{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2017:JBEZUZY3YXHVVPYFJYL6S7ARWN","short_pith_number":"pith:JBEZUZY3","schema_version":"1.0","canonical_sha256":"48499a671bc5cf5abf054e17e97c11b3412965e1c9070e1527990ce3c988486e","source":{"kind":"arxiv","id":"1704.03316","version":2},"attestation_state":"computed","paper":{"title":"Pulsar Positioning System: A quest for evidence of extraterrestrial engineering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.pop-ph","authors_text":"Clement Vidal","submitted_at":"2017-04-05T13:33:17Z","abstract_excerpt":"Pulsars have at least two impressive applications. First, they can be used as highly accurate clocks, comparable in stability to atomic clocks; secondly, a small subset of pulsars, millisecond X-ray pulsars, provide all the necessary ingredients for a passive galactic positioning system. This is known in astronautics as X-ray pulsar-based navigation (XNAV). XNAV is comparable to GPS, except that it operates on a galactic scale. I propose a SETI-XNAV research program to test the hypothesis that this pulsar positioning system might be an instance of galactic-scale engineering by extraterrestrial"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1704.03316","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.pop-ph","submitted_at":"2017-04-05T13:33:17Z","cross_cats_sorted":[],"title_canon_sha256":"d6962648260711ac1906d4a8d9347d77e1c6e19e1b851f2e3eba255d32884ea6","abstract_canon_sha256":"17bae49f7fa09d50aa95f06dbd45088d75fedccc5e7deab642fa46c2bb4f9da8"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:29:39.211098Z","signature_b64":"BYGViT0pNdP+SXbAnPXjDuYnorQGwJ+bu0HXGgY1wmop256NK5pwXamKwZh0PRdHb1d4J+oGWQmyZxviOaheAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"48499a671bc5cf5abf054e17e97c11b3412965e1c9070e1527990ce3c988486e","last_reissued_at":"2026-05-18T00:29:39.210629Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:29:39.210629Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Pulsar Positioning System: A quest for evidence of extraterrestrial engineering","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.pop-ph","authors_text":"Clement Vidal","submitted_at":"2017-04-05T13:33:17Z","abstract_excerpt":"Pulsars have at least two impressive applications. First, they can be used as highly accurate clocks, comparable in stability to atomic clocks; secondly, a small subset of pulsars, millisecond X-ray pulsars, provide all the necessary ingredients for a passive galactic positioning system. This is known in astronautics as X-ray pulsar-based navigation (XNAV). XNAV is comparable to GPS, except that it operates on a galactic scale. I propose a SETI-XNAV research program to test the hypothesis that this pulsar positioning system might be an instance of galactic-scale engineering by extraterrestrial"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1704.03316","kind":"arxiv","version":2},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1704.03316","created_at":"2026-05-18T00:29:39.210722+00:00"},{"alias_kind":"arxiv_version","alias_value":"1704.03316v2","created_at":"2026-05-18T00:29:39.210722+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1704.03316","created_at":"2026-05-18T00:29:39.210722+00:00"},{"alias_kind":"pith_short_12","alias_value":"JBEZUZY3YXHV","created_at":"2026-05-18T12:31:21.493067+00:00"},{"alias_kind":"pith_short_16","alias_value":"JBEZUZY3YXHVVPYF","created_at":"2026-05-18T12:31:21.493067+00:00"},{"alias_kind":"pith_short_8","alias_value":"JBEZUZY3","created_at":"2026-05-18T12:31:21.493067+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN","json":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN.json","graph_json":"https://pith.science/api/pith-number/JBEZUZY3YXHVVPYFJYL6S7ARWN/graph.json","events_json":"https://pith.science/api/pith-number/JBEZUZY3YXHVVPYFJYL6S7ARWN/events.json","paper":"https://pith.science/paper/JBEZUZY3"},"agent_actions":{"view_html":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN","download_json":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN.json","view_paper":"https://pith.science/paper/JBEZUZY3","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1704.03316&json=true","fetch_graph":"https://pith.science/api/pith-number/JBEZUZY3YXHVVPYFJYL6S7ARWN/graph.json","fetch_events":"https://pith.science/api/pith-number/JBEZUZY3YXHVVPYFJYL6S7ARWN/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN/action/timestamp_anchor","attest_storage":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN/action/storage_attestation","attest_author":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN/action/author_attestation","sign_citation":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN/action/citation_signature","submit_replication":"https://pith.science/pith/JBEZUZY3YXHVVPYFJYL6S7ARWN/action/replication_record"}},"created_at":"2026-05-18T00:29:39.210722+00:00","updated_at":"2026-05-18T00:29:39.210722+00:00"}