{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:BZAOLVVCYW2TO2LI53K6RVFNED","short_pith_number":"pith:BZAOLVVC","canonical_record":{"source":{"id":"1602.01669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-04T13:33:38Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"8a167e2b8711b70e9a037accf91f5b90ab3dc61ef3903bce7fedee33a08c06bf","abstract_canon_sha256":"4fc674f5c7591fa192e687afe8dc1c6cfb56b18f97fa874d2109cc8e032f9382"},"schema_version":"1.0"},"canonical_sha256":"0e40e5d6a2c5b5376968eed5e8d4ad20eacf1e760448950e5dd6f75c3c762d50","source":{"kind":"arxiv","id":"1602.01669","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01669","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01669v1","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01669","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"BZAOLVVCYW2T","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"BZAOLVVCYW2TO2LI","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"BZAOLVVC","created_at":"2026-05-18T12:30:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:BZAOLVVCYW2TO2LI53K6RVFNED","target":"record","payload":{"canonical_record":{"source":{"id":"1602.01669","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-04T13:33:38Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"8a167e2b8711b70e9a037accf91f5b90ab3dc61ef3903bce7fedee33a08c06bf","abstract_canon_sha256":"4fc674f5c7591fa192e687afe8dc1c6cfb56b18f97fa874d2109cc8e032f9382"},"schema_version":"1.0"},"canonical_sha256":"0e40e5d6a2c5b5376968eed5e8d4ad20eacf1e760448950e5dd6f75c3c762d50","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:18:29.188537Z","signature_b64":"biIypsrw+q8d0s05gLdopI2WQyRXKHF9k7n2Hp3rb1KW/HbX6LBUKrKV8pQUAzuzM7wfRQI/fpe4yjgAads8Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"0e40e5d6a2c5b5376968eed5e8d4ad20eacf1e760448950e5dd6f75c3c762d50","last_reissued_at":"2026-05-18T01:18:29.188093Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:18:29.188093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.01669","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":"2026-05-18T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ia53sh1pienn6vFF5UcCWP1+E9jJtZAtiGFn10miSXwPtxZ/gT+t6nlgCnHs1hkItMig4JHdjVRvejLgYfwICA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:34:09.997531Z"},"content_sha256":"062ccc362f5c13c44a2fe07d5a1cca2d9cc8907c747ffd8c7ff9a918e087cd83","schema_version":"1.0","event_id":"sha256:062ccc362f5c13c44a2fe07d5a1cca2d9cc8907c747ffd8c7ff9a918e087cd83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:BZAOLVVCYW2TO2LI53K6RVFNED","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Probing spacetime around Sagittarius A* using modeled VLBI closure phases","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"C. Brinkerink, H. Falcke, M. Moscibrodzka, R. Fraga-Encinas","submitted_at":"2016-02-04T13:33:38Z","abstract_excerpt":"The emission region and black hole shadow of Sagittarius A*, the supermassive black hole at the Galactic Center, can be probed with millimeter Very Long Baseline Interferometry. Our goal is to probe the geometry of the emitting plasma around Sgr A* by using modeled mm-VLBI closure phase calculations at 1.3 mm and to constrain the observer's inclination angle and position angle of the black hole spin axis. We have simulated images for three different models of the emission of Sgr A*: an orbiting spot, a disk model, and a jet model. The orbiting spot model was used as a test case scenario, while"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01669","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":""},"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":"2026-05-18T01:18:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zEs6zJvopnLOL/yMdqOCos6OFSN6Dt1gpDcXTf9F4pJX2O0McUfhyhPVaxSpNuOThzEDQYpembNy6zNixtfyBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T21:34:09.997883Z"},"content_sha256":"fac8b2ecc1dca05bd171c37589d6a6a9f00836996a70370667b169049a2a5006","schema_version":"1.0","event_id":"sha256:fac8b2ecc1dca05bd171c37589d6a6a9f00836996a70370667b169049a2a5006"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/BZAOLVVCYW2TO2LI53K6RVFNED/bundle.json","state_url":"https://pith.science/pith/BZAOLVVCYW2TO2LI53K6RVFNED/