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.

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

0 / 10000

Prove you're human Automatic captcha — no action needed.

Captcha human check

+20 pts

Invisible check — runs automatically.

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

Strengthen your signature Optional — add verifications to increase trust.

OAuth identity

+25 pts

Connect Google or Apple to verify a real account.

Show my email on the receipt (+10 pts) Show my profile photo on the receipt (+10 pts)

SMS phone verification

+20 pts

Confirms control of a real phone number.

Passkey device check

+35 pts

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

Proof of payment

+20 pts

Add economic friction to prove commitment.

Amount

Signature strength

✅ Baseline 0 / 150

Verification

Signature receipt

Paste a signature link to load a receipt.

Original content

Sign another message

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

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

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

This MVP uses hosted receipts. Anyone with the receipt link can view the signed text and verify it, so only sign content you are comfortable sharing.

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

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

Receipts expire after 365 days in the MVP.