{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:7NJ67A4CKLFO2CF7BEEJIE7EAH","short_pith_number":"pith:7NJ67A4C","canonical_record":{"source":{"id":"1708.04477","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-15T12:43:59Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"978994251512f1b69e446323df75a131fe6892e8c4ef4b05d033ecca5a2cf006","abstract_canon_sha256":"c98e4aaa0ef154c5eb29c436679737918325ce3c1ecff75830c2ced14e4767fc"},"schema_version":"1.0"},"canonical_sha256":"fb53ef838252caed08bf09089413e401ff1827656316cb44ab41a132f185770a","source":{"kind":"arxiv","id":"1708.04477","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.04477","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"arxiv_version","alias_value":"1708.04477v1","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.04477","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"pith_short_12","alias_value":"7NJ67A4CKLFO","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"7NJ67A4CKLFO2CF7","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"7NJ67A4C","created_at":"2026-05-18T12:31:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:7NJ67A4CKLFO2CF7BEEJIE7EAH","target":"record","payload":{"canonical_record":{"source":{"id":"1708.04477","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-15T12:43:59Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"978994251512f1b69e446323df75a131fe6892e8c4ef4b05d033ecca5a2cf006","abstract_canon_sha256":"c98e4aaa0ef154c5eb29c436679737918325ce3c1ecff75830c2ced14e4767fc"},"schema_version":"1.0"},"canonical_sha256":"fb53ef838252caed08bf09089413e401ff1827656316cb44ab41a132f185770a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:37:59.235144Z","signature_b64":"Rt2GrvcikcypfqufKUgfcwEYct6Aq2K0TFPvSxa0BdeKpDlw6AvSJKlmJy6aYaB/ai8Shpl/dBWMOw4Dj/KlAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fb53ef838252caed08bf09089413e401ff1827656316cb44ab41a132f185770a","last_reissued_at":"2026-05-18T00:37:59.234641Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:37:59.234641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1708.04477","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:37:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mQJ4NMEVIc6j3zkzsB1GZ/ek2YBZfyMxXCXZqc+iqPKIGVAFwkf/yHbexlE7kX3e+FGTE0x3jByGMuX1frvyDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T03:29:02.711922Z"},"content_sha256":"c127694d974d23da1a7190eacd44f16e376f47c63a9ca329229f72842c876f88","schema_version":"1.0","event_id":"sha256:c127694d974d23da1a7190eacd44f16e376f47c63a9ca329229f72842c876f88"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:7NJ67A4CKLFO2CF7BEEJIE7EAH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Methods of Reverberation Mapping. I. Time-lag Determination by Measures of Randomness","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.IM","authors_text":"Doron Chelouche, Francisco Pozo Nu\\~nez, Shay Zucker","submitted_at":"2017-08-15T12:43:59Z","abstract_excerpt":"A class of methods for measuring time delays between astronomical time series is introduced in the context of quasar reverberation mapping, which is based on measures of randomness or complexity of the data. Several distinct statistical estimators are considered that do not rely on polynomial interpolations of the light curves nor on their stochastic modeling, and do not require binning in correlation space. Methods based on von Neumann's mean-square successive-difference estimator are found to be superior to those using other estimators. An optimized von Neumann scheme is formulated, which