How unlikely was it for one solo miner to beat the odds and win a Bitcoin block?
On June 5, 2025, a solo miner pulled off what most would call impossible: solving a Bitcoin block alone and earning over $330,000 in Bitcoin block rewards.
And they did it during the most competitive mining conditions in Bitcoin’s history.
At the time, Bitcoin’s difficulty was encoded as nBits: 0x1b38a1b5. That string defines the target for miners: The resulting hash of their block must fall below a certain threshold.
The lower the target, the harder the job. At this level, miners are racing to find a suitable hash out of more than 126 trillion possibilities.
That’s what made this win so unlikely.
Even though the miner in question temporarily inflated their hashrate to around 259 petahashes per second (PH/s) for a short time, it still had a 1 in 3,050 chance of finding a valid block before someone else on the global network.
Also, unlike industrial mining farms with massive setups, this miner was solo, just one machine submitting hashes through the Solo CKPool.
The miner likely rented a massive burst of computing power for a short time to make it work. It was a calculated gamble, spike the hashrate, take a shot and hope to strike gold.
It worked.
Did you know? Solo CKPool, the platform used in this $330,000 win, has recorded fewer than 100 solo block wins in its entire history, making each one a statistical anomaly in a sea of pooled mining dominance.
$330K Bitcoin solo mining 101
What is Bitcoin mining?
Bitcoin mining is the process of verifying transactions and adding them to the blockchain.
Miners bundle transactions into a block, then repeatedly hash the block header, altering a small “nonce” value until the resulting SHA‑256 double-hash falls below the network’s target.
That hash target is what the nBits and difficulty encode. The first miner to discover a valid hash earns the reward and sees their block appended, maintaining the ledger and issuing new Bitcoin (BTC).
Bitcoin mining difficulty 2025 explained
Bitcoin aims to produce one block every 10 minutes to balance security, network synchronization and predictable Bitcoin issuance.
To keep this pace steady despite fluctuations in total network computing power (hashrate), the protocol adjusts difficulty every 2,016 blocks (about every two weeks).
If block times…
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