{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:XNWRF2BYTMO22Y3TJJNQI6MYLZ","short_pith_number":"pith:XNWRF2BY","canonical_record":{"source":{"id":"2603.05722","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-03-05T22:25:14Z","cross_cats_sorted":[],"title_canon_sha256":"1dad377043a113a654f72d8ff365e79e76588cdfc7fa88e84395acb51ec0c2ca","abstract_canon_sha256":"87ebfbe65c73b30420d5850e9cd7a0c2f0597f183b2cf2b55429f00ce2346407"},"schema_version":"1.0"},"canonical_sha256":"bb6d12e8389b1dad63734a5b0479985e70fdf1e029297f8f39921cc8475bbb8e","source":{"kind":"arxiv","id":"2603.05722","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2603.05722","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"arxiv_version","alias_value":"2603.05722v2","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.05722","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_12","alias_value":"XNWRF2BYTMO2","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_16","alias_value":"XNWRF2BYTMO22Y3T","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_8","alias_value":"XNWRF2BY","created_at":"2026-07-27T00:19:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:XNWRF2BYTMO22Y3TJJNQI6MYLZ","target":"record","payload":{"canonical_record":{"source":{"id":"2603.05722","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-03-05T22:25:14Z","cross_cats_sorted":[],"title_canon_sha256":"1dad377043a113a654f72d8ff365e79e76588cdfc7fa88e84395acb51ec0c2ca","abstract_canon_sha256":"87ebfbe65c73b30420d5850e9cd7a0c2f0597f183b2cf2b55429f00ce2346407"},"schema_version":"1.0"},"canonical_sha256":"bb6d12e8389b1dad63734a5b0479985e70fdf1e029297f8f39921cc8475bbb8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-27T00:19:47.490930Z","signature_b64":"70d+FmX7HWn3AdEPaHrUFbdLgCJndboNDpOd3ZxJUmhdG92QG8E1ybuBVTcMibg+F/OsjWq9pgjEWYSyc+nnBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bb6d12e8389b1dad63734a5b0479985e70fdf1e029297f8f39921cc8475bbb8e","last_reissued_at":"2026-07-27T00:19:47.489979Z","signature_status":"signed_v1","first_computed_at":"2026-07-27T00:19:47.489979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2603.05722","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-27T00:19:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uM4XgIxSmgovTOT2J4u4ljU/18sjwc4tX0zPY7ZQK2VjSDvkodAH2hFG4RPoOY5p4S7qip1cjkE9TUDekjlqCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T08:18:21.678009Z"},"content_sha256":"4dd6b9b9faf3908a0e5557276094b641951ff5d8184d328699063e0f769cae83","schema_version":"1.0","event_id":"sha256:4dd6b9b9faf3908a0e5557276094b641951ff5d8184d328699063e0f769cae83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:XNWRF2BYTMO22Y3TJJNQI6MYLZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fingerprints of Individual Supermassive Black Hole Binaries in Pulsar Timing Arrays","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Bjorn Larsen, Chiara M. F. Mingarelli, Ellis Eisenberg, Forrest Hutchison, Qinyuan Zheng","submitted_at":"2026-03-05T22:25:14Z","abstract_excerpt":"With evidence for a nanoHertz gravitational-wave background now established by Pulsar Timing Arrays, the search focuses on identifying individual supermassive black hole binaries. We show that these binaries produce a distinct spatial correlation pattern across the array, acting as a deterministic analogue to the stochastic Hellings \\& Downs curve. We derive a closed analytic expression for this single-source overlap reduction function, $\\Upsilon_{ab}$, factorizing the signal into a source-dependent amplitude and a purely geometric fingerprint. Using simulated datasets, we demonstrate that thi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.05722","kind":"arxiv","version":2},"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/2603.05722/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":"2026-07-27T00:19:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Awd5iew8M1lqjfoJyduvTAVhMldDLZKxPdMQg1LeC1CQDEZpILUsuCgc6x7SdRxxPqBKZSyntdn+GTlqnJXVDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T08:18:21.679091Z"},"content_sha256":"51271f5b54725376ece626e778284d7e7b6da3c60a150fbe3ad704ee8e006726","schema_version":"1.0","event_id":"sha256:51271f5b54725376ece626e778284d7e7b6da3c60a150fbe3ad704ee8e006726"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/bundle.json","state_url":"https://pith.science