Ethash is a proof-of-work mining algorithm implemented by the Ethereum network and Ethereum-based cryptocurrencies. Ethash is a successor of the previous Ethereum algorithm called Dagger-Hashimoto and is, in fact, an upgrade of it. However, current development stages of both algorithms made them too different to be considered the same algo. Ethash uses “Keccak-256” and “Keccak-512” hash algorithms which leads to a little bit of confusion due to the simultaneous development SHA-3 (Secure Hash Algorithm 3) cryptographic standards along with Ethash development.

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