{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:XRXQK5OIR67G5JTFWZ4DF5R6W6","short_pith_number":"pith:XRXQK5OI","canonical_record":{"source":{"id":"2408.16049","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-08-28T18:00:01Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"6c390bac3662a47ae64b8939db2d00425887e511ab77824d30ac3f6e2844d18e","abstract_canon_sha256":"aaa4fc543db9c31bf5c74af46122eefef33bdbf7143317c2cdaa6bacc763048c"},"schema_version":"1.0"},"canonical_sha256":"bc6f0575c88fbe6ea665b67832f63eb7884afeb971af7dd5523b5cc9885e1a01","source":{"kind":"arxiv","id":"2408.16049","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.16049","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"arxiv_version","alias_value":"2408.16049v2","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.16049","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_12","alias_value":"XRXQK5OIR67G","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_16","alias_value":"XRXQK5OIR67G5JTF","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_8","alias_value":"XRXQK5OI","created_at":"2026-07-05T10:41:48Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:XRXQK5OIR67G5JTFWZ4DF5R6W6","target":"record","payload":{"canonical_record":{"source":{"id":"2408.16049","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-08-28T18:00:01Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"6c390bac3662a47ae64b8939db2d00425887e511ab77824d30ac3f6e2844d18e","abstract_canon_sha256":"aaa4fc543db9c31bf5c74af46122eefef33bdbf7143317c2cdaa6bacc763048c"},"schema_version":"1.0"},"canonical_sha256":"bc6f0575c88fbe6ea665b67832f63eb7884afeb971af7dd5523b5cc9885e1a01","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:41:48.318863Z","signature_b64":"QmpF/w+ttZZ4GIvhH2irt7Fj+kzPUXzLZUca9KilbhEphX4bpXcNFUw4b+yPjmoPpCHVfkYJjt0AKtZiDgoaDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bc6f0575c88fbe6ea665b67832f63eb7884afeb971af7dd5523b5cc9885e1a01","last_reissued_at":"2026-07-05T10:41:48.318310Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:41:48.318310Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2408.16049","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":"2026-07-05T10:41:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m8ZcWFS8rz8hB5uVx8/ns72H2RnXQchDiVIklk6Ce81HxoqrliLMsd2Z0BE0+JwNSA9ICwLJXmUU0yJSgRuIBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T18:45:26.138036Z"},"content_sha256":"3a3e63bc7901d52a9c8e9aecf314d46b124eac071a1866ca1bd1e009f8b9f43c","schema_version":"1.0","event_id":"sha256:3a3e63bc7901d52a9c8e9aecf314d46b124eac071a1866ca1bd1e009f8b9f43c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:XRXQK5OIR67G5JTFWZ4DF5R6W6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Forward Ray Tracing and Hot Spots in Kerr Spacetime","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"gr-qc","authors_text":"Lihang Zhou, Vitor Cardoso, Yifan Chen, Zhen Zhong","submitted_at":"2024-08-28T18:00:01Z","abstract_excerpt":"Hotspots, often characterized as pointlike emissions, frequently appear near black holes with significantly enhanced luminosity compared to the surrounding accretion flow. Notably, such hotspots are regularly observed near the black hole at the center of the Milky Way. Light rays emitted from these sources follow complex trajectories around the black hole before reaching distinct locations on the observer's image plane. Precisely resolving both direct emissions and their higher-order images--despite the latter's intensity suppression--is essential for extracting detailed spacetime information,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.16049","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/2408.16049/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":"2026-07-05T10:41:48Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AM8pF+QcIpF/1kcVr/wSpVBu+/fgT6A0icpHZeBvAu46Dn41OD8XVHzq0IYn7OkRq4hb7cMH+sE6faIw03lHAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-10T18:45:26.138584Z"},"content_sha256":"44d0a5a0a5499be506c10c9fe78620397bfa51d42542e20c290c75a2da22df70","schema_version":"1.0","event_id":"sha256:44d0a5a0a5499be506c10c9fe78620397bfa51d42542e20c290c75a2da22df70"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/bundle.json","state_url":"https://pith.science/