{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:W3ALIM2VQMJOOHTSI5LNHHUCWA","short_pith_number":"pith:W3ALIM2V","canonical_record":{"source":{"id":"2503.10769","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-03-13T18:03:47Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"767f15d5c0513671e50e0fdb39dbdec6aa201a95138d4980305eceddcedbabd0","abstract_canon_sha256":"de3bc845cd4c80f8917b733745bc3da7f12d68d1a8bbbe3f301c0cbecf87238b"},"schema_version":"1.0"},"canonical_sha256":"b6c0b433558312e71e724756d39e82b00c01ac476051dc1da4ef36b082d85fab","source":{"kind":"arxiv","id":"2503.10769","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.10769","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"arxiv_version","alias_value":"2503.10769v1","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.10769","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_12","alias_value":"W3ALIM2VQMJO","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_16","alias_value":"W3ALIM2VQMJOOHTS","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_8","alias_value":"W3ALIM2V","created_at":"2026-07-05T10:42:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:W3ALIM2VQMJOOHTSI5LNHHUCWA","target":"record","payload":{"canonical_record":{"source":{"id":"2503.10769","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-03-13T18:03:47Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"767f15d5c0513671e50e0fdb39dbdec6aa201a95138d4980305eceddcedbabd0","abstract_canon_sha256":"de3bc845cd4c80f8917b733745bc3da7f12d68d1a8bbbe3f301c0cbecf87238b"},"schema_version":"1.0"},"canonical_sha256":"b6c0b433558312e71e724756d39e82b00c01ac476051dc1da4ef36b082d85fab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:42:44.725277Z","signature_b64":"HcDTlKMkby2LSx+mPJ96wiL56nK3HtF17kYOZnfg3+znOYWHNSAa550a4aTzA0YfoUKLX/hW60QpjHzbn5TXBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6c0b433558312e71e724756d39e82b00c01ac476051dc1da4ef36b082d85fab","last_reissued_at":"2026-07-05T10:42:44.724735Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:42:44.724735Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2503.10769","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":"2026-07-05T10:42:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kbXtap5e+4U1l8rJ7re15/ElaTbdeWFQBcbOtQjbgGZIszgaMrR/3G22GgE9Y5YtoS7GeQ3FwOS2eMqcsRIAAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T11:36:31.239245Z"},"content_sha256":"0723bc2531dd980c15c604cb3318fdf7388c216f67887d6f1b77f3b90e93edf2","schema_version":"1.0","event_id":"sha256:0723bc2531dd980c15c604cb3318fdf7388c216f67887d6f1b77f3b90e93edf2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:W3ALIM2VQMJOOHTSI5LNHHUCWA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extremely iron-poor O-type stars in the Magellanic Bridge","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.GA","authors_text":"A.A.C. Sander, E.C. Sch\\\"osser, G. Gonz\\'alez-Tor\\`a, J. Josiek, J.S. Gallagher, L.M. Oskinova, M. Bernini-Peron, R.R. Lefever, V. Ramachandran, W.-R. Hamann","submitted_at":"2025-03-13T18:03:47Z","abstract_excerpt":"To study stars analogous to those in the early Universe with redshift z > 3, we need to probe environments with low metallicities. Until recently, massive O-type stars with metallicities lower than that of the Small Magellanic Cloud (SMC, Z < 20%Z_sol) were only known in compact dwarf galaxies. Observations of stars in such distant galaxies (> 1 Mpc) suffer from limited S/N ratios and spatial resolution. Recently, a few O-type stars were identified in the nearby Magellanic Bridge which offers a unique laboratory with low gas density and metal content. We acquired high-resolution HST-COS FUV sp"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.10769","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/2503.10769/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":"2026-07-05T10:42:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gzeoxygyTbvPiAocHHyad3U2p9DVrDnpHrXd5ASMv2XHfDdw5HCTfiH3TIGGohTTDidc1DHicdua+Y5pnmc+Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-14T11:36:31.240162Z"},"content_sha256":"0bb82e8a56997e7c156f75f5a824f4dc805b43f85c0a4597d3c28e00bd6c4f28","schema_version":"1.0","event_id":"sha256:0bb82e8a56997e7c156f75f5a824f4dc805b43f85c0a4597d3c28e00bd6c4f28"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/bundle.json","state_url":"https://pith