{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:3ACXUG77M7P7ZPDGU6G63GYVHP","short_pith_number":"pith:3ACXUG77","canonical_record":{"source":{"id":"1901.02789","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2019-01-09T15:55:24Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"f7375cfc40699dab8d25574cdb36d56142a2e355445570959bcf29a9a5877410","abstract_canon_sha256":"7ce4efb23f52144c71921c70b9ef6573147376fb9edb4a1a068f34256e58209a"},"schema_version":"1.0"},"canonical_sha256":"d8057a1bff67dffcbc66a78ded9b153bedc807597c468521ccf242414a85de92","source":{"kind":"arxiv","id":"1901.02789","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02789","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02789v1","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02789","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"3ACXUG77M7P7","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"3ACXUG77M7P7ZPDG","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"3ACXUG77","created_at":"2026-05-18T12:33:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:3ACXUG77M7P7ZPDGU6G63GYVHP","target":"record","payload":{"canonical_record":{"source":{"id":"1901.02789","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2019-01-09T15:55:24Z","cross_cats_sorted":["cs.DL"],"title_canon_sha256":"f7375cfc40699dab8d25574cdb36d56142a2e355445570959bcf29a9a5877410","abstract_canon_sha256":"7ce4efb23f52144c71921c70b9ef6573147376fb9edb4a1a068f34256e58209a"},"schema_version":"1.0"},"canonical_sha256":"d8057a1bff67dffcbc66a78ded9b153bedc807597c468521ccf242414a85de92","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:56:39.443572Z","signature_b64":"VIyubFiHmu/p+TYwUvrTamtBqOTQu0TNq02PFh6I94wnL/cKW0GWFeeJvDcf7Ud8WAgbcpOTM0+Sp0k342LNCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d8057a1bff67dffcbc66a78ded9b153bedc807597c468521ccf242414a85de92","last_reissued_at":"2026-05-17T23:56:39.443016Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:56:39.443016Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1901.02789","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":"2026-05-17T23:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nT5U0lQLy0xHJS8JE2zkFHOdhyqumAZ8v0YdeQgMYiIDcw3iQ1OknDqDygG25cOEGreAyOR4PgOZvBEhWo/GAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T12:37:49.642261Z"},"content_sha256":"aa6750503339e8d8e16d4f98b8ec437d5e161faf59946eda3e7404d7a97428e1","schema_version":"1.0","event_id":"sha256:aa6750503339e8d8e16d4f98b8ec437d5e161faf59946eda3e7404d7a97428e1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:3ACXUG77M7P7ZPDGU6G63GYVHP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Taking census of physics","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.DL"],"primary_cat":"physics.soc-ph","authors_text":"Albert-Laszlo Barabasi, Dashun Wang, Federico Battiston, Federico Musciotto, Michael Szell, Roberta Sinatra","submitted_at":"2019-01-09T15:55:24Z","abstract_excerpt":"Over the past decades, the diversity of areas explored by physicists has exploded, encompassing new topics from biophysics and chemical physics to network science. However, it is unclear how these new subfields emerged from the traditional subject areas and how physicists explore them. To map out the evolution of physics subfields, here, we take an intellectual census of physics by studying physicists' careers. We use a large-scale publication data set, identify the subfields of 135,877 physicists and quantify their heterogeneous birth, growth and migration patterns among research areas. We fi"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02789","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":"2026-05-17T23:56:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1I0qY8udM7kkuJQzoK2c0JKPhO+8Ae5HLOJfCbfoGGvcss9LkNrV41XVB0CugZgstw8yo1pHNkAxMdta7JyODA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-19T12:37:49.642631Z"},"content_sha256":"a96f4f729686d191c6dbdbc5d07344fabe79b51646130639b75c61869342e888","schema_version":"1.0","event_id":"sha256:a96f4f729686d191c6dbdbc5d07344fabe79b51646130639b75c61869342e888"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/bundle.json","state_url":"https://pith.science/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