Olympic: Frontier Pre-ReleaseHappened on May 9th, 2015On May 9th, 2015, the Olympic: Frontier pre-release was announced by the Ethereum Foundation. The release was meant as a proof-of-concept and included a bounty program to receive up to 25,000 Ether for things like sending out the most transactions, being the miner that includes the most transactions, or finding serious issues like creating a (substantial) fork between Go and C++ clients. https://blog.ethereum.org/2015/05/09/olympic-frontier-pre-release
