{"schemaVersion":1,"asset":"BTC","reportDate":"2026-07-15","timestamps":{"currentSnapshotAt":"2026-07-15T23:59:00+00:00","previousSnapshotAt":"2026-07-14T23:59:00+00:00","generatedAt":"2026-07-25T18:42:40+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-07-15","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":1784764743549,"availability":"available","unavailableReason":null,"atmIv":{"current":31.18,"previous":33.89,"change":-2.71,"percentChange":-8},"rr25":{"current":-2.25,"previous":-3,"change":0.75,"percentChange":25},"bf25":{"current":1.61,"previous":1.68,"change":-0.07,"percentChange":-4.17}},{"tenor":"2W","targetExpiry":1785369543549,"availability":"available","unavailableReason":null,"atmIv":{"current":32.69,"previous":33.75,"change":-1.06,"percentChange":-3.14},"rr25":{"current":-3.32,"previous":-3.26,"change":-0.06,"percentChange":-1.84},"bf25":{"current":1.72,"previous":1.64,"change":0.08,"percentChange":4.88}},{"tenor":"1M","targetExpiry":1786751943549,"availability":"available","unavailableReason":null,"atmIv":{"current":33.6,"previous":34.16,"change":-0.56,"percentChange":-1.64},"rr25":{"current":-4.71,"previous":-5.08,"change":0.37,"percentChange":7.28},"bf25":{"current":2.21,"previous":2.14,"change":0.07,"percentChange":3.27}},{"tenor":"3M","targetExpiry":1792022343549,"availability":"available","unavailableReason":null,"atmIv":{"current":37.31,"previous":37.56,"change":-0.25,"percentChange":-0.67},"rr25":{"current":-5.47,"previous":-5.95,"change":0.48,"percentChange":8.07},"bf25":{"current":2.63,"previous":2.57,"change":0.06,"percentChange":2.33}},{"tenor":"6M","targetExpiry":1799884743549,"availability":"available","unavailableReason":null,"atmIv":{"current":40.31,"previous":40.54,"change":-0.23,"percentChange":-0.57},"rr25":{"current":-5.42,"previous":-5.55,"change":0.13,"percentChange":2.34},"bf25":{"current":2.76,"previous":2.65,"change":0.11,"percentChange":4.15}},{"tenor":"9M","targetExpiry":1807747143549,"availability":"available","unavailableReason":null,"atmIv":{"current":41.57,"previous":41.75,"change":-0.18,"percentChange":-0.43},"rr25":{"current":-5.21,"previous":-5.17,"change":-0.04,"percentChange":-0.77},"bf25":{"current":2.71,"previous":2.63,"change":0.08,"percentChange":3.04}},{"tenor":"1Y","targetExpiry":1815695943549,"availability":"available","unavailableReason":null,"atmIv":{"current":42.53,"previous":42.58,"change":-0.05,"percentChange":-0.12},"rr25":{"current":-5.02,"previous":-4.96,"change":-0.06,"percentChange":-1.21},"bf25":{"current":2.64,"previous":2.62,"change":0.02,"percentChange":0.76}}],"realisedVolatility":null,"realisedVolatilityUnavailableReason":null}