{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:YCZTFZLMNQVCZXHVNQEI2WYG6M","short_pith_number":"pith:YCZTFZLM","canonical_record":{"source":{"id":"2509.08872","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.IV","submitted_at":"2025-09-10T14:53:31Z","cross_cats_sorted":["cs.LG","physics.med-ph"],"title_canon_sha256":"3c6373ec39211f4211b427f334d3c81dbd6315347db000638955d05102c281e1","abstract_canon_sha256":"17c4d71fe1740d28c4faceba0b4b8e5f0d1ed98630aad6c1b40ba684fd5021ec"},"schema_version":"1.0"},"canonical_sha256":"c0b332e56c6c2a2cdcf56c088d5b06f3137f480e19218892bc9f672f0dd988f2","source":{"kind":"arxiv","id":"2509.08872","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.08872","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"2509.08872v1","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.08872","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"YCZTFZLMNQVC","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_16","alias_value":"YCZTFZLMNQVCZXHV","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_8","alias_value":"YCZTFZLM","created_at":"2026-07-05T12:08:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:YCZTFZLMNQVCZXHVNQEI2WYG6M","target":"record","payload":{"canonical_record":{"source":{"id":"2509.08872","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.IV","submitted_at":"2025-09-10T14:53:31Z","cross_cats_sorted":["cs.LG","physics.med-ph"],"title_canon_sha256":"3c6373ec39211f4211b427f334d3c81dbd6315347db000638955d05102c281e1","abstract_canon_sha256":"17c4d71fe1740d28c4faceba0b4b8e5f0d1ed98630aad6c1b40ba684fd5021ec"},"schema_version":"1.0"},"canonical_sha256":"c0b332e56c6c2a2cdcf56c088d5b06f3137f480e19218892bc9f672f0dd988f2","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:08:38.420481Z","signature_b64":"h3pQwceAngbS8Yq/EOtVd/TwcwOTwRnB+vmkrUwM3OgR1BJQt4Z6DunI8q6OMgI21X6fxEXGJTB9UfEkrhwvDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c0b332e56c6c2a2cdcf56c088d5b06f3137f480e19218892bc9f672f0dd988f2","last_reissued_at":"2026-07-05T12:08:38.419983Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:08:38.419983Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2509.08872","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":"2026-07-05T12:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"cX1Mpt/xRA8HEU3NAGlG3ampCThuh6bDuacFxMeuW8Ij+EYnN9hIYLGgu8ALdZ/abaO1QhUI/4/eSIuTP7CQCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:08:56.509697Z"},"content_sha256":"a1f0cbdbce5c15c26b6d276a0d4cb05b1eba0ee204ba17a4133824b3811dba8e","schema_version":"1.0","event_id":"sha256:a1f0cbdbce5c15c26b6d276a0d4cb05b1eba0ee204ba17a4133824b3811dba8e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:YCZTFZLMNQVCZXHVNQEI2WYG6M","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"WarpPINN-fibers: improved cardiac strain estimation from cine-MR with physics-informed neural networks","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","headline":"","cross_cats":["cs.LG","physics.med-ph"],"primary_cat":"eess.IV","authors_text":"Felipe \\'Alvarez Barrientos, Francisco Sahli Costabal, Isabeau Sirven, Tom\\'as Banduc","submitted_at":"2025-09-10T14:53:31Z","abstract_excerpt":"The contractile motion of the heart is strongly determined by the distribution of the fibers that constitute cardiac tissue. Strain analysis informed with the orientation of fibers allows to describe several pathologies that are typically associated with impaired mechanics of the myocardium, such as cardiovascular disease. Several methods have been developed to estimate strain-derived metrics from traditional imaging techniques. However, the physical models underlying these methods do not include fiber mechanics, restricting their capacity to accurately explain cardiac function. In this work, "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.08872","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/2509.08872/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":"2026-07-05T12:08:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Mb06Ceitg/YhpIBf7HnE9UthWfRuyE1+/jeosb9GBHqzDVp/r38xEepmqeO/aOTgwo+Ce9oR6FZX3e2ANkFADA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T17:08:56.510198Z"},"content_sha256":"7e6600ec840dee7d4cd52730f97615fe51d1e6d7b28f4d58e2cf70df11ecddab","schema_version":"1.0","event_id":"sha256:7e6600ec840dee7d4cd52730f97615fe51d1e6d7b28f4d58e2cf70df11ecddab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/bundle.json","state_url":"https://pith.science/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