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/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":"2026-08-10T18:45:26Z","links":{"resolver":"https://pith.science/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6","bundle":"https://pith.science/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/bundle.json","state":"https://pith.science/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XRXQK5OIR67G5JTFWZ4DF5R6W6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:XRXQK5OIR67G5JTFWZ4DF5R6W6","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":"aaa4fc543db9c31bf5c74af46122eefef33bdbf7143317c2cdaa6bacc763048c","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-08-28T18:00:01Z","title_canon_sha256":"6c390bac3662a47ae64b8939db2d00425887e511ab77824d30ac3f6e2844d18e"},"schema_version":"1.0","source":{"id":"2408.16049","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2408.16049","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"arxiv_version","alias_value":"2408.16049v2","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2408.16049","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_12","alias_value":"XRXQK5OIR67G","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_16","alias_value":"XRXQK5OIR67G5JTF","created_at":"2026-07-05T10:41:48Z"},{"alias_kind":"pith_short_8","alias_value":"XRXQK5OI","created_at":"2026-07-05T10:41:48Z"}],"graph_snapshots":[{"event_id":"sha256:44d0a5a0a5499be506c10c9fe78620397bfa51d42542e20c290c75a2da22df70","target":"graph","created_at":"2026-07-05T10:41:48Z","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/2408.16049/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Hotspots, often characterized as pointlike emissions, frequently appear near black holes with significantly enhanced luminosity compared to the surrounding accretion flow. Notably, such hotspots are regularly observed near the black hole at the center of the Milky Way. Light rays emitted from these sources follow complex trajectories around the black hole before reaching distinct locations on the observer's image plane. Precisely resolving both direct emissions and their higher-order images--despite the latter's intensity suppression--is essential for extracting detailed spacetime information,","authors_text":"Lihang Zhou, Vitor Cardoso, Yifan Chen, Zhen Zhong","cross_cats":["astro-ph.HE"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-08-28T18:00:01Z","title":"Forward Ray Tracing and Hot Spots in Kerr Spacetime"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2408.16049","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":"sha256:3a3e63bc7901d52a9c8e9aecf314d46b124eac071a1866ca1bd1e009f8b9f43c","target":"record","created_at":"2026-07-05T10:41:48Z","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":"aaa4fc543db9c31bf5c74af46122eefef33bdbf7143317c2cdaa6bacc763048c","cross_cats_sorted":["astro-ph.HE"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"gr-qc","submitted_at":"2024-08-28T18:00:01Z","title_canon_sha256":"6c390bac3662a47ae64b8939db2d00425887e511ab77824d30ac3f6e2844d18e"},"schema_version":"1.0","source":{"id":"2408.16049","kind":"arxiv","version":2}},"canonical_sha256":"bc6f0575c88fbe6ea665b67832f63eb7884afeb971af7dd5523b5cc9885e1a01","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bc6f0575c88fbe6ea665b67832f63eb7884afeb971af7dd5523b5cc9885e1a01","first_computed_at":"2026-07-05T10:41:48.318310Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:41:48.318310Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QmpF/w+ttZZ4GIvhH2irt7Fj+kzPUXzLZUca9KilbhEphX4bpXcNFUw4b+yPjmoPpCHVfkYJjt0AKtZiDgoaDw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:41:48.318863Z","signed_message":"canonical_sha256_bytes"},"source_id":"2408.16049","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3a3e63bc7901d52a9c8e9aecf314d46b124eac071a1866ca1bd1e009f8b9f43c","sha256:44d0a5a0a5499be506c10c9fe78620397bfa51d42542e20c290c75a2da22df70"],"state_sha256":"d953f4fe91e23204b601ca4393d17028a66bc6ff8c3d590df9ed387fee1bc9e8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yIKcsHcO4Zoiy8iBPv7N+N6DkZ6vqIJ2q3qv4VhxX++FAkkqS9GnHU1p3q7p5L7zRPlAHc0iZ3u1gHyRuH5uDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-10T18:45:26.143191Z","bundle_sha256":"a3afaa8b85501c2ddcbbf244c47915f35410ec6b3e3b1dc448253986d0e4d311"}}