{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:CB2ABALXOQEZMYJ6PCOUM2QLU6","short_pith_number":"pith:CB2ABALX","canonical_record":{"source":{"id":"1210.1319","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-10-04T07:27:50Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"fa0aa8ace1ceb1b79ad3b55ea9ab17cb1ab3063defa462f8c645df83fb799276","abstract_canon_sha256":"45922331d2e69a11cc6ca095bc9b802d277e57d360474e0f63d6dfed29deba47"},"schema_version":"1.0"},"canonical_sha256":"1074008177740996613e789d466a0ba7ab6a71b3daf9d17a7f3e350bc9c20b22","source":{"kind":"arxiv","id":"1210.1319","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.1319","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"arxiv_version","alias_value":"1210.1319v2","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.1319","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"pith_short_12","alias_value":"CB2ABALXOQEZ","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"CB2ABALXOQEZMYJ6","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"CB2ABALX","created_at":"2026-05-18T12:27:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:CB2ABALXOQEZMYJ6PCOUM2QLU6","target":"record","payload":{"canonical_record":{"source":{"id":"1210.1319","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-10-04T07:27:50Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"fa0aa8ace1ceb1b79ad3b55ea9ab17cb1ab3063defa462f8c645df83fb799276","abstract_canon_sha256":"45922331d2e69a11cc6ca095bc9b802d277e57d360474e0f63d6dfed29deba47"},"schema_version":"1.0"},"canonical_sha256":"1074008177740996613e789d466a0ba7ab6a71b3daf9d17a7f3e350bc9c20b22","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:54:05.968785Z","signature_b64":"zQCYB9Yc9dAf0Ro93p7FAYmmZbX9s+opLW41VXBce4oIY2E0QG8fRHw0IOWdgTKBtgM0nzumK49LdYoiz3IOAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1074008177740996613e789d466a0ba7ab6a71b3daf9d17a7f3e350bc9c20b22","last_reissued_at":"2026-05-18T01:54:05.968214Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:54:05.968214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1210.1319","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:54:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LJaLIlYKLZuZO26YaHN2VCA2MYNdlC/Ggb3UHUeO+oSYNAnkvfG9A60HkiFD39bWaH90v47KhVcNez4zMVRgBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:36:21.053007Z"},"content_sha256":"84abde2d4ebc1049aa6a63bf9ab87831fd6367a0cdd9ea3902b5618a64b5226d","schema_version":"1.0","event_id":"sha256:84abde2d4ebc1049aa6a63bf9ab87831fd6367a0cdd9ea3902b5618a64b5226d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:CB2ABALXOQEZMYJ6PCOUM2QLU6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nitrogen fluorescence in air for observing extensive air showers","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.HE","authors_text":"A. Ulrich, B. Keilhauer, J. Matthews, M. Bohacova, M. Fraga, N. Sakaki, Y. Tameda, Y. Tsunesada","submitted_at":"2012-10-04T07:27:50Z","abstract_excerpt":"Extensive air showers initiate the fluorescence emissions from nitrogen molecules in air. The UV-light is emitted isotropically and can be used for observing the longitudinal development of extensive air showers in the atmosphere over tenth of kilometers. This measurement technique is well-established since it is exploited for many decades by several cosmic ray experiments. However, a fundamental aspect of the air shower analyses is the description of the fluorescence emission in dependence on varying atmospheric conditions. Different fluorescence yields affect directly the energy scaling of a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.1319","kind":"arxiv","version":2},"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":"2026-05-18T01:54:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yFNoi8dUfkzpIfF/bBwtb/MROc4Xul5BplsU1IKtm7QwsdwwP2teg7C/2h4VPMIS1E1U/B74U1vtJ48I7TB7Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:36:21.053691Z"},"content_sha256":"ba9d1f406c7743b09c024c4515ba40c907c19cb4d7c549ba378a55512ad2d094","schema_version":"1.0","event_id":"sha256:ba9d1f406c7743b09c024c4515ba40c907c19cb4d7c549ba378a55512ad2d094"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/bundle.json","state_url":"https://pith.science/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