> ## Documentation Index
> Fetch the complete documentation index at: https://docs.world.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Proof of Human (PoH)

> High assurance biometric credential captured by the Orb and used for uniqueness.

export const CredentialHero = ({title, description, image, bgColor = "#1a1a2e", issuerName, issuerHref, issuerVerified, status, id, sybilResistance, sybilResistanceDescription, validityPeriod, sourceCodeHref}) => {
  return <div className="not-prose rounded-3xl bg-zinc-100 dark:bg-zinc-900">
      {}
      <div className="relative overflow-hidden rounded-t-3xl px-6 py-8 md:px-8 md:py-10" style={{
    backgroundColor: bgColor
  }}>
        <div className="flex items-center justify-between gap-6">
          <div className="min-w-0">
            <h2 className="m-0 text-2xl font-semibold text-white sm:text-3xl">
              {title}
            </h2>
            {description && <p className="m-0 mt-2 max-w-[420px] text-[15px] leading-relaxed text-white/75">
                {description}
              </p>}
          </div>
          {image && <img src={image} alt={title} className="hidden h-28 w-auto rounded-xl object-contain shadow-lg shadow-black/30 sm:block" />}
        </div>
      </div>

      {}
      <div>
        {issuerName && <div className="flex items-center gap-3 border-b border-zinc-200 px-6 py-3.5 text-[14px] md:px-8 dark:border-zinc-800">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="building" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              Issued by
            </span>
            <span className="inline-flex items-center gap-1">
              {issuerVerified && <Tooltip tip="Verified issuer">
                  <span className="inline-flex items-center cursor-help" style={{
    height: "20px"
  }}>
                    <Icon icon="circle-check" iconType="solid" size={14} color="#3b82f6" />
                  </span>
                </Tooltip>}
              {issuerHref ? <a href={issuerHref} target="_blank" rel="noopener noreferrer" className="font-medium text-zinc-900 underline decoration-zinc-300 underline-offset-2 hover:decoration-zinc-500 dark:text-zinc-100 dark:decoration-zinc-600 dark:hover:decoration-zinc-400">
                  {issuerName}
                </a> : <span className="font-medium text-zinc-900 dark:text-zinc-100">
                  {issuerName}
                </span>}
            </span>
          </div>}
        {status && <div className="flex items-center gap-3 border-b border-zinc-200 px-6 py-3.5 text-[14px] md:px-8 dark:border-zinc-800">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="signal" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              Status
            </span>
            {status === "active" && <span className="inline-flex items-center rounded-md bg-green-50 px-2 py-0.5 text-xs font-semibold text-green-700 ring-1 ring-green-600/20 ring-inset dark:bg-green-500/10 dark:text-green-400 dark:ring-green-500/20">
                Active
              </span>}
            {status === "beta" && <span className="inline-flex items-center rounded-md bg-blue-50 px-2 py-0.5 text-xs font-semibold text-blue-700 ring-1 ring-blue-600/20 ring-inset dark:bg-blue-500/10 dark:text-blue-400 dark:ring-blue-500/20">
                Beta
              </span>}
            {status === "deprecated" && <span className="inline-flex items-center rounded-md bg-amber-50 px-2 py-0.5 text-xs font-semibold text-amber-700 ring-1 ring-amber-600/20 ring-inset dark:bg-amber-500/10 dark:text-amber-400 dark:ring-amber-500/20">
                Deprecated
              </span>}
          </div>}
        {id != null && <div className="flex items-center gap-3 border-b border-zinc-200 px-6 py-3.5 text-[14px] md:px-8 dark:border-zinc-800">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="hashtag" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              ID
            </span>
            <span className="font-mono font-medium text-zinc-900 dark:text-zinc-100">
              {id}
            </span>
          </div>}
        {sybilResistance != null && <div className="flex items-center gap-3 border-b border-zinc-200 px-6 py-3.5 text-[14px] md:px-8 dark:border-zinc-800">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="shield-check" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              Sybil resistance
            </span>
            {sybilResistance === "some" ? <span className="inline-flex items-center gap-1.5">
                <span className="inline-flex items-center rounded-md bg-amber-50 px-2 py-0.5 text-xs font-semibold text-amber-700 ring-1 ring-amber-600/20 ring-inset dark:bg-amber-500/10 dark:text-amber-400 dark:ring-amber-500/20">
                  Some
                </span>
                {sybilResistanceDescription && <Tooltip tip={sybilResistanceDescription}>
                    <span className="cursor-help text-zinc-400 dark:text-zinc-500">
                      <Icon icon="circle-info" size={14} />
                    </span>
                  </Tooltip>}
              </span> : sybilResistance ? <span className="inline-flex items-center gap-1.5">
                <span className="inline-flex items-center rounded-md bg-green-50 px-2 py-0.5 text-xs font-semibold text-green-700 ring-1 ring-green-600/20 ring-inset dark:bg-green-500/10 dark:text-green-400 dark:ring-green-500/20">
                  Yes
                </span>
                {sybilResistanceDescription && <Tooltip tip={sybilResistanceDescription}>
                    <span className="cursor-help text-zinc-400 dark:text-zinc-500">
                      <Icon icon="circle-info" size={14} />
                    </span>
                  </Tooltip>}
              </span> : <span className="inline-flex items-center rounded-md bg-zinc-100 px-2 py-0.5 text-xs font-semibold text-zinc-500 ring-1 ring-zinc-500/20 ring-inset dark:bg-zinc-800 dark:text-zinc-400 dark:ring-zinc-500/20">
                No
              </span>}
          </div>}
        {validityPeriod && <div className="flex items-center gap-3 border-b border-zinc-200 px-6 py-3.5 text-[14px] md:px-8 dark:border-zinc-800">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="clock" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              <span className="inline-flex items-center gap-1">
                Validity period
                <Tooltip tip="The default duration period of the credential. Generally the maximum recommended sybil resistance window.">
                  <span className="cursor-help text-zinc-400 dark:text-zinc-500">
                    <Icon icon="circle-info" size={12} />
                  </span>
                </Tooltip>
              </span>
            </span>
            <span className="font-medium text-zinc-900 dark:text-zinc-100">
              {validityPeriod}
            </span>
          </div>}
        {sourceCodeHref && <div className="flex items-center gap-3 px-6 py-3.5 text-[14px] md:px-8">
            <span className="flex h-7 w-7 shrink-0 items-center justify-center rounded-lg bg-zinc-200/70 text-zinc-500 dark:bg-zinc-800 dark:text-zinc-400">
              <Icon icon="code" size={16} />
            </span>
            <span className="w-36 shrink-0 font-medium text-zinc-500 dark:text-zinc-400">
              SDK Reference
            </span>
            {sourceCodeHref === "coming-soon" ? <span className="inline-flex items-center gap-1.5 rounded-md bg-blue-50 px-2 py-0.5 text-xs font-semibold text-blue-700 ring-1 ring-blue-600/20 ring-inset dark:bg-blue-500/10 dark:text-blue-400 dark:ring-blue-500/20">
                <Icon icon="lock" size={11} />
                Coming soon
              </span> : <a href={sourceCodeHref} target="_blank" rel="noopener noreferrer" className="font-medium text-zinc-900 underline decoration-zinc-300 underline-offset-2 hover:decoration-zinc-500 dark:text-zinc-100 dark:decoration-zinc-600 dark:hover:decoration-zinc-400">
                {sourceCodeHref.split("/").pop()}
              </a>}
          </div>}
      </div>

