Crypto 101: Smart Contracts
In 2016, The DAO contract was attacked due to a code vulnerability. Ethereum subsequently underwent a hard fork, and the original chain that did not follow the fork continued as Ethereum Classic (ETC).
The Ethereum mainnet officially launched in July 2015, making it one of the earliest public blockchains to support Turing-complete smart contracts.
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Calling contracts on Ethereum requires paying Gas with $ETH .