{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:QVZPKAOIOSU5MCJUE3I4NAWAD3","short_pith_number":"pith:QVZPKAOI","canonical_record":{"source":{"id":"1201.5145","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-01-24T22:24:06Z","cross_cats_sorted":[],"title_canon_sha256":"b17fa6ec673ab3d9b7397fae439a55cb59a303021f303352eb4db15a386a8991","abstract_canon_sha256":"02d036fccc5635b1023f90433a112fcb4f2422eb06c5a09c9133abb8d5660a8a"},"schema_version":"1.0"},"canonical_sha256":"8572f501c874a9d6093426d1c682c01edf2acb3cea8b4201a44d4714dd5b07f5","source":{"kind":"arxiv","id":"1201.5145","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.5145","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"arxiv_version","alias_value":"1201.5145v1","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.5145","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"pith_short_12","alias_value":"QVZPKAOIOSU5","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"QVZPKAOIOSU5MCJU","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"QVZPKAOI","created_at":"2026-05-18T12:27:20Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:QVZPKAOIOSU5MCJUE3I4NAWAD3","target":"record","payload":{"canonical_record":{"source":{"id":"1201.5145","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-01-24T22:24:06Z","cross_cats_sorted":[],"title_canon_sha256":"b17fa6ec673ab3d9b7397fae439a55cb59a303021f303352eb4db15a386a8991","abstract_canon_sha256":"02d036fccc5635b1023f90433a112fcb4f2422eb06c5a09c9133abb8d5660a8a"},"schema_version":"1.0"},"canonical_sha256":"8572f501c874a9d6093426d1c682c01edf2acb3cea8b4201a44d4714dd5b07f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:36:25.275796Z","signature_b64":"DrX3RKdZgE2A00r9ih4l5i0P+ZjTboS6kRZT1EUZ3TGk6nEy2Vc8wAWfkssA0YmLsDQuhNI0t87+TUCfb+uQBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"8572f501c874a9d6093426d1c682c01edf2acb3cea8b4201a44d4714dd5b07f5","last_reissued_at":"2026-05-18T03:36:25.275408Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:36:25.275408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1201.5145","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":"2026-05-18T03:36:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YvsqAVvjm6slCsbP/1WAzze4XnFHJUdKJB0r/zkvHwBAx5OTmc3SSaL7iisURhjnzv+75M99elhjKXR23ad4BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:22:52.711411Z"},"content_sha256":"3a356af9d99f9785617ebf4ff338157ae592a38a99c7635cf914c00e288bdca3","schema_version":"1.0","event_id":"sha256:3a356af9d99f9785617ebf4ff338157ae592a38a99c7635cf914c00e288bdca3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:QVZPKAOIOSU5MCJUE3I4NAWAD3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"First VLT/X-shooter spectroscopy of early-type stars outside the Local Group","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"Alex de Koter, Hugues Sana, Lex Kaper, Olga Hartoog","submitted_at":"2012-01-24T22:24:06Z","abstract_excerpt":"As part of the VLT/X-shooter science verification, we obtained the first optical medium-resolution spectrum of a previously identified bright O-type object in NGC55, an LMC-like galaxy at a distance of \\sim2.0 Mpc. Based on the stellar and nebular spectrum, we investigate the nature and evolutionary status of the central object(s) and its influence on the surrounding interstellar medium. We conclude that the source, NGC55_C1_31, is a composite object, likely a stellar cluster, which contains one or several hot (T_eff \\simeq 50000 K) WN stars with a high mass-loss rate (\\sim3 \\times 10^{-5} M_\\"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.5145","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":"2026-05-18T03:36:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iQUCnb7sQbDJahXdtlVg7IDZM/G6snd1H3nKdDp0uzHIUzHR+aKxecVVvx4HEBFPLoyLtO73Tk+Xrjj9xrGPCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T12:22:52.711820Z"},"content_sha256":"5141eab7262e174031009e629026bc1ae9bbe6ecbc391b05dbb9bd374eb8e85c","schema_version":"1.0","event_id":"sha256:5141eab7262e174031009e629026bc1ae9bbe6ecbc391b05dbb9bd374eb8e85c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/bundle.json","state_url":"https://pith.science/