{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:3OWTHY7N43BOAU3P4ARFACZABD","short_pith_number":"pith:3OWTHY7N","canonical_record":{"source":{"id":"2412.01214","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-12-02T07:35:14Z","cross_cats_sorted":[],"title_canon_sha256":"523ff0ddc414c5e78eaee691d48239680254664dfef51ee781307cd04c95bce1","abstract_canon_sha256":"f8ff3f990a45f841f0bfe33a62cc1da1daf56655ae9c5d87d774227ae7177ee0"},"schema_version":"1.0"},"canonical_sha256":"dbad33e3ede6c2e0536fe022500b2008dbafb8a37d72be7698e442ad943fde16","source":{"kind":"arxiv","id":"2412.01214","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.01214","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"arxiv_version","alias_value":"2412.01214v1","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.01214","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_12","alias_value":"3OWTHY7N43BO","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_16","alias_value":"3OWTHY7N43BOAU3P","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_8","alias_value":"3OWTHY7N","created_at":"2026-07-05T09:42:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:3OWTHY7N43BOAU3P4ARFACZABD","target":"record","payload":{"canonical_record":{"source":{"id":"2412.01214","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-12-02T07:35:14Z","cross_cats_sorted":[],"title_canon_sha256":"523ff0ddc414c5e78eaee691d48239680254664dfef51ee781307cd04c95bce1","abstract_canon_sha256":"f8ff3f990a45f841f0bfe33a62cc1da1daf56655ae9c5d87d774227ae7177ee0"},"schema_version":"1.0"},"canonical_sha256":"dbad33e3ede6c2e0536fe022500b2008dbafb8a37d72be7698e442ad943fde16","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:42:56.122968Z","signature_b64":"jiiRCF0TXRgjbVLxoP5RmqEbQTKn/13nY/rMq0IiRkX4+16wIe369odHc/qq2tDQaZxZwtQpk9ZyyRJ6OQDfAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dbad33e3ede6c2e0536fe022500b2008dbafb8a37d72be7698e442ad943fde16","last_reissued_at":"2026-07-05T09:42:56.122475Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:42:56.122475Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2412.01214","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":"2026-07-05T09:42:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/j6uDMZamTSSaytWH9YEBDpyMcC9LccwudRu23QEFvrpb8K4Z5hy1tcRZpyl6M50KRFq0sFBm0iGMxFG72vnBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T15:03:41.943518Z"},"content_sha256":"fc255827b554b66d524ac16331f98872d42388e4f63f16acbab5d8118bb6839d","schema_version":"1.0","event_id":"sha256:fc255827b554b66d524ac16331f98872d42388e4f63f16acbab5d8118bb6839d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:3OWTHY7N43BOAU3P4ARFACZABD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The MeerKAT Pulsar Timing Array: Maps of the gravitational-wave sky with the 4.5 year data release","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Aditya Parthasarathy, Andrew D. Cameron, Atharva D. Kulkarni, Daniel J. Reardon, David J. Champion, Eric Thrane, Federico Abbate, Jaikhomba Singha, Kathrin Grunthal, Marisa Geyer, Matthew T. Miles, Michael J. Keith, Michael Kramer, Paul D. Lasky, Pratyasha Gitika, Rowina S. Nathan, Ryan M. Shannon, Sarah Buchner, Vivek Venkatraman Krishnan","submitted_at":"2024-12-02T07:35:14Z","abstract_excerpt":"In an accompanying publication, the MeerKAT Pulsar Timing Array (MPTA) collaboration reports tentative evidence for the presence of a stochastic gravitational-wave background, following observations of similar signals from the European and Indian Pulsar Timing Arrays, NANOGrav, the Parkes Pulsar Timing Array and the Chinese Pulsar Timing Array. If such a gravitational-wave background signal originates from a population of inspiraling supermassive black-hole binaries, the signal may be anisotropically distributed on the sky. In this Letter we evaluate the anisotropy of the MPTA signal using a s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.01214","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/2412.01214/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":"2026-07-05T09:42:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0NPhSGg1vAfhmnHvs86TjlXEU2zfbZBeJJvqoh7DGiHNB96uZ8ddPzR4yoUxg0kwtP5BfqgfQKYVlK1MHp57Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T15:03:41.943891Z"},"content_sha256":"10d23cd5e8681d8a01cdfd55a471a753c5f1c1ecdf06f6b578605896a0911f78","schema_version":"1.0","event_id":"sha256:10d23cd5e8681d8a01cdfd55a471a753c5f1c1ecdf06f6b578605896a0911f78"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3OWTHY7N43BOAU3P4ARFACZABD/bundle.json","state_url":"https://pith.science/pith