Groundmark · DNS-anchored operator accountability
The opening steps of every scenario are the identical Level-0 core: resolve _agentid over DNSSEC, then verify the RFC 9421 request signature. Everything after is the same attestation machinery pointed at a different IDSP — a registry, a SaaS platform, or a licensing authority — carrying a different claim at a different level.
It is not three builds. It is one library wearing different actors and floors. The green L0 core markers in the flow show this spine live as you run any scenario.