Jokoin

Token

0x14cd3aa183ee...7adfed6dd181

FrontierContract #3,307Exact Bytecode MatchEdit this contract

Deployed November 4, 2015 (10 years ago)Block 490,778

Standard ethereum.org tutorial token (Frontier, Nov 2015): name/symbol/decimals metadata, a public balanceOf mapping and an overflow-checked transfer firing the

Frontier EraVerified Source

Historical Significance

An early Frontier-era (Nov 2015) deployment of the canonical ethereum.org tutorial token, built unoptimized with the v0.1.5 compiler.

Context

Compiled with soljson-v0.1.5 (optimizer OFF); exact match of the 1225-byte runtime.

Token Information

Token Name

Jokoin

Decimals

Key Facts

Deployer

0xb40a18...cb55fd

Deployment Block

490,778

Deployment Date

Nov 4, 2015, 10:35 PM

Code Size

1.9 KB

Gas at Deploy

430,723

Deployment Transaction: 0x96410272c5a9649d...a7b320dd633d297c

Source Verified

SolidityExact bytecode match(1,971 bytes)

Compiler: soljson

View verification proof

Exact runtime bytecode match. Runtime: 1225 bytes (byte-for-byte), compiled with soljson-v0.1.5+commit.23865e39, optimizer OFF. The on-chain creation (1971 bytes) appends ABI-encoded constructor args (initialSupply, tokenName, decimalUnits, tokenSymbol); the 1225-byte runtime is the shared cluster invariant.

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

Opcodes1,971

Unique Opcodes126

Jump Instructions73

Storage Operations34

Verified Source Available

Source verified through compiler archaeology and exact bytecode matching.

View Verification Proof

Show source code (Solidity)

contract Token {
    string public name;
    string public symbol;
    uint8 public decimals;
    mapping (address => uint256) public balanceOf;
    event Transfer(address indexed from, address indexed to, uint256 value);
    function Token(uint256 initialSupply, string tokenName, uint8 decimalUnits, string tokenSymbol) {
        balanceOf[msg.sender] = initialSupply;
        name = tokenName;
        symbol = tokenSymbol;
        decimals = decimalUnits;
    }
    function transfer(address _to, uint256 _value) {
        if (balanceOf[msg.sender] < _value) throw;
        if (balanceOf[_to] + _value < balanceOf[_to]) throw;
        balanceOf[msg.sender] -= _value;
        balanceOf[_to] += _value;
        Transfer(msg.sender, _to, _value);
    }
}

External Links

Etherscan Verified Source (if any)

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