Contract 0x8230d81e3dae...b7c0e8816a58

Token

0x8230d81e3dae...b7c0e8816a58

FrontierContract #1,447Exact Bytecode MatchEdit this contract

Deployed September 22, 2015 (10 years ago)Block 270,632

The guide's token, with its duplicated transfer called issueCoin

Frontier EraVerified Source

Context

Frontier and Homestead era deployment.

Key Facts

Deployer

0x4bbc2e...2b03c7

Deployment Block

270,632

Deployment Date

Sep 22, 2015, 01:26 AM

Code Size

1.1 KB

Gas at Deploy

300,444

Deployment Transaction: 0xa7201863bb686922...31914b87a75536d2

Description

The Frontier guide's token contract, deployed with its send function present twice: once as sendCoin and once, byte for byte identical in body, as issueCoin. The same contract published at 0x45102439 carries the duplicate under the name sendCoin2, and the twelve bytes that differ between the two deployments are the dispatcher entry for that one name plus the two jump targets that follow from the entries sorting differently. Whoever deployed this had a reason to call the second copy issuance rather than a second send, though it does exactly what the first one does: check the sender's balance, move the amount, log a CoinTransfer.

Source Verified

Exact bytecode match(1,088 bytes)

Compiler: v0.1.1+

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Heuristic Analysis

The following characteristics were detected through bytecode analysis and may not be accurate.

Detected Type: Token

Has ERC-20-like patterns

Frontier Era

The initial release of Ethereum. A bare-bones implementation for technical users.

Block span: 0 — 1,149,999

July 30, 2015 — March 14, 2016

Bytecode Overview

Opcodes1,088

Unique Opcodes107

Jump Instructions22

Storage Operations17

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

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Show source code (Solidity)

// Submitted by EthereumHistory (ethereumhistory.com)
contract token {
    mapping (address => uint) public coinBalanceOf;

    event CoinTransfer(address sender, address receiver, uint amount);

    function token(uint supply) {
        coinBalanceOf[msg.sender] = supply;
    }

    function sendCoin(address receiver, uint amount) returns(bool sufficient) {
        if (coinBalanceOf[msg.sender] < amount) return false;
        coinBalanceOf[msg.sender] -= amount;
        coinBalanceOf[receiver] += amount;
        CoinTransfer(msg.sender, receiver, amount);
        return true;
    }

    function issueCoin(address receiver, uint amount) returns(bool sufficient) {
        if (coinBalanceOf[msg.sender] < amount) return false;
        coinBalanceOf[msg.sender] -= amount;
        coinBalanceOf[receiver] += amount;
        CoinTransfer(msg.sender, receiver, amount);
        return true;
    }
}