Learn how proof of a person works.
Human verification covers three jobs: blocking bots, checking IDs, and proving a real person did a specific thing. Here are plain guides, fair comparisons and a short glossary.
Plain guides, one idea each.
Short reads on the ideas behind 5arz — what each one proves, and what it doesn’t.
Know Your Human
KYC says who a customer is. KYH proves a real person is behind an action.
Read the guide →Know Your Agent
Who enrolled an agent, and the real person at the moment it acts.
Read the guide →Proof of personhood
Is a real, ID-verified person behind this account?
Read the guide →Agentic commerce
Payment rails prove the agent paid. A seal proves the person behind it.
Read the guide →Verified Human
Seal photos, video and writing as made by a person. Free for creators.
Read the guide →The credential spec
The open PoHF credential: ES256 and JWKS, checked offline.
Read the spec →5arz next to the tools you know.
CAPTCHAs guess whether a visit is a bot. ID platforms check who someone is. 5arz proves a verified person did a specific action — and each comparison says when the other tool fits better.
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The words, in one line each.
Plain definitions of the terms used across 5arz and the wider identity world. Where a full guide exists, the card links to it.
- Proof of personhood
- A check that someone is a unique, real human — often one account per person.
- Read the guide →
- Know Your Human (KYH)
- Confirming a real person is behind an account, without handing over who they are.
- Read the guide →
- Sybil attack
- One actor running many fake accounts to look like many people.
- Guide coming
- Verifiable credential · SD-JWT VC
- A signed, tamper-evident claim. SD-JWT VC is the IETF format that can reveal only some fields.
- Read the spec →
- x402 verified human work
- Agents buying listed verified-human tasks over HTTP 402, paid in USDC on Base.
- Guide coming
Try a broader word, or ask us — we write the guides people ask for.
See a seal for yourself.
Check one in your browser — free, no account. Or start issuing them today.