      {}
      <div className="h-2" />
    </div>;
};

<CredentialHero title="Proof of Human" description="A high-assurance biometric credential using the Orb for uniqueness." image="https://mintcdn.com/tfh/ZHO_mxHjOzm0Y01N/images/docs/id/issuers/1/thumbnail.png?fit=max&auto=format&n=ZHO_mxHjOzm0Y01N&q=85&s=333fa8888475c22f2f3cfa92a98c29c2" bgColor="#6b5320" issuerName="World Foundation" issuerHref="https://world.org/" issuerVerified={true} status="active" id={1} sybilResistance={true} sybilResistanceDescription="Each human can only have one PoH credential." validityPeriod="3 years" sourceCodeHref="coming-soon" width="690" height="440" data-path="images/docs/id/issuers/1/thumbnail.png" />

## Introduction

The Proof of Human (PoH) Credential is the highest-assurance credential issued under World ID. Users obtain it by verifying at an Orb, a device that captures iris biometrics. The credential is an anonymous proof that the user is a unique, live human.

## Use Cases

Use the PoH Credential when you need a strong guarantee that you are interacting with a unique, live human. It is the right choice for:

* **Sybil resistance**: enforcing one account per human for airdrops, voting, rewards, or rate limiting.
* **High-assurance authentication**: gating sensitive actions where you need biometric confidence that you're interacting with the correct, unique human.
* **Proof of personhood**: distinguishing humans from bots, agents, and synthetic identities.

## Credential Structure

This credential implements the following attributes beyond the defaults in the [Credential](https://docs.rs/world-id-primitives/latest/world_id_primitives/credential/struct.Credential.html).

<table>
  <thead>
    <tr>
      <th className="whitespace-nowrap">Attribute</th>
      <th>Description</th>
    </tr>
  </thead>

  <tbody>
    <tr>
      <td className="whitespace-nowrap">
        <code>genesis\_issued\_at</code>
      </td>

      <td>The Unix timestamp of the user's first PoH credential. Remains constant across credential renewals.</td>
    </tr>

    <tr>
      <td className="whitespace-nowrap">
        <code>expires\_at</code>
      </td>

      <td>Unix timestamp when the credential expires. This is currently three years after the most recent issuance.</td>
    </tr>

    <tr>
      <td className="whitespace-nowrap">
        <code>associated\_data\_hash</code>
      </td>

      <td>
        The PoH credential has no associated data, so this field is always{" "}
        <code>FieldElement::ZERO</code>.
      </td>
    </tr>
  </tbody>
</table>

In addition, the credential implements the following claim:

### Claim 0 - Orb Credential Commitment

A commitment that binds the PoH credential to the Orb credential the user presented at issuance. This allows the PoH Issuer to attest that the credential was minted from a valid Orb verification without revealing the underlying Orb credential to relying parties.

| Source         | Value                                                            |
| -------------- | ---------------------------------------------------------------- |
| Orb credential | `H(hashes.json)` — the hash signed by the Orb during enrollment. |

## Credential Renewal

Users can renew their PoH credential to extend its validity as long as the Orb capture is deemed fresh by the issuer. Each renewal updates the credential with `expires_at = now + 3 years` while `genesis_issued_at` remains constant.

## Technical Reference

For issuer endpoints and implementation-specific details, see the [PoH Issuer reference](/world-id/reference/poh-issuer).