{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:WZS5ICHT36A2R3RMKBNAQMI4XO","short_pith_number":"pith:WZS5ICHT","canonical_record":{"source":{"id":"2008.03849","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-10T01:03:08Z","cross_cats_sorted":[],"title_canon_sha256":"844ba4ef20620328fd7a9610e758e09ed27c9a1ed96ee8be22a820a69cfb8c29","abstract_canon_sha256":"c5acc245a80c1f6716e19341c26af257a8f1b291026c2b5014f0ebb5b8cc6731"},"schema_version":"1.0"},"canonical_sha256":"b665d408f3df81a8ee2c505a08311cbba1f4d8020929e676b44ab3d9ebdee1aa","source":{"kind":"arxiv","id":"2008.03849","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.03849","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"arxiv_version","alias_value":"2008.03849v1","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.03849","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_12","alias_value":"WZS5ICHT36A2","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_16","alias_value":"WZS5ICHT36A2R3RM","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_8","alias_value":"WZS5ICHT","created_at":"2026-07-05T01:25:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:WZS5ICHT36A2R3RMKBNAQMI4XO","target":"record","payload":{"canonical_record":{"source":{"id":"2008.03849","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-10T01:03:08Z","cross_cats_sorted":[],"title_canon_sha256":"844ba4ef20620328fd7a9610e758e09ed27c9a1ed96ee8be22a820a69cfb8c29","abstract_canon_sha256":"c5acc245a80c1f6716e19341c26af257a8f1b291026c2b5014f0ebb5b8cc6731"},"schema_version":"1.0"},"canonical_sha256":"b665d408f3df81a8ee2c505a08311cbba1f4d8020929e676b44ab3d9ebdee1aa","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:25:46.076605Z","signature_b64":"SDBzoouGVQhenGzBOkp0Ua6O6LzAHIkbtSFsx+23t5xI/W1mUV0mEtpPz2rMGKa4kre5ezuw7ZOinYzjD6PdAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b665d408f3df81a8ee2c505a08311cbba1f4d8020929e676b44ab3d9ebdee1aa","last_reissued_at":"2026-07-05T01:25:46.076042Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:25:46.076042Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2008.03849","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":"2026-07-05T01:25:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0+yHWb7Ie2oeoJWdzd0y3fZbljzFMAbYRypGb6iA5+QTr/6SKcv3216+NW6TcAnBIOw9oPvIAZxonkqOL9XlDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:03:21.117922Z"},"content_sha256":"26ecae19c7b50dc9d9625e1cada03ea7453ba310254ff42392e4b49e6b11a6b3","schema_version":"1.0","event_id":"sha256:26ecae19c7b50dc9d9625e1cada03ea7453ba310254ff42392e4b49e6b11a6b3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:WZS5ICHT36A2R3RMKBNAQMI4XO","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Testing Comptonization as the origin of the continuum in nonmagnetic Cataclysmic Variables. The photon index of X-ray emission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"F. D'Amico, Filippo Frontera, L. Titarchuk, M. Orlandini, T. Maiolino, W. Wang, Z. Q. Cheng","submitted_at":"2020-08-10T01:03:08Z","abstract_excerpt":"X-ray spectra of nonmagnetic cataclysmic variables (nmCVs) in the ~ 0.3$-$15 keV energy band have been described either by one or several optically thin thermal plasma components, or by cooling flow models. We tested if the spectral continuum in nmCVs could be successfully described by Comptonization of soft photons off hot electrons presented in a cloud surrounding the source [the transition layer, (TL)]. We used publicly XMM-Newton Epic-pn, Chandra HETG/ACIS and LETG/HRC, and RXTE PCA and HEXTE observations of four Dwarf Novae (U~Gem, SS~Cyg, VW~Hyi and SS~Aur) observed in the quiescence and"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.03849","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/2008.03849/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":"2026-07-05T01:25:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j7kJhIEDZ58UN2G/8cbm9xkXYCHGc7vlILrHUCK31f3VZN4UKKP3hau09pXpwGVpbF02fdoY5XueMvjLSyNJBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-05T15:03:21.118294Z"},"content_sha256":"e0fa9c0220ee28fe6e4b7283035dcc9f50f93d2788d34dd19165497e0eabb781","schema_version":"1.0","event_id":"sha256:e0fa9c0220ee28fe6e4b7283035dcc9f50f93d2788d34dd19165497e0eabb781"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/bundle.json","state_url":"https