{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:PSHCZKMC457P3RT6O6LSRRAQFU","short_pith_number":"pith:PSHCZKMC","canonical_record":{"source":{"id":"2001.04386","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-01-13T16:41:27Z","cross_cats_sorted":[],"title_canon_sha256":"7cc4ffbce5b3226ff055f61cef5b37327d4b77b75c9e8ac34a8eeaca1b636da3","abstract_canon_sha256":"9c828f12e438a0eba2e3658833e1bd13da356229f4041e58ffa70f80d5f28203"},"schema_version":"1.0"},"canonical_sha256":"7c8e2ca982e77efdc67e779728c4102d2b0b34d0d9e48048b5a7d5ffb83e48d4","source":{"kind":"arxiv","id":"2001.04386","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2001.04386","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"arxiv_version","alias_value":"2001.04386v1","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.04386","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_12","alias_value":"PSHCZKMC457P","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_16","alias_value":"PSHCZKMC457P3RT6","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_8","alias_value":"PSHCZKMC","created_at":"2026-07-05T00:51:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:PSHCZKMC457P3RT6O6LSRRAQFU","target":"record","payload":{"canonical_record":{"source":{"id":"2001.04386","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-01-13T16:41:27Z","cross_cats_sorted":[],"title_canon_sha256":"7cc4ffbce5b3226ff055f61cef5b37327d4b77b75c9e8ac34a8eeaca1b636da3","abstract_canon_sha256":"9c828f12e438a0eba2e3658833e1bd13da356229f4041e58ffa70f80d5f28203"},"schema_version":"1.0"},"canonical_sha256":"7c8e2ca982e77efdc67e779728c4102d2b0b34d0d9e48048b5a7d5ffb83e48d4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:51:38.159742Z","signature_b64":"rIMkXnxnHpV0Kp5kolWvOKh17oQhH0wOlvyQ5MN5KJ05XOWBI6gVJQm0E2IaLbqY9Vrdj/j6vLrFeLQoZUrcDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7c8e2ca982e77efdc67e779728c4102d2b0b34d0d9e48048b5a7d5ffb83e48d4","last_reissued_at":"2026-07-05T00:51:38.159266Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:51:38.159266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2001.04386","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":"2026-07-05T00:51:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z3KQwFluNiqaeFtF8zQj4q8tip0aoGIPwJ4rj6pzZ5/aaVriEOoA98jwbiaNIUNPIBuq2BAs9qkuevDdZGkbCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T13:15:51.660662Z"},"content_sha256":"d93109ad4acc13b25059fd9b32a77a7134c2225db8174276fdadd141a7e9a5ea","schema_version":"1.0","event_id":"sha256:d93109ad4acc13b25059fd9b32a77a7134c2225db8174276fdadd141a7e9a5ea"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:PSHCZKMC457P3RT6O6LSRRAQFU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. Brunthaler, M. J. Reid","submitted_at":"2020-01-13T16:41:27Z","abstract_excerpt":"We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 years. The apparent motion of Sgr A* is -6.411 +/- 0.008 mas/yr along the Galactic plane and -0.219 +/- 0.007 mas/yr toward the North Galactic Pole. This apparent motion can almost entirely be attributed to the effects of the Sun's orbit about the Galactic center. Removing these effects yields residuals of -0.58 +/- 2.23 km/s in the direction of Galactic rotation and -0.85 +/- 0.75 km/s toward the North Galactic Pole. A maximum-likelihood analysis of t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.04386","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/2001.04386/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":"2026-07-05T00:51:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Bq2ipxQ/4S1kua8e0XLPz3DgCzGVHrPmCu5tPwdPqogm4xRgBq4PqDoXZUwNuGPvJldxuhPSJsQsDadYOQCvAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-12T13:15:51.661202Z"},"content_sha256":"4a7ada73322bc7fcb62a8892e296416b4d0fd168580943e47241876aff036c88","schema_version":"1.0","event_id":"sha256:4a7ada73322bc7fcb62a8892e296416b4d0fd168580943e47241876aff036c88"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PSHCZKMC457P3RT6O6LSRRAQFU/bundle.json","state_url":"https://pith.science/pith/PSHCZKMC457P3RT6O6LSRRAQFU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PSHCZKMC457P3RT6O6LSRRAQFU/