Contract 0x2240Dab907db71e64d3E0dbA4800c83B5C502d4E 2

 
Shut down of 0x Exchange v2.0 contract and migration to patched version. The new ERC20 Proxy contract can be found here.
Txn Hash Method
Block
From
To
Value
0xb340a5660e5f888e45a80d2e0e5e617fe37db614b86595a8caea64ab642e6b16Transfer79954092019-06-20 13:40:19819 days 12 hrs ago0x5c00c07bb2411998962b0fd2e6a0a66235d36b24 IN  0x: Old ERC20 Proxy1.0623 Ether0.00046347422
0x6d368bff897943a4f8df704ad029bc88651d885549f48fb1ffe188c440f4bc90Transfer79949082019-06-20 11:49:29819 days 14 hrs ago0xaa9912d00cdf520af79c03457840ecf89ae643fd IN  0x: Old ERC20 Proxy0.03 Ether0.0004213420
0x79e169ad6bb8b05c92fe8e56bd2343259ecc1acbeb4e4554bc683ebc3f957745Transfer79948972019-06-20 11:47:29819 days 14 hrs ago0xaa9912d00cdf520af79c03457840ecf89ae643fd IN  0x: Old ERC20 Proxy0.001 Ether0.0004213420
0xab497d3d338e3ac83ea51437cd89f089299940d43f2f717ce6a012c4f26caf71-79550612019-06-14 6:03:30825 days 20 hrs ago0xa3a1c4ffd191956dcdb3190aab156b92490187e8 IN  0x: Old ERC20 Proxy0.01 Ether0.0001264266
0x1f4f5f536439c35f1b34076e34a46fdec3c65dca349c667e85a0b084a06dfd9b-79550562019-06-14 6:02:21825 days 20 hrs ago0xa3a1c4ffd191956dcdb3190aab156b92490187e8 IN  0x: Old ERC20 Proxy0.01 Ether0.0002107110
0xf8115421650496b474c65cce49589d07f83d17388f781d6f472b12f9b6db9c3d-79550442019-06-14 5:59:34825 days 20 hrs ago0xa3a1c4ffd191956dcdb3190aab156b92490187e8 IN  0x: Old ERC20 Proxy0.01 Ether0.0001053555
0xfe11c9fd4e62f1503e95544fcb2a93c758ff1ff27bc61b3b1bc1980fcbd9a25cTransfer78998122019-06-05 14:40:59834 days 11 hrs ago0x48ce985cdf58570182b630781cc830e9ab4ff14e IN  0x: Old ERC20 Proxy0.04143189 Ether0.00031600515
0x2e9d951f32a53c8e852695245fe6fb1590704cf5490e94a0783608073a0fae4aTransfer72739072019-02-27 9:41:26932 days 16 hrs ago0x882d2fb180b77f0fd3c1f573113a1cbfb7668320 IN  0x: Old ERC20 Proxy0.01 Ether0.0001685368
0xb71f2c673da5facf903c57d3307e8e5e7f68a4e23cff5a5dc4bdb1fd9b179c61Transfer71479272019-01-30 8:06:25960 days 18 hrs agoYobit.net IN  0x: Old ERC20 Proxy0.0012994 Ether0.0010533550
0x22ddff2efedc3c5bba4c14557084c1a76c00bbac74cee8e19a8805a6cba3dcdaTransfer69646492018-12-27 22:47:41994 days 3 hrs ago0x92529018605f9a6b1e91a877e84a3f52c81204fc IN  0x: Old ERC20 Proxy0.000848 Ether0.0001896039
0x0ffa9515ecb6a22f222dfb4ebecebd9ba363c5b987b1727abc543d243e1fbe43Transfer69646392018-12-27 22:44:37994 days 3 hrs ago0x92529018605f9a6b1e91a877e84a3f52c81204fc IN  0x: Old ERC20 Proxy0.00084 Ether0.0001896039
0xb57a0800c9ee7acc24a99ae56344ad80acc5d8009262316ba1edf9ba56976383Approve69118832018-12-19 0:05:071003 days 2 hrs ago0x4ddd1a015749b95276400d3cfa6f09fef5d8a94f IN  0x: Old ERC20 Proxy0 Ether0.0004958420
0x512e8d799785dced83e27f242304d45c3a76333173bdf3413f720e0196878abeTransfer Ownersh...62716482018-09-04 17:59:531108 days 8 hrs ago0x: Deployer 2 IN  0x: Old ERC20 Proxy0 Ether0.0005696220
0x1232f170a013977c85aa825d66808de70b3b3180d90ff037f6d21a11750d6464Add Authorized A...62716422018-09-04 17:59:251108 days 8 hrs ago0x: Deployer 2 IN  0x: Old ERC20 Proxy0 Ether0.0017125820
0x7dadf6b7bbb377d8e38c6897636e76697d68d6cfffee4e3ce9f9c6b7660a7e3d0x6080604062715832018-09-04 17:44:471108 days 8 hrs ago0x: Deployer 2 IN  Create: ERC20Proxy0 Ether0.021511420
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Latest 2 internal transactions
Parent Txn Hash Block From To Value
0x50171041cfdee328f986cc952ac589cf4dd0c6d0eafdaacae819a7f610931ea466609542018-11-07 15:40:281044 days 10 hrs ago 0xd4f5bf184bebfd53ac276ec6e091d051d0ed459e 0x: Old ERC20 Proxy0.032 Ether
0x8ff1a8166ced97145b08452710cfbba035277d8b5df6299794d0b90e92007b7766609402018-11-07 15:36:471044 days 10 hrs ago 0xd4f5bf184bebfd53ac276ec6e091d051d0ed459e 0x: Old ERC20 Proxy0.035 Ether
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Contract Source Code Verified (Exact Match)

