token

Token

0x45102439ac0f...3669af55f607

FrontierContract #1,444Exact Bytecode MatchEdit this contract

Deployed September 22, 2015 (11 years ago)Block 270,616

The guide's token with its transfer function duplicated under a second name

Frontier EraVerified Source

Historical Significance

The ethereum.org token tutorial is where most people who deployed a token in this period started, and this is its opening form: a balance mapping, a guarded subtraction and the metadata a wallet needs to show a name. It has no allowance, so nothing can spend on a holder's behalf and no exchange or escrow can be given a limit. That gap is exactly what ERC-20 was written to close, and copies like this one are the before picture.

Context

Deployed in September 2015 on the Frontier chain.

Key Facts

Deployer

0x4bbc2e...2b03c7

Deployment Block

270,616

Deployment Date

Sep 22, 2015, 01:21 AM

Code Size

1.1 KB

Gas at Deploy

300,444

Deployment Transaction: 0xa5baf283c38b41ff...e3756decb6e6d1ca

Description

The token from the Frontier contract tutorial, unchanged except that sendCoin appears twice: once under its own name and once as sendCoin2, with an identical body. Both check the sender's balance, move the amount between two entries in the balance mapping and emit CoinTransfer. Nothing distinguishes them, so the second is a copy left in place rather than a variant. The whole supply goes to the deployer at construction and there is no approval mechanism, which puts it before the ERC-20 interface.

Source Verified

Exact bytecode match(1,088 bytes)

Compiler: v0.1.3+

View verification proof

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 Opcodes106

Jump Instructions22

Storage Operations17

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

Verified on Etherscan

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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 sendCoin2(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;
    }
}