Proof of Humanity

Sybil-resistant identity registry combining video verification, social vouching, and dispute resolution

Proof of Humanity

Proof of Humanity uses the Kleros V1 protocol for dispute resolution even the “PoH 2.0” product version. The “2.0” refers to product improvements (cross-chain support, improved UX), not the underlying Kleros arbitration protocol version.

Proof of Humanity (PoH) is a Sybil-resistant registry of verified humans. It combines video verification, social vouching, and Kleros dispute resolution to create a decentralized identity system where each registered person is cryptographically linked to a unique Ethereum address.

PoH serves as the foundation for applications that need to distinguish real humans from bots and duplicate accounts enabling fairer airdrops, one-person-one-vote governance, and universal basic income distribution.

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How It Works

1. Submit a Profile

   Register by submitting a video of yourself holding your Ethereum address, along with a name and photo. A deposit is required to deter spam.

2. Get Vouched

   An already-registered human must vouch for you. Vouching is a web-of-trust mechanism: the voucher stakes their reputation on your legitimacy.

3. Challenge Period

   Your submission enters a challenge period. Anyone can challenge your registration (e.g., claiming you’re a duplicate or the video doesn’t meet requirements) by paying a challenge deposit. Challenges are resolved by Kleros Court.

4. Registration

   If unchallenged (or if you win the dispute), you’re registered as a verified human. Registration has an expiration period after which you must re-verify.

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PoH 2.0 (Product Update)

The PoH 2.0 product update introduced several improvements to the registration experience:

Cross-chain profiles: Profiles can exist on multiple chains (Ethereum, Gnosis Chain), enabling use across different ecosystems.

Improved UX: Simplified registration flow, better video guidance, and clearer status tracking.

Enhanced vouching: Refined vouching mechanics to strengthen the web-of-trust.

These are product-level improvements. The underlying dispute resolution still uses Kleros V1 contracts on Ethereum mainnet.

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Use Cases

Sybil-Resistant Governance: PoH-gated voting ensures one person = one vote, preventing token-whale domination. The Kleros yellow paper describes a future court mode where juror selection requires PoH registration.

Universal Basic Income: The UBI token project distributes a universal basic income stream to every registered PoH human.

Fair Airdrops: Projects can use PoH to ensure airdrop tokens go to unique humans rather than bots farming with multiple wallets.

Identity Verification: Any application that needs to verify a user is a unique human without relying on centralized KYC providers.

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What’s Next?

Register on PoH

Start your Proof of Humanity registration

PoH Integration Guide

Verify human users in your application