{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2023:Q2UEPE5XVPK3ZEKVH6Y55WSMP3","short_pith_number":"pith:Q2UEPE5X","canonical_record":{"source":{"id":"2303.02934","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.GR","submitted_at":"2023-03-06T07:07:33Z","cross_cats_sorted":[],"title_canon_sha256":"e6fc031dbd350546cf171a24532f3eacfc30f6601cf305a7c05fe245a4847cb5","abstract_canon_sha256":"5fbd8b35a3161c556f669cdf17b99401eabecc27bd4dfe89b5e8e41d01edaf5a"},"schema_version":"1.0"},"canonical_sha256":"86a84793b7abd5bc91553fb1deda4c7edecc7eab77d06452480452c30c960ee9","source":{"kind":"arxiv","id":"2303.02934","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2303.02934","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"arxiv_version","alias_value":"2303.02934v1","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.02934","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_12","alias_value":"Q2UEPE5XVPK3","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_16","alias_value":"Q2UEPE5XVPK3ZEKV","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_8","alias_value":"Q2UEPE5X","created_at":"2026-07-05T05:48:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2023:Q2UEPE5XVPK3ZEKVH6Y55WSMP3","target":"record","payload":{"canonical_record":{"source":{"id":"2303.02934","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.GR","submitted_at":"2023-03-06T07:07:33Z","cross_cats_sorted":[],"title_canon_sha256":"e6fc031dbd350546cf171a24532f3eacfc30f6601cf305a7c05fe245a4847cb5","abstract_canon_sha256":"5fbd8b35a3161c556f669cdf17b99401eabecc27bd4dfe89b5e8e41d01edaf5a"},"schema_version":"1.0"},"canonical_sha256":"86a84793b7abd5bc91553fb1deda4c7edecc7eab77d06452480452c30c960ee9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T05:48:17.112198Z","signature_b64":"9nqf1TQM3YoSUyKiDxdbSB2gVr9rCIRUyTO/l2uSEPKypxLda1v6tSQJuFB/JNct+am8ZOnPPF1Gx0cj2kSvDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"86a84793b7abd5bc91553fb1deda4c7edecc7eab77d06452480452c30c960ee9","last_reissued_at":"2026-07-05T05:48:17.111659Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T05:48:17.111659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2303.02934","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":"2026-07-05T05:48:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AFkT3ZEwGlmh5HS5dy3nND/Pk0/UVnuBLrjFO5jLZA5+GUAdxOqc6Pe/2zz3NtcGWyr1Rj6uFgY4T+Rh3XgZBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T08:05:00.464650Z"},"content_sha256":"2ceef4713876abe3ad4f30d9928b691e826031532b09981530f0443ce126f26d","schema_version":"1.0","event_id":"sha256:2ceef4713876abe3ad4f30d9928b691e826031532b09981530f0443ce126f26d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2023:Q2UEPE5XVPK3ZEKVH6Y55WSMP3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Graphical Modeling and Animation of Brittle Fracture","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.GR","authors_text":"James F. O'Brien, Jessica K. Hodgins","submitted_at":"2023-03-06T07:07:33Z","abstract_excerpt":"In this paper, we augment existing techniques for simulating flexible objects to include models for crack initiation and propagation in three-dimensional volumes. By analyzing the stress tensors computed over a finite element model, the simulation determines where cracks should initiate and in what directions they should propagate. We demonstrate our results with animations of breaking bowls, cracking walls, and objects that fracture when they collide. By varying the shape of the objects, the material properties, and the initial conditions of the simulations, we can create strikingly different"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.02934","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2303.02934/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":"2026-07-05T05:48:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"g29hGvDsme0c0RLti1aOLJWlNmk5dct9Eji+nK9b6UdO+uyTtZaNXpxMDjSPv9Im3z1AFwa5O+JK/7UGD1ziCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-24T08:05:00.465026Z"},"content_sha256":"4b3978b9ceaf1a5022d9b8cdda97f60f1fc32bcb535d1ca75324b188b5676041","schema_version":"1.0","event_id":"sha256:4b3978b9ceaf1a5022d9b8cdda97f60f1fc32bcb535d1ca75324b188b5676041"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/bundle.json","state_url":"https://pith.science