{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:GMUH4RLBPSXPHV6US3MYIVN2DE","short_pith_number":"pith:GMUH4RLB","canonical_record":{"source":{"id":"2607.17348","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-19T17:17:50Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"6a6ff13cd68917bd5b476b2323800983d4a3332a012e95fe3715ce8d88bee8ea","abstract_canon_sha256":"f8475fabdc59d2816a91727ead87da9c95c727bfd6e346787e40ad07a94cb415"},"schema_version":"1.0"},"canonical_sha256":"33287e45617caef3d7d496d98455ba19191dd96cc8be4753fa5acfe352fb2cab","source":{"kind":"arxiv","id":"2607.17348","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.17348","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.17348v1","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.17348","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_12","alias_value":"GMUH4RLBPSXP","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_16","alias_value":"GMUH4RLBPSXPHV6U","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_8","alias_value":"GMUH4RLB","created_at":"2026-07-21T01:21:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:GMUH4RLBPSXPHV6US3MYIVN2DE","target":"record","payload":{"canonical_record":{"source":{"id":"2607.17348","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-19T17:17:50Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"6a6ff13cd68917bd5b476b2323800983d4a3332a012e95fe3715ce8d88bee8ea","abstract_canon_sha256":"f8475fabdc59d2816a91727ead87da9c95c727bfd6e346787e40ad07a94cb415"},"schema_version":"1.0"},"canonical_sha256":"33287e45617caef3d7d496d98455ba19191dd96cc8be4753fa5acfe352fb2cab","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-21T01:21:29.014960Z","signature_b64":"V2y3CJ9bZm0fXv60kjFQlwHR/sowhBLj4onva0TjRH+Bz2jrJos+Vn6HGjxh+fOZ9Jc8zlnBlZ3diuqAedutAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"33287e45617caef3d7d496d98455ba19191dd96cc8be4753fa5acfe352fb2cab","last_reissued_at":"2026-07-21T01:21:29.014130Z","signature_status":"signed_v1","first_computed_at":"2026-07-21T01:21:29.014130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2607.17348","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":"2026-07-21T01:21:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"89N9Sl5s9/bkY9FPiD/s4G9qJVQ2XK0Onlukei/1S/3PUWUN3SAUBgevJzw7RRkDep3gjlVNyVgYm0beDTL9BQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T08:18:31.327947Z"},"content_sha256":"d4f637ef8c5cc0eec35e155c84b257822b395297ca79c6eef33891d9bb40a729","schema_version":"1.0","event_id":"sha256:d4f637ef8c5cc0eec35e155c84b257822b395297ca79c6eef33891d9bb40a729"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:GMUH4RLBPSXPHV6US3MYIVN2DE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SpecFANN: Spectral Fitting via Artificial Neural Networks I. A deep learning based fastwind emulator and fitting suite","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.SR","authors_text":"A. de Vicente, A. Escorza, A. J. Kalita, B. Ludwig, C. Hawcroft, D. M. Bowman, G. Holgado, H. Sana, J. Bodensteiner, J. I. Villase\\~nor, J. M\\\"uller-Horn, J. Puls, J. Vrancken, K. Deshmukh, M. Abdul-Masih, S. Simon-Diaz, T. Lechien","submitted_at":"2026-07-19T17:17:50Z","abstract_excerpt":"The importance of massive stars cannot be overstated: they are powerful probes of the early universe, play a vital role in the chemical and mechanical evolution of their host environments and their end products allow us to study the most extreme physics in the universe. Obtaining accurate stellar and surface parameters for large samples of massive stars is vital to our understanding of how they evolve, and how their births, lives and deaths affect their surroundings. With the large volume of data expected from upcoming spectroscopic surveys, computational limitations will likely be the most im"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.17348","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/2607.17348/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":"2026-07-21T01:21:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7W47e4Im4WlP5XyP22bVOCyiKVVf0kjTjVL8AmvmvV4paqOmTdde01QkAdznl2B1uVLs6DYW8pPp05jgIuDhAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T08:18:31.328454Z"},"content_sha256":"7c4404d67a952982718f48b4ef6c4e9c6d500276c9d34627a86848f842a944e3","schema_version":"1.0","event_id":"sha256:7c4404d67a952982718f48b4ef6c4e9c6d500276c9d34627a86848f842a944e3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/bundle.json","state_url":"https