> ## Documentation Index
> Fetch the complete documentation index at: https://kleros-mintlify-6ebc7975.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Proof of Humanity

> Proof of Humanity verifies unique humans on-chain via video submissions, community vouching, and Kleros dispute resolution for Sybil-resistant Web3 apps.

# Proof of Humanity

<img src="https://mintcdn.com/kleros-mintlify-6ebc7975/6i-2aJXQiPgBJ2TJ/images/poh-hero.png?fit=max&auto=format&n=6i-2aJXQiPgBJ2TJ&q=85&s=6489b931768ba9a8903f88d17b67ae48" alt="Proof of Humanity Interface" width="2990" height="1716" data-path="images/poh-hero.png" />

<Warning>
  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.
</Warning>

**Proof of Humanity (PoH)** is a decentralized, Sybil-resistant registry of verified humans. It combines video verification, community vouching, and Kleros dispute resolution to create a trusted proof-of-personhood system, where each verified individual is linked to a unique, non-transferable digital identity.

PoH serves as the human verification layer for Web3, enabling applications to distinguish real humans from bots and duplicate accounts for fair governance, reputation systems, rewards, identity-gated experiences, UBI, and many other human-centric use cases.

***

## How It Works

<Steps>
  <Step title="Submit a Profile">
    Register by submitting a video of yourself holding your wallet address, along with a profile photo, display name, and a refundable deposit.
  </Step>

  <Step title="Get Vouched">
    A registered Proof of Humanity user must vouch for your submission, confirming that you're a unique human.
  </Step>

  <Step title="Challenge Period (In Review)">
    Your submission enters a challenge period, during which anyone can dispute it. Challenges are resolved by Kleros Court.
  </Step>

  <Step title="Become a Verified Human">
    If your submission is not challenged, or if you win a dispute, you become a verified human and receive a unique PoH Soulbound ID. Your registration expires periodically and must be renewed to remain active.
  </Step>
</Steps>

***

## PoH 2.0 (Product Update)

The PoH 2.0 product update introduced several improvements to make registration more accessible, secure, and interoperable:

**Lower registration cost**: PoH 2.0 was deployed on Gnosis Chain, significantly reducing registration fees and making it more accessible to users worldwide.

**PoH Soulbound IDs**: Every verified human receives a unique, non-transferable PoH Soulbound ID, providing a persistent digital identity that can be recovered even if the original wallet is lost.

**Cross-chain profiles**: Profiles can exist on multiple chains (Ethereum, Gnosis Chain), enhancing accessibility and interoperability. Users can maintain and transfer their verified identity across different chains.

**Improved UX**: Streamlined the registration process with a simpler interface, better guidance, and clearer status tracking.

<Note>
  These are product-level improvements. The underlying dispute resolution still uses the Kleros V1 arbitration protocol.
</Note>

***

## Use Cases

Proof of Humanity enables applications to distinguish real humans from bots, duplicate accounts, and autonomous agents. Below are some of the many ways projects can integrate PoH.

**Human Verification for the AI Era**: As AI agents become more capable of interacting online and on-chain, PoH enables applications to reliably distinguish real humans from bots and autonomous agents, preserving trust in digital systems.

**Governance and DAOs**: PoH enables one-person-one-vote governance by verifying that each participant is a unique human, helping DAOs and communities prevent Sybil attacks and governance manipulation.

**Fairdrops (Fair Rewards/Airdrops)**: PoH helps ensure that rewards, grants, incentives, and airdrops are distributed fairly by limiting participation to one verified human per identity.

**Universal Basic Income**: PoH provides a trusted registry of verified humans, allowing UBI programs to distribute funds fairly while preventing duplicate claims.

**Prediction Markets**: Prediction markets can use PoH to create human-only markets, limit participation to verified individuals, or reward unique human contributors.

Proof of Humanity also supports social recovery, digital credentials, decentralized social networks, and many other human-centric innovations.

***

## Start Building

Proof of Humanity is an open-source project. You are free to start integrating it into your project or building on top of it.

If you need support, reach out to Coopérative Kleros at [contact@kleros.io](mailto:contact@kleros.io), [Discord](https://discord.gg/kleros), or [Telegram](https://t.me/kleros).

***

## What's Next?

<CardGroup cols={2}>
  <Card title="Register on PoH" icon="user-check" href="https://v2.proofofhumanity.id/">
    Start your Proof of Humanity registration
  </Card>

  <Card title="PoH Integration Guide" icon="code" href="/developers/products/poh/integration">
    Verify human users in your application
  </Card>
</CardGroup>