token

Token

0xc77f06da4c06...e69e71494c69

HomesteadContract #12KExact Bytecode MatchEdit this contract

Deployed March 14, 2016 (10 years ago)Block 1,145,833

Bare Homestead-era token (Mar 14 2016): public balanceOf mapping + a single unchecked transfer firing the standard Transfer event.

Homestead EraVerified Source

Historical Significance

A minimal ERC20-precursor token deployed the day Homestead launched, with no overflow/underflow guards on transfer.

Context

Compiled with the early soljson-v0.1.3 (optimizer ON); exact match of both runtime and creation bytecode reproduced from reconstructed source.

Token Information

Decimals

Key Facts

Deployer

0x88aa96...bbe34b

Deployment Block

1,145,833

Deployment Date

Mar 14, 2016, 03:00 AM

Code Size

184.0 B

Gas at Deploy

94,422

Transactions by Year

20161

Deployment Transaction: 0xb64678a989dd5308...c4319763fb672465

Description

A token from the ethereum.org tutorial. Balances sit in a public balanceOf mapping and transfer(to, value) moves them, throwing rather than returning false when the sender is short and checking the recipient's balance for overflow before adding to it. There is no owner and no way to create further units: the supply written at deployment is the whole supply.

Source Verified

SolidityExact bytecode match(184 bytes)

Compiler: soljson

View verification proof

Exact bytecode match. Runtime: 184 bytes (byte-for-byte). Creation: 245 bytes + 32-byte ABI-encoded constructor arg (initialSupply). Compiled with soljson-v0.1.3+commit.028f561d, optimizer ON.

Historian Categories

Token

Heuristic Analysis

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

Detected Type: Token

Has ERC-20-like patterns

Homestead Era

The first planned hard fork. Removed the canary contract, adjusted gas costs.

Block span: 1,150,000 — 1,919,999

March 14, 2016 — July 20, 2016

Bytecode Overview

Opcodes184

Unique Opcodes77

Jump Instructions8

Storage Operations6

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Solidity)

contract token {
    mapping (address => uint256) public balanceOf;
    event Transfer(address indexed from, address indexed to, uint256 value);
    function token(uint256 initialSupply) {
        balanceOf[msg.sender] = initialSupply;
    }
    function transfer(address _to, uint256 _value) {
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        Transfer(msg.sender, _to, _value);
    }
}

External Links

Etherscan Verified Source (if any)

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