{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:7OBZEKQKZ5Y3LKEVUKW2XU4J7O","short_pith_number":"pith:7OBZEKQK","canonical_record":{"source":{"id":"2103.16623","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-03-30T19:00:18Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"a6f47a8e21e50e190b3f164023fcde8f945d2f4f41090ac4730a860e3280771f","abstract_canon_sha256":"3f522bea291581227692a40b6046e8e1a6b86e1e026e30b91152cbfbd4b1fb7b"},"schema_version":"1.0"},"canonical_sha256":"fb83922a0acf71b5a895a2adabd389fb9186dab4f7cd870b449d863d8779108b","source":{"kind":"arxiv","id":"2103.16623","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.16623","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"arxiv_version","alias_value":"2103.16623v4","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.16623","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_12","alias_value":"7OBZEKQKZ5Y3","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"7OBZEKQKZ5Y3LKEV","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"7OBZEKQK","created_at":"2026-07-05T03:31:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:7OBZEKQKZ5Y3LKEVUKW2XU4J7O","target":"record","payload":{"canonical_record":{"source":{"id":"2103.16623","kind":"arxiv","version":4},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-03-30T19:00:18Z","cross_cats_sorted":["nucl-ex"],"title_canon_sha256":"a6f47a8e21e50e190b3f164023fcde8f945d2f4f41090ac4730a860e3280771f","abstract_canon_sha256":"3f522bea291581227692a40b6046e8e1a6b86e1e026e30b91152cbfbd4b1fb7b"},"schema_version":"1.0"},"canonical_sha256":"fb83922a0acf71b5a895a2adabd389fb9186dab4f7cd870b449d863d8779108b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:31:59.527501Z","signature_b64":"w1vuXtqv0hRyneMa6Ec0HXEQyENiM5a+UIZRGz9PBekIpiF1LYS8iL4kcxnqFYbeB6Utxw0Ktt3jfwLl/DEQAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"fb83922a0acf71b5a895a2adabd389fb9186dab4f7cd870b449d863d8779108b","last_reissued_at":"2026-07-05T03:31:59.526932Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:31:59.526932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2103.16623","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T03:31:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k58MhzAis9IT0tKMxIu4zWuD/Y1/cYrkGqAitWf1jPMLAz6c/ShN7BCU12AqxAuWVdxFvPMFFg3N3n/QiQ8/Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T03:11:33.859093Z"},"content_sha256":"c07a30861244afe9f4d9ceab55571471caeb93c9f094cfcf5ca08842d7e475e1","schema_version":"1.0","event_id":"sha256:c07a30861244afe9f4d9ceab55571471caeb93c9f094cfcf5ca08842d7e475e1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:7OBZEKQKZ5Y3LKEVUKW2XU4J7O","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Mapping the Electromagnetic Fields of Heavy-Ion Collisions with the Breit-Wheeler Process","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["nucl-ex"],"primary_cat":"hep-ph","authors_text":"James Daniel Brandenburg, Wangmei Zha, Zhangbu Xu","submitted_at":"2021-03-30T19:00:18Z","abstract_excerpt":"Ultra-relativistic heavy-ion collisions are expected to produce the strongest electromagnetic fields in the known Universe. These highly-Lorentz contracted fields can manifest themselves as linearly polarized quasi-real photons that can interact via the Breit-Wheeler process to produce lepton anti-lepton pairs. The energy and momentum distribution of the produced dileptons carry information about the strength and spatial distribution of the colliding fields. Recently it has been demonstrated that photons from these fields can interact even in heavy-ion collisions with hadronic overlap, providi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.16623","kind":"arxiv","version":4},"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/2103.16623/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":"2026-07-05T03:31:59Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"LiG9l+fIGHMo6KVdbb8Efu7v1mRbjWYm28aiBqy+qpR4WDfwZ3H+/vi8zRcrXGpFL6qUAaOKwQVjfeL//dj0DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T03:11:33.859652Z"},"content_sha256":"c1eb4cfe2a6846225fe2d12906cc3a9f2997fbeb3ae9ee1f7d450aa738b4a4f9","schema_version":"1.0","event_id":"sha256:c1eb4cfe2a6846225fe2d12906cc3a9f2997fbeb3ae9ee1f7d450aa738b4a4f9"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/bundle.json","state_url":"https://pith.science/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/