{"schemaVersion":1,"asset":"BTC","reportDate":"2026-05-14","timestamps":{"currentSnapshotAt":"2026-05-14T23:59:00+00:00","previousSnapshotAt":"2026-05-13T23:59:00+00:00","generatedAt":"2026-07-25T18:42:33+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-05-14","source":"Derivasys proprietary historical SVI surface database","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 interpolated independently at 1W, 2W, 1M, 3M, 6M, 9M and 1Y; headline rankings prioritise 1W, 2W, 1M, 3M, 6M and 1Y.","realisedVolatility":null},"tenors":[{"tenor":"1W","targetExpiry":1779407942279,"availability":"available","unavailableReason":null,"atmIv":{"current":34.36,"previous":36.52,"change":-2.16,"percentChange":-5.91},"rr25":{"current":-3.74,"previous":-3.35,"change":-0.39,"percentChange":-11.64},"bf25":{"current":2,"previous":1.59,"change":0.41,"percentChange":25.79}},{"tenor":"2W","targetExpiry":1780012742279,"availability":"available","unavailableReason":null,"atmIv":{"current":35.83,"previous":37.36,"change":-1.53,"percentChange":-4.1},"rr25":{"current":-4.96,"previous":-4.01,"change":-0.95,"percentChange":-23.69},"bf25":{"current":1.96,"previous":1.89,"change":0.07,"percentChange":3.7}},{"tenor":"1M","targetExpiry":1781395142279,"availability":"available","unavailableReason":null,"atmIv":{"current":37.32,"previous":38.03,"change":-0.71,"percentChange":-1.87},"rr25":{"current":-4.47,"previous":-4.46,"change":-0.01,"percentChange":-0.22},"bf25":{"current":2.03,"previous":2.08,"change":-0.05,"percentChange":-2.4}},{"tenor":"3M","targetExpiry":1786665542279,"availability":"available","unavailableReason":null,"atmIv":{"current":39.33,"previous":39.76,"change":-0.43,"percentChange":-1.08},"rr25":{"current":-4.26,"previous":-4.49,"change":0.23,"percentChange":5.12},"bf25":{"current":2,"previous":2.05,"change":-0.05,"percentChange":-2.44}},{"tenor":"6M","targetExpiry":1794527942279,"availability":"available","unavailableReason":null,"atmIv":{"current":42.16,"previous":42.63,"change":-0.47,"percentChange":-1.1},"rr25":{"current":-4.55,"previous":-4.43,"change":-0.12,"percentChange":-2.71},"bf25":{"current":2.31,"previous":2.35,"change":-0.04,"percentChange":-1.7}},{"tenor":"9M","targetExpiry":1802390342279,"availability":"available","unavailableReason":null,"atmIv":{"current":43.73,"previous":44.14,"change":-0.41,"percentChange":-0.93},"rr25":{"current":-4.48,"previous":-4.22,"change":-0.26,"percentChange":-6.16},"bf25":{"current":2.32,"previous":2.44,"change":-0.12,"percentChange":-4.92}},{"tenor":"1Y","targetExpiry":1810339142279,"availability":"available","unavailableReason":null,"atmIv":{"current":44.5,"previous":44.82,"change":-0.32,"percentChange":-0.71},"rr25":{"current":-4.3,"previous":-4,"change":-0.3,"percentChange":-7.5},"bf25":{"current":2.22,"previous":2.44,"change":-0.22,"percentChange":-9.02}}],"realisedVolatility":null,"realisedVolatilityUnavailableReason":null}