{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:GUVFCALJSRA67P6IRWO2EEIJWJ","short_pith_number":"pith:GUVFCALJ","canonical_record":{"source":{"id":"1311.6574","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2013-11-26T07:45:49Z","cross_cats_sorted":[],"title_canon_sha256":"0b43dce9c4a93acca8ff9138a173f2619c60c69985c971c83fe0e522f2657741","abstract_canon_sha256":"2fffccfa7f3d93f3edd64e0f9540d0bd94897149f255c07b8472f7e892eda150"},"schema_version":"1.0"},"canonical_sha256":"352a5101699441efbfc88d9da21109b25966957fc7545312c42a0596a080ab69","source":{"kind":"arxiv","id":"1311.6574","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.6574","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1311.6574v2","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.6574","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"GUVFCALJSRA6","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GUVFCALJSRA67P6I","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GUVFCALJ","created_at":"2026-05-18T12:27:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:GUVFCALJSRA67P6IRWO2EEIJWJ","target":"record","payload":{"canonical_record":{"source":{"id":"1311.6574","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2013-11-26T07:45:49Z","cross_cats_sorted":[],"title_canon_sha256":"0b43dce9c4a93acca8ff9138a173f2619c60c69985c971c83fe0e522f2657741","abstract_canon_sha256":"2fffccfa7f3d93f3edd64e0f9540d0bd94897149f255c07b8472f7e892eda150"},"schema_version":"1.0"},"canonical_sha256":"352a5101699441efbfc88d9da21109b25966957fc7545312c42a0596a080ab69","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:57:08.050905Z","signature_b64":"CnIqYC5dpqsmZdv1WtojZS5C20mu6GEZcCBWlR+zmVX9crhVn+c8j4I+qbgdGaq2zDuei5X2BxEJKbz6m2ZyCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"352a5101699441efbfc88d9da21109b25966957fc7545312c42a0596a080ab69","last_reissued_at":"2026-05-18T02:57:08.050190Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:57:08.050190Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.6574","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":"2026-05-18T02:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6v5IvrB/EZaBDhvzd5r8O1Dsc1KYXTBFLx8uHd2lwV1E2jhf9BAuRImOX+vMNrm9lazTnthaiHu5IC6AZ6UJBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T04:25:00.857392Z"},"content_sha256":"b6041d6ef2b106dc802eafaa7b2f5d6774f101fc605870c4002af496a5fea783","schema_version":"1.0","event_id":"sha256:b6041d6ef2b106dc802eafaa7b2f5d6774f101fc605870c4002af496a5fea783"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:GUVFCALJSRA67P6IRWO2EEIJWJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How river rocks round: resolving the shape-size paradox","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"physics.geo-ph","authors_text":"A.\\'A. Sipos, \\'A. T\\\"or\\\"ok, D. J. Jerolmack, G. Domokos","submitted_at":"2013-11-26T07:45:49Z","abstract_excerpt":"River-bed sediments display two universal downstream trends: fining, in which particle size decreases; and rounding, where pebble shapes evolve toward ellipsoids. Rounding is known to result from transport-induced abrasion; however many researchers argue that the contribution of abrasion to downstream fining is negligible. This presents a paradox: downstream shape change indicates substantial abrasion, while size change apparently rules it out. Here we use laboratory experiments and numerical modeling to show quantitatively that pebble abrasion is a curvature-driven flow problem. As a conseque"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.6574","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":"2026-05-18T02:57:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"esBJF/AIAtydL6MSUtj1xRTnwXef7ErVgyZLJd6Mai9G6Pwite1UQqm6EPez2xYyE3PqvgTkosRerxyxgyMbBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-23T04:25:00.857740Z"},"content_sha256":"819979dfd9d58c8bcb10e7b081ecb3c2c3d74c4a26cc3b50a483bd0c96184f93","schema_version":"1.0","event_id":"sha256:819979dfd9d58c8bcb10e7b081ecb3c2c3d74c4a26cc3b50a483bd0c96184f93"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/bundle.json","state_url":"https://pith.science/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/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":"2026-06-23T04:25:00Z","links":{"resolver":"https://pith.science/pith/GUVFCALJSRA67P6IRWO2EEIJWJ","bundle":"https://pith.science/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/bundle.json","state":"https://pith.science/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GUVFCALJSRA67P6IRWO2EEIJWJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:GUVFCALJSRA67P6IRWO2EEIJWJ","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":"2fffccfa7f3d93f3edd64e0f9540d0bd94897149f255c07b8472f7e892eda150","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2013-11-26T07:45:49Z","title_canon_sha256":"0b43dce9c4a93acca8ff9138a173f2619c60c69985c971c83fe0e522f2657741"},"schema_version":"1.0","source":{"id":"1311.6574","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.6574","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"arxiv_version","alias_value":"1311.6574v2","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.6574","created_at":"2026-05-18T02:57:08Z"},{"alias_kind":"pith_short_12","alias_value":"GUVFCALJSRA6","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GUVFCALJSRA67P6I","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GUVFCALJ","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:819979dfd9d58c8bcb10e7b081ecb3c2c3d74c4a26cc3b50a483bd0c96184f93","target":"graph","created_at":"2026-05-18T02:57:08Z","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":"River-bed sediments display two universal downstream trends: fining, in which particle size decreases; and rounding, where pebble shapes evolve toward ellipsoids. Rounding is known to result from transport-induced abrasion; however many researchers argue that the contribution of abrasion to downstream fining is negligible. This presents a paradox: downstream shape change indicates substantial abrasion, while size change apparently rules it out. Here we use laboratory experiments and numerical modeling to show quantitatively that pebble abrasion is a curvature-driven flow problem. As a conseque","authors_text":"A.\\'A. Sipos, \\'A. T\\\"or\\\"ok, D. J. Jerolmack, G. Domokos","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2013-11-26T07:45:49Z","title":"How river rocks round: resolving the shape-size paradox"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.6574","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:b6041d6ef2b106dc802eafaa7b2f5d6774f101fc605870c4002af496a5fea783","target":"record","created_at":"2026-05-18T02:57:08Z","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":"2fffccfa7f3d93f3edd64e0f9540d0bd94897149f255c07b8472f7e892eda150","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.geo-ph","submitted_at":"2013-11-26T07:45:49Z","title_canon_sha256":"0b43dce9c4a93acca8ff9138a173f2619c60c69985c971c83fe0e522f2657741"},"schema_version":"1.0","source":{"id":"1311.6574","kind":"arxiv","version":2}},"canonical_sha256":"352a5101699441efbfc88d9da21109b25966957fc7545312c42a0596a080ab69","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"352a5101699441efbfc88d9da21109b25966957fc7545312c42a0596a080ab69","first_computed_at":"2026-05-18T02:57:08.050190Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:57:08.050190Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CnIqYC5dpqsmZdv1WtojZS5C20mu6GEZcCBWlR+zmVX9crhVn+c8j4I+qbgdGaq2zDuei5X2BxEJKbz6m2ZyCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:57:08.050905Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.6574","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b6041d6ef2b106dc802eafaa7b2f5d6774f101fc605870c4002af496a5fea783","sha256:819979dfd9d58c8bcb10e7b081ecb3c2c3d74c4a26cc3b50a483bd0c96184f93"],"state_sha256":"b27965e7826101a6586438ba4709933ff2a831b67536b3dae51d3962b2634ca7"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ozsXDsognEEyIzbhpviGhwVtoUopRFNwLMmO02xCbyTrAxHHJPCiIsV/c0cVeGko06UsO33r/4mHMURHfCswAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-23T04:25:00.859921Z","bundle_sha256":"8c284ed8e6c29cd37c7a11ed41a9bbefce66dd3c332eb8ec0f158531e7d78a6b"}}