Sealcord
Not open yet

Every key will carry its own seal.

Sealcord will sign your app’s licence keys with your product’s Ed25519 key, so the app can check them with no network at all. It is not open yet: leave your email to hear when it is.

One email when Sealcord opens, and news about the launch. Every email has a link to unsubscribe.

Your address goes to Resend, the email service Sealcord uses, and stays on the launch list there. Sealcord’s own servers keep no copy. Privacy notice

An Ed25519 signature over this page’s headline, made when the page was built, in base64url.
sealcord.com/notice/v1
Drawn from the 64 bytes of that signature. Every signature draws its own.

What Sealcord will do.

  1. Keys your app checks offline

    Each key holds the licence and an Ed25519 signature made with your product’s key. The public key ships inside your app, so a mistyped or tampered key fails on the spot, with no network call.

  2. Seats you can count on

    Each machine takes a seat on its first run. Sealcord enforces the limit and answers with a signed verdict the app keeps, so it goes on working on a plane.

  3. One API call issues a licence

    Your own backend or checkout issues a licence with one call to Sealcord’s API, whichever payment provider took the payment.

  4. Customers free their own seats

    Someone who replaces a laptop frees the old machine’s seat themselves, without writing to you.