{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:I2UJTZXFIRLGY5FXQURFZCQHDE","short_pith_number":"pith:I2UJTZXF","canonical_record":{"source":{"id":"0807.2719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-07-17T08:06:50Z","cross_cats_sorted":["physics.class-ph"],"title_canon_sha256":"f6064862631d3618901d56d10d25f7b873e417620b01374aa1668fa4fd05bd68","abstract_canon_sha256":"d97226e345c5023aee9d10d8e37773a212d7a05acf8c813571b3495caf6e796b"},"schema_version":"1.0"},"canonical_sha256":"46a899e6e544566c74b785225c8a07190f0b4eb04617f62ad8cb261713753632","source":{"kind":"arxiv","id":"0807.2719","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2719","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2719v1","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2719","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"pith_short_12","alias_value":"I2UJTZXFIRLG","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"I2UJTZXFIRLGY5FX","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"I2UJTZXF","created_at":"2026-05-18T12:25:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:I2UJTZXFIRLGY5FXQURFZCQHDE","target":"record","payload":{"canonical_record":{"source":{"id":"0807.2719","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-07-17T08:06:50Z","cross_cats_sorted":["physics.class-ph"],"title_canon_sha256":"f6064862631d3618901d56d10d25f7b873e417620b01374aa1668fa4fd05bd68","abstract_canon_sha256":"d97226e345c5023aee9d10d8e37773a212d7a05acf8c813571b3495caf6e796b"},"schema_version":"1.0"},"canonical_sha256":"46a899e6e544566c74b785225c8a07190f0b4eb04617f62ad8cb261713753632","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:10:44.428564Z","signature_b64":"Pht52u65HwZedmjdwr8Z8lS5NtznxOcm9W8BqRAsJkG4ppDDY5o8gdLVm2/hem682MkTddi29Bhl5vb9oyPYAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"46a899e6e544566c74b785225c8a07190f0b4eb04617f62ad8cb261713753632","last_reissued_at":"2026-05-18T03:10:44.428066Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:10:44.428066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0807.2719","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":"2026-05-18T03:10:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1eqCOhPtuG42i9G5/Otapo8wfXO/B75WH81zXp4oXwUx0CWdB164SRDAC89GBwdXOQpvBzGEIB4pWJb0zbkHBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T22:13:01.914599Z"},"content_sha256":"4fd67ac16378456d1276014fd871f9e773ae96ccbde6c79c77b5172acb383259","schema_version":"1.0","event_id":"sha256:4fd67ac16378456d1276014fd871f9e773ae96ccbde6c79c77b5172acb383259"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:I2UJTZXFIRLGY5FXQURFZCQHDE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Attractive and repulsive cracks in a heterogeneous material","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.class-ph"],"primary_cat":"cond-mat.mtrl-sci","authors_text":"Guillaume Huillard (Phys-ENS), Lo\\\"ic Vanel (Phys-ENS), Pierre-Philippe Cortet (Phys-ENS), Sergio Ciliberto (Phys-ENS)","submitted_at":"2008-07-17T08:06:50Z","abstract_excerpt":"We study experimentally the paths of an assembly of cracks growing in interaction in a heterogeneous two-dimensional elastic brittle material submitted to uniaxial stress. For a given initial crack assembly geometry, we observe two types of crack path. The first one corresponds to a repulsion followed by an attraction on one end of the crack and a tip to tip attraction on the other end. The second one corresponds to a pure attraction. Only one of the crack path type is observed in a given sample. Thus, selection between the two types appears as a statistical collective process."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2719","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":"2026-05-18T03:10:44Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"k3MMhE0yfoc8CI3de+hbBkYWM5oCQVYZn4nj/GR35w9ZAGu2Oh/IzRlnUOh1LfTYKlFyyem67cqHg97xkbSABg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T22:13:01.915190Z"},"content_sha256":"81c58ef5b6d5554a3c8ea534234a8bd08dad59c63b584086cb5506c825a4a2f1","schema_version":"1.0","event_id":"sha256:81c58ef5b6d5554a3c8ea534234a8bd08dad59c63b584086cb5506c825a4a2f1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/bundle.json","state_url":"https://pith.science/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