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/BZAOLVVCYW2TO2LI53K6RVFNED/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":"2026-06-02T21:34:09Z","links":{"resolver":"https://pith.science/pith/BZAOLVVCYW2TO2LI53K6RVFNED","bundle":"https://pith.science/pith/BZAOLVVCYW2TO2LI53K6RVFNED/bundle.json","state":"https://pith.science/pith/BZAOLVVCYW2TO2LI53K6RVFNED/state.json","well_known_bundle":"https://pith.science/.well-known/pith/BZAOLVVCYW2TO2LI53K6RVFNED/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:BZAOLVVCYW2TO2LI53K6RVFNED","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":"4fc674f5c7591fa192e687afe8dc1c6cfb56b18f97fa874d2109cc8e032f9382","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-04T13:33:38Z","title_canon_sha256":"8a167e2b8711b70e9a037accf91f5b90ab3dc61ef3903bce7fedee33a08c06bf"},"schema_version":"1.0","source":{"id":"1602.01669","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.01669","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"arxiv_version","alias_value":"1602.01669v1","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.01669","created_at":"2026-05-18T01:18:29Z"},{"alias_kind":"pith_short_12","alias_value":"BZAOLVVCYW2T","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_16","alias_value":"BZAOLVVCYW2TO2LI","created_at":"2026-05-18T12:30:09Z"},{"alias_kind":"pith_short_8","alias_value":"BZAOLVVC","created_at":"2026-05-18T12:30:09Z"}],"graph_snapshots":[{"event_id":"sha256:fac8b2ecc1dca05bd171c37589d6a6a9f00836996a70370667b169049a2a5006","target":"graph","created_at":"2026-05-18T01:18:29Z","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"},"paper":{"abstract_excerpt":"The emission region and black hole shadow of Sagittarius A*, the supermassive black hole at the Galactic Center, can be probed with millimeter Very Long Baseline Interferometry. Our goal is to probe the geometry of the emitting plasma around Sgr A* by using modeled mm-VLBI closure phase calculations at 1.3 mm and to constrain the observer's inclination angle and position angle of the black hole spin axis. We have simulated images for three different models of the emission of Sgr A*: an orbiting spot, a disk model, and a jet model. The orbiting spot model was used as a test case scenario, while","authors_text":"C. Brinkerink, H. Falcke, M. Moscibrodzka, R. Fraga-Encinas","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-04T13:33:38Z","title":"Probing spacetime around Sagittarius A* using modeled VLBI closure phases"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.01669","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":"sha256:062ccc362f5c13c44a2fe07d5a1cca2d9cc8907c747ffd8c7ff9a918e087cd83","target":"record","created_at":"2026-05-18T01:18:29Z","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":"4fc674f5c7591fa192e687afe8dc1c6cfb56b18f97fa874d2109cc8e032f9382","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2016-02-04T13:33:38Z","title_canon_sha256":"8a167e2b8711b70e9a037accf91f5b90ab3dc61ef3903bce7fedee33a08c06bf"},"schema_version":"1.0","source":{"id":"1602.01669","kind":"arxiv","version":1}},"canonical_sha256":"0e40e5d6a2c5b5376968eed5e8d4ad20eacf1e760448950e5dd6f75c3c762d50","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"0e40e5d6a2c5b5376968eed5e8d4ad20eacf1e760448950e5dd6f75c3c762d50","first_computed_at":"2026-05-18T01:18:29.188093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:18:29.188093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"biIypsrw+q8d0s05gLdopI2WQyRXKHF9k7n2Hp3rb1KW/HbX6LBUKrKV8pQUAzuzM7wfRQI/fpe4yjgAads8Ag==","signature_status":"signed_v1","signed_at":"2026-05-18T01:18:29.188537Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.01669","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:062ccc362f5c13c44a2fe07d5a1cca2d9cc8907c747ffd8c7ff9a918e087cd83","sha256:fac8b2ecc1dca05bd171c37589d6a6a9f00836996a70370667b169049a2a5006"],"state_sha256":"e21b1c38927c7ba76a85ca874ea366494203582bb5d0caf529f96835d8d1629f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3e6fQWspYnhJhpFLWd33pIFcvf6wu4/8VDf1uRmQklmIIERqZ2SyEs7dIfATuGFUO7LNMDJxpTlukfH8DaqdDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T21:34:09.999925Z","bundle_sha256":"2685c9c0176cd83dc986d82dca12315083835b99b54e191dfedfe78975c293f5"}}