{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:WPD6ZXAPEOIAGOVWUMRRRN3OY4","short_pith_number":"pith:WPD6ZXAP","canonical_record":{"source":{"id":"2407.18507","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-07-26T04:31:29Z","cross_cats_sorted":["astro-ph.EP","physics.ao-ph"],"title_canon_sha256":"2d625c5172fa3a3cedda033a3a15f25a5fd7f7046c0eb43663d353d110a20a2a","abstract_canon_sha256":"b339cddf48045c5509c0622b47c6471622eab63e7f5a163b9926a1e17b497853"},"schema_version":"1.0"},"canonical_sha256":"b3c7ecdc0f2390033ab6a32318b76ec71defa02d8a05ee656a28c267909abfec","source":{"kind":"arxiv","id":"2407.18507","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.18507","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"arxiv_version","alias_value":"2407.18507v1","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.18507","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_12","alias_value":"WPD6ZXAPEOIA","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_16","alias_value":"WPD6ZXAPEOIAGOVW","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_8","alias_value":"WPD6ZXAP","created_at":"2026-07-05T08:48:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:WPD6ZXAPEOIAGOVWUMRRRN3OY4","target":"record","payload":{"canonical_record":{"source":{"id":"2407.18507","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-07-26T04:31:29Z","cross_cats_sorted":["astro-ph.EP","physics.ao-ph"],"title_canon_sha256":"2d625c5172fa3a3cedda033a3a15f25a5fd7f7046c0eb43663d353d110a20a2a","abstract_canon_sha256":"b339cddf48045c5509c0622b47c6471622eab63e7f5a163b9926a1e17b497853"},"schema_version":"1.0"},"canonical_sha256":"b3c7ecdc0f2390033ab6a32318b76ec71defa02d8a05ee656a28c267909abfec","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:48:50.729715Z","signature_b64":"vVrlzIafhJzpl1qE1+Z6//9I8Jjff3J2cxZyc9MvFBC14KLb11Jv4HU5MvO2iqbxCypeURGs1y9rnXx+kVHBAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b3c7ecdc0f2390033ab6a32318b76ec71defa02d8a05ee656a28c267909abfec","last_reissued_at":"2026-07-05T08:48:50.729257Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:48:50.729257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2407.18507","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":"2026-07-05T08:48:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"h9TfK8l/s61FZYBIUFUDLwMSVU6S0RrMwfRhZMu+5YtoAZugaDhxhXH0/qMpJ/9VsIqBr0CwEWrbjFzvGYzaBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-11T06:01:02.641459Z"},"content_sha256":"33cc7e2a0096872169e19d5dbafdbe8c892d84966eb36d2bd2fe30dc694b8aa6","schema_version":"1.0","event_id":"sha256:33cc7e2a0096872169e19d5dbafdbe8c892d84966eb36d2bd2fe30dc694b8aa6"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:WPD6ZXAPEOIAGOVWUMRRRN3OY4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.EP","physics.ao-ph"],"primary_cat":"astro-ph.IM","authors_text":"Ayaki Takeda, Eisuke Kurogi, Hiroyuki Uchida, Koji Mori, Kumiko K. Nobukawa, Masayoshi Nobukawa, Nakazawa Kazuhiro, Satoru Katsuda, Satoru Kuwano, Takeshi G. Tsuru, Takumi Kishimoto, Yamato Ito, Yoshihisa Kawabe, Yuma Aoki","submitted_at":"2024-07-26T04:31:29Z","abstract_excerpt":"Measurements of the upper atmosphere at ~100 km are important to investigate climate change, space weather forecasting, and the interaction between the Sun and the Earth. Atmospheric occultations of cosmic X-ray sources are an effective technique to measure the neutral density in the upper atmosphere. We are developing the instrument SUIM dedicated to continuous observations of atmospheric occultations. SUIM will be mounted on a platform on the exterior of the International Space Station for six months and pointed at the Earth's rim to observe atmospheric absorption of the cosmic X-ray backgro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.18507","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/2407.18507/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":"2026-07-05T08:48:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AX3ED+guAA+hljscGzlvboqlAMyDsoNqbFb7QFA4Zznm9EDkEKuDoXYctVZOzy7FCjx5t4n+DHA2Y2K+YiiaAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-11T06:01:02.642122Z"},"content_sha256":"30bb8f7ff845515b625d0596e68379ad6cc8a57876b808c538447a7d7fd30b27","schema_version":"1.0","event_id":"sha256:30bb8f7ff845515b625d0596e68379ad6cc8a57876b808c538447a7d7fd30b27"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/bundle.json","state_url":"https://pith.science/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/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