Etherium classic (ETC) is the initial version of ethereum. The cryptocurrency was created and supported by enthusiasts after the fork of the main version. The error in smart contracts that were created for Ethereum DAO (decentralized crowdfunding platform) led to the loss of about 60 million US dollars. In this version the cryptocurrency has followed its initial philosophy which is based on the logic that there will be no external interference into smart contracts and the way they function. This project is not supported by the main team of developers.