// Why Does This Matter?
Bitcoin mining is intentionally competitive. The network automatically adjusts difficulty every 2,016 blocks (~2 weeks) so that blocks are always found roughly every 10 minutes — no matter how much or how little hashrate is on the network. Every 4 years, the block reward halves. Miners who survive the halving do so because efficiency wins. This simulator models real economics: actual S9/S19/S21 XP specs, real network hashrate (~1.020 ZH/s in 2026), real electricity rates, and the real block reward (3.125 BTC post-2024 halving).