Returns the recorded daily head-hash checkpoint for
(tenant_id, date) as written by the anchoring job. The
manifest itself is stored in S3 Object Lock (WORM) and is
signed with an Ed25519 key; this endpoint returns the mirror
stored in Postgres. Third-party auditors can cross-check the
head_hash against the signed S3 manifest (verifying the
signature locally) and, optionally, supply their own
expected_head_hash to get an immediate boolean match.
Unauthenticated by design — the anchors are public evidence.
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UTC day, YYYY-MM-DD.
Optional. When provided, the response includes hash_matches.
Anchor found
True when an anchor row exists for the given (tenant_id, date).
Hex-encoded sha256 of the audit-log chain head as of the anchor date.
Object key of the signed manifest in the anchor S3 bucket.
Present only when the caller provided expected_head_hash.