Contract Name:
ERC20Proxy

Compiler Version
v0.4.24+commit.e67f0147

Optimization Enabled:
Yes with 1000000 runs

Other Settings:
default evmVersion
/**
 *Submitted for verification at Etherscan.io on 2018-09-04
*/

/*

  Copyright 2018 ZeroEx Intl.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

*/

pragma solidity 0.4.24;

contract IOwnable {

    function transferOwnership(address newOwner)
        public;
}

contract Ownable is
    IOwnable
{
    address public owner;

    constructor ()
        public
    {
        owner = msg.sender;
    }

    modifier onlyOwner() {
        require(
            msg.sender == owner,
            "ONLY_CONTRACT_OWNER"
        );
        _;
    }

    function transferOwnership(address newOwner)
        public
        onlyOwner
    {
        if (newOwner != address(0)) {
            owner = newOwner;
        }
    }
}

contract IAuthorizable is
    IOwnable
{
    /// @dev Authorizes an address.
    /// @param target Address to authorize.
    function addAuthorizedAddress(address target)
        external;

    /// @dev Removes authorizion of an address.
    /// @param target Address to remove authorization from.
    function removeAuthorizedAddress(address target)
        external;

    /// @dev Removes authorizion of an address.
    /// @param target Address to remove authorization from.
    /// @param index Index of target in authorities array.
    function removeAuthorizedAddressAtIndex(
        address target,
        uint256 index
    )
        external;
    
    /// @dev Gets all authorized addresses.
    /// @return Array of authorized addresses.
    function getAuthorizedAddresses()
        external
        view
        returns (address[] memory);
}

contract MAuthorizable is
    IAuthorizable
{
    // Event logged when a new address is authorized.
    event AuthorizedAddressAdded(
        address indexed target,
        address indexed caller
    );

    // Event logged when a currently authorized address is unauthorized.
    event AuthorizedAddressRemoved(
        address indexed target,
        address indexed caller
    );

    /// @dev Only authorized addresses can invoke functions with this modifier.
    modifier onlyAuthorized { revert(); _; }
}

contract MixinAuthorizable is
    Ownable,
    MAuthorizable
{
    /// @dev Only authorized addresses can invoke functions with this modifier.
    modifier onlyAuthorized {
        require(
            authorized[msg.sender],
            "SENDER_NOT_AUTHORIZED"
        );
        _;
    }

    mapping (address => bool) public authorized;
    address[] public authorities;

    /// @dev Authorizes an address.
    /// @param target Address to authorize.
    function addAuthorizedAddress(address target)
        external
        onlyOwner
    {
        require(
            !authorized[target],
            "TARGET_ALREADY_AUTHORIZED"
        );

        authorized[target] = true;
        authorities.push(target);
        emit AuthorizedAddressAdded(target, msg.sender);
    }

