Sources
Where every figure on these pages comes from.
Step 14 of 141 min readUpdated October 5, 2026
Protocol#
- Satoshi Nakamoto, Bitcoin: A Peer-to-Peer Electronic Cash System (2008)
- Bitcoin developer guide: block chain
- Bitcoin developer reference: block headers
- Bitcoin Wiki: Difficulty
- Bitcoin Wiki: Controlled supply
- Bitcoin Core: difficulty adjustment (pow.cpp)
- Bitcoin Core: block subsidy (validation.cpp, GetBlockSubsidy)
Figures and data#
- Block 969,985 on mempool.space (header, coinbase, difficulty)
- Network hashrate, three-day average (mempool.space)
- Mining machine order of magnitude: Bitmain Antminer S21, 200 TH/s (manufacturer specification)
Browser hashrate (about 1.4 MH/s with Max): measured with Mini Miner on the development machine (a MacBook Pro), see DECISIONS.md. Block 969,985 was retrieved once, on 5 October 2026, and frozen in the code; the demonstrations recompute its hash instead of trusting the stored value.