{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:D3I42SDQV5DCYMNLESHO7FGYJY","short_pith_number":"pith:D3I42SDQ","canonical_record":{"source":{"id":"1104.3146","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-04-15T20:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"095a858a4f0b5aa4a8f79c5b620c5df8ffc865e56ff9cff1fac12a996a0ac71c","abstract_canon_sha256":"54640efd3db9e1a410368128a152e44cc483a5f6d33a33a8e98aba971aa76afa"},"schema_version":"1.0"},"canonical_sha256":"1ed1cd4870af462c31ab248eef94d84e2cfa6e1d3d10c097f5c3975ccb098f38","source":{"kind":"arxiv","id":"1104.3146","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1104.3146","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"arxiv_version","alias_value":"1104.3146v1","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1104.3146","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"pith_short_12","alias_value":"D3I42SDQV5DC","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"D3I42SDQV5DCYMNL","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"D3I42SDQ","created_at":"2026-05-18T12:26:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:D3I42SDQV5DCYMNLESHO7FGYJY","target":"record","payload":{"canonical_record":{"source":{"id":"1104.3146","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-04-15T20:04:13Z","cross_cats_sorted":[],"title_canon_sha256":"095a858a4f0b5aa4a8f79c5b620c5df8ffc865e56ff9cff1fac12a996a0ac71c","abstract_canon_sha256":"54640efd3db9e1a410368128a152e44cc483a5f6d33a33a8e98aba971aa76afa"},"schema_version":"1.0"},"canonical_sha256":"1ed1cd4870af462c31ab248eef94d84e2cfa6e1d3d10c097f5c3975ccb098f38","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:02:27.881479Z","signature_b64":"RBVglhQ1N6Y39lXUgSKjBtQpc/TCBlH1YYkAS1N23uMDPsTs6B8pinMsajBtUMipLCJn49/3WmUrr4IBnuwZDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1ed1cd4870af462c31ab248eef94d84e2cfa6e1d3d10c097f5c3975ccb098f38","last_reissued_at":"2026-05-18T02:02:27.878650Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:02:27.878650Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1104.3146","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":"2026-05-18T02:02:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/FRcwm3FV8dJUnIrx9JFIJX+1kAGgk+HxO25q0YMMvkzvMUP6OsEuyXZk8jzn82F0TrPaxeTEoGNavd5YgVEBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:34:58.368296Z"},"content_sha256":"743e7cbab97dba5f9def6f9c20f47f89963c7b9998f151616323f5599a70038e","schema_version":"1.0","event_id":"sha256:743e7cbab97dba5f9def6f9c20f47f89963c7b9998f151616323f5599a70038e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:D3I42SDQV5DCYMNLESHO7FGYJY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"(2) CfA, 3), (3) ITC), Abraham Loeb (2, Avery E. Broderick (1), Mark J. Reid (2) ((1) CITA","submitted_at":"2011-04-15T20:04:13Z","abstract_excerpt":"With the advent of the Event Horizon Telescope (EHT), a millimeter/sub-millimeter very-long baseline interferometer (VLBI), it has become possible to image a handful of black holes with sub-horizon resolutions. However, these images do not translate into microarcsecond absolute positions due to the lack of absolute phase information when an external phase reference is not used. Due to the short atmospheric coherence time at these wavelengths, nodding between the source and phase reference is impractical. However, here we suggest an alternative scheme which makes use of the fact that many of th"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1104.3146","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":"2026-05-18T02:02:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Q2FewZ1BBd840qFb759G+PKeJdtdZNgNvtcXiwFpw9/xIHHTSfDdKYNw+W/h8uJHFKSvxX66/gvM17qLVna5BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-28T14:34:58.368666Z"},"content_sha256":"2ea17c3312c5064cbca1864c61fad84ef7d5a738492d1d0d422432b825792406","schema_version":"1.0","event_id":"sha256:2ea17c3312c5064cbca1864c61fad84ef7d5a738492d1d0d422432b825792406"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/D3I42SDQV5DCYMNLESHO7FGYJY/bundle.json","state_url":"https://pith.science/pith/D3I42SDQV5DCYMNLESHO7FGYJY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