{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:4FGSZ3UQOEKXTIXK7ED5Z4234T","short_pith_number":"pith:4FGSZ3UQ","canonical_record":{"source":{"id":"2312.01328","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-12-03T09:25:43Z","cross_cats_sorted":[],"title_canon_sha256":"70d77b770a5084eb2f956cbbfe25fba1d3f26d61fea79454ea526b69ba65862a","abstract_canon_sha256":"b441a15febf4b8f80bee258e1f50bb1f3da0c94f62b9add8acc8de482587792e"},"schema_version":"1.0"},"canonical_sha256":"e14d2cee90711579a2eaf907dcf35be4ffe8a23249ff6024cc081a8ecc79d53e","source":{"kind":"arxiv","id":"2312.01328","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2312.01328","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"arxiv_version","alias_value":"2312.01328v1","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2312.01328","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_12","alias_value":"4FGSZ3UQOEKX","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_16","alias_value":"4FGSZ3UQOEKXTIXK","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_8","alias_value":"4FGSZ3UQ","created_at":"2026-07-05T07:19:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:4FGSZ3UQOEKXTIXK7ED5Z4234T","target":"record","payload":{"canonical_record":{"source":{"id":"2312.01328","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-12-03T09:25:43Z","cross_cats_sorted":[],"title_canon_sha256":"70d77b770a5084eb2f956cbbfe25fba1d3f26d61fea79454ea526b69ba65862a","abstract_canon_sha256":"b441a15febf4b8f80bee258e1f50bb1f3da0c94f62b9add8acc8de482587792e"},"schema_version":"1.0"},"canonical_sha256":"e14d2cee90711579a2eaf907dcf35be4ffe8a23249ff6024cc081a8ecc79d53e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T07:19:33.406053Z","signature_b64":"sRiIzV/EtV0AHwBM0OJQyX78jjiJZJ255BLlxCIdDWBd0egK/UTAEFwS2A0vHvtRtb9jR+7f2xij/HCO5ryWDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e14d2cee90711579a2eaf907dcf35be4ffe8a23249ff6024cc081a8ecc79d53e","last_reissued_at":"2026-07-05T07:19:33.405450Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T07:19:33.405450Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2312.01328","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":"2026-07-05T07:19:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8folIwBFwWSPDhH+Mz4WD67MCgsVSBwO+Z5XqaA8/tAdyWmcDmFBiW7JNt2Q23b8wu0LYIh+E+dC+7dM+xroAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T18:50:15.636589Z"},"content_sha256":"11d05e94647a5ee1d822609c66cb249656b16f627bc5e075c2a238f19feb84b8","schema_version":"1.0","event_id":"sha256:11d05e94647a5ee1d822609c66cb249656b16f627bc5e075c2a238f19feb84b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:4FGSZ3UQOEKXTIXK7ED5Z4234T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Observational Evidence of a Centi-parsec Supermassive Black Hole Binary Existing in the Nearby Galaxy M81","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Fuguo Xie, Ivan Mart\\'i-Vidal, Lei Huang, Noriyuki Kawaguchi, Roman Gold, Wu Jiang, Ya-Ping Li, Zhen Yan, Zhiqiang Shen","submitted_at":"2023-12-03T09:25:43Z","abstract_excerpt":"Studying a centi-parsec supermassive black hole binary (SMBHB) would allow us to explore a new parameter space in active galactic nuclei, and these objects are also potential sources of gravitational waves. We report evidence that an SMBHB with an orbital period of about 30 yr may be resident in the nearby galactic nucleus M81. This orbital period and the known mass of M81 imply an orbital separation of about 0.02 pc. The jet emanating from the primary black hole showed a short period of jet wobbling at about 16.7 yr, superposing a long-term precession at a timescale of several hundred years. "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2312.01328","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2312.01328/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T07:19:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hCNBp4AzlKpUpOwhf/hRS+aT67nEyBA0C2DPKl2nOJXALiiFfFPrFtYFHVLzwtEr13KTBZUQpZR6FoQniD6jBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T18:50:15.637818Z"},"content_sha256":"0e9e9bf998d667ffd7330b647aa6dee54d343e95c6cbeb544f05ddfb342babac","schema_version":"1.0","event_id":"sha256:0e9e9bf998d667ffd7330b647aa6dee54d343e95c6cbeb544f05ddfb342babac"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/bundle.json","state_url":"https://pith.science/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