/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/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":"2026-07-24T08:05:00Z","links":{"resolver":"https://pith.science/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3","bundle":"https://pith.science/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/bundle.json","state":"https://pith.science/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/Q2UEPE5XVPK3ZEKVH6Y55WSMP3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2023:Q2UEPE5XVPK3ZEKVH6Y55WSMP3","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":"5fbd8b35a3161c556f669cdf17b99401eabecc27bd4dfe89b5e8e41d01edaf5a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.GR","submitted_at":"2023-03-06T07:07:33Z","title_canon_sha256":"e6fc031dbd350546cf171a24532f3eacfc30f6601cf305a7c05fe245a4847cb5"},"schema_version":"1.0","source":{"id":"2303.02934","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2303.02934","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"arxiv_version","alias_value":"2303.02934v1","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2303.02934","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_12","alias_value":"Q2UEPE5XVPK3","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_16","alias_value":"Q2UEPE5XVPK3ZEKV","created_at":"2026-07-05T05:48:17Z"},{"alias_kind":"pith_short_8","alias_value":"Q2UEPE5X","created_at":"2026-07-05T05:48:17Z"}],"graph_snapshots":[{"event_id":"sha256:4b3978b9ceaf1a5022d9b8cdda97f60f1fc32bcb535d1ca75324b188b5676041","target":"graph","created_at":"2026-07-05T05:48:17Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2303.02934/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"In this paper, we augment existing techniques for simulating flexible objects to include models for crack initiation and propagation in three-dimensional volumes. By analyzing the stress tensors computed over a finite element model, the simulation determines where cracks should initiate and in what directions they should propagate. We demonstrate our results with animations of breaking bowls, cracking walls, and objects that fracture when they collide. By varying the shape of the objects, the material properties, and the initial conditions of the simulations, we can create strikingly different","authors_text":"James F. O'Brien, Jessica K. Hodgins","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.GR","submitted_at":"2023-03-06T07:07:33Z","title":"Graphical Modeling and Animation of Brittle Fracture"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2303.02934","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":"sha256:2ceef4713876abe3ad4f30d9928b691e826031532b09981530f0443ce126f26d","target":"record","created_at":"2026-07-05T05:48:17Z","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":"5fbd8b35a3161c556f669cdf17b99401eabecc27bd4dfe89b5e8e41d01edaf5a","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.GR","submitted_at":"2023-03-06T07:07:33Z","title_canon_sha256":"e6fc031dbd350546cf171a24532f3eacfc30f6601cf305a7c05fe245a4847cb5"},"schema_version":"1.0","source":{"id":"2303.02934","kind":"arxiv","version":1}},"canonical_sha256":"86a84793b7abd5bc91553fb1deda4c7edecc7eab77d06452480452c30c960ee9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"86a84793b7abd5bc91553fb1deda4c7edecc7eab77d06452480452c30c960ee9","first_computed_at":"2026-07-05T05:48:17.111659Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T05:48:17.111659Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9nqf1TQM3YoSUyKiDxdbSB2gVr9rCIRUyTO/l2uSEPKypxLda1v6tSQJuFB/JNct+am8ZOnPPF1Gx0cj2kSvDg==","signature_status":"signed_v1","signed_at":"2026-07-05T05:48:17.112198Z","signed_message":"canonical_sha256_bytes"},"source_id":"2303.02934","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2ceef4713876abe3ad4f30d9928b691e826031532b09981530f0443ce126f26d","sha256:4b3978b9ceaf1a5022d9b8cdda97f60f1fc32bcb535d1ca75324b188b5676041"],"state_sha256":"e2dd84b53e24f54d909c6187e99e97a0be43865d68c8b6575472fe32c1f6567a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2RxalZIwSR+9y2oAxsJvfnnKtmnIn1yh/zpAfFPs7M1jDmsXgRhGyWgjZuPz3ecFajlguT0zXyqCjfCc6oAADA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-24T08:05:00.467133Z","bundle_sha256":"fa17b0aafe8af5bf011bb3144228c4cdcee0ef230bad9587323ae310bd3e4d44"}}