Satoshi Nakamoto Predicted Bitcoin’s Hash Defense 16 Years Before Quantum Fears

Sixteen years ago, Satoshi Nakamoto answered a doubter on a forum in 2010, and the reply still guides Bitcoin's network defense today. On July 16, 2010, user bdonlan questioned Bitcoin's double SHA-256 hashing on Bitcointalk, asking whether the design weakened security. Satoshi's response predicted Bitcoin's hash defense before quantum fears emerged.