Verify a Signal

Don't trust the claim — check the Signal.

Got a Signal from a candidate? Paste it below and check it live — no login, no personal data. Just genuine, or not.

Paste a GOS code (dots or dashes both work) or a learner’s share token (gs1.…). The prefilled sample verifies on load.

What the check proves

Four things, every time.

Signed

A digital seal added the moment it's issued.

Tamper-evident

Change one character and it fails.

Expirable

Every Signal carries an expiry date.

Revocable

The learner can switch it off any time.

What you get back

The proof is public. The person stays private.

✓ / ✕

Valid or invalid

Date

Issued on

Date

Expires on

None

Personal data returned

Real cryptography (Ed25519, checked against published keys). The sample learner is fictional. Developers can run the same check from the command line — GET /api/v1/signal/verify, CORS-open, no key.