/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/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":"2026-08-06T08:18:21Z","links":{"resolver":"https://pith.science/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ","bundle":"https://pith.science/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/bundle.json","state":"https://pith.science/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XNWRF2BYTMO22Y3TJJNQI6MYLZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:XNWRF2BYTMO22Y3TJJNQI6MYLZ","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":"87ebfbe65c73b30420d5850e9cd7a0c2f0597f183b2cf2b55429f00ce2346407","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-03-05T22:25:14Z","title_canon_sha256":"1dad377043a113a654f72d8ff365e79e76588cdfc7fa88e84395acb51ec0c2ca"},"schema_version":"1.0","source":{"id":"2603.05722","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2603.05722","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"arxiv_version","alias_value":"2603.05722v2","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2603.05722","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_12","alias_value":"XNWRF2BYTMO2","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_16","alias_value":"XNWRF2BYTMO22Y3T","created_at":"2026-07-27T00:19:47Z"},{"alias_kind":"pith_short_8","alias_value":"XNWRF2BY","created_at":"2026-07-27T00:19:47Z"}],"graph_snapshots":[{"event_id":"sha256:51271f5b54725376ece626e778284d7e7b6da3c60a150fbe3ad704ee8e006726","target":"graph","created_at":"2026-07-27T00:19:47Z","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/2603.05722/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"With evidence for a nanoHertz gravitational-wave background now established by Pulsar Timing Arrays, the search focuses on identifying individual supermassive black hole binaries. We show that these binaries produce a distinct spatial correlation pattern across the array, acting as a deterministic analogue to the stochastic Hellings \\& Downs curve. We derive a closed analytic expression for this single-source overlap reduction function, $\\Upsilon_{ab}$, factorizing the signal into a source-dependent amplitude and a purely geometric fingerprint. Using simulated datasets, we demonstrate that thi","authors_text":"Bjorn Larsen, Chiara M. F. Mingarelli, Ellis Eisenberg, Forrest Hutchison, Qinyuan Zheng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-03-05T22:25:14Z","title":"Fingerprints of Individual Supermassive Black Hole Binaries in Pulsar Timing Arrays"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2603.05722","kind":"arxiv","version":2},"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":"sha256:4dd6b9b9faf3908a0e5557276094b641951ff5d8184d328699063e0f769cae83","target":"record","created_at":"2026-07-27T00:19:47Z","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":"87ebfbe65c73b30420d5850e9cd7a0c2f0597f183b2cf2b55429f00ce2346407","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-03-05T22:25:14Z","title_canon_sha256":"1dad377043a113a654f72d8ff365e79e76588cdfc7fa88e84395acb51ec0c2ca"},"schema_version":"1.0","source":{"id":"2603.05722","kind":"arxiv","version":2}},"canonical_sha256":"bb6d12e8389b1dad63734a5b0479985e70fdf1e029297f8f39921cc8475bbb8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bb6d12e8389b1dad63734a5b0479985e70fdf1e029297f8f39921cc8475bbb8e","first_computed_at":"2026-07-27T00:19:47.489979Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-27T00:19:47.489979Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"70d+FmX7HWn3AdEPaHrUFbdLgCJndboNDpOd3ZxJUmhdG92QG8E1ybuBVTcMibg+F/OsjWq9pgjEWYSyc+nnBA==","signature_status":"signed_v1","signed_at":"2026-07-27T00:19:47.490930Z","signed_message":"canonical_sha256_bytes"},"source_id":"2603.05722","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4dd6b9b9faf3908a0e5557276094b641951ff5d8184d328699063e0f769cae83","sha256:51271f5b54725376ece626e778284d7e7b6da3c60a150fbe3ad704ee8e006726"],"state_sha256":"29ed7670d2dc298bf1d2bf4e23a0456bbaa1958089dcb7d9ed6d6f1ae237cb95"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EFkd1QSzQOrkNTfdI9Mie3pY24lHaFcyjkcD1JeNhw3B4nNLQss2I402YkrFE4wTFe7KRvotzEoIz+QUlgcTDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T08:18:21.686845Z","bundle_sha256":"06588bdf0eb9dbd026c9c8d55179c6b67a82d5e4c2d3fc4aacf6e6d969500dd4"}}