Credit Scores are another mechanism (proof of financial history).

This is true, but this relies me trusting your bank, and you trusting me enough to tell me your banking information.

This is easier when a service you are trying to prove you are human to is financial, e.g. to authenticate with Google AdWords they will send you a small random amount of money which is then used as a code to prove you own a bank account. This doesn’t work in a distributed ledger, but there you could just sign a transaction to prove you own an address.

I am just wondering if you could use a network of verified humans, i.e. notary, to sign your public key as proof. I think these gets into the world of certificate authorities and chains of trust. It also creates a world where you have to prove you are human to another human once per year.

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