{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2003:5335272O52AYNWYN3AMDWWVCV2","short_pith_number":"pith:5335272O","canonical_record":{"source":{"id":"astro-ph/0304025","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-01T16:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"0a6664d5f2a311c4f8d86ac981b61ce7e0d7abc917ebf0db6200058210134a8c","abstract_canon_sha256":"677441a54cadbdb757e9b081edd172530d1584dc03e8676944c2276cf8f07ff6"},"schema_version":"1.0"},"canonical_sha256":"eef7dd7f4eee8186db0dd8183b5aa2aeae3cb28c83abd4c8b4ded977621cc73b","source":{"kind":"arxiv","id":"astro-ph/0304025","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0304025","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0304025v1","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0304025","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_12","alias_value":"5335272O52AY","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_16","alias_value":"5335272O52AYNWYN","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_8","alias_value":"5335272O","created_at":"2026-07-04T16:36:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2003:5335272O52AYNWYN3AMDWWVCV2","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0304025","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-01T16:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"0a6664d5f2a311c4f8d86ac981b61ce7e0d7abc917ebf0db6200058210134a8c","abstract_canon_sha256":"677441a54cadbdb757e9b081edd172530d1584dc03e8676944c2276cf8f07ff6"},"schema_version":"1.0"},"canonical_sha256":"eef7dd7f4eee8186db0dd8183b5aa2aeae3cb28c83abd4c8b4ded977621cc73b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:36:46.620012Z","signature_b64":"kHS923mnmETadOIvYkhgcdyjpS/W8PGHziGuG9q9fho9PycAVxjYJF+pxSM1hSnrJU/uus99huIBjoEXbhpGCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"eef7dd7f4eee8186db0dd8183b5aa2aeae3cb28c83abd4c8b4ded977621cc73b","last_reissued_at":"2026-07-04T16:36:46.619536Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:36:46.619536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0304025","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":"2026-07-04T16:36:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UzQqILVblMaWI9YCxXTQf8gcOWHYmydSheKvSj5AB6Le4apBNJ1kV6LQeqaUKfBVBui8WFKs6/7G4+Sby81CDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T21:30:33.611612Z"},"content_sha256":"bce535604d92f7c676776ea7f2df3c6cb7828a4ea57091289bbe9f0a99b24237","schema_version":"1.0","event_id":"sha256:bce535604d92f7c676776ea7f2df3c6cb7828a4ea57091289bbe9f0a99b24237"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2003:5335272O52AYNWYN3AMDWWVCV2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Adolf N. Witt, D.C.B. Whittet, F. Salama, Geoffrey C. Clayton, Karl D. Gordon, L.J. Allamandola, Michael J. Wolff, Peter G. Martin, T. P. Snow, Tracy L. Smith","submitted_at":"2003-04-01T16:11:36Z","abstract_excerpt":"We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produced by polycyclic aromatic hydrocarbons (PAHs). The presence of these molecules in the interstellar medium has been postulated to explain the infrared emission features seen in the 3-13 $\\mu$m spectra of numerous sources. UV spectra are uniquely capable of identifying specific PAH molecules. We obtained high S/N UV spectra of stars which are significantly more reddened than those observed in previous studies. These dat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0304025","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/astro-ph/0304025/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":"2026-07-04T16:36:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4RLrIweSFTaO9pR5Vf3pLDG7TbIcrXUscEhiI+N1UcR8AcAf6SXhchwbubXFd74LATuXdywgxTr7U/nhfsLzCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T21:30:33.612022Z"},"content_sha256":"6a9faadd2ed2a1cbc716249ad311183bb22d7f88c812dcb49aa5ee83efd47f34","schema_version":"1.0","event_id":"sha256:6a9faadd2ed2a1cbc716249ad311183bb22d7f88c812dcb49aa5ee83efd47f34"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5335272O52AYNWYN3AMDWWVCV2/bundle.json","state_url":"https://pith.science/pith/5335272O52AYNWYN3AMDWWVCV2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5335272O52AYNWYN3AMDWWVCV2/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