Before Ethereum's shift to proof-of-stake, one name towered above every other ETH mining pool: Ethermine. At its peak, it was pulling in nearly half of the entire network's hash rate, making it the single biggest contributor to block discovery on Ethereum. Even today, with GPU mining officially in the rearview mirror, Ethermine's name still haunts crypto Twitter threads and miner forums alike.

So what exactly is Ethermine, how did it get so dominant, and does the pool still have a future? Let's break it down.

What Is Ethermine and Why It Mattered

Ethermine is a cryptocurrency mining pool that launched in 2016, operated by the team behind Bitfly, a European blockchain infrastructure company. Its sole mission was simple: aggregate the hash power of thousands of individual miners so they could earn more consistent payouts than solo mining would ever allow.

By 2021, Ethermine had become the largest Ethereum pool on the planet. At its height, it accounted for roughly 44% of Ethereum's total network hash rate, a staggering concentration of mining power that made it a critical piece of infrastructure for the entire ETH ecosystem.

Who Actually Ran It

Behind the pool sat Bitfly, a Switzerland-based company co-founded by Kristof Koch. Bitfly also operates the popular etherchain.org analytics dashboard, which became the de facto place for miners to track gas prices, network stats, and their own workers. The two services worked hand in hand, giving Ethermine a polished, data-rich user experience that many competing pools struggled to match.

How Ethermine's Pool Mechanics Worked

Like most major pools, Ethermine used a payout scheme designed to reduce variance for solo miners. The pool combined everyone's computational power to find blocks more frequently, then distributed the rewards proportionally based on how much hash each miner contributed.

Payout Structure

Ethermine ran on a PPLNS (Pay Per Last N Shares) model, which rewards miners based on the number of shares submitted in the rounds leading up to a found block. This system is widely considered fair because it discourages pool hoppers who try to game payouts by switching pools mid-round.

  • Pool fee: 1% on most payouts, competitive with industry standards.
  • Minimum payout threshold: Adjustable by the miner, with a default of 0.05 ETH.
  • Payout frequency: Automatic, triggered as soon as the threshold was reached.
  • Transparency: Real-time dashboards showing worker status, hash rate, and pending balances.

Miners could point their rigs at Ethermine using standard Stratum protocols, and the pool supported a wide range of mining software including PhoenixMiner, T-Rex, lolMiner, and Claymore's dual miners.

The Merge and What It Meant for Ethermine

Then came The Merge in September 2022, the long-anticipated transition that moved Ethereum from proof-of-work to proof-of-stake. Overnight, GPU mining on Ethereum became obsolete. Block rewards for miners dropped to effectively zero, and the hash rate that had once powered the network evaporated.

For Ethermine, this was an existential moment. The product it had spent nearly six years perfecting was suddenly worthless. The ethermine.org homepage displayed a simple notice, and Bitfly pivoted its focus toward Ethereum validator infrastructure and analytics tools.

What Happened to the Hash Power

Most former Ethermine miners scattered to other proof-of-work chains:

  • Ethereum Classic (ETC) – the obvious ideological home for ETH refugees.
  • Ravencoin (RVN) – a KAWPOW chain popular with GPU operators.
  • Ergo (ERG) and other smaller algos picked up modest inflows.
  • Kaspa (KAS) – the kHeavyHash chain that attracted a wave of ex-Ethereum rigs.

Ethermine itself did not launch new pools for these chains at scale, leaving the field open to compe*****s like Nanopool, F2Pool, 2Miners, and ViaBTC.

Ethermine vs. Other Mining Pools

Even during its dominance, Ethermine wasn't the only game in town. The mining pool market has always been brutally competitive, with operators undercutting each other on fees, payout thresholds, and server reliability.

How It Stacked Up

  • vs. SparkPool: SparkPool briefly rivaled Ethermine's dominance in Asia but shut down amid regulatory pressure in 2021, leaving Ethermine as the undisputed leader.
  • vs. Nanopool: Comparable fees, but Nanopool supported more altcoins, while Ethermine stayed laser-focused on ETH.
  • vs. F2Pool: A veteran Chinese pool that held influence but couldn't match Ethermine's sheer size on Ethereum alone.
  • vs. Hiveon: A newer entrant offering zero-fee mining as a loss-leader to build out its ecosystem.

Ethermine's competitive edge was never just raw hash rate. It was the combination of a clean interface, reliable servers, transparent payouts, and the integration with etherchain.org that kept miners loyal.

Key Takeaways

Ethermine was more than just a mining pool. It was the backbone of Ethereum's proof-of-work era, processing a meaningful slice of every block the network ever produced under the old consensus model.

  • Ethermine peaked at nearly half of Ethereum's total hash rate before The Merge.
  • It ran on the PPLNS payout model with a 1% fee and low minimum payouts.
  • The Merge in 2022 effectively ended GPU mining on Ethereum, reshaping the entire mining pool landscape.
  • Bitfly, the operator, continues to run analytics tools like etherchain.org while miners moved on to ETC, Kaspa, and other proof-of-work chains.
  • Although no longer relevant for ETH, Ethermine remains a useful case study in how a single pool can become critical infrastructure for an entire blockchain.

The pool may be a relic of a bygone era, but its impact on crypto mining history is permanent. Anyone studying how decentralized networks really operate under the hood still has a lot to learn from Ethermine's rise, dominance, and quiet retirement.