/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":"2026-08-07T17:08:56Z","links":{"resolver":"https://pith.science/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M","bundle":"https://pith.science/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/bundle.json","state":"https://pith.science/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YCZTFZLMNQVCZXHVNQEI2WYG6M/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:YCZTFZLMNQVCZXHVNQEI2WYG6M","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":"17c4d71fe1740d28c4faceba0b4b8e5f0d1ed98630aad6c1b40ba684fd5021ec","cross_cats_sorted":["cs.LG","physics.med-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.IV","submitted_at":"2025-09-10T14:53:31Z","title_canon_sha256":"3c6373ec39211f4211b427f334d3c81dbd6315347db000638955d05102c281e1"},"schema_version":"1.0","source":{"id":"2509.08872","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.08872","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"arxiv_version","alias_value":"2509.08872v1","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.08872","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_12","alias_value":"YCZTFZLMNQVC","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_16","alias_value":"YCZTFZLMNQVCZXHV","created_at":"2026-07-05T12:08:38Z"},{"alias_kind":"pith_short_8","alias_value":"YCZTFZLM","created_at":"2026-07-05T12:08:38Z"}],"graph_snapshots":[{"event_id":"sha256:7e6600ec840dee7d4cd52730f97615fe51d1e6d7b28f4d58e2cf70df11ecddab","target":"graph","created_at":"2026-07-05T12:08:38Z","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/2509.08872/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The contractile motion of the heart is strongly determined by the distribution of the fibers that constitute cardiac tissue. Strain analysis informed with the orientation of fibers allows to describe several pathologies that are typically associated with impaired mechanics of the myocardium, such as cardiovascular disease. Several methods have been developed to estimate strain-derived metrics from traditional imaging techniques. However, the physical models underlying these methods do not include fiber mechanics, restricting their capacity to accurately explain cardiac function. In this work, ","authors_text":"Felipe \\'Alvarez Barrientos, Francisco Sahli Costabal, Isabeau Sirven, Tom\\'as Banduc","cross_cats":["cs.LG","physics.med-ph"],"headline":"","license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.IV","submitted_at":"2025-09-10T14:53:31Z","title":"WarpPINN-fibers: improved cardiac strain estimation from cine-MR with physics-informed neural networks"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.08872","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:a1f0cbdbce5c15c26b6d276a0d4cb05b1eba0ee204ba17a4133824b3811dba8e","target":"record","created_at":"2026-07-05T12:08:38Z","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":"17c4d71fe1740d28c4faceba0b4b8e5f0d1ed98630aad6c1b40ba684fd5021ec","cross_cats_sorted":["cs.LG","physics.med-ph"],"license":"http://creativecommons.org/licenses/by-nc-nd/4.0/","primary_cat":"eess.IV","submitted_at":"2025-09-10T14:53:31Z","title_canon_sha256":"3c6373ec39211f4211b427f334d3c81dbd6315347db000638955d05102c281e1"},"schema_version":"1.0","source":{"id":"2509.08872","kind":"arxiv","version":1}},"canonical_sha256":"c0b332e56c6c2a2cdcf56c088d5b06f3137f480e19218892bc9f672f0dd988f2","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0b332e56c6c2a2cdcf56c088d5b06f3137f480e19218892bc9f672f0dd988f2","first_computed_at":"2026-07-05T12:08:38.419983Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:08:38.419983Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h3pQwceAngbS8Yq/EOtVd/TwcwOTwRnB+vmkrUwM3OgR1BJQt4Z6DunI8q6OMgI21X6fxEXGJTB9UfEkrhwvDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T12:08:38.420481Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.08872","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a1f0cbdbce5c15c26b6d276a0d4cb05b1eba0ee204ba17a4133824b3811dba8e","sha256:7e6600ec840dee7d4cd52730f97615fe51d1e6d7b28f4d58e2cf70df11ecddab"],"state_sha256":"7faf41d00cd7483c37fb6ef09241caaa9f45a82001e45b575d2d6514ef72bc75"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yyLAEd50OeumuUiZTaYWQS2/KtdAWzUNIvxxGXDjMO/89+V185UPGFURa4uo/i86IHCxTM3bS8hhJzgz9JKxDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T17:08:56.514754Z","bundle_sha256":"7b84c8594c115c9b5cc4896a0c7a904dba20b1e9ee0456418c8eab74a58421c5"}}