Oct 20, 2026Oct 20, 2026 · 4 min read · 1 viewHow Hashcash Works: Proof of Work Before BitcoinQuick Answer: Hashcash, created by Adam Back in 1997, introduced Proof of Work to combat email spam by requiring senders to solve a computationally asymmetric puzzle. By forcing senders to compute a h4 min read · 1 view
