Bytecode verified via sibling
This contract shares identical runtime bytecode with Directory (0x015cb512...) which has been verified through compiler archaeology.
A contract with no storage at all that exists only to write three indexed addresses into the log.
Historical Significance
addEntry(address,address,address) does one thing: it fires Entry(address indexed, address indexed, address indexed) and returns. Every argument is indexed, so all three land in the log topics and nothing goes in the data, and the contract keeps no storage of its own. It is a deliberate use of the event log as the database, with the chain paying for the index and the reader querying it by any of the three addresses. Source recovered by exact bytecode match: solc v0.1.7+commit.b4e666cc with the optimizer on reproduces all 127 bytes of the creation transaction.
Context
Deployed in 2015 on the Ethereum Frontier network.
Key Facts
Description
addEntry(address,address,address) does one thing: it fires Entry(address indexed, address indexed, address indexed) and returns. Every argument is indexed, so all three land in the log topics and nothing goes in the data, and the contract keeps no storage of its own. It is a deliberate use of the event log as the database, with the chain paying for the index and the reader querying it by any of the three addresses. Source recovered by exact bytecode match: solc v0.1.7+commit.b4e666cc with the optimizer on reproduces all 127 bytes of the creation transaction.
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 Directory {
event Entry(address indexed from, address indexed to, address indexed what);
function addEntry(address from, address to, address what) {
Entry(from, to, what);
}
}External Links
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