Ethash
Web3 / mining staking
Ethash is the memory-hard proof-of-work algorithm that secured Ethereum from its genesis in 2015 until the September 2022 Merge to Proof of Stake. Designed specifically to resist ASIC mining dominance, Ethash required significant GPU memory to compute solutions, theoretically favoring consumer-grade hardware over specialized mining equipment. The algorithm used a large dataset called the DAG that grew over time, making it expensive to manufacture purpose-built ASIC miners. Despite these intentions, specialized Ethereum ASICs eventually emerged, though GPUs remained viable miners longer than on other proof-of-work chains, fostering a more distributed mining ecosystem. Example: During Ethereum's peak mining period in 2021, Ethash-based GPU mining generated substantial electricity consumption and hardware demand, with miners globally competing for block rewards worth thousands of dollars per block. Why it matters for mining and staking: Ethash's transition away exemplified cryptocurrency's evolution toward energy-efficient consensus. Its memory-hard design influenced subsequent algorithms and demonstrated the ongoing tension between ASIC-resistance and economic mining centralization across blockchain networks.
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