{"schemaVersion":1,"asset":"BTC","reportDate":"2026-06-11","timestamps":{"currentSnapshotAt":"2026-06-11T23:59:00+00:00","previousSnapshotAt":"2026-06-10T23:59:00+00:00","generatedAt":"2026-07-25T18:42:36+00:00"},"comparison":{"status":"available","note":null},"provenance":{"reportArtifact":"published daily report","sourceReport":"BTC","sourceReportHref":"/reports/2026-06-11","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":1781827143943,"availability":"available","unavailableReason":null,"atmIv":{"current":40.82,"previous":47.11,"change":-6.29,"percentChange":-13.35},"rr25":{"current":-3.73,"previous":-7.72,"change":3.99,"percentChange":51.68},"bf25":{"current":2.23,"previous":3.02,"change":-0.79,"percentChange":-26.16}},{"tenor":"2W","targetExpiry":1782431943943,"availability":"available","unavailableReason":null,"atmIv":{"current":41.52,"previous":46,"change":-4.48,"percentChange":-9.74},"rr25":{"current":-5,"previous":-7.87,"change":2.87,"percentChange":36.47},"bf25":{"current":2.62,"previous":3.21,"change":-0.59,"percentChange":-18.38}},{"tenor":"1M","targetExpiry":1783814343943,"availability":"available","unavailableReason":null,"atmIv":{"current":41.18,"previous":44.29,"change":-3.11,"percentChange":-7.02},"rr25":{"current":-5.82,"previous":-8.4,"change":2.58,"percentChange":30.71},"bf25":{"current":2.34,"previous":2.88,"change":-0.54,"percentChange":-18.75}},{"tenor":"3M","targetExpiry":1789084743943,"availability":"available","unavailableReason":null,"atmIv":{"current":41.51,"previous":43.42,"change":-1.91,"percentChange":-4.4},"rr25":{"current":-5.96,"previous":-7.35,"change":1.39,"percentChange":18.91},"bf25":{"current":2.54,"previous":2.73,"change":-0.19,"percentChange":-6.96}},{"tenor":"6M","targetExpiry":1796947143943,"availability":"available","unavailableReason":null,"atmIv":{"current":43.38,"previous":44.4,"change":-1.02,"percentChange":-2.3},"rr25":{"current":-4.92,"previous":-5.76,"change":0.84,"percentChange":14.58},"bf25":{"current":2.76,"previous":2.92,"change":-0.16,"percentChange":-5.48}},{"tenor":"9M","targetExpiry":1804809543943,"availability":"available","unavailableReason":null,"atmIv":{"current":44.11,"previous":44.74,"change":-0.63,"percentChange":-1.41},"rr25":{"current":-4.08,"previous":-4.57,"change":0.49,"percentChange":10.72},"bf25":{"current":2.94,"previous":3.05,"change":-0.11,"percentChange":-3.61}},{"tenor":"1Y","targetExpiry":1812758343943,"availability":"available","unavailableReason":null,"atmIv":{"current":44.47,"previous":44.89,"change":-0.42,"percentChange":-0.94},"rr25":{"current":-3.59,"previous":-3.86,"change":0.27,"percentChange":6.99},"bf25":{"current":3.03,"previous":3.14,"change":-0.11,"percentChange":-3.5}}],"realisedVolatility":null,"realisedVolatilityUnavailableReason":null}