As time goes on, you will accumulate keys from other people…
As time goes on, you will accumulate keys from other people that you may want to designate as trusted introducers. Everyone else will each choose their own trusted introducers.
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And everyone will gradually accumulate and distribute with their key a collection of certifying signatures from other people, with the expectation that anyone receiving it will trust at least one or two of the signatures.
This will cause the emergence of a decentralized fault-tolerant web of confidence for all public keys.
#WoT