynthesizeStates[_txID] = UnsynthesizeState.Unsynthesized;

        emit BurnCompleted(_txID, _to, _amount, _token);
    }

    // Revert burnSyntheticToken() operation, can be called several times
    function emergencyUnburnRequest(bytes32 _txID, address _receiveSide, address _oppositeBridge, uint _chainId) external {
        require(unsynthesizeStates[_txID] != UnsynthesizeState.Unsynthesized, "Portal: Real tokens already transfered");
        unsynthesizeStates[_txID] = UnsynthesizeState.RevertRequest;

        bytes memory out  = abi.encodeWithSelector(bytes4(keccak256(bytes('emergencyUnburn(bytes32)'))),_txID);
        // TODO add payment by token
        IBridge(bridge).transmitRequestV2(out, _receiveSide, _oppositeBridge, _chainId);

        emit RevertBurnRequest(_txID, _msgSender());
    }

    // should be restricted in mainnets
    function changeBridge(address _bridge) external onlyOwner {
        bridge = _bridge;
    }

}

Contract Security Audit

Contract ABI

[{"inputs":[{"internalType":"address","name":"_bridge","type":"address"},{"internalType":"address","name":"_trustedForwarder","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"_id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"BurnCompleted","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":"bytes32","name":"_id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"_to","type":"address"}],"name":"RevertBurnRequest","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"_id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"RevertSynthesizeCompleted","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"bytes32","name":"_id","type":"bytes32"},{"indexed":true,"internalType":"address","name":"_from","type":"address"},{"indexed":true,"internalType":"address","name":"_to","type":"address"},{"indexed":false,"internalType":"uint256","name":"_amount","type":"uint256"},{"indexed":false,"internalType":"address","name":"_token","type":"address"}],"name":"SynthesizeRequest","type":"event"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"bridge","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_bridge","type":"address"}],"name":"changeBridge","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_txID","type":"bytes32"},{"internalType":"address","name":"_receiveSide","type":"address"},{"internalType":"address","name":"_oppositeBridge","type":"address"},{"internalType":"uint256","name":"_chainId","type":"uint256"}],"name":"emergencyUnburnRequest","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_txID","type":"bytes32"}],"name":"emergencyUnsynthesize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"forwarder","type":"address"}],"name":"isTrustedForwarder","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":"","type":"bytes32"}],"name":"requests","outputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"address","name":"chain2address","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"address","name":"rtoken","type":"address"},{"internalType":"enum Portal.RequestState","name":"state","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_forwarder","type":"address"}],"name":"setTrustedForwarder","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_chain2address","type":"address"},{"internalType":"address","name":"_receiveSide","type":"address"},{"internalType":"address","name":"_oppositeBridge","type":"address"},{"internalType":"uint256","name":"_chainID","type":"uint256"}],"name":"synthesize","outputs":[{"internalType":"bytes32","name":"txID","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes","name":"_approvalData","type":"bytes"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_chain2address","type":"address"},{"internalType":"address","name":"_receiveSide","type":"address"},{"internalType":"address","name":"_oppositeBridge","type":"address"},{"internalType":"uint256","name":"_chainID","type":"uint256"}],"name":"synthesizeWithPermit","outputs":[{"internalType":"bytes32","name":"txID","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"trustedForwarder","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"_txID","type":"bytes32"},{"internalType":"address","name":"_token","type":"address"},{"internalType":"uint256","name":"_amount","type":"uint256"},{"internalType":"address","name":"_to","type":"address"}],"name":"unsynthesize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"unsynthesizeStates","outputs":[{"internalType":"enum Portal.UnsynthesizeState","name":"","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"versionRecipient","outputs":[{"internalType":"string","name":"","type":"string"}],"stateMutability":"view","type":"function"}]

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Constructor Arguments (ABI-Encoded and is the last bytes of the Contract Creation Code above)

00000000000000000000000087c06a8857c121c8096ba588865b344ae0c3703f0000000000000000000000000000000000000000000000000000000000000000
-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 00000000000000000000000087c06a8857c121c8096ba588865b344ae0c3703f
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000000


Deployed ByteCode Sourcemap

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Swarm Source

ipfs://383911be2662174048bb2c8fa0864145672e47da3af5a03f13abb0dbfe3b8278
Block Transaction Gas Used Reward
Age Block Fee Address Jailed Incoming
Block Uncle Number Difficulty Gas Used Reward
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