{"schemaVersion":1,"asset":"BTC","reportDate":"2026-10-01","timestamps":{"currentSnapshotAt":"2026-10-01T16:30:00+00:00","previousSnapshotAt":"2026-09-30T16:30:00+00:00","generatedAt":"2026-10-01T16:30:54+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-10-01","source":"Derivasys proprietary historical SVI surface and canonical BTC index databases","comparison":"Nearest successful surface snapshots approximately 24 hours apart","rrConvention":"25-delta call IV minus 25-delta put IV","bfConvention":"Average 25-delta wing IV minus ATM forward IV","fixedTenors":"Fixed-tenor measures are published only when listed expiries bracket the target at both comparison snapshots. 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RV annualises the mean squared observed one-minute log return; returns spanning gaps are excluded, not interpolated or zero-filled. Partial estimates assume observed minutes are representative and may miss volatility during gaps."},"spotUnavailableReason":null,"oneWeekAtmIvPercent":29.99,"oneWeekIvMinus7dRvPoints":-2.6,"oneWeekIvMinus24hRvPoints":-2.62,"oneWeekIvMinus30dRvPoints":-5.29,"oneWeekIvTo7dRvRatio":null,"spreadPercentile":null},"realisedVolatilityUnavailableReason":null}