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":"2026-08-22T03:11:33Z","links":{"resolver":"https://pith.science/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O","bundle":"https://pith.science/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/bundle.json","state":"https://pith.science/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/state.json","well_known_bundle":"https://pith.science/.well-known/pith/7OBZEKQKZ5Y3LKEVUKW2XU4J7O/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:7OBZEKQKZ5Y3LKEVUKW2XU4J7O","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":"3f522bea291581227692a40b6046e8e1a6b86e1e026e30b91152cbfbd4b1fb7b","cross_cats_sorted":["nucl-ex"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-03-30T19:00:18Z","title_canon_sha256":"a6f47a8e21e50e190b3f164023fcde8f945d2f4f41090ac4730a860e3280771f"},"schema_version":"1.0","source":{"id":"2103.16623","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2103.16623","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"arxiv_version","alias_value":"2103.16623v4","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2103.16623","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_12","alias_value":"7OBZEKQKZ5Y3","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"7OBZEKQKZ5Y3LKEV","created_at":"2026-07-05T03:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"7OBZEKQK","created_at":"2026-07-05T03:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:c1eb4cfe2a6846225fe2d12906cc3a9f2997fbeb3ae9ee1f7d450aa738b4a4f9","target":"graph","created_at":"2026-07-05T03:31:59Z","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/2103.16623/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Ultra-relativistic heavy-ion collisions are expected to produce the strongest electromagnetic fields in the known Universe. These highly-Lorentz contracted fields can manifest themselves as linearly polarized quasi-real photons that can interact via the Breit-Wheeler process to produce lepton anti-lepton pairs. The energy and momentum distribution of the produced dileptons carry information about the strength and spatial distribution of the colliding fields. Recently it has been demonstrated that photons from these fields can interact even in heavy-ion collisions with hadronic overlap, providi","authors_text":"James Daniel Brandenburg, Wangmei Zha, Zhangbu Xu","cross_cats":["nucl-ex"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-03-30T19:00:18Z","title":"Mapping the Electromagnetic Fields of Heavy-Ion Collisions with the Breit-Wheeler Process"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2103.16623","kind":"arxiv","version":4},"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:c07a30861244afe9f4d9ceab55571471caeb93c9f094cfcf5ca08842d7e475e1","target":"record","created_at":"2026-07-05T03:31:59Z","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":"3f522bea291581227692a40b6046e8e1a6b86e1e026e30b91152cbfbd4b1fb7b","cross_cats_sorted":["nucl-ex"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"hep-ph","submitted_at":"2021-03-30T19:00:18Z","title_canon_sha256":"a6f47a8e21e50e190b3f164023fcde8f945d2f4f41090ac4730a860e3280771f"},"schema_version":"1.0","source":{"id":"2103.16623","kind":"arxiv","version":4}},"canonical_sha256":"fb83922a0acf71b5a895a2adabd389fb9186dab4f7cd870b449d863d8779108b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"fb83922a0acf71b5a895a2adabd389fb9186dab4f7cd870b449d863d8779108b","first_computed_at":"2026-07-05T03:31:59.526932Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:31:59.526932Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"w1vuXtqv0hRyneMa6Ec0HXEQyENiM5a+UIZRGz9PBekIpiF1LYS8iL4kcxnqFYbeB6Utxw0Ktt3jfwLl/DEQAQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:31:59.527501Z","signed_message":"canonical_sha256_bytes"},"source_id":"2103.16623","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c07a30861244afe9f4d9ceab55571471caeb93c9f094cfcf5ca08842d7e475e1","sha256:c1eb4cfe2a6846225fe2d12906cc3a9f2997fbeb3ae9ee1f7d450aa738b4a4f9"],"state_sha256":"2ed05b239996c88e7cb4f21c981f4f206858dba5d64e884208b5f6480a6a865d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"R0I8atXl8tJJ3XqHPDUBXfo8GtglZX8jmZtG6FWp1M9rjjeqeeLJAH2T7UBZy8bFLGzj01+rN5uZ237JBR8ODw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T03:11:33.866114Z","bundle_sha256":"3f2318d2d3fe45302e042e22f6b7d2a1b446706555847a2decf5fc1335b57258"}}