{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:5CQQ5DDJVJM2LFHDUHSP5ZKN4I","short_pith_number":"pith:5CQQ5DDJ","canonical_record":{"source":{"id":"1804.09575","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-25T13:56:25Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"3b22bd437c9fcda421628a384c4948cb1d7478ccb650f55e7b6ef3bca39d7fd0","abstract_canon_sha256":"41c98fde8a70d544db15a3de3221af9e5f7735dc0109204d4b72f89bca8bb487"},"schema_version":"1.0"},"canonical_sha256":"e8a10e8c69aa59a594e3a1e4fee54de238a8c005cd562c39aca0aa15d2c8af57","source":{"kind":"arxiv","id":"1804.09575","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.09575","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"arxiv_version","alias_value":"1804.09575v2","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.09575","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"pith_short_12","alias_value":"5CQQ5DDJVJM2","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5CQQ5DDJVJM2LFHD","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5CQQ5DDJ","created_at":"2026-05-18T12:32:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:5CQQ5DDJVJM2LFHDUHSP5ZKN4I","target":"record","payload":{"canonical_record":{"source":{"id":"1804.09575","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-25T13:56:25Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"3b22bd437c9fcda421628a384c4948cb1d7478ccb650f55e7b6ef3bca39d7fd0","abstract_canon_sha256":"41c98fde8a70d544db15a3de3221af9e5f7735dc0109204d4b72f89bca8bb487"},"schema_version":"1.0"},"canonical_sha256":"e8a10e8c69aa59a594e3a1e4fee54de238a8c005cd562c39aca0aa15d2c8af57","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:13:59.906568Z","signature_b64":"r0BSaIrI62grqqiGYg4qjkyJ9mgU3gJ9DLd9QtRR523j2xe5t3k3FW4+JKEJ0eWa0TVM4YXGT8PbaHJU7ViYDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e8a10e8c69aa59a594e3a1e4fee54de238a8c005cd562c39aca0aa15d2c8af57","last_reissued_at":"2026-05-18T00:13:59.905903Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:13:59.905903Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1804.09575","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:13:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v6bcu+mWfVWSgRlcTsW8oad/HNogd+9QIfv0OAwQv0NJo8VqH1Ke/0ARf0GurZapE5TJIgEfRPjK4N5WqIloBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T06:02:42.058349Z"},"content_sha256":"f7e819db196e39c891771bc29e79cda57b607f9a7679d5362e59a5fa8fb87a0f","schema_version":"1.0","event_id":"sha256:f7e819db196e39c891771bc29e79cda57b607f9a7679d5362e59a5fa8fb87a0f"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:5CQQ5DDJVJM2LFHDUHSP5ZKN4I","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Gaia, Stellar Populations and the Distance Scale","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Alessia Garofalo, Gisella Clementini, Tatiana Muraveva, Vincenzo Ripepi","submitted_at":"2018-04-25T13:56:25Z","abstract_excerpt":"We discuss the impact that Gaia, a European Space Agency (ESA) cornerstone mission that has been in scientific operations since July 2014, is expected to have on the definition of the cosmic distance ladder and the study of resolved stellar populations in and beyond the Milky Way, specifically focusing on results based on Cepheids and RR Lyrae stars. Gaia is observing about 1.7 billion sources, measuring their position, trigonometric parallax, proper motions and time-series photometry in 3 pass-bands down to a faint magnitude limit of G $\\sim$21 mag. Among them are thousands of Cepheids and hu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.09575","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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:13:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wHXsiahQmnGZYZe2QoNRUa3q4cFEDzL81KWBcFK+iKeqUgks8wzwZj2cggwI/O4H2vxj+GzOXlUReRRjVD1xBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T06:02:42.058710Z"},"content_sha256":"ee53a9e35f865506fb97ff723e5097a621fa3b0c79ef2ea6a429879158cb3757","schema_version":"1.0","event_id":"sha256:ee53a9e35f865506fb97ff723e5097a621fa3b0c79ef2ea6a429879158cb3757"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/bundle.json","state_url":"https://pith.science/