":"2026-07-11T06:01:02Z","links":{"resolver":"https://pith.science/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4","bundle":"https://pith.science/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/bundle.json","state":"https://pith.science/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/WPD6ZXAPEOIAGOVWUMRRRN3OY4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:WPD6ZXAPEOIAGOVWUMRRRN3OY4","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":"b339cddf48045c5509c0622b47c6471622eab63e7f5a163b9926a1e17b497853","cross_cats_sorted":["astro-ph.EP","physics.ao-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-07-26T04:31:29Z","title_canon_sha256":"2d625c5172fa3a3cedda033a3a15f25a5fd7f7046c0eb43663d353d110a20a2a"},"schema_version":"1.0","source":{"id":"2407.18507","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2407.18507","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"arxiv_version","alias_value":"2407.18507v1","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2407.18507","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_12","alias_value":"WPD6ZXAPEOIA","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_16","alias_value":"WPD6ZXAPEOIAGOVW","created_at":"2026-07-05T08:48:50Z"},{"alias_kind":"pith_short_8","alias_value":"WPD6ZXAP","created_at":"2026-07-05T08:48:50Z"}],"graph_snapshots":[{"event_id":"sha256:30bb8f7ff845515b625d0596e68379ad6cc8a57876b808c538447a7d7fd30b27","target":"graph","created_at":"2026-07-05T08:48:50Z","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/2407.18507/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Measurements of the upper atmosphere at ~100 km are important to investigate climate change, space weather forecasting, and the interaction between the Sun and the Earth. Atmospheric occultations of cosmic X-ray sources are an effective technique to measure the neutral density in the upper atmosphere. We are developing the instrument SUIM dedicated to continuous observations of atmospheric occultations. SUIM will be mounted on a platform on the exterior of the International Space Station for six months and pointed at the Earth's rim to observe atmospheric absorption of the cosmic X-ray backgro","authors_text":"Ayaki Takeda, Eisuke Kurogi, Hiroyuki Uchida, Koji Mori, Kumiko K. Nobukawa, Masayoshi Nobukawa, Nakazawa Kazuhiro, Satoru Katsuda, Satoru Kuwano, Takeshi G. Tsuru, Takumi Kishimoto, Yamato Ito, Yoshihisa Kawabe, Yuma Aoki","cross_cats":["astro-ph.EP","physics.ao-ph"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-07-26T04:31:29Z","title":"Feasibility study of upper atmosphere density measurement on the ISS by observations of the CXB transmitted through the Earth rim"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2407.18507","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":"sha256:33cc7e2a0096872169e19d5dbafdbe8c892d84966eb36d2bd2fe30dc694b8aa6","target":"record","created_at":"2026-07-05T08:48:50Z","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":"b339cddf48045c5509c0622b47c6471622eab63e7f5a163b9926a1e17b497853","cross_cats_sorted":["astro-ph.EP","physics.ao-ph"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-07-26T04:31:29Z","title_canon_sha256":"2d625c5172fa3a3cedda033a3a15f25a5fd7f7046c0eb43663d353d110a20a2a"},"schema_version":"1.0","source":{"id":"2407.18507","kind":"arxiv","version":1}},"canonical_sha256":"b3c7ecdc0f2390033ab6a32318b76ec71defa02d8a05ee656a28c267909abfec","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b3c7ecdc0f2390033ab6a32318b76ec71defa02d8a05ee656a28c267909abfec","first_computed_at":"2026-07-05T08:48:50.729257Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:48:50.729257Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vVrlzIafhJzpl1qE1+Z6//9I8Jjff3J2cxZyc9MvFBC14KLb11Jv4HU5MvO2iqbxCypeURGs1y9rnXx+kVHBAA==","signature_status":"signed_v1","signed_at":"2026-07-05T08:48:50.729715Z","signed_message":"canonical_sha256_bytes"},"source_id":"2407.18507","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:33cc7e2a0096872169e19d5dbafdbe8c892d84966eb36d2bd2fe30dc694b8aa6","sha256:30bb8f7ff845515b625d0596e68379ad6cc8a57876b808c538447a7d7fd30b27"],"state_sha256":"0b26d7a2a93c5305a144590c2948daf46ba998ba22b140414c1ef960a3b621b9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DPyGOi2H+RSbwyn0VtiVrxpguYsmbTEQgKDLK0KB7gfJusP6DnKG9Zy0dWjb42dQZLorWc71nrlX0Bw68DFtAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-11T06:01:02.650287Z","bundle_sha256":"3cd5ab11addfce05435a69f4a0c2d3b4e5e7bfbd3a9e3c9c642ba2043bbaa297"}}