/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":"2026-05-19T12:37:49Z","links":{"resolver":"https://pith.science/pith/3ACXUG77M7P7ZPDGU6G63GYVHP","bundle":"https://pith.science/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/bundle.json","state":"https://pith.science/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3ACXUG77M7P7ZPDGU6G63GYVHP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:3ACXUG77M7P7ZPDGU6G63GYVHP","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":"7ce4efb23f52144c71921c70b9ef6573147376fb9edb4a1a068f34256e58209a","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2019-01-09T15:55:24Z","title_canon_sha256":"f7375cfc40699dab8d25574cdb36d56142a2e355445570959bcf29a9a5877410"},"schema_version":"1.0","source":{"id":"1901.02789","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1901.02789","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"arxiv_version","alias_value":"1901.02789v1","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1901.02789","created_at":"2026-05-17T23:56:39Z"},{"alias_kind":"pith_short_12","alias_value":"3ACXUG77M7P7","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_16","alias_value":"3ACXUG77M7P7ZPDG","created_at":"2026-05-18T12:33:07Z"},{"alias_kind":"pith_short_8","alias_value":"3ACXUG77","created_at":"2026-05-18T12:33:07Z"}],"graph_snapshots":[{"event_id":"sha256:a96f4f729686d191c6dbdbc5d07344fabe79b51646130639b75c61869342e888","target":"graph","created_at":"2026-05-17T23:56:39Z","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":"Over the past decades, the diversity of areas explored by physicists has exploded, encompassing new topics from biophysics and chemical physics to network science. However, it is unclear how these new subfields emerged from the traditional subject areas and how physicists explore them. To map out the evolution of physics subfields, here, we take an intellectual census of physics by studying physicists' careers. We use a large-scale publication data set, identify the subfields of 135,877 physicists and quantify their heterogeneous birth, growth and migration patterns among research areas. We fi","authors_text":"Albert-Laszlo Barabasi, Dashun Wang, Federico Battiston, Federico Musciotto, Michael Szell, Roberta Sinatra","cross_cats":["cs.DL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2019-01-09T15:55:24Z","title":"Taking census of physics"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02789","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:aa6750503339e8d8e16d4f98b8ec437d5e161faf59946eda3e7404d7a97428e1","target":"record","created_at":"2026-05-17T23:56:39Z","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":"7ce4efb23f52144c71921c70b9ef6573147376fb9edb4a1a068f34256e58209a","cross_cats_sorted":["cs.DL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2019-01-09T15:55:24Z","title_canon_sha256":"f7375cfc40699dab8d25574cdb36d56142a2e355445570959bcf29a9a5877410"},"schema_version":"1.0","source":{"id":"1901.02789","kind":"arxiv","version":1}},"canonical_sha256":"d8057a1bff67dffcbc66a78ded9b153bedc807597c468521ccf242414a85de92","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d8057a1bff67dffcbc66a78ded9b153bedc807597c468521ccf242414a85de92","first_computed_at":"2026-05-17T23:56:39.443016Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:56:39.443016Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VIyubFiHmu/p+TYwUvrTamtBqOTQu0TNq02PFh6I94wnL/cKW0GWFeeJvDcf7Ud8WAgbcpOTM0+Sp0k342LNCw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:56:39.443572Z","signed_message":"canonical_sha256_bytes"},"source_id":"1901.02789","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:aa6750503339e8d8e16d4f98b8ec437d5e161faf59946eda3e7404d7a97428e1","sha256:a96f4f729686d191c6dbdbc5d07344fabe79b51646130639b75c61869342e888"],"state_sha256":"6c4f7735a2f22e2dfd06a88174ef5b9a59ca45fb47e81f39a9267b362fec7c37"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WNPVy+QnyDc9fpUIiK2tsnC1F+NB6oz8bl7Yj1NgmyJl7t/odO6Z4TfHhOQc5buvLoJFdmE2NDAlWdjfLm1KBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-19T12:37:49.644204Z","bundle_sha256":"16888f71c947cde90d0cf94d9fa68a25538f1b43baa6bf420af301c8a8d96e4a"}}