{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:PXFHRY6FRNWTVQX7JUFKYB255Y","short_pith_number":"pith:PXFHRY6F","canonical_record":{"source":{"id":"1807.07714","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-20T06:56:20Z","cross_cats_sorted":[],"title_canon_sha256":"d31e18507334a9b0a8fbfffb1d4af41e72ae24ba696888ba2e46a43c02603bd9","abstract_canon_sha256":"6d52c364915c388c25e9053b6c7b6bea18a1de4aec50024d618deb969f69cc2d"},"schema_version":"1.0"},"canonical_sha256":"7dca78e3c58b6d3ac2ff4d0aac075dee1de64739332dfcb49a31bac828e02968","source":{"kind":"arxiv","id":"1807.07714","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.07714","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"arxiv_version","alias_value":"1807.07714v1","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.07714","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"pith_short_12","alias_value":"PXFHRY6FRNWT","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PXFHRY6FRNWTVQX7","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PXFHRY6F","created_at":"2026-05-18T12:32:46Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:PXFHRY6FRNWTVQX7JUFKYB255Y","target":"record","payload":{"canonical_record":{"source":{"id":"1807.07714","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-20T06:56:20Z","cross_cats_sorted":[],"title_canon_sha256":"d31e18507334a9b0a8fbfffb1d4af41e72ae24ba696888ba2e46a43c02603bd9","abstract_canon_sha256":"6d52c364915c388c25e9053b6c7b6bea18a1de4aec50024d618deb969f69cc2d"},"schema_version":"1.0"},"canonical_sha256":"7dca78e3c58b6d3ac2ff4d0aac075dee1de64739332dfcb49a31bac828e02968","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:02:17.683106Z","signature_b64":"aaS9bl/7hFTg2lKZcTjuL2C4F7luXvLDBB/09yUM3DsT2UGOjjP6vykKPGI2ARQw1gBQl+shOZY76vd5XQ2FBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7dca78e3c58b6d3ac2ff4d0aac075dee1de64739332dfcb49a31bac828e02968","last_reissued_at":"2026-05-18T00:02:17.682602Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:02:17.682602Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.07714","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":"2026-05-18T00:02:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v7+po4O6ve4F40bX0zpEKkWJ14XO0O9QdmixHQhW/oVge6kKdR/FkiaFPAEtGXUdN37d8hJaa4eptsf1HT+wAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:03:39.837226Z"},"content_sha256":"7fa78f537630d1a9c10ff5f0d7fd67b45462aaa5afe1283e5af673f0adb8adbc","schema_version":"1.0","event_id":"sha256:7fa78f537630d1a9c10ff5f0d7fd67b45462aaa5afe1283e5af673f0adb8adbc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:PXFHRY6FRNWTVQX7JUFKYB255Y","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Photospheric Shear Flows in Solar Active Regions and Their Relation to Flare Occurrence","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"D. Shaun Bloomfield, Jordan A. Guerra, Manolis K. Georgoulis, Peter T. Gallagher, Sung-Hong Park","submitted_at":"2018-07-20T06:56:20Z","abstract_excerpt":"Solar active regions (ARs) that produce major flares typically exhibit strong plasma shear flows around photospheric magnetic polarity inversion lines (MPILs). It is therefore important to quantitatively measure such photospheric shear flows in ARs for a better understanding of their relation to flare occurrence. Photospheric flow fields were determined by applying the Differential Affine Velocity Estimator for Vector Magnetograms (DAVE4VM) method to a large data set of 2,548 co-aligned pairs of AR vector magnetograms with 12-min separation over the period 2012-2016. From each AR flow-field ma"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.07714","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":"2026-05-18T00:02:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pWlgi258Y7oxKdVpLaDpbsSsjRxj1dY9YYvmWbkBcK79beq02ggwAaO5ENTXeASz5c7Ke6+QGTeHDtLRU6x2Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-03T08:03:39.837594Z"},"content_sha256":"657c5eaeb8799ecf7563499dbe18b19a11f54c193db19a8e216ac9d6c56dcd34","schema_version":"1.0","event_id":"sha256:657c5eaeb8799ecf7563499dbe18b19a11f54c193db19a8e216ac9d6c56dcd34"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/bundle.json","state_url":"https://pith.science/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