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UNKNOWN = CLOSED (fail-closed). 60-second TTL. Holiday-aware, DST-correct, real-time halt detection for XNAS and XNYS only; schedule-based for the other 26.","documentationUrl":"https://headlessoracle.com/docs","exampleNote":"output.example is a real receipt captured 2026-06-05T16:03:15Z. 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Added to the signed payload by commit 19ccb28 (2026-09-07); the example below predates it.","type":"string"},"expires_at":{"description":"issued_at + 60s. 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