be"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.04477","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:37:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"IDyIJYAaPYGuayg1ZCkYHxFof4FwRanDPQEzVSW8H+nri0DyR/idLNZML7k6mRS2wSRhyP/+ulP7/UPpgGLlAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-24T03:29:02.712578Z"},"content_sha256":"fc7280afbc7ec0d79d9e25b1571a7053abef731e9fefaa7c1ebeb404c8bc2fb1","schema_version":"1.0","event_id":"sha256:fc7280afbc7ec0d79d9e25b1571a7053abef731e9fefaa7c1ebeb404c8bc2fb1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/bundle.json","state_url":"https://pith.science/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-05-24T03:29:02Z","links":{"resolver":"https://pith.science/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH","bundle":"https://pith.science/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/bundle.json","state":"https://pith.science/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7NJ67A4CKLFO2CF7BEEJIE7EAH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:7NJ67A4CKLFO2CF7BEEJIE7EAH","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"c98e4aaa0ef154c5eb29c436679737918325ce3c1ecff75830c2ced14e4767fc","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-15T12:43:59Z","title_canon_sha256":"978994251512f1b69e446323df75a131fe6892e8c4ef4b05d033ecca5a2cf006"},"schema_version":"1.0","source":{"id":"1708.04477","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1708.04477","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"arxiv_version","alias_value":"1708.04477v1","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1708.04477","created_at":"2026-05-18T00:37:59Z"},{"alias_kind":"pith_short_12","alias_value":"7NJ67A4CKLFO","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_16","alias_value":"7NJ67A4CKLFO2CF7","created_at":"2026-05-18T12:31:05Z"},{"alias_kind":"pith_short_8","alias_value":"7NJ67A4C","created_at":"2026-05-18T12:31:05Z"}],"graph_snapshots":[{"event_id":"sha256:fc7280afbc7ec0d79d9e25b1571a7053abef731e9fefaa7c1ebeb404c8bc2fb1","target":"graph","created_at":"2026-05-18T00:37:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"A class of methods for measuring time delays between astronomical time series is introduced in the context of quasar reverberation mapping, which is based on measures of randomness or complexity of the data. Several distinct statistical estimators are considered that do not rely on polynomial interpolations of the light curves nor on their stochastic modeling, and do not require binning in correlation space. Methods based on von Neumann's mean-square successive-difference estimator are found to be superior to those using other estimators. An optimized von Neumann scheme is formulated, which be","authors_text":"Doron Chelouche, Francisco Pozo Nu\\~nez, Shay Zucker","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-15T12:43:59Z","title":"Methods of Reverberation Mapping. I. Time-lag Determination by Measures of Randomness"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1708.04477","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c127694d974d23da1a7190eacd44f16e376f47c63a9ca329229f72842c876f88","target":"record","created_at":"2026-05-18T00:37:59Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"c98e4aaa0ef154c5eb29c436679737918325ce3c1ecff75830c2ced14e4767fc","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-08-15T12:43:59Z","title_canon_sha256":"978994251512f1b69e446323df75a131fe6892e8c4ef4b05d033ecca5a2cf006"},"schema_version":"1.0","source":{"id":"1708.04477","kind":"arxiv","version":1}},"canonical_sha256":"fb53ef838252caed08bf09089413e401ff1827656316cb44ab41a132f185770a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb53ef838252caed08bf09089413e401ff1827656316cb44ab41a132f185770a","first_computed_at":"2026-05-18T00:37:59.234641Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:37:59.234641Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Rt2GrvcikcypfqufKUgfcwEYct6Aq2K0TFPvSxa0BdeKpDlw6AvSJKlmJy6aYaB/ai8Shpl/dBWMOw4Dj/KlAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:37:59.235144Z","signed_message":"canonical_sha256_bytes"},"source_id":"1708.04477","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c127694d974d23da1a7190eacd44f16e376f47c63a9ca329229f72842c876f88","sha256:fc7280afbc7ec0d79d9e25b1571a7053abef731e9fefaa7c1ebeb404c8bc2fb1"],"state_sha256":"4800a0d2916cadf975cbf39320e35e04ed1c45aeac32669769618e1a5a2a8659"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vGsonFc3UDPwS0w/pQk4ZCUhrJd3zzoTjb4AsvBWMctvCdirVx980J80Ewzux0U3+Dc+kcwNThK6JbBVbsREBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-24T03:29:02.715937Z","bundle_sha256":"7cd58fa07df944489198dc831934d8f4f73c736b11ec79355919806d101800b9"}}