In an extraordinary display of mathematical luck, a solo Bitcoin miner operating with just 70 terahashes per second (TH/s) of computing power successfully solved block 944,306 in late 2024, earning 3.128 BTC in the process. This feat, which would have been virtually impossible under normal circumstances, has captured the attention of the cryptocurrency community and highlighted the unpredictable nature of proof-of-work mining.
The block, discovered on November 28, 2024, contained a coinbase reward of 3.125 BTC plus approximately 0.003 BTC in transaction fees. While the monetary value was significant—worth roughly $200,000 at the time—the real story lies in the statistical improbability of the achievement.
Understanding Bitcoin Mining and Block Rewards
Bitcoin mining operates on a probabilistic system where miners compete to solve complex cryptographic puzzles. The difficulty of these puzzles adjusts approximately every two weeks to maintain a target block time of approximately 10 minutes. When the network difficulty stands at around 100 trillion hashes, a solo miner with 70 TH/s represents an infinitesimally small portion of the total network hashrate.
The network’s total hashrate during this period exceeded 600 exahashes per second (EH/s), meaning our solo miner controlled approximately 0.000012% of the network’s computing power. To put this in perspective, a typical modern ASIC miner like the Antminer S21 Pro produces around 200 TH/s—nearly three times the entire hashrate of this solo operation.
Block rewards consist of the coinbase reward (currently 3.125 BTC following the April 2024 halving) plus transaction fees included in the block. The 3.128 BTC earned represents the complete block reward at the time of discovery.
The Mathematics Behind the Achievement
To understand just how remarkable this achievement was, we need to examine the mathematics of solo mining. A miner’s expected time to find a block can be calculated using the following formula:
Expected time = (Difficulty × 2³²) / (Hashrate × 60)
At the time of block 944,306, with a network difficulty of approximately 82 trillion and assuming 70 TH/s, a solo miner would expect to wait roughly 4,000 years before finding a block. The probability of finding a block in any given 10-minute window with 70 TH/s is approximately 1 in 57 million.
This is comparable to winning a major lottery jackpot several times in succession. The solo miner effectively beat odds that most mathematicians would describe as effectively impossible—which is exactly what makes this event so newsworthy in the Bitcoin community.
Solo Mining vs. Pool Mining
The Bitcoin mining ecosystem primarily operates through two models: solo mining and pool mining. Each approach carries distinct advantages and disadvantages that influence miner behavior.
Pool Mining involves multiple miners combining their resources to increase collective chances of solving a block. When the pool successfully finds a block, rewards are distributed proportionally among participants based on their contributed hashrate. This approach provides steady, predictable income at the cost of reduced individual payouts.
Solo Mining means the miner works independently, keeping the entire block reward if they succeed, but accepting the high variance inherent in the probabilistic system. Most solo miners today operate with substantial hashrate—typically multiple petahashes—because the mathematical odds become more favorable with scale.
The 70 TH/s solo miner represents a fringe participant in the ecosystem, someone who either operates very old hardware or runs a small operation with minimal investment. In a landscape dominated by industrial-scale mining operations with hashrates measured in petahashes, this achievement stands as a testament to pure probability.
Technical Implementation and Block Details
Block 944,306 contained standard Bitcoin transactions, with the successful proof-of-work solution found through the lucky solution. The block’s header included the nonce and other parameters that satisfied the difficulty target, allowing the miner to broadcast their solution to the network and claim the reward.
The mining software typically used for solo operations includes combinations of ASIC firmware, Bitcoin Core full nodes, and specialized mining software like BFGMiner or CGMiner. The solo miner would have been running a Bitcoin node to validate the mempool, construct the block template, and attempt solutions.
For a miner with such low hashrate, the critical technical requirement is maintaining continuous operation. Any downtime reduces the already minimal probability of success. The successful block suggests either exceptional luck or remarkably consistent uptime.
The 2024 Bitcoin Mining Landscape
The period surrounding block 944,306 saw significant developments in the Bitcoin mining industry. Following the April 2024 halving, block rewards decreased from 6.25 BTC to 3.125 BTC, fundamentally altering the economic calculus for miners worldwide.
Many operations faced pressure as profit margins contracted. Some miners shut down less efficient equipment, while others sought regions with cheaper electricity. The network’s total hashrate experienced fluctuations during this period, creating windows of opportunity for small-scale participants.
The successful solo miner emerged during this competitive environment, proving that despite the industry’s increasing professionalization, individual participants can still occasionally capture block rewards through pure chance.
Industry Reactions and Community Response
The Bitcoin community responded with widespread disbelief and celebration. On platforms like X (formerly Twitter) and Bitcoin-focused forums, users debated the implications of this event. Some questioned whether the reported hashrate was accurate, while others celebrated the democratizing potential of proof-of-work mining.
