Frontier Era

The canonical name registration contract hardcoded into go-ethereum — Ethereum's first mainnet naming system, mapping human-readable strings to addresses. A dir

The content hash registry hardcoded into go-ethereum — maps key hashes (contract code hashes, domain name hashes) to content hashes. Part of the three-contract

The URL hint registry hardcoded into go-ethereum — maps content hashes to URL hints where the actual files (like NatSpec documentation) could be retrieved. Thir

The Coin contract from the Solidity tutorials. sendCoin and coinBalanceOf. One of 83 identical deployments.

Arbiter registry by Vitalik Buterin (Sep 2015). Pay 1+ ETH to list yourself. Fee decays 50%/month. One of the earliest on-chain reputation systems on Ethereum.

On-chain escrow by Vitalik Buterin (Sep 2015). Two parties designate arbiters; majority vote releases funds. One of the earliest smart contract dispute systems.

On-chain lottery from October 2015. Players buy tickets (1-25+ ETH with bulk discounts) in rounds of 1,000. Winners selected via combined server seed, client en

A tutorial contract testing fixed-size array passing as function parameters in Solidity.

A tutorial contract testing fixed-size array passing as function parameters in Solidity.

Second deployment of Vitalik's on-chain escrow (Oct 2015). Arbiters vote to release escrowed funds. Identical bytecode to the Sep 28 instance.

A minimal event-logging contract with a single function log(uint256) that emits MyEvent. Compiled with soljson v0.1.2, optimizer off.

Deployment of the official Solidity Greeter tutorial, initialized with "Hello World!" and compiled with soljson v0.1.1.

A Solidity date and time utility library deployed by Piper Merriam on October 6, 2015, providing functions to parse Unix timestamps into human-readable date com

Vitalik Buterin private lottery contract (Oct 2015). Single function: get(string). Minimum 0.007 ETH. Uses sha3+blockhash for randomness. Source not in any publ

Vitalik Buterin private lottery contract (Oct 2015). Single function: get(string). Minimum 0.007 ETH. Uses sha3+blockhash for randomness. Source not in any publ

Vitalik Buterin private lottery contract (Oct 2015). Three functions including a bet function (min 0.008 ETH) that calls an internal get(string) with hardcoded

Vitalik Buterin private lottery contract (Oct 2015). Three functions including a bet function (min 0.008 ETH) that calls an internal get(string) with hardcoded

Vitalik Buterin private lottery contract (Oct 2015). Most-used of the series. Three functions including bet (min 0.008 ETH). Source not in any public repo.

Vitalik Buterin private lottery contract (Oct 2015). Single function: get(string). Minimum 0.007 ETH. Uses sha3+blockhash for randomness. Source not in any publ

A Solidity string utility library authored by Piper Merriam and deployed on October 12, 2015, providing functions for converting between unsigned integers and s

This is the first of the 4 Etheria smart contracts, the first NFT collection on Ethereum.

adStorer auction registry by Vitalik Buterin (Oct 2015). Manages 8 ad auction slots. From dapp-bin ether_ad. Intermediate version, source not in public repo.

Vitalik Buterin ad auction registry contract (Oct 2015). From dapp-bin ether_ad project. Stores URLs and winners for 8 simultaneous one-phase and two-phase auct

The first post-v0.9 release of Etheria, a fully on-chain hexagonal tile world and one of the earliest NFT projects on Ethereum, deployed October 22, 2015.