":"2026-08-05T21:30:33Z","links":{"resolver":"https://pith.science/pith/5335272O52AYNWYN3AMDWWVCV2","bundle":"https://pith.science/pith/5335272O52AYNWYN3AMDWWVCV2/bundle.json","state":"https://pith.science/pith/5335272O52AYNWYN3AMDWWVCV2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5335272O52AYNWYN3AMDWWVCV2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2003:5335272O52AYNWYN3AMDWWVCV2","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":"677441a54cadbdb757e9b081edd172530d1584dc03e8676944c2276cf8f07ff6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-01T16:11:36Z","title_canon_sha256":"0a6664d5f2a311c4f8d86ac981b61ce7e0d7abc917ebf0db6200058210134a8c"},"schema_version":"1.0","source":{"id":"astro-ph/0304025","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0304025","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0304025v1","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0304025","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_12","alias_value":"5335272O52AY","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_16","alias_value":"5335272O52AYNWYN","created_at":"2026-07-04T16:36:46Z"},{"alias_kind":"pith_short_8","alias_value":"5335272O","created_at":"2026-07-04T16:36:46Z"}],"graph_snapshots":[{"event_id":"sha256:6a9faadd2ed2a1cbc716249ad311183bb22d7f88c812dcb49aa5ee83efd47f34","target":"graph","created_at":"2026-07-04T16:36:46Z","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/astro-ph/0304025/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We have obtained new STIS/HST spectra to search for structure in the ultraviolet interstellar extinction curve, with particular emphasis on a search for absorption features produced by polycyclic aromatic hydrocarbons (PAHs). The presence of these molecules in the interstellar medium has been postulated to explain the infrared emission features seen in the 3-13 $\\mu$m spectra of numerous sources. UV spectra are uniquely capable of identifying specific PAH molecules. We obtained high S/N UV spectra of stars which are significantly more reddened than those observed in previous studies. These dat","authors_text":"Adolf N. Witt, D.C.B. Whittet, F. Salama, Geoffrey C. Clayton, Karl D. Gordon, L.J. Allamandola, Michael J. Wolff, Peter G. Martin, T. P. Snow, Tracy L. Smith","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2003-04-01T16:11:36Z","title":"The Role of Polycyclic Aromatic Hydrocarbons in Ultraviolet Extinction. I. Probing small molecular PAHs"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0304025","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:bce535604d92f7c676776ea7f2df3c6cb7828a4ea57091289bbe9f0a99b24237","target":"record","created_at":"2026-07-04T16:36:46Z","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":"677441a54cadbdb757e9b081edd172530d1584dc03e8676944c2276cf8f07ff6","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2003-04-01T16:11:36Z","title_canon_sha256":"0a6664d5f2a311c4f8d86ac981b61ce7e0d7abc917ebf0db6200058210134a8c"},"schema_version":"1.0","source":{"id":"astro-ph/0304025","kind":"arxiv","version":1}},"canonical_sha256":"eef7dd7f4eee8186db0dd8183b5aa2aeae3cb28c83abd4c8b4ded977621cc73b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"eef7dd7f4eee8186db0dd8183b5aa2aeae3cb28c83abd4c8b4ded977621cc73b","first_computed_at":"2026-07-04T16:36:46.619536Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:36:46.619536Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"kHS923mnmETadOIvYkhgcdyjpS/W8PGHziGuG9q9fho9PycAVxjYJF+pxSM1hSnrJU/uus99huIBjoEXbhpGCw==","signature_status":"signed_v1","signed_at":"2026-07-04T16:36:46.620012Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0304025","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bce535604d92f7c676776ea7f2df3c6cb7828a4ea57091289bbe9f0a99b24237","sha256:6a9faadd2ed2a1cbc716249ad311183bb22d7f88c812dcb49aa5ee83efd47f34"],"state_sha256":"ebd0a69f2319ae6792d81e110204f145d0531673b73d779a4af5ea7cebcd06a5"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GWsN5SmUiUz9g9VQODWKtUB7ewWK8nq93AbbRDwDyNsHQADPhFjMTNiplJbPV6VJjOxu4v8T6JBqk/0gD/qXDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T21:30:33.617288Z","bundle_sha256":"e3b8e8bb47680ae5a8469b78d4f077fdd760fc1e3aa75741b05b14d2d80fb835"}}