{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:4Y2AQQHKYKUJWI3477MQ7SE5T7","short_pith_number":"pith:4Y2AQQHK","canonical_record":{"source":{"id":"2608.07821","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T23:48:53Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"a49f897152e82055d1d39958c8905e140f34b643beebf38ed479f76c1781220a","abstract_canon_sha256":"ba538ebb44916c0e2917626ba6e96fb13909f3559c910c830adef2d795eb0640"},"schema_version":"1.0"},"canonical_sha256":"e6340840eac2a89b237cffd90fc89d9fc3c1345887d7ca89e6963a19a28f312d","source":{"kind":"arxiv","id":"2608.07821","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.07821","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"arxiv_version","alias_value":"2608.07821v1","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.07821","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_12","alias_value":"4Y2AQQHKYKUJ","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_16","alias_value":"4Y2AQQHKYKUJWI34","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_8","alias_value":"4Y2AQQHK","created_at":"2026-08-11T01:18:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:4Y2AQQHKYKUJWI3477MQ7SE5T7","target":"record","payload":{"canonical_record":{"source":{"id":"2608.07821","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T23:48:53Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"a49f897152e82055d1d39958c8905e140f34b643beebf38ed479f76c1781220a","abstract_canon_sha256":"ba538ebb44916c0e2917626ba6e96fb13909f3559c910c830adef2d795eb0640"},"schema_version":"1.0"},"canonical_sha256":"e6340840eac2a89b237cffd90fc89d9fc3c1345887d7ca89e6963a19a28f312d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-08-11T01:18:32.018912Z","signature_b64":"bdlwNA1ormEPejFN6+oFgKmfHilDOLUdXoFiqCRNgEB9PtntXGnDPf/lCWqSsSqDO2YOSBsGecCBC0Xp0qbcBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e6340840eac2a89b237cffd90fc89d9fc3c1345887d7ca89e6963a19a28f312d","last_reissued_at":"2026-08-11T01:18:32.016267Z","signature_status":"signed_v1","first_computed_at":"2026-08-11T01:18:32.016267Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2608.07821","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":"2026-08-11T01:18:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lrvPzncPbN/2qfmEC6I7yZ50tMeiTBRNdCbpqARFKa8HP/3Dh7BEmwoFb2X1rrU5umW7V8MNEAr/9eiTNRkDDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T21:55:23.570800Z"},"content_sha256":"c23e4a7d7ac17be0d5763b36247e04d0e5e4dd07360e285fbfdf9abbd73511bd","schema_version":"1.0","event_id":"sha256:c23e4a7d7ac17be0d5763b36247e04d0e5e4dd07360e285fbfdf9abbd73511bd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:4Y2AQQHKYKUJWI3477MQ7SE5T7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Insights into the Pulsar Timing Array hypothesis space","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"El Mehdi Zahraoui, Patricio Maturana-Russel, Renate Meyer, Sergei Gulyaev, Willem van Straten","submitted_at":"2026-08-07T23:48:53Z","abstract_excerpt":"We present novel insights into the pulsar-noise model space in pulsar timing array (PTA) experiments. Through a comparative analysis of the same Parkes PTA second data release observations processed with the 2020 and 2023 pipelines, we show that data processing materially changes the distribution of posterior support across competing noise hypotheses and increases sensitivity to weak contributions such as the solar wind. A solar-wind component appears in the highest-posterior hypothesis for ten pulsars under the 2023 pipeline, against four under the 2020 pipeline, while the corresponding mean "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.07821","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/2608.07821/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":"2026-08-11T01:18:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BC1RplbYIXEfpIecb9fT4s1g0NIN/QD+6VHAb2rYYi8umQhcqIkApynNOmjn4rc2SdowBPRV7BFjeHQhee+vDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-11T21:55:23.571419Z"},"content_sha256":"ed79c156c0a8cb52ed7853436c41479e0e0ce31ca23cea0a24a9651e5708693f","schema_version":"1.0","event_id":"sha256:ed79c156c0a8cb52ed7853436c41479e0e0ce31ca23cea0a24a9651e5708693f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/bundle.json","state_url":"https