{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:IYKLHQ2MKCNIY3YXNRHWAUC7TS","short_pith_number":"pith:IYKLHQ2M","canonical_record":{"source":{"id":"2406.04409","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-06T18:00:15Z","cross_cats_sorted":["astro-ph.HE","gr-qc"],"title_canon_sha256":"7873ff51f75ad7c10e598c95ee991e5f6c19986aec4552f24f692aec921cc3de","abstract_canon_sha256":"2323ed6292173e41c95d8a93a670637cdb1b623915e8428d73806bd4c05e5f71"},"schema_version":"1.0"},"canonical_sha256":"4614b3c34c509a8c6f176c4f60505f9caae03e02c84e00e040125783b79505f2","source":{"kind":"arxiv","id":"2406.04409","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.04409","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"arxiv_version","alias_value":"2406.04409v2","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.04409","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_12","alias_value":"IYKLHQ2MKCNI","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_16","alias_value":"IYKLHQ2MKCNIY3YX","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_8","alias_value":"IYKLHQ2M","created_at":"2026-07-05T09:39:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:IYKLHQ2MKCNIY3YXNRHWAUC7TS","target":"record","payload":{"canonical_record":{"source":{"id":"2406.04409","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-06T18:00:15Z","cross_cats_sorted":["astro-ph.HE","gr-qc"],"title_canon_sha256":"7873ff51f75ad7c10e598c95ee991e5f6c19986aec4552f24f692aec921cc3de","abstract_canon_sha256":"2323ed6292173e41c95d8a93a670637cdb1b623915e8428d73806bd4c05e5f71"},"schema_version":"1.0"},"canonical_sha256":"4614b3c34c509a8c6f176c4f60505f9caae03e02c84e00e040125783b79505f2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:39:23.894033Z","signature_b64":"AmxFR2NgYJ1zOWooO7Q/wiWzKVu+EZRFcC71voFGaXltHgH3+qXAxt6EppiQNYL2N+8eku3GpLb6q28bjokeBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4614b3c34c509a8c6f176c4f60505f9caae03e02c84e00e040125783b79505f2","last_reissued_at":"2026-07-05T09:39:23.893571Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:39:23.893571Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2406.04409","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":"2026-07-05T09:39:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t1HMUmQ7Iguojl6RRDGptlv5JTtVzIeiOiAu12XHzJBtwz1MtejJTe3/j9NVyPMgpoyXlslcZhu3CMV+ZyXFAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T11:53:58.967719Z"},"content_sha256":"71e9834b2a24bccc53f2331ca6fd8b512deee77a05898d455306e1a280eb947e","schema_version":"1.0","event_id":"sha256:71e9834b2a24bccc53f2331ca6fd8b512deee77a05898d455306e1a280eb947e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:IYKLHQ2MKCNIY3YXNRHWAUC7TS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Identifying Host Galaxies of Supermassive Black Hole Binaries Found by PTAs","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE","gr-qc"],"primary_cat":"astro-ph.GA","authors_text":"Chung-Pei Ma, Maria Charisi, Polina Petrov, Stephen R. Taylor","submitted_at":"2024-06-06T18:00:15Z","abstract_excerpt":"Supermassive black hole binaries (SMBHBs) present us with exciting opportunities for multi-messenger science. These systems are thought to form naturally in galaxy mergers and therefore have the potential to produce electromagnetic (EM) radiation as well as gravitational waves (GWs) detectable with pulsar timing arrays (PTAs). Once GWs from individually resolved SMBHBs are detected, the identification of the host galaxy will be a major challenge due to the ambiguity in possible EM signatures and the poor localization capability of PTAs. In order to aid EM observations in choosing which sources"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.04409","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/2406.04409/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":"2026-07-05T09:39:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yi3g5Jx5wgGfOSLbb0//UymbipGNPrVjbgie7O0wYyVctoGXSyg281kx4RKDuopgPsNxA/IB6pKCDzU7ifXgBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T11:53:58.968359Z"},"content_sha256":"8f65b1a64d4319e1665899362bd79e5cfd21db507bc86d8a08ce273040dbb228","schema_version":"1.0","event_id":"sha256:8f65b1a64d4319e1665899362bd79e5cfd21db507bc86d8a08ce273040dbb228"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/bundle.json","state_url":"https://pith.science