{"schemaVersion":1,"asset":"BTC","reportDate":"2026-05-05","timestamps":{"currentSnapshotAt":"2026-05-05T23:59:00+00:00","previousSnapshotAt":"2026-05-04T23:59:00+00:00","generatedAt":"2026-07-25T18:42:32+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-05-05","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":1778630343942,"availability":"available","unavailableReason":null,"atmIv":{"current":38.67,"previous":38.47,"change":0.2,"percentChange":0.52},"rr25":{"current":-1.53,"previous":-2.45,"change":0.92,"percentChange":37.55},"bf25":{"current":1.89,"previous":1.75,"change":0.14,"percentChange":8}},{"tenor":"2W","targetExpiry":1779235143942,"availability":"available","unavailableReason":null,"atmIv":{"current":38.47,"previous":38.45,"change":0.02,"percentChange":0.05},"rr25":{"current":-2.5,"previous":-3.24,"change":0.74,"percentChange":22.84},"bf25":{"current":1.9,"previous":1.78,"change":0.12,"percentChange":6.74}},{"tenor":"1M","targetExpiry":1780617543942,"availability":"available","unavailableReason":null,"atmIv":{"current":38.46,"previous":39.24,"change":-0.78,"percentChange":-1.99},"rr25":{"current":-3.27,"previous":-3.78,"change":0.51,"percentChange":13.49},"bf25":{"current":2.01,"previous":1.96,"change":0.05,"percentChange":2.55}},{"tenor":"3M","targetExpiry":1785887943942,"availability":"available","unavailableReason":null,"atmIv":{"current":39.77,"previous":40.9,"change":-1.13,"percentChange":-2.76},"rr25":{"current":-4.23,"previous":-5.03,"change":0.8,"percentChange":15.9},"bf25":{"current":2.05,"previous":2.09,"change":-0.04,"percentChange":-1.91}},{"tenor":"6M","targetExpiry":1793750343942,"availability":"available","unavailableReason":null,"atmIv":{"current":42.51,"previous":43.55,"change":-1.04,"percentChange":-2.39},"rr25":{"current":-4.3,"previous":-4.93,"change":0.63,"percentChange":12.78},"bf25":{"current":2.18,"previous":2.21,"change":-0.03,"percentChange":-1.36}},{"tenor":"9M","targetExpiry":1801612743942,"availability":"available","unavailableReason":null,"atmIv":{"current":44.03,"previous":44.74,"change":-0.71,"percentChange":-1.59},"rr25":{"current":-4.2,"previous":-4.7,"change":0.5,"percentChange":10.64},"bf25":{"current":2.24,"previous":2.22,"change":0.02,"percentChange":0.9}},{"tenor":"1Y","targetExpiry":1809561543942,"availability":"available","unavailableReason":null,"atmIv":{"current":44.73,"previous":45.15,"change":-0.42,"percentChange":-0.93},"rr25":{"current":-4.12,"previous":-4.56,"change":0.44,"percentChange":9.65},"bf25":{"current":2.22,"previous":2.14,"change":0.08,"percentChange":3.74}}],"realisedVolatility":null,"realisedVolatilityUnavailableReason":null}