In a rare stroke of luck amid intensifying competition, a solo Bitcoin miner has successfully mined block 899,826, earning a windfall reward of $330,386.
The feat occurred at 3:48 a.m. UTC on June 5, according to data from Mempool.space.
The miner operated under the Solo CK Pool and pocketed a 3.125 BTC block subsidy—valued at around $104,828 per Bitcoin at the time—plus an additional 0.026 BTC in transaction fees. The block contained 3,680 transactions, with average fees hovering around $0.29 and a median fee rate of just two satoshis per virtual byte (sat/vB), reflecting low network congestion.
What makes this accomplishment even more remarkable is the backdrop of soaring Bitcoin mining difficulty, which hit a historic high of 126.98 trillion on June 1, as reported by Blockchain.com. This surge reflects increasing miner participation and a stronger, more secure network, making solo block discoveries increasingly improbable.
Con Kolivas, the developer behind CKPool, revealed in a June 5 post on X that the solo miner had recently ramped up their hashrate to an eye-popping 259 petahashes per second (PH/s)—a significant jump from the account’s usual output. Kolivas noted that only one mining worker was connected to the pool, strongly indicating a rented hashrate, possibly from a cloud mining or marketplace service, used in a high-risk, high-reward attempt to secure a block reward.
“Though the account has been mining for a while with a much lower hashrate,”
Kolivas explained.
Solo mining successes have become increasingly rare due to the overwhelming odds posed by modern network difficulty. Still, 2025 has seen a few notable solo victories.
On March 10, a solo miner with a modest, budget-friendly rig mined block 887,212, netting 3.15 BTC, worth roughly $263,000 at the time. Another solo miner struck gold on April 29, solving a Bitcoin block alone, claiming the full 3.125 Bitcoin (BTC) block reward.
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