{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2002:E7KX73EVQKEOUFXIHVPTFZ2FG2","short_pith_number":"pith:E7KX73EV","canonical_record":{"source":{"id":"astro-ph/0202159","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-02-07T18:02:25Z","cross_cats_sorted":[],"title_canon_sha256":"a612de56e5adde3b4a4596a8a0c0c135ec75be7d6a7c7d9a45a857d54258fda3","abstract_canon_sha256":"51184ecb96849a3f86d3d4aa860b26b2cede061e7fe68aa31839ced10c4a1e5f"},"schema_version":"1.0"},"canonical_sha256":"27d57fec958288ea16e83d5f32e74536a20187e8b2ee558956f1d64a6172192a","source":{"kind":"arxiv","id":"astro-ph/0202159","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0202159","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0202159v1","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0202159","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"pith_short_12","alias_value":"E7KX73EVQKEO","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"E7KX73EVQKEOUFXI","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"E7KX73EV","created_at":"2026-05-18T12:25:50Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2002:E7KX73EVQKEOUFXIHVPTFZ2FG2","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0202159","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2002-02-07T18:02:25Z","cross_cats_sorted":[],"title_canon_sha256":"a612de56e5adde3b4a4596a8a0c0c135ec75be7d6a7c7d9a45a857d54258fda3","abstract_canon_sha256":"51184ecb96849a3f86d3d4aa860b26b2cede061e7fe68aa31839ced10c4a1e5f"},"schema_version":"1.0"},"canonical_sha256":"27d57fec958288ea16e83d5f32e74536a20187e8b2ee558956f1d64a6172192a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:22:20.051643Z","signature_b64":"O1Hqj5B8uBYIoXVVoCmuzAUnCZoqFuNQ955pItQKnwMPxYwAoZ1pH3RyQ04WhELIfQenR8HVp5J/hO4L57G0Bg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"27d57fec958288ea16e83d5f32e74536a20187e8b2ee558956f1d64a6172192a","last_reissued_at":"2026-05-18T04:22:20.050867Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:22:20.050867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0202159","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":"2026-05-18T04:22:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1e0sykC8k/pduS4MmjN1p1GbW8PPW+inNTjilWvGrO7j/e0knqKfBjtpmfd9koRKR10/LKpIomatVd0yiyJlDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:47:53.037436Z"},"content_sha256":"a5e97fcd87102160c598d7890a1fd927a0b573eed5648ec4fd55754ff9f6bdfd","schema_version":"1.0","event_id":"sha256:a5e97fcd87102160c598d7890a1fd927a0b573eed5648ec4fd55754ff9f6bdfd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2002:E7KX73EVQKEOUFXIHVPTFZ2FG2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Composition of Cosmic Rays at the Knee","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. Moiseev, A. Sill, C.L. Pryke, D.B. Kieda, D. Muller, G. Spiczak, J. Cronin, J. Hinton, J. Horandel, J. Kettler, J. Knapp, J. Matthews, J.W. Fowler, K.- H. Kampert, L.F. Fortson, M. L. Cherry, M. Roth, R. Engel, S. A. Minnick, S. Coutu, S.P. Swordy, S.P. Wakely, T. Shibata, Z. Cao","submitted_at":"2002-02-07T18:02:25Z","abstract_excerpt":"The observation of a small change in spectral slope, or 'knee' in the fluxes of cosmic rays near energies 10^15 eV has caused much speculation since its discovery over 40 years ago. The origin of this feature remains unknown. A small workshop to review some modern experimental measurements of this region was held at the Adler Planetarium in Chicago, USA in June 2000. This paper summarizes the results presented at this workshop and the discussion of their interpretation in the context of hadronic models of atmospheric airshowers."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0202159","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":"2026-05-18T04:22:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kzjj+N1G4ZYrWRgAwy1Met+d7diZMZmKswT9Owr/5MCb6AWxUwVrzCFlfmDuujK0mwLeBy4eC0kjPKBZYRLzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T09:47:53.037828Z"},"content_sha256":"b49ce8b586bb641c641802b0fbd8cbf2106deff43ffa69272f3a52420f969b6a","schema_version":"1.0","event_id":"sha256:b49ce8b586bb641c641802b0fbd8cbf2106deff43ffa69272f3a52420f969b6a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/bundle.json","state_url":"https://pith.science/