{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:CPA6IXZMLWGJXSUY3XQ4SRG7DR","short_pith_number":"pith:CPA6IXZM","canonical_record":{"source":{"id":"1509.03504","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2015-07-22T00:09:31Z","cross_cats_sorted":["physics.flu-dyn","q-bio.QM"],"title_canon_sha256":"c1bbb4c9010b736d886241e0341031acb2430e6b8f6c830c5191503d7b786aca","abstract_canon_sha256":"a714f62a128c8defcc0b2cf828cf5c3769fc3e2c295965c0b0c70d746d860e66"},"schema_version":"1.0"},"canonical_sha256":"13c1e45f2c5d8c9bca98dde1c944df1c7f515892121638a2e927fa7190015695","source":{"kind":"arxiv","id":"1509.03504","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.03504","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"arxiv_version","alias_value":"1509.03504v1","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.03504","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"pith_short_12","alias_value":"CPA6IXZMLWGJ","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"CPA6IXZMLWGJXSUY","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"CPA6IXZM","created_at":"2026-05-18T12:29:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:CPA6IXZMLWGJXSUY3XQ4SRG7DR","target":"record","payload":{"canonical_record":{"source":{"id":"1509.03504","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2015-07-22T00:09:31Z","cross_cats_sorted":["physics.flu-dyn","q-bio.QM"],"title_canon_sha256":"c1bbb4c9010b736d886241e0341031acb2430e6b8f6c830c5191503d7b786aca","abstract_canon_sha256":"a714f62a128c8defcc0b2cf828cf5c3769fc3e2c295965c0b0c70d746d860e66"},"schema_version":"1.0"},"canonical_sha256":"13c1e45f2c5d8c9bca98dde1c944df1c7f515892121638a2e927fa7190015695","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:33:23.026085Z","signature_b64":"ENc2HOEH6WkF+YJGNBxzDJEYiFywiC/5Du61nuFhO6IQ9oxDWcVGY/MrdS1y2+qCgXA4qo3sMVJXCkqgkBQqCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"13c1e45f2c5d8c9bca98dde1c944df1c7f515892121638a2e927fa7190015695","last_reissued_at":"2026-05-18T01:33:23.025501Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:33:23.025501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1509.03504","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":"2026-05-18T01:33:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aMFfla/TCnQqea7eKkiwwAZqr/UJATXp9UQqLFOPO5Sdj0BMwUJzkpAV1mVnAR8Ck6/3I3PGJiIxlX2dvrpRCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:07:10.466852Z"},"content_sha256":"307ae83ed7bfebd731693ded4f152edf1e9061b526e55063906dcbf851226772","schema_version":"1.0","event_id":"sha256:307ae83ed7bfebd731693ded4f152edf1e9061b526e55063906dcbf851226772"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:CPA6IXZMLWGJXSUY3XQ4SRG7DR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Computational Analysis of Amoeboid Swimming at Low Reynolds Number","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["physics.flu-dyn","q-bio.QM"],"primary_cat":"q-bio.CB","authors_text":"Hans G. Othmer, Qixuan Wang","submitted_at":"2015-07-22T00:09:31Z","abstract_excerpt":"Recent experimental work has shown that eukaryotic cells can swim in a fluid as well as crawl on a substrate. We investigate the swimming behavior of Dictyostelium discoideum amoebae who swim by initiating traveling protrusions at the front that propagate rearward. In our model we prescribe the velocity at the surface of the swimming cell, and use techniques of complex analysis to develop 2D models that enable us to study the fluid-cell interaction. Shapes that approximate the protrusions used by Dictyostelium discoideum can be generated via the Schwarz-Christoffel transformation, and the boun"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.03504","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":"2026-05-18T01:33:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0eWOKk5pGOL6vzkQKz/fJHice7QRDY/cIycE2ETg9GvYv9q+UFkmbsjh+YIfp2dXEcDHYFM81aSe2DoITlTACA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:07:10.467202Z"},"content_sha256":"32396bf00ebf7b0cbafb26808806c1ea38f82bb4a58ce6289c7408dccd3e5268","schema_version":"1.0","event_id":"sha256:32396bf00ebf7b0cbafb26808806c1ea38f82bb4a58ce6289c7408dccd3e5268"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/bundle.json","state_url":"https://pith.science/