.science/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/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":"2026-08-14T11:36:31Z","links":{"resolver":"https://pith.science/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA","bundle":"https://pith.science/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/bundle.json","state":"https://pith.science/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W3ALIM2VQMJOOHTSI5LNHHUCWA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:W3ALIM2VQMJOOHTSI5LNHHUCWA","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":"de3bc845cd4c80f8917b733745bc3da7f12d68d1a8bbbe3f301c0cbecf87238b","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-03-13T18:03:47Z","title_canon_sha256":"767f15d5c0513671e50e0fdb39dbdec6aa201a95138d4980305eceddcedbabd0"},"schema_version":"1.0","source":{"id":"2503.10769","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2503.10769","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"arxiv_version","alias_value":"2503.10769v1","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2503.10769","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_12","alias_value":"W3ALIM2VQMJO","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_16","alias_value":"W3ALIM2VQMJOOHTS","created_at":"2026-07-05T10:42:44Z"},{"alias_kind":"pith_short_8","alias_value":"W3ALIM2V","created_at":"2026-07-05T10:42:44Z"}],"graph_snapshots":[{"event_id":"sha256:0bb82e8a56997e7c156f75f5a824f4dc805b43f85c0a4597d3c28e00bd6c4f28","target":"graph","created_at":"2026-07-05T10:42:44Z","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/2503.10769/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"To study stars analogous to those in the early Universe with redshift z > 3, we need to probe environments with low metallicities. Until recently, massive O-type stars with metallicities lower than that of the Small Magellanic Cloud (SMC, Z < 20%Z_sol) were only known in compact dwarf galaxies. Observations of stars in such distant galaxies (> 1 Mpc) suffer from limited S/N ratios and spatial resolution. Recently, a few O-type stars were identified in the nearby Magellanic Bridge which offers a unique laboratory with low gas density and metal content. We acquired high-resolution HST-COS FUV sp","authors_text":"A.A.C. Sander, E.C. Sch\\\"osser, G. Gonz\\'alez-Tor\\`a, J. Josiek, J.S. Gallagher, L.M. Oskinova, M. Bernini-Peron, R.R. Lefever, V. Ramachandran, W.-R. Hamann","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-03-13T18:03:47Z","title":"Extremely iron-poor O-type stars in the Magellanic Bridge"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2503.10769","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":"sha256:0723bc2531dd980c15c604cb3318fdf7388c216f67887d6f1b77f3b90e93edf2","target":"record","created_at":"2026-07-05T10:42:44Z","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":"de3bc845cd4c80f8917b733745bc3da7f12d68d1a8bbbe3f301c0cbecf87238b","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2025-03-13T18:03:47Z","title_canon_sha256":"767f15d5c0513671e50e0fdb39dbdec6aa201a95138d4980305eceddcedbabd0"},"schema_version":"1.0","source":{"id":"2503.10769","kind":"arxiv","version":1}},"canonical_sha256":"b6c0b433558312e71e724756d39e82b00c01ac476051dc1da4ef36b082d85fab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6c0b433558312e71e724756d39e82b00c01ac476051dc1da4ef36b082d85fab","first_computed_at":"2026-07-05T10:42:44.724735Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:42:44.724735Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HcDTlKMkby2LSx+mPJ96wiL56nK3HtF17kYOZnfg3+znOYWHNSAa550a4aTzA0YfoUKLX/hW60QpjHzbn5TXBw==","signature_status":"signed_v1","signed_at":"2026-07-05T10:42:44.725277Z","signed_message":"canonical_sha256_bytes"},"source_id":"2503.10769","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0723bc2531dd980c15c604cb3318fdf7388c216f67887d6f1b77f3b90e93edf2","sha256:0bb82e8a56997e7c156f75f5a824f4dc805b43f85c0a4597d3c28e00bd6c4f28"],"state_sha256":"065c71a0ca7b4df22d59e9038885a0441d205d7d81c9da97d6351b4539209559"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9D/XRGZItQjyKHbzvT8FJfMzByoBwMDEezXlyDjUAAMbLxumuEMgWe+cMKFG4ehkqiPLEEWBePf/bgbe+mfMBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-14T11:36:31.247063Z","bundle_sha256":"fd3ca22701fd20103470649adb8f54e2296839953a7b13c339ff9d3a17dd4b8d"}}