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BitCoin

Proof of Work

00000000000000000021e800c1e8df51b22c1588e5a624bea17e9faa34b2dc4a

The leading zeros are the “proof-of-work”. The bitcoin mining algorithm tries various nonces and generates many hashes until it finds one with (currently) 18 leading zeros. Surprisingly, much of the Bitcoin community doesn’t know this and think that the leading zeros are special.