{"schemaVersion":1,"asset":"BTC","reportDate":"2026-09-04","timestamps":{"currentSnapshotAt":"2026-09-04T16:48:00+00:00","previousSnapshotAt":"2026-09-03T16:48:00+00:00","generatedAt":"2026-09-04T16:55:35+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-09-04","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":1789145340059,"availability":"available","unavailableReason":null,"atmIv":{"current":32.01,"previous":37.05,"change":-5.04,"percentChange":-13.6},"rr25":{"current":0.29,"previous":2.11,"change":-1.82,"percentChange":-86.26},"bf25":{"current":1.67,"previous":2.25,"change":-0.58,"percentChange":-25.78}},{"tenor":"2W","targetExpiry":1789750140059,"availability":"available","unavailableReason":null,"atmIv":{"current":35.15,"previous":37.72,"change":-2.57,"percentChange":-6.81},"rr25":{"current":0.64,"previous":1.8,"change":-1.16,"percentChange":-64.44},"bf25":{"current":1.8,"previous":2.2,"change":-0.4,"percentChange":-18.18}},{"tenor":"1M","targetExpiry":1791132540059,"availability":"available","unavailableReason":null,"atmIv":{"current":35.99,"previous":37.42,"change":-1.43,"percentChange":-3.82},"rr25":{"current":0.65,"previous":1.32,"change":-0.67,"percentChange":-50.76},"bf25":{"current":2.09,"previous":2.3,"change":-0.21,"percentChange":-9.13}},{"tenor":"3M","targetExpiry":1796402940059,"availability":"available","unavailableReason":null,"atmIv":{"current":38.34,"previous":39.28,"change":-0.94,"percentChange":-2.39},"rr25":{"current":0.03,"previous":0.21,"change":-0.18,"percentChange":-85.71},"bf25":{"current":2.35,"previous":2.59,"change":-0.24,"percentChange":-9.27}},{"tenor":"6M","targetExpiry":1804265340059,"availability":"available","unavailableReason":null,"atmIv":{"current":39.87,"previous":40.48,"change":-0.61,"percentChange":-1.51},"rr25":{"current":-0.17,"previous":0.05,"change":-0.22,"percentChange":-440},"bf25":{"current":2.53,"previous":2.69,"change":-0.16,"percentChange":-5.95}},{"tenor":"9M","targetExpiry":1812127740059,"availability":"available","unavailableReason":null,"atmIv":{"current":41.15,"previous":41.59,"change":-0.44,"percentChange":-1.06},"rr25":{"current":0.01,"previous":0.21,"change":-0.2,"percentChange":-95.24},"bf25":{"current":2.69,"previous":2.81,"change":-0.12,"percentChange":-4.27}},{"tenor":"1Y","targetExpiry":1820076540059,"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":13,"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":"2026-09-04T16:48:00+00:00","spotMove24hPercent":-1.48,"rv24hPercent":52.23,"rv7dPercent":36.91,"rv30dPercent":37.75,"observations":{"24h":1440,"7d":10080,"30d":43200},"oneWeekAtmIvPercent":32.01,"oneWeekIvMinus7dRvPoints":-4.9,"oneWeekIvMinus24hRvPoints":-20.22,"oneWeekIvMinus30dRvPoints":-5.74,"coverage":null,"coveragePolicy":null,"oneWeekIvTo7dRvRatio":null,"spreadPercentile":null,"spotUnavailableReason":null},"realisedVolatilityUnavailableReason":null}