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/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":"2026-05-26T06:02:42Z","links":{"resolver":"https://pith.science/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I","bundle":"https://pith.science/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/bundle.json","state":"https://pith.science/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5CQQ5DDJVJM2LFHDUHSP5ZKN4I/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:5CQQ5DDJVJM2LFHDUHSP5ZKN4I","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":"41c98fde8a70d544db15a3de3221af9e5f7735dc0109204d4b72f89bca8bb487","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-25T13:56:25Z","title_canon_sha256":"3b22bd437c9fcda421628a384c4948cb1d7478ccb650f55e7b6ef3bca39d7fd0"},"schema_version":"1.0","source":{"id":"1804.09575","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1804.09575","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"arxiv_version","alias_value":"1804.09575v2","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1804.09575","created_at":"2026-05-18T00:13:59Z"},{"alias_kind":"pith_short_12","alias_value":"5CQQ5DDJVJM2","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_16","alias_value":"5CQQ5DDJVJM2LFHD","created_at":"2026-05-18T12:32:08Z"},{"alias_kind":"pith_short_8","alias_value":"5CQQ5DDJ","created_at":"2026-05-18T12:32:08Z"}],"graph_snapshots":[{"event_id":"sha256:ee53a9e35f865506fb97ff723e5097a621fa3b0c79ef2ea6a429879158cb3757","target":"graph","created_at":"2026-05-18T00:13:59Z","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":"We discuss the impact that Gaia, a European Space Agency (ESA) cornerstone mission that has been in scientific operations since July 2014, is expected to have on the definition of the cosmic distance ladder and the study of resolved stellar populations in and beyond the Milky Way, specifically focusing on results based on Cepheids and RR Lyrae stars. Gaia is observing about 1.7 billion sources, measuring their position, trigonometric parallax, proper motions and time-series photometry in 3 pass-bands down to a faint magnitude limit of G $\\sim$21 mag. Among them are thousands of Cepheids and hu","authors_text":"Alessia Garofalo, Gisella Clementini, Tatiana Muraveva, Vincenzo Ripepi","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-25T13:56:25Z","title":"Gaia, Stellar Populations and the Distance Scale"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1804.09575","kind":"arxiv","version":2},"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:f7e819db196e39c891771bc29e79cda57b607f9a7679d5362e59a5fa8fb87a0f","target":"record","created_at":"2026-05-18T00:13:59Z","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":"41c98fde8a70d544db15a3de3221af9e5f7735dc0109204d4b72f89bca8bb487","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-04-25T13:56:25Z","title_canon_sha256":"3b22bd437c9fcda421628a384c4948cb1d7478ccb650f55e7b6ef3bca39d7fd0"},"schema_version":"1.0","source":{"id":"1804.09575","kind":"arxiv","version":2}},"canonical_sha256":"e8a10e8c69aa59a594e3a1e4fee54de238a8c005cd562c39aca0aa15d2c8af57","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e8a10e8c69aa59a594e3a1e4fee54de238a8c005cd562c39aca0aa15d2c8af57","first_computed_at":"2026-05-18T00:13:59.905903Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:13:59.905903Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"r0BSaIrI62grqqiGYg4qjkyJ9mgU3gJ9DLd9QtRR523j2xe5t3k3FW4+JKEJ0eWa0TVM4YXGT8PbaHJU7ViYDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:13:59.906568Z","signed_message":"canonical_sha256_bytes"},"source_id":"1804.09575","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f7e819db196e39c891771bc29e79cda57b607f9a7679d5362e59a5fa8fb87a0f","sha256:ee53a9e35f865506fb97ff723e5097a621fa3b0c79ef2ea6a429879158cb3757"],"state_sha256":"822b6e04cfcd0ee998f23c329efd39820dc877dfee4a07383c3c1bb443da1da5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Ri5gXUc0CWfgeHH8BvwTsLKgkPcmzL0ZcfbMjnysmUtfOGR4dbfeTtwpBoijf5/hJpBqZrttB2PEPGXTl/pFBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T06:02:42.061441Z","bundle_sha256":"4372dd9f776560b4fc48cb459e148f6561fbd460e33896182b78448473c283f3"}}