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Proof of Personhood, Explained
TL;DR
Proof of personhood proves a wallet belongs to a unique human. TrustLayer achieves it via peer vouching and behavioural signals — no biometrics, no KYC.
Key Facts
- ▸One person = one Trust ID (not one wallet).
- ▸TrustLayer uses peer vouches, not iris scans.
- ▸Works with WalletConnect out of the box.
- ▸Non-custodial: never held by the protocol.
- ▸Verifiable in a single Solidity view call.
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Why proof of personhood matters
Without it, airdrops, DAOs, and rewards collapse into farming. A single human running 10,000 wallets can drain any incentive program.
The main approaches
Worldcoin uses iris biometrics. Gitcoin Passport aggregates web2 stamps. BrightID uses video-call graph analysis. TrustLayer uses cryptographic peer vouching plus behavioural signals.
Trade-offs
Biometrics are strongest but privacy-invasive. Aggregated stamps are easy to game. Peer graphs are the best trade-off between privacy, resilience, and UX — which is why TrustLayer is peer-native.