Kavra Siegel — Qualified eIDAS Timestamping

You'd reach for this when you need legally binding timestamps on AI-generated content or workflow artifacts under European eIDAS regulations. It implements RFC 3161 timestamping through SIGNIUS and IDnow infrastructure, giving you qualified trust service provider backing rather than basic timestamping. The core use case is provenance: proving when an AI model made a decision, generated content, or processed data in contexts where audit trails matter, like regulated industries or content authenticity chains. It's streamable HTTP only, so it fits into web-based workflows where you're already passing artifacts around and need cryptographic proof of their creation time that holds up to legal scrutiny in the EU.