://pith.science/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/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":"2026-08-05T08:18:31Z","links":{"resolver":"https://pith.science/pith/GMUH4RLBPSXPHV6US3MYIVN2DE","bundle":"https://pith.science/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/bundle.json","state":"https://pith.science/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GMUH4RLBPSXPHV6US3MYIVN2DE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:GMUH4RLBPSXPHV6US3MYIVN2DE","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":"f8475fabdc59d2816a91727ead87da9c95c727bfd6e346787e40ad07a94cb415","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-19T17:17:50Z","title_canon_sha256":"6a6ff13cd68917bd5b476b2323800983d4a3332a012e95fe3715ce8d88bee8ea"},"schema_version":"1.0","source":{"id":"2607.17348","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2607.17348","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"arxiv_version","alias_value":"2607.17348v1","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2607.17348","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_12","alias_value":"GMUH4RLBPSXP","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_16","alias_value":"GMUH4RLBPSXPHV6U","created_at":"2026-07-21T01:21:29Z"},{"alias_kind":"pith_short_8","alias_value":"GMUH4RLB","created_at":"2026-07-21T01:21:29Z"}],"graph_snapshots":[{"event_id":"sha256:7c4404d67a952982718f48b4ef6c4e9c6d500276c9d34627a86848f842a944e3","target":"graph","created_at":"2026-07-21T01:21:29Z","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/2607.17348/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The importance of massive stars cannot be overstated: they are powerful probes of the early universe, play a vital role in the chemical and mechanical evolution of their host environments and their end products allow us to study the most extreme physics in the universe. Obtaining accurate stellar and surface parameters for large samples of massive stars is vital to our understanding of how they evolve, and how their births, lives and deaths affect their surroundings. With the large volume of data expected from upcoming spectroscopic surveys, computational limitations will likely be the most im","authors_text":"A. de Vicente, A. Escorza, A. J. Kalita, B. Ludwig, C. Hawcroft, D. M. Bowman, G. Holgado, H. Sana, J. Bodensteiner, J. I. Villase\\~nor, J. M\\\"uller-Horn, J. Puls, J. Vrancken, K. Deshmukh, M. Abdul-Masih, S. Simon-Diaz, T. Lechien","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-19T17:17:50Z","title":"SpecFANN: Spectral Fitting via Artificial Neural Networks I. A deep learning based fastwind emulator and fitting suite"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2607.17348","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:d4f637ef8c5cc0eec35e155c84b257822b395297ca79c6eef33891d9bb40a729","target":"record","created_at":"2026-07-21T01:21:29Z","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":"f8475fabdc59d2816a91727ead87da9c95c727bfd6e346787e40ad07a94cb415","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2026-07-19T17:17:50Z","title_canon_sha256":"6a6ff13cd68917bd5b476b2323800983d4a3332a012e95fe3715ce8d88bee8ea"},"schema_version":"1.0","source":{"id":"2607.17348","kind":"arxiv","version":1}},"canonical_sha256":"33287e45617caef3d7d496d98455ba19191dd96cc8be4753fa5acfe352fb2cab","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"33287e45617caef3d7d496d98455ba19191dd96cc8be4753fa5acfe352fb2cab","first_computed_at":"2026-07-21T01:21:29.014130Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-21T01:21:29.014130Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"V2y3CJ9bZm0fXv60kjFQlwHR/sowhBLj4onva0TjRH+Bz2jrJos+Vn6HGjxh+fOZ9Jc8zlnBlZ3diuqAedutAg==","signature_status":"signed_v1","signed_at":"2026-07-21T01:21:29.014960Z","signed_message":"canonical_sha256_bytes"},"source_id":"2607.17348","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d4f637ef8c5cc0eec35e155c84b257822b395297ca79c6eef33891d9bb40a729","sha256:7c4404d67a952982718f48b4ef6c4e9c6d500276c9d34627a86848f842a944e3"],"state_sha256":"3a7d98737c91152c7e040bf527841cc9057d08f0d98d0926b008cda098d93288"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EFV40dDWc/gaP6KbCcHA/bIa7r97Ve4do3LywrdJ4aSUlZliGckLJFbiVltm+o3gYPbhZzbVNxs8f8aL3bGTBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T08:18:31.332161Z","bundle_sha256":"559d30024252f557f3f47bcd7987f6e35355ba808bf332a92a811c480dccad7e"}}