{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:W2W7YB42HQPXGGF2F6UZWXRMCL","short_pith_number":"pith:W2W7YB42","canonical_record":{"source":{"id":"1307.0670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2013-07-02T10:29:39Z","cross_cats_sorted":["q-bio.CB"],"title_canon_sha256":"8a5c61b5deca21b3ba5f8ec41b9d3ff665f3a204a80b3b872ed2cd020f489600","abstract_canon_sha256":"e4fe9568fbb9b888575485dad35bd90cbc4945561cb82b0814b5e53ed156bd13"},"schema_version":"1.0"},"canonical_sha256":"b6adfc079a3c1f7318ba2fa99b5e2c12f612a3b8cced19ee3e1b93efd57f378d","source":{"kind":"arxiv","id":"1307.0670","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.0670","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"arxiv_version","alias_value":"1307.0670v1","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.0670","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"pith_short_12","alias_value":"W2W7YB42HQPX","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"W2W7YB42HQPXGGF2","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"W2W7YB42","created_at":"2026-05-18T12:28:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:W2W7YB42HQPXGGF2F6UZWXRMCL","target":"record","payload":{"canonical_record":{"source":{"id":"1307.0670","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2013-07-02T10:29:39Z","cross_cats_sorted":["q-bio.CB"],"title_canon_sha256":"8a5c61b5deca21b3ba5f8ec41b9d3ff665f3a204a80b3b872ed2cd020f489600","abstract_canon_sha256":"e4fe9568fbb9b888575485dad35bd90cbc4945561cb82b0814b5e53ed156bd13"},"schema_version":"1.0"},"canonical_sha256":"b6adfc079a3c1f7318ba2fa99b5e2c12f612a3b8cced19ee3e1b93efd57f378d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:00:23.137890Z","signature_b64":"FEzWYmlq0TXAd8DQGhirWT2gSPLQRCbVGrTrPjjt2exkDb5rmub8Vn+ngPI1l3k0K8ZmmqzsFQBzD0m6tgspAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6adfc079a3c1f7318ba2fa99b5e2c12f612a3b8cced19ee3e1b93efd57f378d","last_reissued_at":"2026-05-18T00:00:23.137398Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:00:23.137398Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1307.0670","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":"2026-05-18T00:00:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"twqRWcBtlTWGfTbogGZrflLh2b+4AB+USuyysbb3L36C7JNEGpGXikmJbR8dmpEz0Zef3Fr73CIPD1B4uV6tAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T22:30:15.201081Z"},"content_sha256":"0fca7cdb81cef0e774375e9ffcb6ba67849e65c656bd6e4dd34b2226306d8a1a","schema_version":"1.0","event_id":"sha256:0fca7cdb81cef0e774375e9ffcb6ba67849e65c656bd6e4dd34b2226306d8a1a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:W2W7YB42HQPXGGF2F6UZWXRMCL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"An active poroelastic model for mechanochemical patterns in protoplasmic droplets of Physarum polycephalum","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["q-bio.CB"],"primary_cat":"nlin.PS","authors_text":"Harald Engel, Markus B\\\"ar, Markus Radszuweit","submitted_at":"2013-07-02T10:29:39Z","abstract_excerpt":"Motivated by recent experimental studies, we derive and analyze a twodimensional model for the contraction patterns observed in protoplasmic droplets of Physarum polycephalum. The model couples a model of an active poroelastic two-phase medium with equations describing the spatiotemporal dynamics of the intracellular free calcium concentration. The poroelastic medium is assumed to consist of an active viscoelastic solid representing the cytoskeleton and a viscous fluid describing the cytosol. The model equations for the poroelastic medium are obtained from continuum force-balance equations tha"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.0670","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":"2026-05-18T00:00:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"74B1xypiI27o/EZnPt3iwSaXoN/8v9Zz3wo2Uzyv/VVVQbzWPVQniUZFSpBW43LDKIzqv/Xrfb9GNka8FLn4Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T22:30:15.201849Z"},"content_sha256":"79b7777c637fc53dbd0b705ccd872cc8e10208a7730e5c1acf061610df9ac7ab","schema_version":"1.0","event_id":"sha256:79b7777c637fc53dbd0b705ccd872cc8e10208a7730e5c1acf061610df9ac7ab"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/bundle.json","state_url":"https://pith.science/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