Reputation(REP)

This is the original Serpent-based Reputation (REP) token contract for the Augur decentralized prediction market. Deployed on October 4, 2016 at block 2,378,196, it held the REP token balances of participants who contributed to Augur's 2015 crowdsale — the first third-party token sale on Ethereum.

Notably, this contract was written in Serpent, a Python-like smart contract language that predated Solidity's dominance. Serpent was commonly used in Ethereum's earliest era (2015-2016) but was gradually abandoned due to security concerns and lack of tooling. The use of Serpent makes this contract a linguistic artifact of early Ethereum development.

The contract held approximately 8.8 million REP tokens distributed to crowdsale participants. When security researchers identified potential vulnerabilities in Serpent-compiled contracts, the Augur team migrated REP to a new Solidity-based contract (0xe94327d07fc17907b4db788e5adf2ed424addff6) in July 2017, with a freeze date of July 9, 2017. This migration represented one of the earliest large-scale token migrations on Ethereum.

REP was subsequently migrated again to REPv2 (0x221657776846890989a759BA2973e427DfF5C9bB) when Augur v2 launched in July 2020. This Serpent contract remains on-chain as the original home of one of Ethereum's earliest and most historically significant tokens.