Contract 0x00593a338897...26a2d1742d09

Token

0x00593a338897...26a2d1742d09

FrontierContract #2,775Exact Bytecode MatchEdit this contract

Deployed October 25, 2015 (10 years ago)Block 438,304

Variant of the ethereum.org 'Dapps for Beginners' subcurrency (Frontier 2015): sendCoin transfer, public coinBalanceOf mapping, CoinTransfer event, token() mint

Frontier EraVerified Source

Historical Significance

An early Frontier-era teaching subcurrency from the original ethereum.org contract tutorial; this variant mints via a token() function rather than a constructor.

Context

Compiled with soljson-v0.1.3 (optimizer ON); exact match of both runtime and creation bytecode. One of 54 byte-identical deployments of this contract.

Key Facts

Deployer

0x8d0b69...1a2016

Deployment Block

438,304

Deployment Date

Oct 25, 2015, 03:47 PM

Code Size

296.0 B

Gas at Deploy

95,721

Deployment Transaction: 0x1d03871de0b2fda3...8ac40b072b2317f0

Source Verified

SolidityExact bytecode match(296 bytes)

Compiler: soljson

View verification proof

Exact bytecode match. Runtime: 278 bytes (byte-for-byte). Creation: 296 bytes (byte-for-byte). Compiled with soljson-v0.1.3+commit.028f561d, optimizer ON. token()-mint variant of the ethereum.org 'Dapps for Beginners' subcurrency.

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

Opcodes296

Unique Opcodes81

Jump Instructions15

Storage Operations8

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Solidity)

contract Coin {
    mapping (address => uint) public coinBalanceOf;
    event CoinTransfer(address sender, address receiver, uint amount);
    function token(uint _index) {
        if (_index == 0)
            _index = 70000000;
        coinBalanceOf[msg.sender] = _index;
    }
    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;
    }
}

External Links

Etherscan Verified Source (if any)

Related contracts

Multiply7

Same deployer

The hello-world of Solidity: multiply(x) returns x*7. The ethereum.org tutorial contract. 120 copies deployed Sep 2015 through Feb 2016.

0xfc3c99...90d3d6October 24, 2015

token

Same era

An early ERC-20-like token deployed in Ethereum's first week, built directly from the example in the official Ethereum Frontier Guide documentation.

0x8374f5...46609aAugust 7, 2015

token

Same era

A second deployment of the FirstCoin tutorial token by the same creator, 11 blocks after the original — both derived from the official Ethereum Frontier Guide e

0x3b4446...295f52August 7, 2015

Contract 0xd958b5...ec4c9f

Same era

Ethereum.org tutorial Coin contract deployed on Frontier day 1. Contains a bug: balance(address) ignores its argument and returns msg.sender balance.

0xd958b5...ec4c9fAugust 7, 2015

NameRegistry

Same era

Fixed-fee name registry from Day 9 of Ethereum (Aug 8, 2015). Reserve names for 69 ETH, resolve addresses. A precursor to ENS.

0xa1a111...b8af00August 8, 2015

token

Same era

Early tutorial-derived coin contract compiled with Solidity v0.1.1, deployed 9 days after Ethereum Frontier launch.

0x3c401b...da1634August 8, 2015