{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:MQXF7VP53IYO4SAAXF4UKA22RM","short_pith_number":"pith:MQXF7VP5","canonical_record":{"source":{"id":"1705.10280","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-05-29T16:26:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"563c5235e856ddaaf92a86539e436e431730713e92584a3a43faa612e3c80eb5","abstract_canon_sha256":"bdc948a69492a2a5a838ac72dbdcda240bbb842dd6d4ab849d54aa25f3b81f5f"},"schema_version":"1.0"},"canonical_sha256":"642e5fd5fdda30ee4800b97945035a8b32b9612718dbb03e7fd1e32ff92b5369","source":{"kind":"arxiv","id":"1705.10280","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.10280","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"arxiv_version","alias_value":"1705.10280v1","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.10280","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"pith_short_12","alias_value":"MQXF7VP53IYO","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"MQXF7VP53IYO4SAA","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"MQXF7VP5","created_at":"2026-05-18T12:31:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:MQXF7VP53IYO4SAAXF4UKA22RM","target":"record","payload":{"canonical_record":{"source":{"id":"1705.10280","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-05-29T16:26:36Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"563c5235e856ddaaf92a86539e436e431730713e92584a3a43faa612e3c80eb5","abstract_canon_sha256":"bdc948a69492a2a5a838ac72dbdcda240bbb842dd6d4ab849d54aa25f3b81f5f"},"schema_version":"1.0"},"canonical_sha256":"642e5fd5fdda30ee4800b97945035a8b32b9612718dbb03e7fd1e32ff92b5369","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:36:03.199790Z","signature_b64":"mfgWL0VfJssFKkQwWFFxCFwfyul/wGnpneT6d1dToD86r2n6XORy+5p/CZJIas7ZWw5olzkLughyC3l52Rd3AA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"642e5fd5fdda30ee4800b97945035a8b32b9612718dbb03e7fd1e32ff92b5369","last_reissued_at":"2026-05-18T00:36:03.199415Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:36:03.199415Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.10280","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":"2026-05-18T00:36:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+eD+vhn+a3QgWACso5cByRfxjuE9qf4J7ZlBswQKbqEKo6PVUz9i7+W0cpSgE+s3oYradT0XZ7X8hOTDzItCAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T07:40:55.340257Z"},"content_sha256":"93d98a2904f4b55ae07e836cee9df20cdccbeec297925116926b9c284f1cd6d9","schema_version":"1.0","event_id":"sha256:93d98a2904f4b55ae07e836cee9df20cdccbeec297925116926b9c284f1cd6d9"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:MQXF7VP53IYO4SAAXF4UKA22RM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Pristine survey II: a sample of bright stars observed with FEROS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. A. Henden, C. Allende Prieto, D. S. Aguado, E. Caffau, E. Starkenburg, J. I. Gonzalez Hernandez, K. Venn, K. Youakim, N. Martin, P. Bonifacio, P. Jablonka","submitted_at":"2017-05-29T16:26:36Z","abstract_excerpt":"Extremely metal-poor (EMP) stars are old objects formed in the first Gyr of the Universe. They are rare and, to select them, the most successful strategy has been to build on large and low-resolution spectroscopic surveys. The combination of narrow- and broad band photometry provides a powerful and cheaper alternative to select metal-poor stars. The on-going Pristine Survey is adopting this strategy, conducting photometry with the CFHT MegaCam wide field imager and a narrow-band filter centred at 395.2 nm on the CaII-H and -K lines. In this paper we present the results of the spectroscopic fol"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.10280","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":"2026-05-18T00:36:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cqITv4k8zpeVLHwdnkdEXN4MZoUc67S25eMBGKb3LDGhOVIC1MvPeMNq9IoR8w575vNHgnBsYiKSEhpjp7HDBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T07:40:55.340919Z"},"content_sha256":"2a51c20f8a16c65af4ca43fc1c8292efccdba68fd3c5f299e6ac17cd9117e477","schema_version":"1.0","event_id":"sha256:2a51c20f8a16c65af4ca43fc1c8292efccdba68fd3c5f299e6ac17cd9117e477"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MQXF7VP53IYO4SAAXF4UKA22RM/bundle.json","state_url":"https://pith.science/pith/MQXF7VP53IYO