Ethereum vs Ethereum Classic: The Split That Came From a Single Contested Decision
How one hack and one controversial reversal in 2016 created two separate chains that still exist today, and what each one has stood for ever since.
By Firoz Khan|3 August 2026|Updated 20 September 2026|7 min read
Ethereum and Ethereum Classic share the exact same history up to a single point in 2016, a hack, and a community decision about how to respond to it, that split what had been one chain into two permanently separate ones, each continuing under a different philosophy from that moment forward.
The DAO hack that triggered the split
The DAO, an early and prominent investment DAO built on Ethereum, was exploited in 2016, with an attacker draining a substantial share of its pooled funds through a flaw in its smart contract code. The Ethereum community faced a genuinely difficult choice: accept the loss as the unfortunate but immutable outcome of how the code executed, or intervene to reverse it.
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The hard fork that reversed the hack
The majority of the community chose to implement a hard fork that effectively reversed the hack's effects, moving the drained funds to a recovery contract. This new, forked chain continued as what's now known simply as Ethereum, the one virtually everyone means today when they say the name.
Ethereum Classic: the chain that refused to reverse it
A minority of the community rejected the intervention on principle, arguing that reversing a transaction, however unwelcome its outcome, violated the core promise of an immutable, unstoppable ledger. This group continued on the original, unaltered chain, which became Ethereum Classic, still running today with 'code is law' as its defining philosophy.
Why the two have diverged so sharply since
Ethereum went on to become the dominant smart contract platform, switching to proof of stake and hosting the overwhelming majority of DeFi and NFT activity. Ethereum Classic has continued on proof of work with a far smaller ecosystem and market capitalisation, valued today primarily by holders who specifically prioritise its immutability principle over Ethereum's greater practical scale and adoption.
A reminder
The FCA risk warning still applies to higher-risk crypto content. Always assess how much risk you are willing to take before buying.
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