/3OWTHY7N43BOAU3P4ARFACZABD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3OWTHY7N43BOAU3P4ARFACZABD/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":"2026-08-06T15:03:41Z","links":{"resolver":"https://pith.science/pith/3OWTHY7N43BOAU3P4ARFACZABD","bundle":"https://pith.science/pith/3OWTHY7N43BOAU3P4ARFACZABD/bundle.json","state":"https://pith.science/pith/3OWTHY7N43BOAU3P4ARFACZABD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3OWTHY7N43BOAU3P4ARFACZABD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:3OWTHY7N43BOAU3P4ARFACZABD","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":"f8ff3f990a45f841f0bfe33a62cc1da1daf56655ae9c5d87d774227ae7177ee0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-12-02T07:35:14Z","title_canon_sha256":"523ff0ddc414c5e78eaee691d48239680254664dfef51ee781307cd04c95bce1"},"schema_version":"1.0","source":{"id":"2412.01214","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2412.01214","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"arxiv_version","alias_value":"2412.01214v1","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2412.01214","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_12","alias_value":"3OWTHY7N43BO","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_16","alias_value":"3OWTHY7N43BOAU3P","created_at":"2026-07-05T09:42:56Z"},{"alias_kind":"pith_short_8","alias_value":"3OWTHY7N","created_at":"2026-07-05T09:42:56Z"}],"graph_snapshots":[{"event_id":"sha256:10d23cd5e8681d8a01cdfd55a471a753c5f1c1ecdf06f6b578605896a0911f78","target":"graph","created_at":"2026-07-05T09:42:56Z","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/2412.01214/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In an accompanying publication, the MeerKAT Pulsar Timing Array (MPTA) collaboration reports tentative evidence for the presence of a stochastic gravitational-wave background, following observations of similar signals from the European and Indian Pulsar Timing Arrays, NANOGrav, the Parkes Pulsar Timing Array and the Chinese Pulsar Timing Array. If such a gravitational-wave background signal originates from a population of inspiraling supermassive black-hole binaries, the signal may be anisotropically distributed on the sky. In this Letter we evaluate the anisotropy of the MPTA signal using a s","authors_text":"Aditya Parthasarathy, Andrew D. Cameron, Atharva D. Kulkarni, Daniel J. Reardon, David J. Champion, Eric Thrane, Federico Abbate, Jaikhomba Singha, Kathrin Grunthal, Marisa Geyer, Matthew T. Miles, Michael J. Keith, Michael Kramer, Paul D. Lasky, Pratyasha Gitika, Rowina S. Nathan, Ryan M. Shannon, Sarah Buchner, Vivek Venkatraman Krishnan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-12-02T07:35:14Z","title":"The MeerKAT Pulsar Timing Array: Maps of the gravitational-wave sky with the 4.5 year data release"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2412.01214","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:fc255827b554b66d524ac16331f98872d42388e4f63f16acbab5d8118bb6839d","target":"record","created_at":"2026-07-05T09:42:56Z","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":"f8ff3f990a45f841f0bfe33a62cc1da1daf56655ae9c5d87d774227ae7177ee0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2024-12-02T07:35:14Z","title_canon_sha256":"523ff0ddc414c5e78eaee691d48239680254664dfef51ee781307cd04c95bce1"},"schema_version":"1.0","source":{"id":"2412.01214","kind":"arxiv","version":1}},"canonical_sha256":"dbad33e3ede6c2e0536fe022500b2008dbafb8a37d72be7698e442ad943fde16","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dbad33e3ede6c2e0536fe022500b2008dbafb8a37d72be7698e442ad943fde16","first_computed_at":"2026-07-05T09:42:56.122475Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:42:56.122475Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"jiiRCF0TXRgjbVLxoP5RmqEbQTKn/13nY/rMq0IiRkX4+16wIe369odHc/qq2tDQaZxZwtQpk9ZyyRJ6OQDfAw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:42:56.122968Z","signed_message":"canonical_sha256_bytes"},"source_id":"2412.01214","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:fc255827b554b66d524ac16331f98872d42388e4f63f16acbab5d8118bb6839d","sha256:10d23cd5e8681d8a01cdfd55a471a753c5f1c1ecdf06f6b578605896a0911f78"],"state_sha256":"0c8964c1e3b197986cd0fa030403950a8a2d4fc90130d60b911606fcc0f8ed6b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H2AaRmLEzBkyIUQ4d/uLRa23d/GIyc4gT7brt5eBXBq5LhxKHw8b5EPZwO9QZAKRQz9aj2OxWy6ffo5Mi3GNCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T15:03:41.946775Z","bundle_sha256":"05a76bdaf8018742c4ad5ad874a5f112f20f7b28e77e67c2c1e3a15f55749cc2"}}