4SAAXF4UKA22RM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MQXF7VP53IYO4SAAXF4UKA22RM/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":"2026-05-31T07:40:55Z","links":{"resolver":"https://pith.science/pith/MQXF7VP53IYO4SAAXF4UKA22RM","bundle":"https://pith.science/pith/MQXF7VP53IYO4SAAXF4UKA22RM/bundle.json","state":"https://pith.science/pith/MQXF7VP53IYO4SAAXF4UKA22RM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MQXF7VP53IYO4SAAXF4UKA22RM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:MQXF7VP53IYO4SAAXF4UKA22RM","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":"bdc948a69492a2a5a838ac72dbdcda240bbb842dd6d4ab849d54aa25f3b81f5f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-05-29T16:26:36Z","title_canon_sha256":"563c5235e856ddaaf92a86539e436e431730713e92584a3a43faa612e3c80eb5"},"schema_version":"1.0","source":{"id":"1705.10280","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.10280","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"arxiv_version","alias_value":"1705.10280v1","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.10280","created_at":"2026-05-18T00:36:03Z"},{"alias_kind":"pith_short_12","alias_value":"MQXF7VP53IYO","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_16","alias_value":"MQXF7VP53IYO4SAA","created_at":"2026-05-18T12:31:31Z"},{"alias_kind":"pith_short_8","alias_value":"MQXF7VP5","created_at":"2026-05-18T12:31:31Z"}],"graph_snapshots":[{"event_id":"sha256:2a51c20f8a16c65af4ca43fc1c8292efccdba68fd3c5f299e6ac17cd9117e477","target":"graph","created_at":"2026-05-18T00:36:03Z","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":"Extremely metal-poor (EMP) stars are old objects formed in the first Gyr of the Universe. They are rare and, to select them, the most successful strategy has been to build on large and low-resolution spectroscopic surveys. The combination of narrow- and broad band photometry provides a powerful and cheaper alternative to select metal-poor stars. The on-going Pristine Survey is adopting this strategy, conducting photometry with the CFHT MegaCam wide field imager and a narrow-band filter centred at 395.2 nm on the CaII-H and -K lines. In this paper we present the results of the spectroscopic fol","authors_text":"A. A. Henden, C. Allende Prieto, D. S. Aguado, E. Caffau, E. Starkenburg, J. I. Gonzalez Hernandez, K. Venn, K. Youakim, N. Martin, P. Bonifacio, P. Jablonka","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-05-29T16:26:36Z","title":"The Pristine survey II: a sample of bright stars observed with FEROS"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.10280","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":"sha256:93d98a2904f4b55ae07e836cee9df20cdccbeec297925116926b9c284f1cd6d9","target":"record","created_at":"2026-05-18T00:36:03Z","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":"bdc948a69492a2a5a838ac72dbdcda240bbb842dd6d4ab849d54aa25f3b81f5f","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2017-05-29T16:26:36Z","title_canon_sha256":"563c5235e856ddaaf92a86539e436e431730713e92584a3a43faa612e3c80eb5"},"schema_version":"1.0","source":{"id":"1705.10280","kind":"arxiv","version":1}},"canonical_sha256":"642e5fd5fdda30ee4800b97945035a8b32b9612718dbb03e7fd1e32ff92b5369","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"642e5fd5fdda30ee4800b97945035a8b32b9612718dbb03e7fd1e32ff92b5369","first_computed_at":"2026-05-18T00:36:03.199415Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:36:03.199415Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mfgWL0VfJssFKkQwWFFxCFwfyul/wGnpneT6d1dToD86r2n6XORy+5p/CZJIas7ZWw5olzkLughyC3l52Rd3AA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:36:03.199790Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.10280","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:93d98a2904f4b55ae07e836cee9df20cdccbeec297925116926b9c284f1cd6d9","sha256:2a51c20f8a16c65af4ca43fc1c8292efccdba68fd3c5f299e6ac17cd9117e477"],"state_sha256":"584b3d185c730cca08679fd479e5145296483de099833461a000f060fae6b876"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wgou7/rjQFWcVcBu8dcJq5JIcfcQRa/AKYRnPoTfq4umLl6Ur5+Zz7dLk3elE+j/h93nE8GiSXAGHcw9ShSTDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T07:40:55.343815Z","bundle_sha256":"bc37d3271f0d0ae131a5c0be41f901c396acec5275ad573774f8fa59281ad706"}}