# title
Event Chain Proof (Open Evidence Schema v1)

# description
Per-incident cryptographic chain verification report. A conforming implementation MUST report honestly about pre-chain events (rows that predate the hash chain migration are counted but not cryptographically verifiable).

# properties.tsa_anchoring.description
RFC 3161 third-party time anchoring summary. Upgrades the chain from "not rewritten since write" to "existed by wall-clock time T", which any external auditor can verify offline against the TSA public certificate. See /schema/v1/tsa-anchoring for the anchoring protocol spec.

# properties.tsa_anchoring.properties.providers_used.description
Names of TSA providers that signed at least one token on this incident (e.g. "freetsa.org").

# properties.tsa_anchoring.properties.anchors.description
Per-event anchoring status, ordered by chain_sequence_no ascending.