Chain-key Ether
From Internet Computer Wiki
Chain-key Ether (ckETH) is a token on the Internet Computer that is backed 1:1 by Ether (ETH) such that 1 ckETH can always be redeemed for 1 ETH and vice versa.
Unlike Chain-key Bitcoin (ckBTC), ckETH is currently not based on a direct integration but uses the EVM RPC canister to interact with Ethereum instead.
Detailed information can be found in the project documentation on GitHub.