The ethereum.org token tutorial, with the default supply set to two hundred million
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
Description
The minimal token from the ethereum.org tutorial: one mapping from address to balance, a sendCoin that moves value and emits CoinTransfer, and a public accessor. The whole supply goes to whoever deploys it. The deployer left the tutorial's guard that substitutes a default when the constructor is given zero, but changed that default to two hundred million. There is no approval mechanism and no total supply variable, so it predates the ERC-20 interface.
Source Verified
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
Source verified through compiler archaeology and exact bytecode matching.
View Verification ProofShow source code (Solidity)
// Submitted by EthereumHistory (ethereumhistory.com)
contract MyToken {
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 token(uint supply) {
if (supply == 0) supply = 200000000;
coinBalanceOf[msg.sender] = supply;
}
event CoinTransfer(address sender, address receiver, uint amount);
mapping (address => uint) public coinBalanceOf;
}External Links
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