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":"2026-08-12T13:15:51Z","links":{"resolver":"https://pith.science/pith/PSHCZKMC457P3RT6O6LSRRAQFU","bundle":"https://pith.science/pith/PSHCZKMC457P3RT6O6LSRRAQFU/bundle.json","state":"https://pith.science/pith/PSHCZKMC457P3RT6O6LSRRAQFU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PSHCZKMC457P3RT6O6LSRRAQFU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:PSHCZKMC457P3RT6O6LSRRAQFU","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":"9c828f12e438a0eba2e3658833e1bd13da356229f4041e58ffa70f80d5f28203","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-01-13T16:41:27Z","title_canon_sha256":"7cc4ffbce5b3226ff055f61cef5b37327d4b77b75c9e8ac34a8eeaca1b636da3"},"schema_version":"1.0","source":{"id":"2001.04386","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2001.04386","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"arxiv_version","alias_value":"2001.04386v1","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2001.04386","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_12","alias_value":"PSHCZKMC457P","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_16","alias_value":"PSHCZKMC457P3RT6","created_at":"2026-07-05T00:51:38Z"},{"alias_kind":"pith_short_8","alias_value":"PSHCZKMC","created_at":"2026-07-05T00:51:38Z"}],"graph_snapshots":[{"event_id":"sha256:4a7ada73322bc7fcb62a8892e296416b4d0fd168580943e47241876aff036c88","target":"graph","created_at":"2026-07-05T00:51:38Z","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/2001.04386/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We report measurements with the Very Long Baseline Array of the proper motion of Sgr A* relative to two extragalactic radio sources spanning 18 years. The apparent motion of Sgr A* is -6.411 +/- 0.008 mas/yr along the Galactic plane and -0.219 +/- 0.007 mas/yr toward the North Galactic Pole. This apparent motion can almost entirely be attributed to the effects of the Sun's orbit about the Galactic center. Removing these effects yields residuals of -0.58 +/- 2.23 km/s in the direction of Galactic rotation and -0.85 +/- 0.75 km/s toward the North Galactic Pole. A maximum-likelihood analysis of t","authors_text":"A. Brunthaler, M. J. Reid","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-01-13T16:41:27Z","title":"The Proper Motion of Sagittarius A*: III. The Case for a Supermassive Black Hole"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2001.04386","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:d93109ad4acc13b25059fd9b32a77a7134c2225db8174276fdadd141a7e9a5ea","target":"record","created_at":"2026-07-05T00:51:38Z","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":"9c828f12e438a0eba2e3658833e1bd13da356229f4041e58ffa70f80d5f28203","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2020-01-13T16:41:27Z","title_canon_sha256":"7cc4ffbce5b3226ff055f61cef5b37327d4b77b75c9e8ac34a8eeaca1b636da3"},"schema_version":"1.0","source":{"id":"2001.04386","kind":"arxiv","version":1}},"canonical_sha256":"7c8e2ca982e77efdc67e779728c4102d2b0b34d0d9e48048b5a7d5ffb83e48d4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7c8e2ca982e77efdc67e779728c4102d2b0b34d0d9e48048b5a7d5ffb83e48d4","first_computed_at":"2026-07-05T00:51:38.159266Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:51:38.159266Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rIMkXnxnHpV0Kp5kolWvOKh17oQhH0wOlvyQ5MN5KJ05XOWBI6gVJQm0E2IaLbqY9Vrdj/j6vLrFeLQoZUrcDA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:51:38.159742Z","signed_message":"canonical_sha256_bytes"},"source_id":"2001.04386","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d93109ad4acc13b25059fd9b32a77a7134c2225db8174276fdadd141a7e9a5ea","sha256:4a7ada73322bc7fcb62a8892e296416b4d0fd168580943e47241876aff036c88"],"state_sha256":"01af992b34c8ae4c5fa5a9af4fd40038dcdb9fcf2460536a1b4a2aa4f12a7440"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Losni6USberQaImyJSUpE/0g5R4fxmNY/8Z+0/WxBn91ohO6QbBLo0eKFZmFDcdmIh/4GejdtgiRtUp4FHIJBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-12T13:15:51.664755Z","bundle_sha256":"57219d717dd9beb9961da29dc4651640de55f7fe20c4bdd5aaa3e4e57e92b227"}}