Rolling-code · HMAC-SHA256 · Data Matrix

Custom company seals, encrypted for the modern era.

Design a distinctive corporate seal, then issue tamper-evident copies encoded with a rolling HMAC signature. Every stamp carries a Data Matrix payload that authenticates against your registry in one scan.

The archive

Twelve starting points

Customize any preset →

Classic Notary

Corporate Ink

Royal Wax

Modern Minimal

Government Crest

Bank Vault

Legal Estate

Craft Guild

Vineyard Estate

Maritime Registry

Academy Insignia

Shipping Chain

Design

Start from a preset or a blank die. Tune shape, ink, gold, typography, and text.

Encode

Each issued seal bumps a counter, then embeds an HMAC-signed Data Matrix payload.

Verify

Anyone with the scan can validate authenticity, issue date, and revocation status.