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/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":"2026-05-30T09:47:53Z","links":{"resolver":"https://pith.science/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2","bundle":"https://pith.science/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/bundle.json","state":"https://pith.science/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/E7KX73EVQKEOUFXIHVPTFZ2FG2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2002:E7KX73EVQKEOUFXIHVPTFZ2FG2","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":"51184ecb96849a3f86d3d4aa860b26b2cede061e7fe68aa31839ced10c4a1e5f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-02-07T18:02:25Z","title_canon_sha256":"a612de56e5adde3b4a4596a8a0c0c135ec75be7d6a7c7d9a45a857d54258fda3"},"schema_version":"1.0","source":{"id":"astro-ph/0202159","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0202159","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0202159v1","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0202159","created_at":"2026-05-18T04:22:20Z"},{"alias_kind":"pith_short_12","alias_value":"E7KX73EVQKEO","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_16","alias_value":"E7KX73EVQKEOUFXI","created_at":"2026-05-18T12:25:50Z"},{"alias_kind":"pith_short_8","alias_value":"E7KX73EV","created_at":"2026-05-18T12:25:50Z"}],"graph_snapshots":[{"event_id":"sha256:b49ce8b586bb641c641802b0fbd8cbf2106deff43ffa69272f3a52420f969b6a","target":"graph","created_at":"2026-05-18T04:22:20Z","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":"The observation of a small change in spectral slope, or 'knee' in the fluxes of cosmic rays near energies 10^15 eV has caused much speculation since its discovery over 40 years ago. The origin of this feature remains unknown. A small workshop to review some modern experimental measurements of this region was held at the Adler Planetarium in Chicago, USA in June 2000. This paper summarizes the results presented at this workshop and the discussion of their interpretation in the context of hadronic models of atmospheric airshowers.","authors_text":"A. Moiseev, A. Sill, C.L. Pryke, D.B. Kieda, D. Muller, G. Spiczak, J. Cronin, J. Hinton, J. Horandel, J. Kettler, J. Knapp, J. Matthews, J.W. Fowler, K.- H. Kampert, L.F. Fortson, M. L. Cherry, M. Roth, R. Engel, S. A. Minnick, S. Coutu, S.P. Swordy, S.P. Wakely, T. Shibata, Z. Cao","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2002-02-07T18:02:25Z","title":"The Composition of Cosmic Rays at the Knee"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0202159","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:a5e97fcd87102160c598d7890a1fd927a0b573eed5648ec4fd55754ff9f6bdfd","target":"record","created_at":"2026-05-18T04:22:20Z","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":"51184ecb96849a3f86d3d4aa860b26b2cede061e7fe68aa31839ced10c4a1e5f","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2002-02-07T18:02:25Z","title_canon_sha256":"a612de56e5adde3b4a4596a8a0c0c135ec75be7d6a7c7d9a45a857d54258fda3"},"schema_version":"1.0","source":{"id":"astro-ph/0202159","kind":"arxiv","version":1}},"canonical_sha256":"27d57fec958288ea16e83d5f32e74536a20187e8b2ee558956f1d64a6172192a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"27d57fec958288ea16e83d5f32e74536a20187e8b2ee558956f1d64a6172192a","first_computed_at":"2026-05-18T04:22:20.050867Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T04:22:20.050867Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"O1Hqj5B8uBYIoXVVoCmuzAUnCZoqFuNQ955pItQKnwMPxYwAoZ1pH3RyQ04WhELIfQenR8HVp5J/hO4L57G0Bg==","signature_status":"signed_v1","signed_at":"2026-05-18T04:22:20.051643Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0202159","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a5e97fcd87102160c598d7890a1fd927a0b573eed5648ec4fd55754ff9f6bdfd","sha256:b49ce8b586bb641c641802b0fbd8cbf2106deff43ffa69272f3a52420f969b6a"],"state_sha256":"8c885ccc5d00f97ff3cf054e0760bc70c3013885386e1b6cbbb8f89a522a779c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yk9LN+0/uunJclgPV87Y/Z1iqfxjKNHknRXKMSuenYMgYeQN+GnmL458yVLzr9kniwObYor9GRebm2lZfvf7Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T09:47:53.040023Z","bundle_sha256":"0c16bc370771026428bd836a3caff4dd8ecabc3b7ed49f59e3a165bdfa1603fd"}}