To understand what Bitcoin mining is, we need to first comprehend Bitcoin itself and its transactions.
Bitcoin is a decentralized network where each participant operating within the Bitcoin system is a node in the network. Every node holds equal rights, runs the same program, and maintains a consistent ledger. Bitcoin transactions involve broadcasting transaction information to the Bitcoin network. Nodes that receive the information verify the messages and relay them further until the entire network is synchronized. Subsequently, the transaction information is bundled by miners into blocks and recorded in the blockchain ledger.
Mining involves a reward process that consists of two parts: 1. User transaction fees from Bitcoin transactions, and 2. Block rewards. For every block mined, a certain block reward is earned. According to Bitcoin's rules, the initial block reward was 50 bitcoins, and it halves approximately every 210,000 blocks, roughly every 4 years. After the third halving on May 12, 2020, the block reward per block became 6.25 bitcoins. This block reward incentivizes miners to record transactions and also facilitates the issuance of new bitcoins. The total number of bitcoins issued can be calculated using the formula 21 million = 210,000 * 50 * (1 + 1/2 + 1/4 + …). So, when the block reward eventually reaches 0, after all 21 million bitcoins have been issued, the rewards for mining will solely be the transaction fees paid by users.
Since miners are rewarded for their work, many compete to mine blocks. Bitcoin's design incorporates an algorithm to determine who gets to mine, known as the proof-of-work (PoW) consensus mechanism. The specific details of this mechanism are outlined in the Bitcoin whitepaper. In summary, miners use their computational power to solve hash puzzles. The miner who successfully solves the puzzle gains the right to record transactions and receives the block reward, which is bitcoins.
The process where miners perform calculations and receive rewards is called mining. The machines specifically designed for these calculations are referred to as mining rigs or miners, and the individuals who own these machines are called miners. The transaction fees paid for recording transactions are known as miner fees.
Concerning the potential issue of powerful miners speeding up the block creation process and depleting all available bitcoins, Bitcoin's protocol addresses this by automatically adjusting the mining difficulty. Every 2016 blocks, the system adjusts the difficulty based on previous block generation times to maintain an average block creation rate of approximately 10 minutes. This prevents the rapid depletion of bitcoins and ensures a consistent mining environment.
While more powerful miners might not significantly accelerate the block creation process in the long term, they do have a greater chance of receiving block rewards. The consensus mechanism that determines who gets to mine is known as proof-of-work (PoW), wherein miners with stronger computational power have a higher probability of solving the required hash puzzle and obtaining the right to record transactions and receive Bitcoin rewards.
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