What was the idea of “proof of work,” used in Bitcoin mining, originally designed for?
One detail: the Bitcoin white paper cites Adam Back’s Hashcash when introducing proof of work.
The core property of proof of work is that it’s “hard to compute, easy to verify”: finding a hash that meets the requirements takes many attempts, while verifying it takes just one calculation.
Remember this rather than memorizing a bunch of terminology. Cross-check messages from multiple parties before deciding; don’t just listen to one person’s account.
$BTC ’s mining mechanism follows Adam Back’s Hashcash approach.