{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:XINZYGAL33XFBGRPIMJZJHQXNR","short_pith_number":"pith:XINZYGAL","canonical_record":{"source":{"id":"1810.06577","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-15T18:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"d7bdc1260273bcdffc9db622e0606843c4d3898eb7a9b96a320bc541f1159a5f","abstract_canon_sha256":"7c8a664766586ad4c034d6aada50d8b54983c955eb8e1a6bba915fa0d549a02d"},"schema_version":"1.0"},"canonical_sha256":"ba1b9c180bdeee509a2f4313949e176c720675f4b5a6145622c97cef8dddfd20","source":{"kind":"arxiv","id":"1810.06577","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06577","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06577v1","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06577","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"pith_short_12","alias_value":"XINZYGAL33XF","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XINZYGAL33XFBGRP","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XINZYGAL","created_at":"2026-05-18T12:33:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:XINZYGAL33XFBGRPIMJZJHQXNR","target":"record","payload":{"canonical_record":{"source":{"id":"1810.06577","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-15T18:00:10Z","cross_cats_sorted":[],"title_canon_sha256":"d7bdc1260273bcdffc9db622e0606843c4d3898eb7a9b96a320bc541f1159a5f","abstract_canon_sha256":"7c8a664766586ad4c034d6aada50d8b54983c955eb8e1a6bba915fa0d549a02d"},"schema_version":"1.0"},"canonical_sha256":"ba1b9c180bdeee509a2f4313949e176c720675f4b5a6145622c97cef8dddfd20","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:03:14.167725Z","signature_b64":"tRBZkePkXPqtjudmUOk4irTwYJOTq376HBcOInYUYi7Px4qHOIcjgU4o8U10O2D+ochuQiAxR6KpE+ZIGpIxCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ba1b9c180bdeee509a2f4313949e176c720675f4b5a6145622c97cef8dddfd20","last_reissued_at":"2026-05-18T00:03:14.167138Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:03:14.167138Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1810.06577","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":"2026-05-18T00:03:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YfBDJ9z9dDkYEuRM7BgwKTm5ichoRCosudiVa1rbdTj9jpJTxD529gJCRld+Z13XVQPWHZ7loldn7JlbOaNVBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T15:15:49.407463Z"},"content_sha256":"6742dfc94d70903a8ebdcfc69a62f507c70c820ebf2274726f44c6924842efef","schema_version":"1.0","event_id":"sha256:6742dfc94d70903a8ebdcfc69a62f507c70c820ebf2274726f44c6924842efef"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:XINZYGAL33XFBGRPIMJZJHQXNR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"ngVLA: Astrometry and Long Baseline Science","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Laurent Loinard, Mark Reid, Thomas Maccarone","submitted_at":"2018-10-15T18:00:10Z","abstract_excerpt":"Recent advances in VLBI have led to astrometric accuracy exceeding that of the Gaia mission goals. This chapter describes some important astrophysical problems that can be addressed with sub-milliarcsecond imaging and micro-arcsecond astrometry using the ngVLA with long baselines."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06577","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":"2026-05-18T00:03:14Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R+KNZAndZPJIhpqwxx6OXzrUtxXAovkIIh051rWmVQlryYF5v/IazJu9FRrxhoTTLINpPgSlnTDmrPrle3sfCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T15:15:49.407811Z"},"content_sha256":"224ea81f2cb579ff76bbe3e98883dac7639a48d051dc9ace56813f98107dd3c3","schema_version":"1.0","event_id":"sha256:224ea81f2cb579ff76bbe3e98883dac7639a48d051dc9ace56813f98107dd3c3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XINZYGAL33XFBGRPIMJZJHQXNR/bundle.json","state_url":"https://pith.science/pith/XINZYGAL33XFBGRPIMJZJHQXNR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XINZYGAL33XFBGRPIMJZJHQXNR/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":"2026-05-30T15:15:49Z","links":{"resolver":"https://pith.science/pith/XINZYGAL33XFBGRPIMJZJHQXNR","bundle":"https://pith.science/pith/XINZYGAL33XFBGRPIMJZJHQXNR/bundle.json","state":"https://pith.science/pith/XINZYGAL33XFBGRPIMJZJHQXNR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XINZYGAL33XFBGRPIMJZJHQXNR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:XINZYGAL33XFBGRPIMJZJHQXNR","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":"7c8a664766586ad4c034d6aada50d8b54983c955eb8e1a6bba915fa0d549a02d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-15T18:00:10Z","title_canon_sha256":"d7bdc1260273bcdffc9db622e0606843c4d3898eb7a9b96a320bc541f1159a5f"},"schema_version":"1.0","source":{"id":"1810.06577","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.06577","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"arxiv_version","alias_value":"1810.06577v1","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.06577","created_at":"2026-05-18T00:03:14Z"},{"alias_kind":"pith_short_12","alias_value":"XINZYGAL33XF","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_16","alias_value":"XINZYGAL33XFBGRP","created_at":"2026-05-18T12:33:01Z"},{"alias_kind":"pith_short_8","alias_value":"XINZYGAL","created_at":"2026-05-18T12:33:01Z"}],"graph_snapshots":[{"event_id":"sha256:224ea81f2cb579ff76bbe3e98883dac7639a48d051dc9ace56813f98107dd3c3","target":"graph","created_at":"2026-05-18T00:03:14Z","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":"Recent advances in VLBI have led to astrometric accuracy exceeding that of the Gaia mission goals. This chapter describes some important astrophysical problems that can be addressed with sub-milliarcsecond imaging and micro-arcsecond astrometry using the ngVLA with long baselines.","authors_text":"Laurent Loinard, Mark Reid, Thomas Maccarone","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-15T18:00:10Z","title":"ngVLA: Astrometry and Long Baseline Science"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.06577","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":"sha256:6742dfc94d70903a8ebdcfc69a62f507c70c820ebf2274726f44c6924842efef","target":"record","created_at":"2026-05-18T00:03:14Z","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":"7c8a664766586ad4c034d6aada50d8b54983c955eb8e1a6bba915fa0d549a02d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-15T18:00:10Z","title_canon_sha256":"d7bdc1260273bcdffc9db622e0606843c4d3898eb7a9b96a320bc541f1159a5f"},"schema_version":"1.0","source":{"id":"1810.06577","kind":"arxiv","version":1}},"canonical_sha256":"ba1b9c180bdeee509a2f4313949e176c720675f4b5a6145622c97cef8dddfd20","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ba1b9c180bdeee509a2f4313949e176c720675f4b5a6145622c97cef8dddfd20","first_computed_at":"2026-05-18T00:03:14.167138Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:03:14.167138Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"tRBZkePkXPqtjudmUOk4irTwYJOTq376HBcOInYUYi7Px4qHOIcjgU4o8U10O2D+ochuQiAxR6KpE+ZIGpIxCA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:03:14.167725Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.06577","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6742dfc94d70903a8ebdcfc69a62f507c70c820ebf2274726f44c6924842efef","sha256:224ea81f2cb579ff76bbe3e98883dac7639a48d051dc9ace56813f98107dd3c3"],"state_sha256":"5aa9272c9b643c375c6663ab9729961fd25a677b0968ef32aafd2b38f2454729"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CRbnektHnzQzX9sBNQAlVtQTvtbEdOBTxNZz3Wkx9ClPMTI4Bi7PhQfX8bIeP9JoESdeLFiIVa1P94NecB+lAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T15:15:49.409977Z","bundle_sha256":"ef2dae48c73ebe0547f2958b71ae44c4e5110e46bfb7ae6b6b4c8bb2a904d8c4"}}