Install CiteSig.

Chrome extension

CiteSig Verifier checks the signature on every CiteSig claim on the pages you visit and shows a small badge beside each one. It is free, version 0.1.2, and works in Chrome and other Chromium-based browsers.

Add CiteSig Verifier from the Chrome Web Store →

Verification runs entirely in your browser. The extension collects no data and makes no network requests. See the privacy notice.

JavaScript and Node

Package @citesig/core, version 0.1.1.

npm install @citesig/core

Python

Package citesig, version 0.1.1.

pip install citesig

Using them

Both libraries sign a claim with an Ed25519 key and verify it without trusting the publisher. They share the same test vectors as the specification, and for the same input they produce byte-identical output, so a signature made in one language verifies in the other. Worked examples are on the home page.

Licenses

The libraries are licensed MIT. The specification is licensed CC BY 4.0.

Also from the same publisher

CiteSig is published by Machine Accountability Corporation, which also publishes DeepInquiry, a fact API whose every fact carries a CiteSig signature, and the Qollqa Register, a published register of court findings about machine-generated citations.