Proof of Personhood(PoP)

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Proof of Personhood (PoP) makes this system possible.

In PoP, each node owner solves a puzzle called a "flip" to prove that they are "human."

Flips are designed to be difficult for computers to solve and can only be solved by humans (details below).

The crucial point is that these flips are performed "simultaneously" at a predetermined time.

Since the time allotted for answering is very short, humans cannot solve flips for multiple nodes at once. Therefore, managing multiple nodes per individual becomes difficult.