Proof of Human
Graham Jenson
1442

Credit Scores are another mechanism (proof of financial history). This is problematic for many reasons that I won’t get into.

Similar + slightly better version: Proof-of-TransactionHistory (1. hard to fake, 2. easy to verify, 3. can adjust difficulty by looking further into past or looking for larger transactions, 4. there is no known answer, only unique patterns of transactions)

Ps: Awesome post

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