Bitcoin Mining Mechanics, Network Metrics and Profitability Constraints

Bitcoin mining processes transactions, secures candidate blocks, and distributes newly created bitcoin. Miners employ specialized ASIC hardware to repeatedly test nonces through the SHA-256 cryptographic algorithm until finding a block header hash that meets the network's target threshold. The entity that discovers a valid block secures a fixed reward of 3.125 BTC—set following the April 20, 2024 halving—together with the aggregate transaction fees paid within that block.

Network data as of October 22, 2026, shows a total computing power of approximately 1,050 exahashes per second, with network difficulty standing at 140.6 trillion after a 5.9 percent upward adjustment on October 16. Blocks are calibrated to appear every ten minutes, prompting difficulty reassessments every 2,016 blocks. Over the preceding 1,008 blocks, transaction fees averaged 0.0166 BTC per block.

Profitability depends heavily on power expenses. For example, an Antminer S21 XP delivering 270 TH/s generates roughly €9.10 in daily gross revenue while consuming 87.5 kilowatt-hours of power, requiring an electricity rate below roughly 10.4 cents per kilowatt-hour to break even. Under Germany's average household electricity rate of 37.0 cents per kilowatt-hour recorded in August 2026, operating the unit costs approximately €32.40 daily. For German individual taxpayers, mining revenue remains exempt under Section 22 No. 3 of the Income Tax Act provided total annual income under that category remains under €256.