    /// @dev Removes authorizion of an address.
    /// @param target Address to remove authorization from.
    function removeAuthorizedAddress(address target)
        external
        onlyOwner
    {
        require(
            authorized[target],
            "TARGET_NOT_AUTHORIZED"
        );

        delete authorized[target];
        for (uint256 i = 0; i < authorities.length; i++) {
            if (authorities[i] == target) {
                authorities[i] = authorities[authorities.length - 1];
                authorities.length -= 1;
                break;
            }
        }
        emit AuthorizedAddressRemoved(target, msg.sender);
    }

    /// @dev Removes authorizion of an address.
    /// @param target Address to remove authorization from.
    /// @param index Index of target in authorities array.
    function removeAuthorizedAddressAtIndex(
        address target,
        uint256 index
    )
        external
        onlyOwner
    {
        require(
            authorized[target],
            "TARGET_NOT_AUTHORIZED"
        );
        require(
            index < authorities.length,
            "INDEX_OUT_OF_BOUNDS"
        );
        require(
            authorities[index] == target,
            "AUTHORIZED_ADDRESS_MISMATCH"
        );

        delete authorized[target];
        authorities[index] = authorities[authorities.length - 1];
        authorities.length -= 1;
        emit AuthorizedAddressRemoved(target, msg.sender);
    }

    /// @dev Gets all authorized addresses.
    /// @return Array of authorized addresses.
    function getAuthorizedAddresses()
        external
        view
        returns (address[] memory)
    {
        return authorities;
    }
}

contract ERC20Proxy is
    MixinAuthorizable
{
    // Id of this proxy.
    bytes4 constant internal PROXY_ID = bytes4(keccak256("ERC20Token(address)"));
    
    // solhint-disable-next-line payable-fallback
    function () 
        external
    {
        assembly {
            // The first 4 bytes of calldata holds the function selector
            let selector := and(calldataload(0), 0xffffffff00000000000000000000000000000000000000000000000000000000)

            // `transferFrom` will be called with the following parameters:
            // assetData Encoded byte array.
            // from Address to transfer asset from.
            // to Address to transfer asset to.
            // amount Amount of asset to transfer.
            // bytes4(keccak256("transferFrom(bytes,address,address,uint256)")) = 0xa85e59e4
            if eq(selector, 0xa85e59e400000000000000000000000000000000000000000000000000000000) {

                // To lookup a value in a mapping, we load from the storage location keccak256(k, p),
                // where k is the key left padded to 32 bytes and p is the storage slot
                let start := mload(64)
                mstore(start, and(caller, 0xffffffffffffffffffffffffffffffffffffffff))
                mstore(add(start, 32), authorized_slot)

                // Revert if authorized[msg.sender] == false
                if iszero(sload(keccak256(start, 64))) {
                    // Revert with `Error("SENDER_NOT_AUTHORIZED")`
                    mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                    mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
                    mstore(64, 0x0000001553454e4445525f4e4f545f415554484f52495a454400000000000000)
                    mstore(96, 0)
                    revert(0, 100)
                }

                // `transferFrom`.
                // The function is marked `external`, so no abi decodeding is done for
                // us. Instead, we expect the `calldata` memory to contain the
                // following:
                //
                // | Area     | Offset | Length  | Contents                            |
                // |----------|--------|---------|-------------------------------------|
                // | Header   | 0      | 4       | function selector                   |
                // | Params   |        | 4 * 32  | function parameters:                |
                // |          | 4      |         |   1. offset to assetData (*)        |
                // |          | 36     |         |   2. from                           |
                // |          | 68     |         |   3. to                             |
                // |          | 100    |         |   4. amount                         |
                // | Data     |        |         | assetData:                          |
                // |          | 132    | 32      | assetData Length                    |
                // |          | 164    | **      | assetData Contents                  |
                //
                // (*): offset is computed from start of function parameters, so offset
                //      by an additional 4 bytes in the calldata.
                //
                // (**): see table below to compute length of assetData Contents
                //
                // WARNING: The ABIv2 specification allows additional padding between
                //          the Params and Data section. This will result in a larger
                //          offset to assetData.

