{"schemaVersion":1,"asset":"BTC","reportDate":"2026-10-02","timestamps":{"currentSnapshotAt":"2026-10-02T16:30:00+00:00","previousSnapshotAt":"2026-10-01T16:30:00+00:00","generatedAt":"2026-10-02T16:31:56+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-10-02","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. Targets outside either observable range are suppressed, not extrapolated; headline rankings use only supported tenors.","realisedVolatility":"Annualised root-mean-square of one-minute canonical BTC-USD index log returns using a 365-day basis; all windows end at the current snapshot."},"tenors":[{"tenor":"1W","targetExpiry":1791563400036,"availability":"available","unavailableReason":null,"atmIv":{"current":28.62,"previous":29.99,"change":-1.37,"percentChange":-4.57},"rr25":{"current":-0.61,"previous":-1.32,"change":0.71,"percentChange":53.79},"bf25":{"current":1.73,"previous":1.96,"change":-0.23,"percentChange":-11.73}},{"tenor":"2W","targetExpiry":1792168200036,"availability":"available","unavailableReason":null,"atmIv":{"current":31.46,"previous":32.49,"change":-1.03,"percentChange":-3.17},"rr25":{"current":-0.6,"previous":-1.47,"change":0.87,"percentChange":59.18},"bf25":{"current":1.84,"previous":2.07,"change":-0.23,"percentChange":-11.11}},{"tenor":"1M","targetExpiry":1793550600036,"availability":"available","unavailableReason":null,"atmIv":{"current":33.86,"previous":33.94,"change":-0.08,"percentChange":-0.24},"rr25":{"current":-1.04,"previous":-2.07,"change":1.03,"percentChange":49.76},"bf25":{"current":2.26,"previous":2.19,"change":0.07,"percentChange":3.2}},{"tenor":"3M","targetExpiry":1798821000036,"availability":"available","unavailableReason":null,"atmIv":{"current":36.69,"previous":36.64,"change":0.05,"percentChange":0.14},"rr25":{"current":-0.93,"previous":-1.22,"change":0.29,"percentChange":23.77},"bf25":{"current":2.27,"previous":2.18,"change":0.09,"percentChange":4.13}},{"tenor":"6M","targetExpiry":1806683400036,"availability":"available","unavailableReason":null,"atmIv":{"current":37.52,"previous":37.61,"change":-0.09,"percentChange":-0.24},"rr25":{"current":-0.52,"previous":-0.65,"change":0.13,"percentChange":20},"bf25":{"current":2.4,"previous":2.33,"change":0.07,"percentChange":3}},{"tenor":"9M","targetExpiry":1814545800036,"availability":"available","unavailableReason":null,"atmIv":{"current":38.28,"previous":38.49,"change":-0.21,"percentChange":-0.55},"rr25":{"current":-0.27,"previous":-0.41,"change":0.14,"percentChange":34.15},"bf25":{"current":2.47,"previous":2.37,"change":0.1,"percentChange":4.22}},{"tenor":"1Y","targetExpiry":1822494600036,"availability":"unavailable","unavailableReason":"The target tenor falls outside the listed-expiry range at one or both snapshots; extrapolated values are suppressed.","atmIv":{"current":null,"previous":null,"change":null,"percentChange":null},"rr25":{"current":null,"previous":null,"change":null,"percentChange":null},"bf25":{"current":null,"previous":null,"change":null,"percentChange":null}}],"realisedVolatility":{"source":"canonical/BTC-USD-INDEX (DERIBIT and OKX indexes)","fallbackObservations":90,"fallbackPolicy":"Missing canonical minutes use the stored Deribit index first, then the stored OKX index; canonical bars always take precedence.","samplingInterval":"1 minute","annualizationBasis":"365 days","windowEnd":"2026-10-02T16:30:00+00:00","spotWindowStart":"2026-10-01T16:30:00+00:00","spotMetric":"spot-index return","spotUnit":"percent","spotMove24hPercent":1.09,"rv24hPercent":null,"rv7dPercent":null,"rv30dPercent":null,"observations":{"24h":1183,"7d":9823,"30d":42943},"coverage":{"24h":{"status":"unavailable","observedReturns":1183,"expectedReturns":1440,"coveragePercent":82.1528,"missingPriceMinutes":255,"missingIntervals":2,"largestMissingRunMinutes":247,"unavailableReason":"24h RV requires at least 98% valid one-minute returns and no price gap over 60 minutes; coverage is 82.1528% with 255 missing price minutes across 2 intervals and a largest gap of 247 minutes."},"7d":{"status":"unavailable","observedReturns":9823,"expectedReturns":10080,"coveragePercent":97.4504,"missingPriceMinutes":255,"missingIntervals":2,"largestMissingRunMinutes":247,"unavailableReason":"7d RV requires at least 97% valid one-minute returns and no price gap over 60 minutes; coverage is 97.4504% with 255 missing price minutes across 2 intervals and a largest gap of 247 minutes."},"30d":{"status":"unavailable","observedReturns":42943,"expectedReturns":43200,"coveragePercent":99.4051,"missingPriceMinutes":255,"missingIntervals":2,"largestMissingRunMinutes":247,"unavailableReason":"30d RV requires at least 99.5% valid one-minute returns and no price gap over 60 minutes; coverage is 99.4051% with 255 missing price minutes across 2 intervals and a largest gap of 247 minutes."}},"coveragePolicy":{"version":"observed-minute-returns-v1","minimumCoveragePercent":null,"minimumCoveragePercentByWindow":{"24h":98,"7d":97,"30d":99.5},"maximumMissingRunMinutes":60,"methodology":"Each RV window qualifies independently. 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":28.62,"oneWeekIvMinus7dRvPoints":null,"oneWeekIvMinus24hRvPoints":null,"oneWeekIvMinus30dRvPoints":null,"oneWeekIvTo7dRvRatio":null,"spreadPercentile":null},"realisedVolatilityUnavailableReason":null}