/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":"2026-08-15T18:50:15Z","links":{"resolver":"https://pith.science/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T","bundle":"https://pith.science/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/bundle.json","state":"https://pith.science/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4FGSZ3UQOEKXTIXK7ED5Z4234T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:4FGSZ3UQOEKXTIXK7ED5Z4234T","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":"b441a15febf4b8f80bee258e1f50bb1f3da0c94f62b9add8acc8de482587792e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-12-03T09:25:43Z","title_canon_sha256":"70d77b770a5084eb2f956cbbfe25fba1d3f26d61fea79454ea526b69ba65862a"},"schema_version":"1.0","source":{"id":"2312.01328","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2312.01328","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"arxiv_version","alias_value":"2312.01328v1","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2312.01328","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_12","alias_value":"4FGSZ3UQOEKX","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_16","alias_value":"4FGSZ3UQOEKXTIXK","created_at":"2026-07-05T07:19:33Z"},{"alias_kind":"pith_short_8","alias_value":"4FGSZ3UQ","created_at":"2026-07-05T07:19:33Z"}],"graph_snapshots":[{"event_id":"sha256:0e9e9bf998d667ffd7330b647aa6dee54d343e95c6cbeb544f05ddfb342babac","target":"graph","created_at":"2026-07-05T07:19:33Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2312.01328/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Studying a centi-parsec supermassive black hole binary (SMBHB) would allow us to explore a new parameter space in active galactic nuclei, and these objects are also potential sources of gravitational waves. We report evidence that an SMBHB with an orbital period of about 30 yr may be resident in the nearby galactic nucleus M81. This orbital period and the known mass of M81 imply an orbital separation of about 0.02 pc. The jet emanating from the primary black hole showed a short period of jet wobbling at about 16.7 yr, superposing a long-term precession at a timescale of several hundred years. ","authors_text":"Fuguo Xie, Ivan Mart\\'i-Vidal, Lei Huang, Noriyuki Kawaguchi, Roman Gold, Wu Jiang, Ya-Ping Li, Zhen Yan, Zhiqiang Shen","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-12-03T09:25:43Z","title":"Observational Evidence of a Centi-parsec Supermassive Black Hole Binary Existing in the Nearby Galaxy M81"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2312.01328","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":"sha256:11d05e94647a5ee1d822609c66cb249656b16f627bc5e075c2a238f19feb84b8","target":"record","created_at":"2026-07-05T07:19:33Z","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":"b441a15febf4b8f80bee258e1f50bb1f3da0c94f62b9add8acc8de482587792e","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-nc-sa/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2023-12-03T09:25:43Z","title_canon_sha256":"70d77b770a5084eb2f956cbbfe25fba1d3f26d61fea79454ea526b69ba65862a"},"schema_version":"1.0","source":{"id":"2312.01328","kind":"arxiv","version":1}},"canonical_sha256":"e14d2cee90711579a2eaf907dcf35be4ffe8a23249ff6024cc081a8ecc79d53e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e14d2cee90711579a2eaf907dcf35be4ffe8a23249ff6024cc081a8ecc79d53e","first_computed_at":"2026-07-05T07:19:33.405450Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T07:19:33.405450Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"sRiIzV/EtV0AHwBM0OJQyX78jjiJZJ255BLlxCIdDWBd0egK/UTAEFwS2A0vHvtRtb9jR+7f2xij/HCO5ryWDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T07:19:33.406053Z","signed_message":"canonical_sha256_bytes"},"source_id":"2312.01328","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:11d05e94647a5ee1d822609c66cb249656b16f627bc5e075c2a238f19feb84b8","sha256:0e9e9bf998d667ffd7330b647aa6dee54d343e95c6cbeb544f05ddfb342babac"],"state_sha256":"d2f541661cc5cf10c8c48b878059bf967115e18abbef09ca161b880ea117a3a3"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PJrM7wPOxbZha2jX1WANRtqNoA1WlEVPe+BUTur0pMYDue48vSPC7ohq0dde7qjTKaqqdjmncQLOlDdLeAOnCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T18:50:15.643914Z","bundle_sha256":"8545db62d5da9bcadfa62c7bcdd4a331d1428b6e64a0dfe862a42dcdeb44e2fa"}}