Bitcoin mining is a challenging endeavor. When investing in traditional commodities like gold, copper, or oil, prospecting is typically conducted beforehand to ensure that capital invested in a mining project is not wasted. However, due to the inherent nature of Bitcoin’s security protocol, miners cannot prospect for resources, as discovering a block is a purely statistical and random occurrence. With only 144 blocks available each day, miners face significant uncertainty regarding timely rewards for their efforts unless they possess a substantial amount of hash rate.
To achieve consistent payouts and reduce revenue variability, a miner needs approximately 1.2% of the total hash rate, which is around 10 Exahashes per second as of now. The capital expenditure required to reach this level of hash rate can amount to hundreds of millions of dollars. For miners who are not large enterprises with extensive fleets of ASICs, this presents a significant challenge.
To tackle this issue, pool mining was developed. Consider a single miner with a modest yet notable mining operation. Out of the 52,560 blocks mined annually, he is expected to find one block, given that he holds 1/52,560th of the network’s total hash rate. This translates to an expectation of discovering one block every 12 months. However, his electricity bills are due every four weeks, and waiting an entire year for revenue would lead to bankruptcy.
To bridge the gap between ongoing costs and revenues, he decides to collaborate with 499 other miners with similar operations. They agree to mine collectively as if they were a single entity, sharing the mining rewards based on each miner’s contribution whenever a block is found. With this collective effort, the 500 miners are expected to find a block approximately twice a week, ensuring that their hard work is rewarded more frequently. This arrangement allows each miner to cover their monthly expenses and avoid financial ruin by the end of the year.
Despite the increased frequency of payouts through pool mining, there remains variability in the rewards. While miners receive payments more regularly compared to solo mining, the payouts are not guaranteed to align perfectly with each miner’s hashing power. This issue is often referred to as the pool’s luck risk.
Returning to the previous example, the 500 miners, each with 1/52,560th of the total hash rate, are collectively expected to find 500 blocks in a year. However, they might end up finding only 480, 497, or even 520 blocks. There is no certainty in the outcome, highlighting the inherent unpredictability of mining rewards in a pooled environment.