/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":"2026-05-31T22:30:15Z","links":{"resolver":"https://pith.science/pith/W2W7YB42HQPXGGF2F6UZWXRMCL","bundle":"https://pith.science/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/bundle.json","state":"https://pith.science/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W2W7YB42HQPXGGF2F6UZWXRMCL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:W2W7YB42HQPXGGF2F6UZWXRMCL","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":"e4fe9568fbb9b888575485dad35bd90cbc4945561cb82b0814b5e53ed156bd13","cross_cats_sorted":["q-bio.CB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2013-07-02T10:29:39Z","title_canon_sha256":"8a5c61b5deca21b3ba5f8ec41b9d3ff665f3a204a80b3b872ed2cd020f489600"},"schema_version":"1.0","source":{"id":"1307.0670","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1307.0670","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"arxiv_version","alias_value":"1307.0670v1","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1307.0670","created_at":"2026-05-18T00:00:23Z"},{"alias_kind":"pith_short_12","alias_value":"W2W7YB42HQPX","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_16","alias_value":"W2W7YB42HQPXGGF2","created_at":"2026-05-18T12:28:04Z"},{"alias_kind":"pith_short_8","alias_value":"W2W7YB42","created_at":"2026-05-18T12:28:04Z"}],"graph_snapshots":[{"event_id":"sha256:79b7777c637fc53dbd0b705ccd872cc8e10208a7730e5c1acf061610df9ac7ab","target":"graph","created_at":"2026-05-18T00:00:23Z","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":"Motivated by recent experimental studies, we derive and analyze a twodimensional model for the contraction patterns observed in protoplasmic droplets of Physarum polycephalum. The model couples a model of an active poroelastic two-phase medium with equations describing the spatiotemporal dynamics of the intracellular free calcium concentration. The poroelastic medium is assumed to consist of an active viscoelastic solid representing the cytoskeleton and a viscous fluid describing the cytosol. The model equations for the poroelastic medium are obtained from continuum force-balance equations tha","authors_text":"Harald Engel, Markus B\\\"ar, Markus Radszuweit","cross_cats":["q-bio.CB"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2013-07-02T10:29:39Z","title":"An active poroelastic model for mechanochemical patterns in protoplasmic droplets of Physarum polycephalum"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1307.0670","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":"sha256:0fca7cdb81cef0e774375e9ffcb6ba67849e65c656bd6e4dd34b2226306d8a1a","target":"record","created_at":"2026-05-18T00:00:23Z","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":"e4fe9568fbb9b888575485dad35bd90cbc4945561cb82b0814b5e53ed156bd13","cross_cats_sorted":["q-bio.CB"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"nlin.PS","submitted_at":"2013-07-02T10:29:39Z","title_canon_sha256":"8a5c61b5deca21b3ba5f8ec41b9d3ff665f3a204a80b3b872ed2cd020f489600"},"schema_version":"1.0","source":{"id":"1307.0670","kind":"arxiv","version":1}},"canonical_sha256":"b6adfc079a3c1f7318ba2fa99b5e2c12f612a3b8cced19ee3e1b93efd57f378d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6adfc079a3c1f7318ba2fa99b5e2c12f612a3b8cced19ee3e1b93efd57f378d","first_computed_at":"2026-05-18T00:00:23.137398Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:00:23.137398Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"FEzWYmlq0TXAd8DQGhirWT2gSPLQRCbVGrTrPjjt2exkDb5rmub8Vn+ngPI1l3k0K8ZmmqzsFQBzD0m6tgspAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:00:23.137890Z","signed_message":"canonical_sha256_bytes"},"source_id":"1307.0670","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:0fca7cdb81cef0e774375e9ffcb6ba67849e65c656bd6e4dd34b2226306d8a1a","sha256:79b7777c637fc53dbd0b705ccd872cc8e10208a7730e5c1acf061610df9ac7ab"],"state_sha256":"c56b16c9b0aa7817f78772315fc61200d4c1665493819779f66e956b41a96652"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"v4YjgXkxqNPH7yp351F2O0f7dhJN8PCDxnOrqryURj9ofi5se5fVc+9MU6bMljDWPt+mv6mFAWy1vWZ4Ix01AQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T22:30:15.206093Z","bundle_sha256":"94e4e36703846b790f2052c6744d66f5d33cf7fbb73afeeb18177eb2a6ec4a81"}}