{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:7V2DY27IO24EOD7HNEXKVGICHX","short_pith_number":"pith:7V2DY27I","canonical_record":{"source":{"id":"2406.12917","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-06-13T18:09:02Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","gr-qc"],"title_canon_sha256":"367bf7fa28747131402fc2d796979d595d09a825231792fdba3432f8cc0de7cb","abstract_canon_sha256":"08729a1e72c964c9726ae33003255758b430ee9cbc88902c096e073ab40a7392"},"schema_version":"1.0"},"canonical_sha256":"fd743c6be876b8470fe7692eaa99023df2507c5bea1e477ee559ace5e35ea482","source":{"kind":"arxiv","id":"2406.12917","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.12917","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"arxiv_version","alias_value":"2406.12917v1","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.12917","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_12","alias_value":"7V2DY27IO24E","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"7V2DY27IO24EOD7H","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"7V2DY27I","created_at":"2026-07-05T09:27:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:7V2DY27IO24EOD7HNEXKVGICHX","target":"record","payload":{"canonical_record":{"source":{"id":"2406.12917","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-06-13T18:09:02Z","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","gr-qc"],"title_canon_sha256":"367bf7fa28747131402fc2d796979d595d09a825231792fdba3432f8cc0de7cb","abstract_canon_sha256":"08729a1e72c964c9726ae33003255758b430ee9cbc88902c096e073ab40a7392"},"schema_version":"1.0"},"canonical_sha256":"fd743c6be876b8470fe7692eaa99023df2507c5bea1e477ee559ace5e35ea482","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T09:27:23.511564Z","signature_b64":"WBrWr+GGSB55qyCmAWScWoQE60VEtePParThNyeRjHxCe1nQ4EaCgvGqQ7l+KRmArdIGdXnrzlEFBU1jqSI2DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fd743c6be876b8470fe7692eaa99023df2507c5bea1e477ee559ace5e35ea482","last_reissued_at":"2026-07-05T09:27:23.511064Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T09:27:23.511064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2406.12917","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":"2026-07-05T09:27:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"sKH25oEACAEsWS6rq2Y6otsBvlzqR9fdjH+cIXRg9M6Bgy+djZHFKb7/LCWrVa9JVmfTYbh9YCARRFTOxTYYCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T18:37:22.878045Z"},"content_sha256":"18973958ed17db78d52c4f2e1b75eec0a2a152dc69d5c2431d257dc1d4319cf2","schema_version":"1.0","event_id":"sha256:18973958ed17db78d52c4f2e1b75eec0a2a152dc69d5c2431d257dc1d4319cf2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:7V2DY27IO24EOD7HNEXKVGICHX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Black Hole Explorer: Motivation and Vision","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA","astro-ph.HE","gr-qc"],"primary_cat":"astro-ph.IM","authors_text":"Alan P. Marscher, Alejandro Cardenas-Avendano, Alexander Plavin, Alexandru Lupsasca, Andrew Chael, Andrew Strominger, Angelo Ricarte, Ben Hudson, Bryan Bilyeu, Cathy Chou, Charles F. Gammie, Chi-kwan Chan, Chung-Pei Ma, Daniel C. M. Palumbo, Daniel P. Marrone, Dominic Chang, Dominic Pesce, Don Boroson, Edward Tong, Eliad Peretz, Eliot Quataert, Eric J. Palmer, Freek Roelofs, Gary J. Melnick, George Wong, Hannah Rana, He Jia, Jade Wang, Janice Houston, Jeffrey Small, Jens Kauffmann, Jonathan Weintroub, Jose L. Gomez, Joseph Farah, Kari Haworth, Katia Shtyrkova, Kazuhiro Hada, Kazunori Akiyama, Kotaro Niinuma, Laura C. Sinclair, Lenny Paritsky, Leonid I. Gurvits, Lindy Blackburn, Maciek Wielgus, Mareki Honma, Michael D. Johnson, Michael H. Hecht, Paul Grimes, Paul Tiede, Peter Cheimets, Peter Galison, Peter Kurczynski, Ramesh Narayan, Ranjani Srinivasan, Rebecca Baturin, Robert Lafon, Robert Lehmensiek, Ronald Gamble, Samuel E. Gralla, Sara Issaoun, Scott C. Noble, Shahar Hadar, Sheperd S. Doeleman, Sridharan Tirupati Kumara, Svetlana Jorstad, Xinyue Alice Zhang, Yuri Y. Kovalev, Zachary Gelles","submitted_at":"2024-06-13T18:09:02Z","abstract_excerpt":"We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX will discover and measure the bright and narrow \"photon ring\" that is predicted to exist in images of black holes, produced from light that has orbited the black hole before escaping. This discovery will expose universal features of a black hole's spacetime that are distinct from the complex astrophysics of the emitting plasma, allowing the first direct measurements of a supermassive black