Bittrex style deposit wallet whose registry lookup is named sweeperFor.
Historical Significance
A reminder that a bytecode group can be separated from a near identical one by nothing more than a renamed function. The selector for sweeperFor is not recorded in the public signature databases, so recovering the name meant deriving it from the four bytes that differed.
Token Information
Key Facts
Description
A per-customer exchange deposit wallet in the Bittrex pattern. Its sweep function asks a registry which sweeper handles a given token and then delegatecalls into it with the original calldata, so the token handling logic runs in the wallet's own storage context. It carries both the payable fallback and the ERC-223 hook. The one thing that separates it from the widely deployed version is the name of the registry function it calls: sweeperFor rather than sweeperOf. That single rename changes four bytes of the compiled code, which is what put this group in a bytecode family of its own. The runtime code matches the deployed bytecode byte for byte. Only the trailing swarm metadata hash differs, because the EthereumHistory attribution comment changes the source text. Sourcify records this as a partial match and Etherscan shows it as verified.
Source Verified
Byzantium Era
First Metropolis hard fork. Added zk-SNARK precompiles, REVERT opcode, and staticcall.
Bytecode Overview
Verified Source Available
Source verified through compiler archaeology and exact bytecode matching.
View Verification ProofShow source code (Solidity)
// Submitted by EthereumHistory (ethereumhistory.com)
pragma solidity ^0.4.10;
// Copyright 2017 Bittrex
contract AbstractSweeper {
function sweep(address token, uint amount) returns (bool);
function () { throw; }
Controller controller;
function AbstractSweeper(address _controller) {
controller = Controller(_controller);
}
modifier canSweep() {
if (msg.sender != controller.authorizedCaller() && msg.sender != controller.owner()) throw;
if (controller.halted()) throw;
_;
}
}
contract Token {
function balanceOf(address a) returns (uint) {
(a);
return 0;
}
function transfer(address a, uint val) returns (bool) {
(a);
(val);
return false;
}
}
contract DefaultSweeper is AbstractSweeper {
function DefaultSweeper(address controller)
AbstractSweeper(controller) {}
function sweep(address _token, uint _amount)
canSweep
returns (bool) {
bool success = false;
address destination = controller.destination();
if (_token != address(0)) {
Token token = Token(_token);
uint amount = _amount;
if (amount > token.balanceOf(this)) {
return false;
}
success = token.transfer(destination, amount);
}
else {
uint amountInWei = _amount;
if (amountInWei > this.balance) {
return false;
}
success = destination.send(amountInWei);
}
if (success) {
controller.logSweep(this, destination, _token, _amount);
}
return success;
}
}
contract UserWallet {
AbstractSweeperList sweeperList;
function UserWallet(address _sweeperlist) {
sweeperList = AbstractSweeperList(_sweeperlist);
}
function () public payable { }
function tokenFallback(address _from, uint _value, bytes _data) {
(_from);
(_value);
(_data);
}
function sweep(address _token, uint _amount)
returns (bool) {
(_amount);
return sweeperList.sweeperFor(_token).delegatecall(msg.data);
}
}
contract AbstractSweeperList {
function sweeperFor(address _token) returns (address);
}
contract Controller is AbstractSweeperList {
address public owner;
address public authorizedCaller;
address public destination;
bool public halted;
event LogNewWallet(address receiver);
event LogSweep(address indexed from, address indexed to, address indexed token, uint amount);
modifier onlyOwner() {
if (msg.sender != owner) throw;
_;
}
modifier onlyAuthorizedCaller() {
if (msg.sender != authorizedCaller) throw;
_;
}
modifier onlyAdmins() {
if (msg.sender != authorizedCaller && msg.sender != owner) throw;
_;
}
function Controller()
{
owner = msg.sender;
destination = msg.sender;
authorizedCaller = msg.sender;
}
function changeAuthorizedCaller(address _newCaller) onlyOwner {
authorizedCaller = _newCaller;
}
function changeDestination(address _dest) onlyOwner {
destination = _dest;
}
function changeOwner(address _owner) onlyOwner {
owner = _owner;
}
function makeWallet() onlyAdmins returns (address wallet) {
wallet = address(new UserWallet(this));
LogNewWallet(wallet);
}
function halt() onlyAdmins {
halted = true;
}
function start() onlyOwner {
halted = false;
}
address public defaultSweeper = address(new DefaultSweeper(this));
mapping (address => address) sweepers;
function addSweeper(address _token, address _sweeper) onlyOwner {
sweepers[_token] = _sweeper;
}
function sweeperFor(address _token) returns (address) {
address sweeper = sweepers[_token];
if (sweeper == 0) sweeper = defaultSweeper;
return sweeper;
}
function logSweep(address from, address to, address token, uint amount) {
LogSweep(from, to, token, amount);
}
}