Crypto analyst firms noted that such events, while rare, serve important functions in the Bitcoin ecosystem. They reinforce that the protocol remains accessible to anyone with computing power, regardless of scale. The mathematical fairness of proof-of-work means that a small miner has the same theoretical chance as a large mining farm for each individual block attempt.
Prominent Bitcoin advocates highlighted this event as demonstration of Bitcoin’s censorship-resistant properties. Unlike traditional financial systems where small participants face barriers to entry, anyone can participate in mining with any amount of hashrate.
The Economics of Small-Scale Mining
At current BTC prices, the 3.128 BTC reward would be worth approximately $200,000. For a solo miner with 70 TH/s, the electricity costs to maintain this operation would be minimal given the small scale. If running older-generation ASIC hardware like the Antminer S9 (which produces approximately 13 TH/s), the miner might operate 5-6 units, consuming around 1,000-1,500 watts.
At average US electricity rates of approximately $0.12 per kWh, the daily electricity cost would be roughly $3-4. The expected return on investment, calculated over the mathematical expected time to find a block, would still be negative—underscoring that this event represented an outlier, not a viable business model.
This mathematical reality leads most rational small-scale miners to join mining pools, trading some expected value for reduced variance and more predictable returns. The solo miner behind block 944,306 either understood this and accepted the lottery-like odds, or perhaps operated with older hardware they had already fully depreciated.
The Nature of Probabilistic Systems
This event illuminates fundamental properties of proof-of-work cryptographic systems. Bitcoin’s security model relies on the randomness of hash outputs—when miners submit billions of hashes per second, each attempt has an equal, independent probability of success.
The memoryless property of the probability distribution means that a miner’s past failures do not influence future chances. Whether a miner has gone 10 minutes or 10 years without finding a block, their probability for the next attempt remains identical. This characteristic ensures fairness but also creates extreme variance for small-scale participants.
Block 944,306 represents the extreme positive tail of this distribution. For the solo miner, the wait time between blocks could have been anywhere from seconds to decades—mathematically, both outcomes are equally probable given enough time. They simply happened to find themselves on the favorable side of the distribution.
Frequently Asked Questions
Q: What is TH/s and what does it mean for Bitcoin mining?
TH/s stands for terahashes per second, measuring how many cryptographic hash calculations a miner can perform each second. A higher TH/s means more attempts at solving the block puzzle per second, increasing the probability of finding a valid block. The network’s total hashrate is measured in exahashes per second (EH/s), where 1 EH/s equals 1 million TH/s.
Q: How rare is it for a solo miner with 70 TH/s to find a block?
The probability is approximately 1 in 57 million per block attempt. This means that mathematically, such a miner would expect to wait roughly 4,000 years on average before finding a block—making this event extraordinarily lucky. Many miners would never experience such luck in a lifetime of operation.
Q: How much did the miner earn from this block?
The solo miner earned 3.128 BTC total: 3.125 BTC from the coinbase reward plus approximately 0.003 BTC in transaction fees. At current market prices, this amounts to roughly $200,000, making it a substantial windfall despite the miniscule probability of success.
Q: Why do most miners join pools instead of solo mining?
Mining pools combine hashrate from multiple participants to smooth out the variance in block discovery. While individual payouts are smaller, participants receive more predictable income. For a small miner with 70 TH/s, the expected time to find a block solo is so long that pool participation makes more economic sense for most participants.
Q: Is this event good for Bitcoin’s decentralization?
Events like this demonstrate that Bitcoin remains accessible to participants at any scale. While industrial mining operations dominate the network, the protocol technically allows anyone with any amount of hashrate to participate. Such lucky breaks, while rare, reinforce that no single entity controls block production.
Q: Could this happen again?
Yes, mathematically it remains possible. While the probability is extremely low, proof-of-work systems do not discriminate based on scale. Any miner, regardless of hashrate, has a non-zero probability of solving the next block. This probabilistic fairness is a core feature of Bitcoin’s design.
Conclusion
The discovery of block 944,306 by a solo miner operating with just 70 TH/s represents one of the most remarkable achievements in Bitcoin’s history. This event, with probability odds around 1 in 57 million, earned the fortunate miner approximately 3.128 BTC—worth roughly $200,000 at the time.
Beyond the immediate financial outcome, this block serves as a powerful demonstration of Bitcoin’s foundational properties. The protocol remains permissionless and accessible, with no minimum threshold for participation. The mathematical fairness of proof-of-work ensures that every miner, regardless of scale, competes on equal terms for each individual block.
For aspiring miners and Bitcoin enthusiasts, this event offers both inspiration and caution. Inspiration, because it proves that anyone can theoretically capture a block reward. Caution, because such outcomes represent statistical outliers rather than reliable income strategies. Most miners should continue joining pools for predictable returns.
The solo miner behind block 944,306 will likely remain anonymous—a fitting end for someone who won the Bitcoin lottery through pure chance. Their achievement stands as a testament to the unpredictable nature of cryptographic proof-of-work and the enduring appeal of Bitcoin’s permissionless, probabilistic design.