://pith.science/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/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":"2026-08-11T21:55:23Z","links":{"resolver":"https://pith.science/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7","bundle":"https://pith.science/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/bundle.json","state":"https://pith.science/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4Y2AQQHKYKUJWI3477MQ7SE5T7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:4Y2AQQHKYKUJWI3477MQ7SE5T7","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":"ba538ebb44916c0e2917626ba6e96fb13909f3559c910c830adef2d795eb0640","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T23:48:53Z","title_canon_sha256":"a49f897152e82055d1d39958c8905e140f34b643beebf38ed479f76c1781220a"},"schema_version":"1.0","source":{"id":"2608.07821","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2608.07821","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"arxiv_version","alias_value":"2608.07821v1","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2608.07821","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_12","alias_value":"4Y2AQQHKYKUJ","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_16","alias_value":"4Y2AQQHKYKUJWI34","created_at":"2026-08-11T01:18:32Z"},{"alias_kind":"pith_short_8","alias_value":"4Y2AQQHK","created_at":"2026-08-11T01:18:32Z"}],"graph_snapshots":[{"event_id":"sha256:ed79c156c0a8cb52ed7853436c41479e0e0ce31ca23cea0a24a9651e5708693f","target":"graph","created_at":"2026-08-11T01:18:32Z","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/2608.07821/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present novel insights into the pulsar-noise model space in pulsar timing array (PTA) experiments. Through a comparative analysis of the same Parkes PTA second data release observations processed with the 2020 and 2023 pipelines, we show that data processing materially changes the distribution of posterior support across competing noise hypotheses and increases sensitivity to weak contributions such as the solar wind. A solar-wind component appears in the highest-posterior hypothesis for ten pulsars under the 2023 pipeline, against four under the 2020 pipeline, while the corresponding mean ","authors_text":"El Mehdi Zahraoui, Patricio Maturana-Russel, Renate Meyer, Sergei Gulyaev, Willem van Straten","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T23:48:53Z","title":"Insights into the Pulsar Timing Array hypothesis space"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2608.07821","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:c23e4a7d7ac17be0d5763b36247e04d0e5e4dd07360e285fbfdf9abbd73511bd","target":"record","created_at":"2026-08-11T01:18:32Z","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":"ba538ebb44916c0e2917626ba6e96fb13909f3559c910c830adef2d795eb0640","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-08-07T23:48:53Z","title_canon_sha256":"a49f897152e82055d1d39958c8905e140f34b643beebf38ed479f76c1781220a"},"schema_version":"1.0","source":{"id":"2608.07821","kind":"arxiv","version":1}},"canonical_sha256":"e6340840eac2a89b237cffd90fc89d9fc3c1345887d7ca89e6963a19a28f312d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e6340840eac2a89b237cffd90fc89d9fc3c1345887d7ca89e6963a19a28f312d","first_computed_at":"2026-08-11T01:18:32.016267Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-08-11T01:18:32.016267Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bdlwNA1ormEPejFN6+oFgKmfHilDOLUdXoFiqCRNgEB9PtntXGnDPf/lCWqSsSqDO2YOSBsGecCBC0Xp0qbcBA==","signature_status":"signed_v1","signed_at":"2026-08-11T01:18:32.018912Z","signed_message":"canonical_sha256_bytes"},"source_id":"2608.07821","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c23e4a7d7ac17be0d5763b36247e04d0e5e4dd07360e285fbfdf9abbd73511bd","sha256:ed79c156c0a8cb52ed7853436c41479e0e0ce31ca23cea0a24a9651e5708693f"],"state_sha256":"ed39e9e296ced5751235c6cf5260f023334b71385facaf2fbd2383f4d1cffebe"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OUcPpgWwGuqMqMQAgE50KMDKHlgjMsAwv/t5gj0/3entRC6yPdfRqxbATkgLBfPbxhQml39N3OQS91IV0Ps8Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-11T21:55:23.575917Z","bundle_sha256":"81df8947eb1ec0a799f4886c3b66cbfd165739df5611cd7503bdb8af5dcefa3f"}}