{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:MKGOS5KZNMXS3YDZMFWSBYLYBM","short_pith_number":"pith:MKGOS5KZ","canonical_record":{"source":{"id":"1507.04018","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-07-14T20:31:22Z","cross_cats_sorted":[],"title_canon_sha256":"2a62bfbe50cec570526df915e940aa091596a28897777203ae2a5cdd264ef39e","abstract_canon_sha256":"f2af8bfea8f807f15fe3f3bf16cf0902db5eb59e42bf26f1e8b057277044f369"},"schema_version":"1.0"},"canonical_sha256":"628ce975596b2f2de079616d20e1780b109ea95152e690adc9203055416770f7","source":{"kind":"arxiv","id":"1507.04018","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.04018","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"arxiv_version","alias_value":"1507.04018v2","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.04018","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"pith_short_12","alias_value":"MKGOS5KZNMXS","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"MKGOS5KZNMXS3YDZ","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"MKGOS5KZ","created_at":"2026-05-18T12:29:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:MKGOS5KZNMXS3YDZMFWSBYLYBM","target":"record","payload":{"canonical_record":{"source":{"id":"1507.04018","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-07-14T20:31:22Z","cross_cats_sorted":[],"title_canon_sha256":"2a62bfbe50cec570526df915e940aa091596a28897777203ae2a5cdd264ef39e","abstract_canon_sha256":"f2af8bfea8f807f15fe3f3bf16cf0902db5eb59e42bf26f1e8b057277044f369"},"schema_version":"1.0"},"canonical_sha256":"628ce975596b2f2de079616d20e1780b109ea95152e690adc9203055416770f7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:33:15.438441Z","signature_b64":"rYEX16WGedtjAVKYweprtiiENhGcq3Snp3o7v/RXLQU8dD8i3a2FnS7p6gfj2eFaGT+FF2YhJnf1uHd8FAoGAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"628ce975596b2f2de079616d20e1780b109ea95152e690adc9203055416770f7","last_reissued_at":"2026-05-18T01:33:15.437760Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:33:15.437760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1507.04018","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":"2026-05-18T01:33:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ib1RWk6Plx6ifO9C2La2Xm/tXSdyCIvEpnblGdgC6lFGH3hvG7v+99eFm7EBr0fqGW44a9qYg7GvdPdsR8hmBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T14:26:32.932765Z"},"content_sha256":"5b717fab2bfc20e0d6cbb2f84c6631fc36fa3ee5772f69f9ca4e551e9b25be36","schema_version":"1.0","event_id":"sha256:5b717fab2bfc20e0d6cbb2f84c6631fc36fa3ee5772f69f9ca4e551e9b25be36"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:MKGOS5KZNMXS3YDZMFWSBYLYBM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Ultrahard spectra of PeV neutrinos from supernovae in compact star clusters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A.M. Bykov, D.C. Ellison, P.E. Gladilin, S.M. Osipov","submitted_at":"2015-07-14T20:31:22Z","abstract_excerpt":"Starburst regions with multiple powerful winds of young massive stars and supernova remnants are favorable sites for high-energy cosmic ray acceleration. A supernova shock colliding with a fast wind from a compact cluster of young stars allows the acceleration of protons to energies well above the standard limits of diffusive shock acceleration in an isolated SN. The proton spectrum in such a wind-supernova PeV accelerator is hard with a large flux in the high-energy-end of the spectrum producing copious gamma-rays and neutrinos in inelastic nuclear collisions. We argue that SN shocks in the W"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.04018","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":"2026-05-18T01:33:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4SOaEOEOvNjj5dNk8nOju8CToo8qKZ50QX8E9+vsuejbiGO17vjTRnOhuqwOfst/q8vv/0nolVxqe0B1JzvuDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-10T14:26:32.933111Z"},"content_sha256":"af7b4bcf08aa91d66cf34388b617ff40a77831c591763407c5d97ce96c80ecb5","schema_version":"1.0","event_id":"sha256:af7b4bcf08aa91d66cf34388b617ff40a77831c591763407c5d97ce96c80ecb5"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/bundle.json","state_url":"https://pith.science/