Ethereum Classic (ETC) is the original Ethereum blockchain, preserved by a minority of the community that refused to reverse the 2016 DAO hack and forked away when the majority chain did. Nearly a decade on, ETC still runs proof-of-work, still treats the pre-fork chain history as canon, and still markets itself on a single principle: code is law, transactions are final, no matter how painful the outcome.
What makes Ethereum Classic different
Technically, ETC is a close cousin to Ethereum: it's EVM-compatible, supports smart contracts and can run much of the same tooling developers use on Ethereum mainnet. The meaningful difference emerged in 2022, when Ethereum moved to proof-of-stake and ETC deliberately stayed on proof-of-work using its Etchash algorithm, positioning itself as the place for miners and for anyone who wants a PoW-secured, immutable alternative to Ethereum's newer, staking-based design. It has attracted backing over the years from institutional names like Grayscale, which runs a dedicated ETC trust, giving it a degree of traditional-finance visibility well beyond its on-chain activity.
Risks
ETC's biggest, most concrete problem is security. Because its hashrate is a fraction of Bitcoin's or even Ethereum's pre-Merge levels, it's been hit by multiple successful 51% attacks, in both 2019 and 2020, with attackers reorganising the chain and double-spending tens of millions of dollars' worth of ETC. Renting enough hashpower to threaten the network again is not a theoretical risk on ETC; it has happened repeatedly and remains cheaper than on most major chains. Beyond security, ETC's developer ecosystem and DeFi activity are a shadow of Ethereum's, and its main use case has narrowed over time to a store-of-value and mining-community narrative rather than a platform for new applications.
Anyone holding ETC for its immutability story should weigh that principle against a chain that has, in practice, proven far easier to attack than its market cap might suggest.