In July 2016, the Ethereum network hard forked into two blockchains: Ethereum and Ethereum Classic. Ethereum Classic is now a completely separate cryptocurrency with different technological and philosophical goals. You can read more about Ethereum Classic and cryptocurrency forks.
The Ethereum network forked after an incident in July 2016. At that time, attackers exploited flaws in the smart contract code of a prominent application running on Ethereum called The DAO. In response to community concerns, the Ethereum Foundation implemented a hard fork to roll back all DAO-related transactions and allow the DAO's original contributors to reclaim their funds.
While many in the community supported the Ethereum hard fork, some chose to continue running the original Ethereum blockchain. That blockchain eventually became known as Ethereum Classic.
No. After the hard fork, Ethereum Classic has not received any updates directly from the Ethereum chain. Ethereum Classic and Ethereum are maintained as separate projects with different development teams contributing to each one.
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While both cryptocurrencies share the same address format, Ethereum Classic and Ethereum are their own distinct blockchains. Funds from one chain cannot truly be sent to the other. However, it is possible to confuse which addresses are registered to your Coinbase account for each asset, and accidentally send ETC or ETH to the other's address.
Coinbase does not support cross-chain address transactions, and does not guarantee that funds will be properly credited when one asset (ETC) is sent to the address of a different asset (ETH), or vice versa. Please make sure that you only receive funds using the specific deposit address displayed in your Coinbase account for the asset you are sending.
You can view your addresses on your crypto address page. Please exercise caution when sending or receiving Ethereum Classic (ETC) and Ethereum (ETH).
Please make sure you are using a blockchain explorer that supports Ethereum Classic (ETC), and that you are not searching the ETH blockchain by mistake.
Coinbase has limited support for smart contracts. We recommend that customers do not use Coinbase to send transactions to smart contracts, as many contracts have specific transaction requirements that cannot be customized when sending from Coinbase.