RSS for state. Open portable evidence layer for machine state - preserving what an agent or system saw, produced, derived and learned, so another party or future agent can verify the lineage independently.
A lightweight TypeScript library for the full OpenTimestamps lifecycle: stamp, upgrade, and verify -- with optional React components. Works in browsers and Node.js. Zeitstempel is German for "timestamp". This is the TypeScript sibling of zeitstempel, a Rust CLI for the same purpose.