/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":"2026-06-03T08:03:39Z","links":{"resolver":"https://pith.science/pith/PXFHRY6FRNWTVQX7JUFKYB255Y","bundle":"https://pith.science/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/bundle.json","state":"https://pith.science/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/state.json","well_known_bundle":"https://pith.science/.well-known/pith/PXFHRY6FRNWTVQX7JUFKYB255Y/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:PXFHRY6FRNWTVQX7JUFKYB255Y","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":"6d52c364915c388c25e9053b6c7b6bea18a1de4aec50024d618deb969f69cc2d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-20T06:56:20Z","title_canon_sha256":"d31e18507334a9b0a8fbfffb1d4af41e72ae24ba696888ba2e46a43c02603bd9"},"schema_version":"1.0","source":{"id":"1807.07714","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.07714","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"arxiv_version","alias_value":"1807.07714v1","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.07714","created_at":"2026-05-18T00:02:17Z"},{"alias_kind":"pith_short_12","alias_value":"PXFHRY6FRNWT","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_16","alias_value":"PXFHRY6FRNWTVQX7","created_at":"2026-05-18T12:32:46Z"},{"alias_kind":"pith_short_8","alias_value":"PXFHRY6F","created_at":"2026-05-18T12:32:46Z"}],"graph_snapshots":[{"event_id":"sha256:657c5eaeb8799ecf7563499dbe18b19a11f54c193db19a8e216ac9d6c56dcd34","target":"graph","created_at":"2026-05-18T00:02:17Z","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":"Solar active regions (ARs) that produce major flares typically exhibit strong plasma shear flows around photospheric magnetic polarity inversion lines (MPILs). It is therefore important to quantitatively measure such photospheric shear flows in ARs for a better understanding of their relation to flare occurrence. Photospheric flow fields were determined by applying the Differential Affine Velocity Estimator for Vector Magnetograms (DAVE4VM) method to a large data set of 2,548 co-aligned pairs of AR vector magnetograms with 12-min separation over the period 2012-2016. From each AR flow-field ma","authors_text":"D. Shaun Bloomfield, Jordan A. Guerra, Manolis K. Georgoulis, Peter T. Gallagher, Sung-Hong Park","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-20T06:56:20Z","title":"Photospheric Shear Flows in Solar Active Regions and Their Relation to Flare Occurrence"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.07714","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":"sha256:7fa78f537630d1a9c10ff5f0d7fd67b45462aaa5afe1283e5af673f0adb8adbc","target":"record","created_at":"2026-05-18T00:02:17Z","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":"6d52c364915c388c25e9053b6c7b6bea18a1de4aec50024d618deb969f69cc2d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-20T06:56:20Z","title_canon_sha256":"d31e18507334a9b0a8fbfffb1d4af41e72ae24ba696888ba2e46a43c02603bd9"},"schema_version":"1.0","source":{"id":"1807.07714","kind":"arxiv","version":1}},"canonical_sha256":"7dca78e3c58b6d3ac2ff4d0aac075dee1de64739332dfcb49a31bac828e02968","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7dca78e3c58b6d3ac2ff4d0aac075dee1de64739332dfcb49a31bac828e02968","first_computed_at":"2026-05-18T00:02:17.682602Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:02:17.682602Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"aaS9bl/7hFTg2lKZcTjuL2C4F7luXvLDBB/09yUM3DsT2UGOjjP6vykKPGI2ARQw1gBQl+shOZY76vd5XQ2FBw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:02:17.683106Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.07714","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7fa78f537630d1a9c10ff5f0d7fd67b45462aaa5afe1283e5af673f0adb8adbc","sha256:657c5eaeb8799ecf7563499dbe18b19a11f54c193db19a8e216ac9d6c56dcd34"],"state_sha256":"ff356d5b4cb744d7d1b67237608ec890b4448f7d20942b1608ac1cf9976b0ec2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bVWYVraRhdPFcw1NRGvFfE9Gw9HDPxrC7AkTyUO7Py1b9VVkAy2QDfnLP70uzPDnWv4UQnaKTYaPCWlTyhzgAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-03T08:03:39.839634Z","bundle_sha256":"3a37ff26c290fadad75e1137dd9411a65ddae6f2b3289d981888068a2ab0cc1c"}}