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/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":"2026-06-10T14:26:32Z","links":{"resolver":"https://pith.science/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM","bundle":"https://pith.science/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/bundle.json","state":"https://pith.science/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/MKGOS5KZNMXS3YDZMFWSBYLYBM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:MKGOS5KZNMXS3YDZMFWSBYLYBM","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":"f2af8bfea8f807f15fe3f3bf16cf0902db5eb59e42bf26f1e8b057277044f369","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-07-14T20:31:22Z","title_canon_sha256":"2a62bfbe50cec570526df915e940aa091596a28897777203ae2a5cdd264ef39e"},"schema_version":"1.0","source":{"id":"1507.04018","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1507.04018","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"arxiv_version","alias_value":"1507.04018v2","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1507.04018","created_at":"2026-05-18T01:33:15Z"},{"alias_kind":"pith_short_12","alias_value":"MKGOS5KZNMXS","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_16","alias_value":"MKGOS5KZNMXS3YDZ","created_at":"2026-05-18T12:29:32Z"},{"alias_kind":"pith_short_8","alias_value":"MKGOS5KZ","created_at":"2026-05-18T12:29:32Z"}],"graph_snapshots":[{"event_id":"sha256:af7b4bcf08aa91d66cf34388b617ff40a77831c591763407c5d97ce96c80ecb5","target":"graph","created_at":"2026-05-18T01:33:15Z","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":"Starburst regions with multiple powerful winds of young massive stars and supernova remnants are favorable sites for high-energy cosmic ray acceleration. A supernova shock colliding with a fast wind from a compact cluster of young stars allows the acceleration of protons to energies well above the standard limits of diffusive shock acceleration in an isolated SN. The proton spectrum in such a wind-supernova PeV accelerator is hard with a large flux in the high-energy-end of the spectrum producing copious gamma-rays and neutrinos in inelastic nuclear collisions. We argue that SN shocks in the W","authors_text":"A.M. Bykov, D.C. Ellison, P.E. Gladilin, S.M. Osipov","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-07-14T20:31:22Z","title":"Ultrahard spectra of PeV neutrinos from supernovae in compact star clusters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1507.04018","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":"sha256:5b717fab2bfc20e0d6cbb2f84c6631fc36fa3ee5772f69f9ca4e551e9b25be36","target":"record","created_at":"2026-05-18T01:33:15Z","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":"f2af8bfea8f807f15fe3f3bf16cf0902db5eb59e42bf26f1e8b057277044f369","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2015-07-14T20:31:22Z","title_canon_sha256":"2a62bfbe50cec570526df915e940aa091596a28897777203ae2a5cdd264ef39e"},"schema_version":"1.0","source":{"id":"1507.04018","kind":"arxiv","version":2}},"canonical_sha256":"628ce975596b2f2de079616d20e1780b109ea95152e690adc9203055416770f7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"628ce975596b2f2de079616d20e1780b109ea95152e690adc9203055416770f7","first_computed_at":"2026-05-18T01:33:15.437760Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:15.437760Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"rYEX16WGedtjAVKYweprtiiENhGcq3Snp3o7v/RXLQU8dD8i3a2FnS7p6gfj2eFaGT+FF2YhJnf1uHd8FAoGAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:15.438441Z","signed_message":"canonical_sha256_bytes"},"source_id":"1507.04018","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b717fab2bfc20e0d6cbb2f84c6631fc36fa3ee5772f69f9ca4e551e9b25be36","sha256:af7b4bcf08aa91d66cf34388b617ff40a77831c591763407c5d97ce96c80ecb5"],"state_sha256":"a7a7b284ccd1759c95401dd033f92ea98485b5622cd2b92e3f576a66e191673a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vlD5S8bJwtNEvpHDLq1EcJ+AtzhQzzM6v43xUi44o4jkVCAN/BRuF+F4B4vv1ERNmiYG7+IT45YRs8G9E6DZCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-10T14:26:32.935359Z","bundle_sha256":"e910077eaf6576c830a67ee16606df06e7658b305b909140992503c7a824ff2b"}}