Human proof for modern text

Stamp your words with a human receipt.

SignedByAHuman creates a public receipt for text you choose to share. It proves a human took responsibility, not that they wrote every word.

Public receipts anyone with the link can verify
Captcha-verified identity badge
Copy a clean signature line in seconds

Write your content Paste or type the text you want to sign.

0 / 10000

Prove you're human +10 pts Automatic captcha - no action needed.

Add your Captcha site key in web/config.js.

Signature strength

✅ Baseline 0 / 110

Strengthen your signature Optional - add verifications to increase trust.

OAuth identity

+20 pts

Connect Google or Apple to verify a real account.

Show my email on the receipt (+5 pts) Show my profile photo on the receipt (+5 pts)

SMS phone verification

+10 pts

Confirms control of a real phone number.

Show my phone number on the receipt (+5 pts)

Passkey device check

+30 pts

Use Touch ID, Face ID, or a security key to prove device presence.

Proof of payment

+15 pts

Add economic friction to prove commitment.

Amount

How it works

1. Write or paste

Provide the text you want to sign. We compute two hashes to handle formatting changes.

2. Verify humanity

Verification confirms a human completed the flow. We attach a signed receipt with metadata.

3. Share the receipt

Copy a signature line that links to a verifiable receipt page.

FAQ

Does this prove authorship?

No. It proves a human took responsibility for the signed text.

What if formatting changes?

We compare both a strict hash and a normalized hash to allow copy-paste variations.

How long are signatures stored?

Receipts expire after 365 days in the MVP.

Stamp your words with a human receipt.

Signature receipt

How it works

1. Write or paste

2. Verify humanity

3. Share the receipt

FAQ

Does this prove authorship?

What if formatting changes?

How long are signatures stored?