Tutorial-derived coin contract (Solidity v0.1.1), one of multiple FirstCoin instances deployed by the same address on Aug 8, 2015.
Key Facts
Description
One of five FirstCoin instances deployed by 0x4b0C6F0297CEe4B551B6fab3277067B64B238990 on August 8, 2015, during the first days of the Ethereum Frontier era. The bytecode is identical across all instances — a minimal coin contract with coinBalanceOf, sendCoin, and CoinTransfer event, compiled with Solidity v0.1.1.
The repeated deployments within hours suggest iterative testing or tutorial experimentation. The contract pattern closely mirrors the coin examples from the Ethereum Frontier Guide. At least nine total FirstCoin deployments occurred between August 8–11, 2015, from four different deployer addresses — making it one of the most replicated early tutorial contracts on mainnet.
See the first instance (0x3c401b518252abe3bbbf898a44939699e7da1634) for full documentation.
Heuristic Analysis
The following characteristics were detected through bytecode analysis and may not be accurate.
Frontier Era
The initial release of Ethereum. A bare-bones implementation for technical users.
Bytecode Overview
Verified Source Available
This contract has verified source code on Etherscan.
View Source CodeShow source code (Solidity)
contract FirstCoin {
mapping (address => uint) public coinBalanceOf;
event CoinTransfer(address sender, address receiver, uint amount);
function FirstCoin(uint supply) {
coinBalanceOf[msg.sender] = 1000000;
}
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;
}
}