hole'"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.12917","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/2406.12917/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":"2026-07-05T09:27:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oJmuhV+4HPotc4Yv/ho9B7h3gfw6KvIXzRBMPyAH0YZwD23CzpGDgP3JPaDwnxyOGakYvR1aZ7b9CP90EgsOAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T18:37:22.878719Z"},"content_sha256":"2d7c7cd07e6c45363597ca364fa678d6898b47e90df864870157150d701748b2","schema_version":"1.0","event_id":"sha256:2d7c7cd07e6c45363597ca364fa678d6898b47e90df864870157150d701748b2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7V2DY27IO24EOD7HNEXKVGICHX/bundle.json","state_url":"https://pith.science/pith/7V2DY27IO24EOD7HNEXKVGICHX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7V2DY27IO24EOD7HNEXKVGICHX/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":"2026-08-06T18:37:22Z","links":{"resolver":"https://pith.science/pith/7V2DY27IO24EOD7HNEXKVGICHX","bundle":"https://pith.science/pith/7V2DY27IO24EOD7HNEXKVGICHX/bundle.json","state":"https://pith.science/pith/7V2DY27IO24EOD7HNEXKVGICHX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7V2DY27IO24EOD7HNEXKVGICHX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:7V2DY27IO24EOD7HNEXKVGICHX","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":"08729a1e72c964c9726ae33003255758b430ee9cbc88902c096e073ab40a7392","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-06-13T18:09:02Z","title_canon_sha256":"367bf7fa28747131402fc2d796979d595d09a825231792fdba3432f8cc0de7cb"},"schema_version":"1.0","source":{"id":"2406.12917","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2406.12917","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"arxiv_version","alias_value":"2406.12917v1","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2406.12917","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_12","alias_value":"7V2DY27IO24E","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_16","alias_value":"7V2DY27IO24EOD7H","created_at":"2026-07-05T09:27:23Z"},{"alias_kind":"pith_short_8","alias_value":"7V2DY27I","created_at":"2026-07-05T09:27:23Z"}],"graph_snapshots":[{"event_id":"sha256:2d7c7cd07e6c45363597ca364fa678d6898b47e90df864870157150d701748b2","target":"graph","created_at":"2026-07-05T09:27:23Z","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/2406.12917/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry (VLBI) to space. BHEX will discover and measure the bright and narrow \"photon ring\" that is predicted to exist in images of black holes, produced from light that has orbited the black hole before escaping. This discovery will expose universal features of a black hole's spacetime that are distinct from the complex astrophysics of the emitting plasma, allowing the first direct measurements of a supermassive black hole'","authors_text":"Alan P. Marscher, Alejandro Cardenas-Avendano, Alexander Plavin, Alexandru Lupsasca, Andrew Chael, Andrew Strominger, Angelo Ricarte, Ben Hudson, Bryan Bilyeu, Cathy Chou, Charles F. Gammie, Chi-kwan Chan, Chung-Pei Ma, Daniel C. M. Palumbo, Daniel P. Marrone, Dominic Chang, Dominic Pesce, Don Boroson, Edward Tong, Eliad Peretz, Eliot Quataert, Eric J. Palmer, Freek Roelofs, Gary J. Melnick, George Wong, Hannah Rana, He Jia, Jade Wang, Janice Houston, Jeffrey Small, Jens Kauffmann, Jonathan Weintroub, Jose L. Gomez, Joseph Farah, Kari Haworth, Katia Shtyrkova, Kazuhiro Hada, Kazunori Akiyama, Kotaro Niinuma, Laura C. Sinclair, Lenny Paritsky, Leonid I. Gurvits, Lindy Blackburn, Maciek Wielgus, Mareki Honma, Michael D. Johnson, Michael H. Hecht, Paul Grimes, Paul Tiede, Peter Cheimets, Peter Galison, Peter Kurczynski, Ramesh Narayan, Ranjani Srinivasan, Rebecca Baturin, Robert Lafon, Robert Lehmensiek, Ronald Gamble, Samuel E. Gralla, Sara Issaoun, Scott C. Noble, Shahar Hadar, Sheperd S. Doeleman, Sridharan Tirupati Kumara, Svetlana Jorstad, Xinyue Alice Zhang, Yuri Y. Kovalev, Zachary Gelles","cross_cats":["astro-ph.GA","astro-ph.HE","gr-qc"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-06-13T18:09:02Z","title":"The Black Hole Explorer: Motivation and Vision"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2406.12917","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":"sha256:18973958ed17db78d52c4f2e1b75eec0a2a152dc69d5c2431d257dc1d4319cf2","target":"record","created_at":"2026-07-05T09:27:23Z","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":"08729a1e72c964c9726ae33003255758b430ee9cbc88902c096e073ab40a7392","cross_cats_sorted":["astro-ph.GA","astro-ph.HE","gr-qc"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-06-13T18:09:02Z","title_canon_sha256":"367bf7fa28747131402fc2d796979d595d09a825231792fdba3432f8cc0de7cb"},"schema_version":"1.0","source":{"id":"2406.12917","kind":"arxiv","version":1}},"canonical_sha256":"fd743c6be876b8470fe7692eaa99023df2507c5bea1e477ee559ace5e35ea482","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fd743c6be876b8470fe7692eaa99023df2507c5bea1e477ee559ace5e35ea482","first_computed_at":"2026-07-05T09:27:23.511064Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:27:23.511064Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WBrWr+GGSB55qyCmAWScWoQE60VEtePParThNyeRjHxCe1nQ4EaCgvGqQ7l+KRmArdIGdXnrzlEFBU1jqSI2DA==","signature_status":"signed_v1","signed_at":"2026-07-05T09:27:23.511564Z","signed_message":"canonical_sha256_bytes"},"source_id":"2406.12917","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:18973958ed17db78d52c4f2e1b75eec0a2a152dc69d5c2431d257dc1d4319cf2","sha256:2d7c7cd07e6c45363597ca364fa678d6898b47e90df864870157150d701748b2"],"state_sha256":"ff6a9ac5376ca5753bd4b3e4f003b1d0fb931f4972fce1c710296407b0867f36"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QXJP+z1isWZwTdX7mD1/ujHAV0bi01QUl2MTzO1HNO7zOWknfCu05xq94j4TljAh1J/+wWHrlnpga2bRAM4vAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T18:37:22.886323Z","bundle_sha256":"620a9ba8f0563d284974ff7dcd91bf4cd3f963cf7cff4d9820a496fb578ee379"}}