/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/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":"2026-08-22T11:53:58Z","links":{"resolver":"https://pith.science/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS","bundle":"https://pith.science/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/bundle.json","state":"https://pith.science/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IYKLHQ2MKCNIY3YXNRHWAUC7TS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:IYKLHQ2MKCNIY3YXNRHWAUC7TS","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":"2323ed6292173e41c95d8a93a670637cdb1b623915e8428d73806bd4c05e5f71","cross_cats_sorted":["astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-06T18:00:15Z","title_canon_sha256":"7873ff51f75ad7c10e598c95ee991e5f6c19986aec4552f24f692aec921cc3de"},"schema_version":"1.0","source":{"id":"2406.04409","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.04409","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"arxiv_version","alias_value":"2406.04409v2","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.04409","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_12","alias_value":"IYKLHQ2MKCNI","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_16","alias_value":"IYKLHQ2MKCNIY3YX","created_at":"2026-07-05T09:39:23Z"},{"alias_kind":"pith_short_8","alias_value":"IYKLHQ2M","created_at":"2026-07-05T09:39:23Z"}],"graph_snapshots":[{"event_id":"sha256:8f65b1a64d4319e1665899362bd79e5cfd21db507bc86d8a08ce273040dbb228","target":"graph","created_at":"2026-07-05T09:39:23Z","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/2406.04409/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Supermassive black hole binaries (SMBHBs) present us with exciting opportunities for multi-messenger science. These systems are thought to form naturally in galaxy mergers and therefore have the potential to produce electromagnetic (EM) radiation as well as gravitational waves (GWs) detectable with pulsar timing arrays (PTAs). Once GWs from individually resolved SMBHBs are detected, the identification of the host galaxy will be a major challenge due to the ambiguity in possible EM signatures and the poor localization capability of PTAs. In order to aid EM observations in choosing which sources","authors_text":"Chung-Pei Ma, Maria Charisi, Polina Petrov, Stephen R. Taylor","cross_cats":["astro-ph.HE","gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-06T18:00:15Z","title":"Identifying Host Galaxies of Supermassive Black Hole Binaries Found by PTAs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.04409","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":"sha256:71e9834b2a24bccc53f2331ca6fd8b512deee77a05898d455306e1a280eb947e","target":"record","created_at":"2026-07-05T09:39:23Z","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":"2323ed6292173e41c95d8a93a670637cdb1b623915e8428d73806bd4c05e5f71","cross_cats_sorted":["astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.GA","submitted_at":"2024-06-06T18:00:15Z","title_canon_sha256":"7873ff51f75ad7c10e598c95ee991e5f6c19986aec4552f24f692aec921cc3de"},"schema_version":"1.0","source":{"id":"2406.04409","kind":"arxiv","version":2}},"canonical_sha256":"4614b3c34c509a8c6f176c4f60505f9caae03e02c84e00e040125783b79505f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4614b3c34c509a8c6f176c4f60505f9caae03e02c84e00e040125783b79505f2","first_computed_at":"2026-07-05T09:39:23.893571Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:39:23.893571Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"AmxFR2NgYJ1zOWooO7Q/wiWzKVu+EZRFcC71voFGaXltHgH3+qXAxt6EppiQNYL2N+8eku3GpLb6q28bjokeBA==","signature_status":"signed_v1","signed_at":"2026-07-05T09:39:23.894033Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.04409","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:71e9834b2a24bccc53f2331ca6fd8b512deee77a05898d455306e1a280eb947e","sha256:8f65b1a64d4319e1665899362bd79e5cfd21db507bc86d8a08ce273040dbb228"],"state_sha256":"82db86e0ebc2495f6bd8042440b529af524ec3b798cf3b00fa11ea2bc152beb8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tcyM69siNnLgy/NOaJDgiCxVvRPA/1qS2LkaA/H+ZzQXlVafJb+W5cZY5KLkSsk+VlUDA/g3mcQh0LzFwz7JAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T11:53:58.972221Z","bundle_sha256":"192cb794109560ebf0cd471939a7ce8e2bb6268c42a741136db831942f8d9c16"}}