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/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":"2026-05-28T03:07:10Z","links":{"resolver":"https://pith.science/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR","bundle":"https://pith.science/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/bundle.json","state":"https://pith.science/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CPA6IXZMLWGJXSUY3XQ4SRG7DR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:CPA6IXZMLWGJXSUY3XQ4SRG7DR","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":"a714f62a128c8defcc0b2cf828cf5c3769fc3e2c295965c0b0c70d746d860e66","cross_cats_sorted":["physics.flu-dyn","q-bio.QM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2015-07-22T00:09:31Z","title_canon_sha256":"c1bbb4c9010b736d886241e0341031acb2430e6b8f6c830c5191503d7b786aca"},"schema_version":"1.0","source":{"id":"1509.03504","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1509.03504","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"arxiv_version","alias_value":"1509.03504v1","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1509.03504","created_at":"2026-05-18T01:33:23Z"},{"alias_kind":"pith_short_12","alias_value":"CPA6IXZMLWGJ","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"CPA6IXZMLWGJXSUY","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"CPA6IXZM","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:32396bf00ebf7b0cbafb26808806c1ea38f82bb4a58ce6289c7408dccd3e5268","target":"graph","created_at":"2026-05-18T01:33:23Z","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":"Recent experimental work has shown that eukaryotic cells can swim in a fluid as well as crawl on a substrate. We investigate the swimming behavior of Dictyostelium discoideum amoebae who swim by initiating traveling protrusions at the front that propagate rearward. In our model we prescribe the velocity at the surface of the swimming cell, and use techniques of complex analysis to develop 2D models that enable us to study the fluid-cell interaction. Shapes that approximate the protrusions used by Dictyostelium discoideum can be generated via the Schwarz-Christoffel transformation, and the boun","authors_text":"Hans G. Othmer, Qixuan Wang","cross_cats":["physics.flu-dyn","q-bio.QM"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2015-07-22T00:09:31Z","title":"Computational Analysis of Amoeboid Swimming at Low Reynolds Number"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1509.03504","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":"sha256:307ae83ed7bfebd731693ded4f152edf1e9061b526e55063906dcbf851226772","target":"record","created_at":"2026-05-18T01:33:23Z","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":"a714f62a128c8defcc0b2cf828cf5c3769fc3e2c295965c0b0c70d746d860e66","cross_cats_sorted":["physics.flu-dyn","q-bio.QM"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"q-bio.CB","submitted_at":"2015-07-22T00:09:31Z","title_canon_sha256":"c1bbb4c9010b736d886241e0341031acb2430e6b8f6c830c5191503d7b786aca"},"schema_version":"1.0","source":{"id":"1509.03504","kind":"arxiv","version":1}},"canonical_sha256":"13c1e45f2c5d8c9bca98dde1c944df1c7f515892121638a2e927fa7190015695","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"13c1e45f2c5d8c9bca98dde1c944df1c7f515892121638a2e927fa7190015695","first_computed_at":"2026-05-18T01:33:23.025501Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:33:23.025501Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ENc2HOEH6WkF+YJGNBxzDJEYiFywiC/5Du61nuFhO6IQ9oxDWcVGY/MrdS1y2+qCgXA4qo3sMVJXCkqgkBQqCw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:33:23.026085Z","signed_message":"canonical_sha256_bytes"},"source_id":"1509.03504","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:307ae83ed7bfebd731693ded4f152edf1e9061b526e55063906dcbf851226772","sha256:32396bf00ebf7b0cbafb26808806c1ea38f82bb4a58ce6289c7408dccd3e5268"],"state_sha256":"edfa491c346c0269e50f248f08d4d63fa454daa82a73680991ee540378e4ee2b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"58nFzYe9h8Qm5jS6WEf6BmhlotaH8ZrKpa6byZFRvQiW/o+aSeax+qQod3vXbajSqy4WSriPonY0XI9Ca+pJCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T03:07:10.469156Z","bundle_sha256":"8bc8b20cff27c7efac9f0d7d30096697ad3ce791f8613eec97628e91b5794a2d"}}