{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:SVBPZJMI5457JVXVFQE6P2HKOT","short_pith_number":"pith:SVBPZJMI","canonical_record":{"source":{"id":"1605.03966","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-12T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"31d3f962c01217d32e265c6abbb7edc867af48fb3fba9318c31cc260f03cd5e5","abstract_canon_sha256":"0a7ecb05148c37e76fb4355a4cd2ca377e529662410d91c93e68ed4abe3be103"},"schema_version":"1.0"},"canonical_sha256":"9542fca588ef3bf4d6f52c09e7e8ea74fc12204403a75fc1fcd251c1623b795f","source":{"kind":"arxiv","id":"1605.03966","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.03966","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"arxiv_version","alias_value":"1605.03966v1","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.03966","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"pith_short_12","alias_value":"SVBPZJMI5457","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SVBPZJMI5457JVXV","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SVBPZJMI","created_at":"2026-05-18T12:30:44Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:SVBPZJMI5457JVXVFQE6P2HKOT","target":"record","payload":{"canonical_record":{"source":{"id":"1605.03966","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-12T20:00:02Z","cross_cats_sorted":[],"title_canon_sha256":"31d3f962c01217d32e265c6abbb7edc867af48fb3fba9318c31cc260f03cd5e5","abstract_canon_sha256":"0a7ecb05148c37e76fb4355a4cd2ca377e529662410d91c93e68ed4abe3be103"},"schema_version":"1.0"},"canonical_sha256":"9542fca588ef3bf4d6f52c09e7e8ea74fc12204403a75fc1fcd251c1623b795f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:10:03.138561Z","signature_b64":"zyQQ5rMolHmhLzveKL4wUmANycchM7OcmT8PEYkSFDKPetiqyWqYQwpqPaRA7zdgVbWxav841xXbCIt1jCSZDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9542fca588ef3bf4d6f52c09e7e8ea74fc12204403a75fc1fcd251c1623b795f","last_reissued_at":"2026-05-18T01:10:03.137909Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:10:03.137909Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1605.03966","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":"2026-05-18T01:10:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j86mc4XEV5rBJZP+P/fxakEBGsKz+cRnFsnNM7kyz1S8SOyWjE0PGyNGFdQrwO2MmSg6OO3V7Re5wA2QGeMjAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T22:05:30.878361Z"},"content_sha256":"67aa3241ca7a861bba0200b5bb0064b3dc28becf9e4af69068392e5e78a776a0","schema_version":"1.0","event_id":"sha256:67aa3241ca7a861bba0200b5bb0064b3dc28becf9e4af69068392e5e78a776a0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:SVBPZJMI5457JVXVFQE6P2HKOT","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Soft State of Cygnus X-1 Observed with NuSTAR: A Variable Corona and a Stable Inner Disk","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. C. Fabian, C. J. Hailey, D. Barret, D. J. Walton, D. Stern, F. A. Harrison, F. E. Christensen, F. Fuerst, F. Rahoui, J. A. Tomsick, J. M. Miller, J. Wilms, K. K. Madsen, L. Tao, M. Clavel, M. L. Parker, S. E. Boggs, V. Grinberg, W. W. Craig, W. Zhang","submitted_at":"2016-05-12T20:00:02Z","abstract_excerpt":"We present a multi-epoch hard X-ray analysis of Cygnus X-1 in its soft state based on four observations with NuSTAR. Despite the basic similarity of the observed spectra, there is clear spectral variability between epochs. To investigate this variability, we construct a model incorporating both the standard disk-corona continuum and relativistic reflection from the accretion disk, based on prior NuSTAR work on Cygnus X-1, and apply this model to each epoch independently. We find excellent consistency for the black hole spin, and the iron abundance of the accretion disk, which are expected to r"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.03966","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":"2026-05-18T01:10:03Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vHSPDxoDXNtuU5GCxiTp3yxeRGLrt6H1rg7JCe57NvyoMeNYc0vWicgjxzCmY46dRH0ljo44u0WfRgptL/RUBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T22:05:30.878738Z"},"content_sha256":"e5fb1b513d10a8e50ed8cf89a236411c056fb7b5233d557e714548e9080eae9f","schema_version":"1.0","event_id":"sha256:e5fb1b513d10a8e50ed8cf89a236411c056fb7b5233d557e714548e9080eae9f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SVBPZJMI5457JVXVFQE6P2HKOT/bundle.json","state_url":"https://pith.science/pith/SVBPZJMI5457JVXVFQE6