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/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":"2026-05-25T12:22:52Z","links":{"resolver":"https://pith.science/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3","bundle":"https://pith.science/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/bundle.json","state":"https://pith.science/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/QVZPKAOIOSU5MCJUE3I4NAWAD3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:QVZPKAOIOSU5MCJUE3I4NAWAD3","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":"02d036fccc5635b1023f90433a112fcb4f2422eb06c5a09c9133abb8d5660a8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-01-24T22:24:06Z","title_canon_sha256":"b17fa6ec673ab3d9b7397fae439a55cb59a303021f303352eb4db15a386a8991"},"schema_version":"1.0","source":{"id":"1201.5145","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1201.5145","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"arxiv_version","alias_value":"1201.5145v1","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1201.5145","created_at":"2026-05-18T03:36:25Z"},{"alias_kind":"pith_short_12","alias_value":"QVZPKAOIOSU5","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_16","alias_value":"QVZPKAOIOSU5MCJU","created_at":"2026-05-18T12:27:20Z"},{"alias_kind":"pith_short_8","alias_value":"QVZPKAOI","created_at":"2026-05-18T12:27:20Z"}],"graph_snapshots":[{"event_id":"sha256:5141eab7262e174031009e629026bc1ae9bbe6ecbc391b05dbb9bd374eb8e85c","target":"graph","created_at":"2026-05-18T03:36:25Z","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":"As part of the VLT/X-shooter science verification, we obtained the first optical medium-resolution spectrum of a previously identified bright O-type object in NGC55, an LMC-like galaxy at a distance of \\sim2.0 Mpc. Based on the stellar and nebular spectrum, we investigate the nature and evolutionary status of the central object(s) and its influence on the surrounding interstellar medium. We conclude that the source, NGC55_C1_31, is a composite object, likely a stellar cluster, which contains one or several hot (T_eff \\simeq 50000 K) WN stars with a high mass-loss rate (\\sim3 \\times 10^{-5} M_\\","authors_text":"Alex de Koter, Hugues Sana, Lex Kaper, Olga Hartoog","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-01-24T22:24:06Z","title":"First VLT/X-shooter spectroscopy of early-type stars outside the Local Group"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1201.5145","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":"sha256:3a356af9d99f9785617ebf4ff338157ae592a38a99c7635cf914c00e288bdca3","target":"record","created_at":"2026-05-18T03:36:25Z","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":"02d036fccc5635b1023f90433a112fcb4f2422eb06c5a09c9133abb8d5660a8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2012-01-24T22:24:06Z","title_canon_sha256":"b17fa6ec673ab3d9b7397fae439a55cb59a303021f303352eb4db15a386a8991"},"schema_version":"1.0","source":{"id":"1201.5145","kind":"arxiv","version":1}},"canonical_sha256":"8572f501c874a9d6093426d1c682c01edf2acb3cea8b4201a44d4714dd5b07f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"8572f501c874a9d6093426d1c682c01edf2acb3cea8b4201a44d4714dd5b07f5","first_computed_at":"2026-05-18T03:36:25.275408Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:36:25.275408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DrX3RKdZgE2A00r9ih4l5i0P+ZjTboS6kRZT1EUZ3TGk6nEy2Vc8wAWfkssA0YmLsDQuhNI0t87+TUCfb+uQBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:36:25.275796Z","signed_message":"canonical_sha256_bytes"},"source_id":"1201.5145","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3a356af9d99f9785617ebf4ff338157ae592a38a99c7635cf914c00e288bdca3","sha256:5141eab7262e174031009e629026bc1ae9bbe6ecbc391b05dbb9bd374eb8e85c"],"state_sha256":"f7eec0316517f340f82bc5cb4ed22d8d09e4366a246859c6dbbb0d33726f18b5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tY2PvkObgrNhXoBJlzk/uBRma2ElvZcICFXpED8odbi9iEA9shgTQkSzCdqpoehzRhVgteVnBrc7uTeKkBXrBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T12:22:52.714822Z","bundle_sha256":"4fe4e8ac2c60ec00a3b4536f49d34751242cfcd6b789b562e202db00c7d297a0"}}