/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":"2026-06-05T22:13:01Z","links":{"resolver":"https://pith.science/pith/I2UJTZXFIRLGY5FXQURFZCQHDE","bundle":"https://pith.science/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/bundle.json","state":"https://pith.science/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/I2UJTZXFIRLGY5FXQURFZCQHDE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:I2UJTZXFIRLGY5FXQURFZCQHDE","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":"d97226e345c5023aee9d10d8e37773a212d7a05acf8c813571b3495caf6e796b","cross_cats_sorted":["physics.class-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-07-17T08:06:50Z","title_canon_sha256":"f6064862631d3618901d56d10d25f7b873e417620b01374aa1668fa4fd05bd68"},"schema_version":"1.0","source":{"id":"0807.2719","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0807.2719","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"arxiv_version","alias_value":"0807.2719v1","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0807.2719","created_at":"2026-05-18T03:10:44Z"},{"alias_kind":"pith_short_12","alias_value":"I2UJTZXFIRLG","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_16","alias_value":"I2UJTZXFIRLGY5FX","created_at":"2026-05-18T12:25:57Z"},{"alias_kind":"pith_short_8","alias_value":"I2UJTZXF","created_at":"2026-05-18T12:25:57Z"}],"graph_snapshots":[{"event_id":"sha256:81c58ef5b6d5554a3c8ea534234a8bd08dad59c63b584086cb5506c825a4a2f1","target":"graph","created_at":"2026-05-18T03:10:44Z","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":"We study experimentally the paths of an assembly of cracks growing in interaction in a heterogeneous two-dimensional elastic brittle material submitted to uniaxial stress. For a given initial crack assembly geometry, we observe two types of crack path. The first one corresponds to a repulsion followed by an attraction on one end of the crack and a tip to tip attraction on the other end. The second one corresponds to a pure attraction. Only one of the crack path type is observed in a given sample. Thus, selection between the two types appears as a statistical collective process.","authors_text":"Guillaume Huillard (Phys-ENS), Lo\\\"ic Vanel (Phys-ENS), Pierre-Philippe Cortet (Phys-ENS), Sergio Ciliberto (Phys-ENS)","cross_cats":["physics.class-ph"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-07-17T08:06:50Z","title":"Attractive and repulsive cracks in a heterogeneous material"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0807.2719","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":"sha256:4fd67ac16378456d1276014fd871f9e773ae96ccbde6c79c77b5172acb383259","target":"record","created_at":"2026-05-18T03:10:44Z","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":"d97226e345c5023aee9d10d8e37773a212d7a05acf8c813571b3495caf6e796b","cross_cats_sorted":["physics.class-ph"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.mtrl-sci","submitted_at":"2008-07-17T08:06:50Z","title_canon_sha256":"f6064862631d3618901d56d10d25f7b873e417620b01374aa1668fa4fd05bd68"},"schema_version":"1.0","source":{"id":"0807.2719","kind":"arxiv","version":1}},"canonical_sha256":"46a899e6e544566c74b785225c8a07190f0b4eb04617f62ad8cb261713753632","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"46a899e6e544566c74b785225c8a07190f0b4eb04617f62ad8cb261713753632","first_computed_at":"2026-05-18T03:10:44.428066Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:10:44.428066Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Pht52u65HwZedmjdwr8Z8lS5NtznxOcm9W8BqRAsJkG4ppDDY5o8gdLVm2/hem682MkTddi29Bhl5vb9oyPYAA==","signature_status":"signed_v1","signed_at":"2026-05-18T03:10:44.428564Z","signed_message":"canonical_sha256_bytes"},"source_id":"0807.2719","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4fd67ac16378456d1276014fd871f9e773ae96ccbde6c79c77b5172acb383259","sha256:81c58ef5b6d5554a3c8ea534234a8bd08dad59c63b584086cb5506c825a4a2f1"],"state_sha256":"ef94c48410723bdc540a435910f373d399e4a41f1f696fa5893adb00dbc2cfc6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"L516Ix3QMItGsQaBGjW4XYsYDAU7tNkf6qidslJzqbdp+tlYoEgAXJnGFcF96NSahtqs2AVMpFH80pEhsptZCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T22:13:01.918487Z","bundle_sha256":"3c789091e407121c04fd9c6d6d79993bdb9f898296aeff908914b61f7e27b0c3"}}