A rare and remarkable event in the Bitcoin mining world occurred recently when an independent miner validated an entire Bitcoin block — earning the full block subsidy of 3.125 BTC — after spending only about $75 on rented computing power. 

The feat was confirmed by mining firm Braiins on social media and reflected on‑chain data.

According to Braiins, the miner successfully mined Bitcoin block 938092 — earning the full 3.125 BTC subsidy, worth roughly $200,000 at current prices — after renting about 1 petahash per second (PH/s) of hashpower via an on‑demand service. 

The total rental cost was reported as roughly 119,000 satoshis (about $75). 

The operation was coordinated using CKPool, a platform that lets solo miners broadcast and submit block solutions while retaining full block rewards when successful.

This result came not from owning large mining hardware, but from temporary, rented hashrate — a model that lets hobbyists and smaller operators participate in Bitcoin mining without massive upfront investment. 

On‑demand hashrate essentially acts like a cloud‑based mining service, allowing users to rent SHA‑256 compute for a set period and point it at a mining pool or network target.

Why this is so rare

Solo block rewards in Bitcoin mining have become increasingly uncommon as the network’s total computing power and difficulty have climbed. 

Large mining pools dominate block production because they combine massive hashpower from many miners, dramatically improving odds of finding blocks. 

By contrast, individual miners — especially those using modest or rented hashpower — face very low probabilities of solving a block on their own.

Data aggregator Bennet shows only 21 solo miners have found blocks over the past year, a total of about 66 BTC worth approximately $4.1 million at current prices — representing roughly one solo block every 17.2 days on average. That rate is a fraction of the thousands of blocks produced daily across the Bitcoin network.

Even so, these solo wins — whether achieved with home rigs, small miners, or rented compute — stand out as statistical outliers, akin to lottery wins in traditional finance, rather than indicative of a broader shift in mining strategy.

The event also occurred against the backdrop of recent volatility in mining difficulty. After significant downward pressure from winter storms that temporarily knocked hashrate offline in key mining regions, Bitcoin’s difficulty rebounded sharply — climbing about 15% to 144.4 trillion in the latest adjustment. 

That rebound followed an earlier 11% drop tied to weather‑related outages, described as the sharpest decline in network hashpower since China’s 2021 mining crackdown.

Difficulty adjustments, which occur roughly every 2,016 blocks (~two weeks), are critical in balancing the network’s average block time to ~10 minutes and in calibrating the computational effort required to find new blocks. 

Big swings in network hashpower — whether from weather disruptions, miner shutdowns, or equipment turnover — can temporarily create conditions where lower‑cost, rented hashpower bets have better odds than usual.