{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:KVBQQUSA4EJT3V4ITHQM4AXPJB","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":"82b825096f7a7124d9cea04b03fb06ed4a2fc34a2828c4f12dce2daecfc09a5f","cross_cats_sorted":["cs.DL","cs.SI","physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-02-13T14:47:05Z","title_canon_sha256":"9c3ec4905c7648f0f791d0e1ea5e1e34f5e163e74c3958dc5f636ac170886679"},"schema_version":"1.0","source":{"id":"1302.3126","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1302.3126","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"arxiv_version","alias_value":"1302.3126v1","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1302.3126","created_at":"2026-05-18T03:33:48Z"},{"alias_kind":"pith_short_12","alias_value":"KVBQQUSA4EJT","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_16","alias_value":"KVBQQUSA4EJT3V4I","created_at":"2026-05-18T12:27:51Z"},{"alias_kind":"pith_short_8","alias_value":"KVBQQUSA","created_at":"2026-05-18T12:27:51Z"}],"graph_snapshots":[{"event_id":"sha256:27a1bc6ff2c4b57f4494c0dabd732e3d9026b47de8b580940a10dc72229ce572","target":"graph","created_at":"2026-05-18T03:33:48Z","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":"An integrated European Research Area (ERA) is a critical component for a more competitive and open European R&D system. However, the impact of EU-specific integration policies aimed at overcoming innovation barriers associated with national borders is not well understood. Here we analyze 2.4 x 10^6 patent applications filed with the European Patent Office (EPO) over the 25-year period 1986-2010 along with a sample of 2.6 x 10^5 records from the ISI Web of Science to quantitatively measure the role of borders in international R&D collaboration and mobility. From these data we construct five dif","authors_text":"Alessandro Chessa, Alexander M. Petersen, Andrea Morescalchi, Fabio Pammolli, Massimo Riccaboni, Orion Penner","cross_cats":["cs.DL","cs.SI","physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-02-13T14:47:05Z","title":"Is Europe Evolving Toward an Integrated Research Area?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1302.3126","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":"sha256:881458272e6fcbed34f824b2211bd10fbee3ff45dca2b3d77633fccb68d2170f","target":"record","created_at":"2026-05-18T03:33:48Z","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":"82b825096f7a7124d9cea04b03fb06ed4a2fc34a2828c4f12dce2daecfc09a5f","cross_cats_sorted":["cs.DL","cs.SI","physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.soc-ph","submitted_at":"2013-02-13T14:47:05Z","title_canon_sha256":"9c3ec4905c7648f0f791d0e1ea5e1e34f5e163e74c3958dc5f636ac170886679"},"schema_version":"1.0","source":{"id":"1302.3126","kind":"arxiv","version":1}},"canonical_sha256":"5543085240e1133dd78899e0ce02ef486ad22cb5075050c755b73600875084f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"5543085240e1133dd78899e0ce02ef486ad22cb5075050c755b73600875084f3","first_computed_at":"2026-05-18T03:33:48.655890Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:33:48.655890Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ze33iL+naq8CjAH8xxoTK6CNnG/31EXLCEkDlu/B44gXaGXxQpYmEZiNG8T7Ja8euSZn/zZxl6gGvcG2DQh+BQ==","signature_status":"signed_v1","signed_at":"2026-05-18T03:33:48.656646Z","signed_message":"canonical_sha256_bytes"},"source_id":"1302.3126","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:881458272e6fcbed34f824b2211bd10fbee3ff45dca2b3d77633fccb68d2170f","sha256:27a1bc6ff2c4b57f4494c0dabd732e3d9026b47de8b580940a10dc72229ce572"],"state_sha256":"86740c92fa84c7ffb0c35b12a44c306bd9885a95b3759d54335c1008357953cf"}