{"schemaVersion":1,"asset":"BTC","reportDate":"2026-09-29","timestamps":{"currentSnapshotAt":"2026-09-29T21:59:00+00:00","previousSnapshotAt":"2026-09-28T21:59:00+00:00","generatedAt":"2026-09-29T22:00:38+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-09-29","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":1791323940168,"availability":"available","unavailableReason":null,"atmIv":{"current":32.15,"previous":33.47,"change":-1.32,"percentChange":-3.94},"rr25":{"current":-0.24,"previous":-1.31,"change":1.07,"percentChange":81.68},"bf25":{"current":1.52,"previous":1.51,"change":0.01,"percentChange":0.66}},{"tenor":"2W","targetExpiry":1791928740168,"availability":"available","unavailableReason":null,"atmIv":{"current":32.66,"previous":33.71,"change":-1.05,"percentChange":-3.11},"rr25":{"current":-0.32,"previous":-1.31,"change":0.99,"percentChange":75.57},"bf25":{"current":1.5,"previous":1.49,"change":0.01,"percentChange":0.67}},{"tenor":"1M","targetExpiry":1793311140168,"availability":"available","unavailableReason":null,"atmIv":{"current":33.94,"previous":34.69,"change":-0.75,"percentChange":-2.16},"rr25":{"current":-0.63,"previous":-0.84,"change":0.21,"percentChange":25},"bf25":{"current":1.85,"previous":1.7,"change":0.15,"percentChange":8.82}},{"tenor":"3M","targetExpiry":1798581540168,"availability":"available","unavailableReason":null,"atmIv":{"current":36.9,"previous":37.21,"change":-0.31,"percentChange":-0.83},"rr25":{"current":-0.63,"previous":-0.73,"change":0.1,"percentChange":13.7},"bf25":{"current":1.97,"previous":1.93,"change":0.04,"percentChange":2.07}},{"tenor":"6M","targetExpiry":1806443940168,"availability":"available","unavailableReason":null,"atmIv":{"current":37.83,"previous":38.1,"change":-0.27,"percentChange":-0.71},"rr25":{"current":-0.35,"previous":-0.41,"change":0.06,"percentChange":14.63},"bf25":{"current":2.19,"previous":2.05,"change":0.14,"percentChange":6.83}},{"tenor":"9M","targetExpiry":1814306340168,"availability":"available","unavailableReason":null,"atmIv":{"current":38.59,"previous":38.74,"change":-0.15,"percentChange":-0.39},"rr25":{"current":-0.24,"previous":-0.3,"change":0.06,"percentChange":20},"bf25":{"current":2.24,"previous":2.28,"change":-0.04,"percentChange":-1.75}},{"tenor":"1Y","targetExpiry":1822255140168,"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":88,"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":"2026-09-29T21:59:00+00:00","spotWindowStart":"2026-09-28T21:59:00+00:00","spotMetric":"spot-index return","spotUnit":"percent","spotMove24hPercent":0.35,"rv24hPercent":32,"rv7dPercent":32.73,"rv30dPercent":35.28,"observations":{"24h":1440,"7d":10080,"30d":43200},"coverage":{"24h":{"status":"complete","observedReturns":1440,"expectedReturns":1440,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null},"7d":{"status":"complete","observedReturns":10080,"expectedReturns":10080,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null},"30d":{"status":"complete","observedReturns":43200,"expectedReturns":43200,"coveragePercent":100,"missingPriceMinutes":0,"missingIntervals":0,"largestMissingRunMinutes":0,"unavailableReason":null}},"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":32.15,"oneWeekIvMinus7dRvPoints":-0.58,"oneWeekIvMinus24hRvPoints":0.15,"oneWeekIvMinus30dRvPoints":-3.13,"oneWeekIvTo7dRvRatio":null,"spreadPercentile":null},"realisedVolatilityUnavailableReason":null}