A 2015 tutorial token renamed to Coin, matched at runtime; its deployment code came from a source that has not been recovered.
Historical Significance
A plain instance of the tutorial token from the months before ERC-20, when the interface for moving a balance was still sendCoin and the event announcing it was still CoinTransfer.
Context
Ethereum's Frontier network went live on 30 July 2015. The tutorial token of that period predates ERC-20: balances are read through coinBalanceOf and transfers sent with sendCoin.
Key Facts
Description
A copy of the pre-ERC-20 tutorial token: one public balance mapping, a sendCoin(receiver, amount) that checks the sender's balance and returns false rather than reverting when it is short, and a CoinTransfer event on success. There is no approval, no allowance and no metadata.
The runtime code matches the recovered source exactly, so what the contract does is settled. The deployment code does not match, so the exact constructor its author compiled is still unknown.
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
External Links
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