/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":"2026-05-25T18:36:21Z","links":{"resolver":"https://pith.science/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6","bundle":"https://pith.science/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/bundle.json","state":"https://pith.science/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CB2ABALXOQEZMYJ6PCOUM2QLU6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:CB2ABALXOQEZMYJ6PCOUM2QLU6","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":"45922331d2e69a11cc6ca095bc9b802d277e57d360474e0f63d6dfed29deba47","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-10-04T07:27:50Z","title_canon_sha256":"fa0aa8ace1ceb1b79ad3b55ea9ab17cb1ab3063defa462f8c645df83fb799276"},"schema_version":"1.0","source":{"id":"1210.1319","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1210.1319","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"arxiv_version","alias_value":"1210.1319v2","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1210.1319","created_at":"2026-05-18T01:54:05Z"},{"alias_kind":"pith_short_12","alias_value":"CB2ABALXOQEZ","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_16","alias_value":"CB2ABALXOQEZMYJ6","created_at":"2026-05-18T12:27:01Z"},{"alias_kind":"pith_short_8","alias_value":"CB2ABALX","created_at":"2026-05-18T12:27:01Z"}],"graph_snapshots":[{"event_id":"sha256:ba9d1f406c7743b09c024c4515ba40c907c19cb4d7c549ba378a55512ad2d094","target":"graph","created_at":"2026-05-18T01:54:05Z","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":"Extensive air showers initiate the fluorescence emissions from nitrogen molecules in air. The UV-light is emitted isotropically and can be used for observing the longitudinal development of extensive air showers in the atmosphere over tenth of kilometers. This measurement technique is well-established since it is exploited for many decades by several cosmic ray experiments. However, a fundamental aspect of the air shower analyses is the description of the fluorescence emission in dependence on varying atmospheric conditions. Different fluorescence yields affect directly the energy scaling of a","authors_text":"A. Ulrich, B. Keilhauer, J. Matthews, M. Bohacova, M. Fraga, N. Sakaki, Y. Tameda, Y. Tsunesada","cross_cats":["astro-ph.IM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-10-04T07:27:50Z","title":"Nitrogen fluorescence in air for observing extensive air showers"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1210.1319","kind":"arxiv","version":2},"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":"sha256:84abde2d4ebc1049aa6a63bf9ab87831fd6367a0cdd9ea3902b5618a64b5226d","target":"record","created_at":"2026-05-18T01:54:05Z","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":"45922331d2e69a11cc6ca095bc9b802d277e57d360474e0f63d6dfed29deba47","cross_cats_sorted":["astro-ph.IM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2012-10-04T07:27:50Z","title_canon_sha256":"fa0aa8ace1ceb1b79ad3b55ea9ab17cb1ab3063defa462f8c645df83fb799276"},"schema_version":"1.0","source":{"id":"1210.1319","kind":"arxiv","version":2}},"canonical_sha256":"1074008177740996613e789d466a0ba7ab6a71b3daf9d17a7f3e350bc9c20b22","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1074008177740996613e789d466a0ba7ab6a71b3daf9d17a7f3e350bc9c20b22","first_computed_at":"2026-05-18T01:54:05.968214Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:54:05.968214Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zQCYB9Yc9dAf0Ro93p7FAYmmZbX9s+opLW41VXBce4oIY2E0QG8fRHw0IOWdgTKBtgM0nzumK49LdYoiz3IOAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:54:05.968785Z","signed_message":"canonical_sha256_bytes"},"source_id":"1210.1319","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:84abde2d4ebc1049aa6a63bf9ab87831fd6367a0cdd9ea3902b5618a64b5226d","sha256:ba9d1f406c7743b09c024c4515ba40c907c19cb4d7c549ba378a55512ad2d094"],"state_sha256":"ace2ac16859e4bd9584279dc3c29efc23c81cb91a916d8be97c7a7545fa8fbef"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"iBa9Opz2bk6uR+IP6dlhEKRCRIbNZRWdayaWVbBuy0/i5r1rKcXMFaD1FzRXqVC4fdDuUdc9Ay/zJLV4q5gDCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:36:21.057414Z","bundle_sha256":"3f0d3937af16760d18b8f52c8ba47f6b02a350138bddd3e4507937f31113a645"}}