://pith.science/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/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":"2026-07-05T15:03:21Z","links":{"resolver":"https://pith.science/pith/WZS5ICHT36A2R3RMKBNAQMI4XO","bundle":"https://pith.science/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/bundle.json","state":"https://pith.science/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WZS5ICHT36A2R3RMKBNAQMI4XO/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:WZS5ICHT36A2R3RMKBNAQMI4XO","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":"c5acc245a80c1f6716e19341c26af257a8f1b291026c2b5014f0ebb5b8cc6731","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-10T01:03:08Z","title_canon_sha256":"844ba4ef20620328fd7a9610e758e09ed27c9a1ed96ee8be22a820a69cfb8c29"},"schema_version":"1.0","source":{"id":"2008.03849","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.03849","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"arxiv_version","alias_value":"2008.03849v1","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.03849","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_12","alias_value":"WZS5ICHT36A2","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_16","alias_value":"WZS5ICHT36A2R3RM","created_at":"2026-07-05T01:25:46Z"},{"alias_kind":"pith_short_8","alias_value":"WZS5ICHT","created_at":"2026-07-05T01:25:46Z"}],"graph_snapshots":[{"event_id":"sha256:e0fa9c0220ee28fe6e4b7283035dcc9f50f93d2788d34dd19165497e0eabb781","target":"graph","created_at":"2026-07-05T01:25:46Z","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/2008.03849/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"X-ray spectra of nonmagnetic cataclysmic variables (nmCVs) in the ~ 0.3$-$15 keV energy band have been described either by one or several optically thin thermal plasma components, or by cooling flow models. We tested if the spectral continuum in nmCVs could be successfully described by Comptonization of soft photons off hot electrons presented in a cloud surrounding the source [the transition layer, (TL)]. We used publicly XMM-Newton Epic-pn, Chandra HETG/ACIS and LETG/HRC, and RXTE PCA and HEXTE observations of four Dwarf Novae (U~Gem, SS~Cyg, VW~Hyi and SS~Aur) observed in the quiescence and","authors_text":"F. D'Amico, Filippo Frontera, L. Titarchuk, M. Orlandini, T. Maiolino, W. Wang, Z. Q. Cheng","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-10T01:03:08Z","title":"Testing Comptonization as the origin of the continuum in nonmagnetic Cataclysmic Variables. The photon index of X-ray emission"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.03849","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":"sha256:26ecae19c7b50dc9d9625e1cada03ea7453ba310254ff42392e4b49e6b11a6b3","target":"record","created_at":"2026-07-05T01:25:46Z","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":"c5acc245a80c1f6716e19341c26af257a8f1b291026c2b5014f0ebb5b8cc6731","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-10T01:03:08Z","title_canon_sha256":"844ba4ef20620328fd7a9610e758e09ed27c9a1ed96ee8be22a820a69cfb8c29"},"schema_version":"1.0","source":{"id":"2008.03849","kind":"arxiv","version":1}},"canonical_sha256":"b665d408f3df81a8ee2c505a08311cbba1f4d8020929e676b44ab3d9ebdee1aa","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b665d408f3df81a8ee2c505a08311cbba1f4d8020929e676b44ab3d9ebdee1aa","first_computed_at":"2026-07-05T01:25:46.076042Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:25:46.076042Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SDBzoouGVQhenGzBOkp0Ua6O6LzAHIkbtSFsx+23t5xI/W1mUV0mEtpPz2rMGKa4kre5ezuw7ZOinYzjD6PdAg==","signature_status":"signed_v1","signed_at":"2026-07-05T01:25:46.076605Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.03849","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:26ecae19c7b50dc9d9625e1cada03ea7453ba310254ff42392e4b49e6b11a6b3","sha256:e0fa9c0220ee28fe6e4b7283035dcc9f50f93d2788d34dd19165497e0eabb781"],"state_sha256":"79b21459ed870ffab9bea9eb06f64aaa40314216deb3884b5e989cffdd88eb20"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RD1D5UOaDafXe6dIl9upjDgRLBupPh28yryHxybN4SabaWZ6wu9tNehunnnYNgkkvpro7eiELhZbd0VLYQHWCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-05T15:03:21.120291Z","bundle_sha256":"3cd052aabbb32d388c2b8313d5a679d66423202f0c60f25ff694db9da66dd486"}}