{"schemaVersion":1,"asset":"BTC","reportDate":"2026-06-26","timestamps":{"currentSnapshotAt":"2026-06-26T23:59:00+00:00","previousSnapshotAt":"2026-06-25T23:59:00+00:00","generatedAt":"2026-07-25T18:42:38+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-06-26","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":1783123145147,"availability":"available","unavailableReason":null,"atmIv":{"current":44.11,"previous":42.96,"change":1.15,"percentChange":2.68},"rr25":{"current":-9.01,"previous":-8.53,"change":-0.48,"percentChange":-5.63},"bf25":{"current":2.89,"previous":4.63,"change":-1.74,"percentChange":-37.58}},{"tenor":"2W","targetExpiry":1783727945147,"availability":"available","unavailableReason":null,"atmIv":{"current":43.05,"previous":42.86,"change":0.19,"percentChange":0.44},"rr25":{"current":-8.51,"previous":-9.78,"change":1.27,"percentChange":12.99},"bf25":{"current":2.61,"previous":4.16,"change":-1.55,"percentChange":-37.26}},{"tenor":"1M","targetExpiry":1785110345147,"availability":"available","unavailableReason":null,"atmIv":{"current":42.07,"previous":42.72,"change":-0.65,"percentChange":-1.52},"rr25":{"current":-8.73,"previous":-9.28,"change":0.55,"percentChange":5.93},"bf25":{"current":3.11,"previous":3.82,"change":-0.71,"percentChange":-18.59}},{"tenor":"3M","targetExpiry":1790380745147,"availability":"available","unavailableReason":null,"atmIv":{"current":41.93,"previous":42.73,"change":-0.8,"percentChange":-1.87},"rr25":{"current":-8.23,"previous":-8.8,"change":0.57,"percentChange":6.48},"bf25":{"current":2.87,"previous":3.36,"change":-0.49,"percentChange":-14.58}},{"tenor":"6M","targetExpiry":1798243145147,"availability":"available","unavailableReason":null,"atmIv":{"current":43.4,"previous":43.87,"change":-0.47,"percentChange":-1.07},"rr25":{"current":-6.87,"previous":-6.82,"change":-0.05,"percentChange":-0.73},"bf25":{"current":2.97,"previous":3.34,"change":-0.37,"percentChange":-11.08}},{"tenor":"9M","targetExpiry":1806105545147,"availability":"available","unavailableReason":null,"atmIv":{"current":43.97,"previous":44.3,"change":-0.33,"percentChange":-0.74},"rr25":{"current":-5.72,"previous":-5.93,"change":0.21,"percentChange":3.54},"bf25":{"current":2.9,"previous":3.11,"change":-0.21,"percentChange":-6.75}},{"tenor":"1Y","targetExpiry":1814054345147,"availability":"available","unavailableReason":null,"atmIv":{"current":44.36,"previous":44.39,"change":-0.03,"percentChange":-0.07},"rr25":{"current":-5.3,"previous":-5.9,"change":0.6,"percentChange":10.17},"bf25":{"current":2.64,"previous":2.8,"change":-0.16,"percentChange":-5.71}}],"realisedVolatility":null,"realisedVolatilityUnavailableReason":null}