/D3I42SDQV5DCYMNLESHO7FGYJY/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":"2026-06-28T14:34:58Z","links":{"resolver":"https://pith.science/pith/D3I42SDQV5DCYMNLESHO7FGYJY","bundle":"https://pith.science/pith/D3I42SDQV5DCYMNLESHO7FGYJY/bundle.json","state":"https://pith.science/pith/D3I42SDQV5DCYMNLESHO7FGYJY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/D3I42SDQV5DCYMNLESHO7FGYJY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:D3I42SDQV5DCYMNLESHO7FGYJY","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":"54640efd3db9e1a410368128a152e44cc483a5f6d33a33a8e98aba971aa76afa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-04-15T20:04:13Z","title_canon_sha256":"095a858a4f0b5aa4a8f79c5b620c5df8ffc865e56ff9cff1fac12a996a0ac71c"},"schema_version":"1.0","source":{"id":"1104.3146","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1104.3146","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"arxiv_version","alias_value":"1104.3146v1","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1104.3146","created_at":"2026-05-18T02:02:27Z"},{"alias_kind":"pith_short_12","alias_value":"D3I42SDQV5DC","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"D3I42SDQV5DCYMNL","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"D3I42SDQ","created_at":"2026-05-18T12:26:26Z"}],"graph_snapshots":[{"event_id":"sha256:2ea17c3312c5064cbca1864c61fad84ef7d5a738492d1d0d422432b825792406","target":"graph","created_at":"2026-05-18T02:02:27Z","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":"With the advent of the Event Horizon Telescope (EHT), a millimeter/sub-millimeter very-long baseline interferometer (VLBI), it has become possible to image a handful of black holes with sub-horizon resolutions. However, these images do not translate into microarcsecond absolute positions due to the lack of absolute phase information when an external phase reference is not used. Due to the short atmospheric coherence time at these wavelengths, nodding between the source and phase reference is impractical. However, here we suggest an alternative scheme which makes use of the fact that many of th","authors_text":"(2) CfA, 3), (3) ITC), Abraham Loeb (2, Avery E. Broderick (1), Mark J. Reid (2) ((1) CITA","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-04-15T20:04:13Z","title":"Localizing Sagittarius A* and M87 on Microarcsecond Scales with Millimeter VLBI"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1104.3146","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":"sha256:743e7cbab97dba5f9def6f9c20f47f89963c7b9998f151616323f5599a70038e","target":"record","created_at":"2026-05-18T02:02:27Z","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":"54640efd3db9e1a410368128a152e44cc483a5f6d33a33a8e98aba971aa76afa","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2011-04-15T20:04:13Z","title_canon_sha256":"095a858a4f0b5aa4a8f79c5b620c5df8ffc865e56ff9cff1fac12a996a0ac71c"},"schema_version":"1.0","source":{"id":"1104.3146","kind":"arxiv","version":1}},"canonical_sha256":"1ed1cd4870af462c31ab248eef94d84e2cfa6e1d3d10c097f5c3975ccb098f38","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1ed1cd4870af462c31ab248eef94d84e2cfa6e1d3d10c097f5c3975ccb098f38","first_computed_at":"2026-05-18T02:02:27.878650Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:02:27.878650Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RBVglhQ1N6Y39lXUgSKjBtQpc/TCBlH1YYkAS1N23uMDPsTs6B8pinMsajBtUMipLCJn49/3WmUrr4IBnuwZDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:02:27.881479Z","signed_message":"canonical_sha256_bytes"},"source_id":"1104.3146","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:743e7cbab97dba5f9def6f9c20f47f89963c7b9998f151616323f5599a70038e","sha256:2ea17c3312c5064cbca1864c61fad84ef7d5a738492d1d0d422432b825792406"],"state_sha256":"99c680b731b5dda1f076783534cd47a634d969ad74255145947002a756316d2c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gY+CaEn6BvM+Uu74cPW8ZooqJH+/nJHPxW97o3cpBxCemb2EmKYPuok6+YNHM/kEQFg7gv3VXtDDF63LFOQ3Dg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-28T14:34:58.370557Z","bundle_sha256":"ae59c9fd7ff56c11eb5dd0570f972ca1a9135972940ce84e45152969257df771"}}