                // Asset data itself is encoded as follows:
                //
                // | Area     | Offset | Length  | Contents                            |
                // |----------|--------|---------|-------------------------------------|
                // | Header   | 0      | 4       | function selector                   |
                // | Params   |        | 1 * 32  | function parameters:                |
                // |          | 4      | 12 + 20 |   1. token address                  |

                // We construct calldata for the `token.transferFrom` ABI.
                // The layout of this calldata is in the table below.
                //
                // | Area     | Offset | Length  | Contents                            |
                // |----------|--------|---------|-------------------------------------|
                // | Header   | 0      | 4       | function selector                   |
                // | Params   |        | 3 * 32  | function parameters:                |
                // |          | 4      |         |   1. from                           |
                // |          | 36     |         |   2. to                             |
                // |          | 68     |         |   3. amount                         |

                /////// Read token address from calldata ///////
                // * The token address is stored in `assetData`.
                //
                // * The "offset to assetData" is stored at offset 4 in the calldata (table 1).
                //   [assetDataOffsetFromParams = calldataload(4)]
                //
                // * Notes that the "offset to assetData" is relative to the "Params" area of calldata;
                //   add 4 bytes to account for the length of the "Header" area (table 1).
                //   [assetDataOffsetFromHeader = assetDataOffsetFromParams + 4]
                //
                // * The "token address" is offset 32+4=36 bytes into "assetData" (tables 1 & 2).
                //   [tokenOffset = assetDataOffsetFromHeader + 36 = calldataload(4) + 4 + 36]
                let token := calldataload(add(calldataload(4), 40))
                
                /////// Setup Header Area ///////
                // This area holds the 4-byte `transferFrom` selector.
                // Any trailing data in transferFromSelector will be
                // overwritten in the next `mstore` call.
                mstore(0, 0x23b872dd00000000000000000000000000000000000000000000000000000000)
                
                /////// Setup Params Area ///////
                // We copy the fields `from`, `to` and `amount` in bulk
                // from our own calldata to the new calldata.
                calldatacopy(4, 36, 96)

                /////// Call `token.transferFrom` using the calldata ///////
                let success := call(
                    gas,            // forward all gas
                    token,          // call address of token contract
                    0,              // don't send any ETH
                    0,              // pointer to start of input
                    100,            // length of input
                    0,              // write output over input
                    32              // output size should be 32 bytes
                )

                /////// Check return data. ///////
                // If there is no return data, we assume the token incorrectly
                // does not return a bool. In this case we expect it to revert
                // on failure, which was handled above.
                // If the token does return data, we require that it is a single
                // nonzero 32 bytes value.
                // So the transfer succeeded if the call succeeded and either
                // returned nothing, or returned a non-zero 32 byte value. 
                success := and(success, or(
                    iszero(returndatasize),
                    and(
                        eq(returndatasize, 32),
                        gt(mload(0), 0)
                    )
                ))
                if success {
                    return(0, 0)
                }
                
                // Revert with `Error("TRANSFER_FAILED")`
                mstore(0, 0x08c379a000000000000000000000000000000000000000000000000000000000)
                mstore(32, 0x0000002000000000000000000000000000000000000000000000000000000000)
                mstore(64, 0x0000000f5452414e534645525f4641494c454400000000000000000000000000)
                mstore(96, 0)
                revert(0, 100)
            }

            // Revert if undefined function is called
            revert(0, 0)
        }
    }

    /// @dev Gets the proxy id associated with the proxy address.
    /// @return Proxy id.
    function getProxyId()
        external
        pure
        returns (bytes4)
    {
        return PROXY_ID;
    }
}

Contract Security Audit

Contract ABI

[{"constant":false,"inputs":[{"name":"target","type":"address"}],"name":"addAuthorizedAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"authorities","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"target","type":"address"}],"name":"removeAuthorizedAddress","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"owner","outputs":[{"name":"","type":"address"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"target","type":"address"},{"name":"index","type":"uint256"}],"name":"removeAuthorizedAddressAtIndex","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"getProxyId","outputs":[{"name":"","type":"bytes4"}],"payable":false,"stateMutability":"pure","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"authorized","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"getAuthorizedAddresses","outputs":[{"name":"","type":"address[]"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"newOwner","type":"address"}],"name":"transferOwnership","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"payable":false,"stateMutability":"nonpayable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"target","type":"address"},{"indexed":true,"name":"caller","type":"address"}],"name":"AuthorizedAddressAdded","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"target","type":"address"},{"indexed":true,"name":"caller","type":"address"}],"name":"AuthorizedAddressRemoved","type":"event"}]

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Swarm Source

bzzr://f6b2cadda0be9b47f37ed4a850b096e49b5e2e8bb7446d65481adecf980824a0
Block Transaction Difficulty Gas Used Reward
Block Uncle Number Difficulty Gas Used Reward
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