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PoBU

A collection of 3 posts

PoBU: What the chain can’t show (yet)

PoBU: What the chain can’t show (yet)

In the last piece, we covered what the PoBU paper measures on a running chain: validator-set breadth and churn, and block-author concentration. Those are chain-derived signals anyone can reproduce. This next theme is about a simple line the paper keeps repeating in different ways: PoBU is about unique humans.But

PoBU, measured on a running chain

PoBU, measured on a running chain

In the last piece, we covered the threat model. The paper lists the main ways a PoBU system can fail or be weakened in practice: issuer concentration, compromise/coercion, availability, and privacy/linkability. Now comes the part many readers care about most: What can we actually measure on a live

What can go wrong in PoBU? (Threat model)

What can go wrong in PoBU? (Threat model)

In the last piece, we covered why PoBU is probabilistic. It explained that the strength of the “one eligible account per human” rule depends on two things: biometric error rates and policy choices. Now comes the next natural question: Even if the rule is clearly defined, what can still go