P2HKOT/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SVBPZJMI5457JVXVFQE6P2HKOT/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":"2026-06-06T22:05:30Z","links":{"resolver":"https://pith.science/pith/SVBPZJMI5457JVXVFQE6P2HKOT","bundle":"https://pith.science/pith/SVBPZJMI5457JVXVFQE6P2HKOT/bundle.json","state":"https://pith.science/pith/SVBPZJMI5457JVXVFQE6P2HKOT/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SVBPZJMI5457JVXVFQE6P2HKOT/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:SVBPZJMI5457JVXVFQE6P2HKOT","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":"0a7ecb05148c37e76fb4355a4cd2ca377e529662410d91c93e68ed4abe3be103","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-12T20:00:02Z","title_canon_sha256":"31d3f962c01217d32e265c6abbb7edc867af48fb3fba9318c31cc260f03cd5e5"},"schema_version":"1.0","source":{"id":"1605.03966","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1605.03966","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"arxiv_version","alias_value":"1605.03966v1","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1605.03966","created_at":"2026-05-18T01:10:03Z"},{"alias_kind":"pith_short_12","alias_value":"SVBPZJMI5457","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_16","alias_value":"SVBPZJMI5457JVXV","created_at":"2026-05-18T12:30:44Z"},{"alias_kind":"pith_short_8","alias_value":"SVBPZJMI","created_at":"2026-05-18T12:30:44Z"}],"graph_snapshots":[{"event_id":"sha256:e5fb1b513d10a8e50ed8cf89a236411c056fb7b5233d557e714548e9080eae9f","target":"graph","created_at":"2026-05-18T01:10:03Z","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":"We present a multi-epoch hard X-ray analysis of Cygnus X-1 in its soft state based on four observations with NuSTAR. Despite the basic similarity of the observed spectra, there is clear spectral variability between epochs. To investigate this variability, we construct a model incorporating both the standard disk-corona continuum and relativistic reflection from the accretion disk, based on prior NuSTAR work on Cygnus X-1, and apply this model to each epoch independently. We find excellent consistency for the black hole spin, and the iron abundance of the accretion disk, which are expected to r","authors_text":"A. C. Fabian, C. J. Hailey, D. Barret, D. J. Walton, D. Stern, F. A. Harrison, F. E. Christensen, F. Fuerst, F. Rahoui, J. A. Tomsick, J. M. Miller, J. Wilms, K. K. Madsen, L. Tao, M. Clavel, M. L. Parker, S. E. Boggs, V. Grinberg, W. W. Craig, W. Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-12T20:00:02Z","title":"The Soft State of Cygnus X-1 Observed with NuSTAR: A Variable Corona and a Stable Inner Disk"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1605.03966","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":"sha256:67aa3241ca7a861bba0200b5bb0064b3dc28becf9e4af69068392e5e78a776a0","target":"record","created_at":"2026-05-18T01:10:03Z","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":"0a7ecb05148c37e76fb4355a4cd2ca377e529662410d91c93e68ed4abe3be103","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-05-12T20:00:02Z","title_canon_sha256":"31d3f962c01217d32e265c6abbb7edc867af48fb3fba9318c31cc260f03cd5e5"},"schema_version":"1.0","source":{"id":"1605.03966","kind":"arxiv","version":1}},"canonical_sha256":"9542fca588ef3bf4d6f52c09e7e8ea74fc12204403a75fc1fcd251c1623b795f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9542fca588ef3bf4d6f52c09e7e8ea74fc12204403a75fc1fcd251c1623b795f","first_computed_at":"2026-05-18T01:10:03.137909Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:10:03.137909Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zyQQ5rMolHmhLzveKL4wUmANycchM7OcmT8PEYkSFDKPetiqyWqYQwpqPaRA7zdgVbWxav841xXbCIt1jCSZDw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:10:03.138561Z","signed_message":"canonical_sha256_bytes"},"source_id":"1605.03966","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:67aa3241ca7a861bba0200b5bb0064b3dc28becf9e4af69068392e5e78a776a0","sha256:e5fb1b513d10a8e50ed8cf89a236411c056fb7b5233d557e714548e9080eae9f"],"state_sha256":"ab89b0fed9d8ec6e5f397fca48bca85f286358ab7600b1cd037f70ece317120c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"M5gamCuwuWQ4MHwfKmv2viwtJ7sBWt9MM1UXAyd4eeKqPl3Qwxlh4qeXg3LfDZAOUbzvPYYPiLaM0IiQM7J1Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T22:05:30.881725Z","bundle_sha256":"ab0f605e6f087a01df7ad8cb9c0d197cd46ab9a9248d47ab7bb8b4220c0c9750"}}