{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:5S2W7MB3UBKGPITBPA3DICMZCX","short_pith_number":"pith:5S2W7MB3","canonical_record":{"source":{"id":"2605.25337","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-05-25T01:42:40Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"ba11a6d4b52f05b1b8cd86f20bcf561e95cf1778b11d55b96c72907f5cdbeae6","abstract_canon_sha256":"98db30ae28679dd417a99febffffec08dc049089f8251cdb04ab1e7bd2b9493d"},"schema_version":"1.0"},"canonical_sha256":"ecb56fb03ba05467a261783634099915eca24850de5815967eaf2720ceda17f3","source":{"kind":"arxiv","id":"2605.25337","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.25337","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"arxiv_version","alias_value":"2605.25337v1","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.25337","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_12","alias_value":"5S2W7MB3UBKG","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_16","alias_value":"5S2W7MB3UBKGPITB","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_8","alias_value":"5S2W7MB3","created_at":"2026-05-26T02:04:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:5S2W7MB3UBKGPITBPA3DICMZCX","target":"record","payload":{"canonical_record":{"source":{"id":"2605.25337","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-05-25T01:42:40Z","cross_cats_sorted":["cond-mat.soft"],"title_canon_sha256":"ba11a6d4b52f05b1b8cd86f20bcf561e95cf1778b11d55b96c72907f5cdbeae6","abstract_canon_sha256":"98db30ae28679dd417a99febffffec08dc049089f8251cdb04ab1e7bd2b9493d"},"schema_version":"1.0"},"canonical_sha256":"ecb56fb03ba05467a261783634099915eca24850de5815967eaf2720ceda17f3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-26T02:04:29.500865Z","signature_b64":"RdegBlaZmpuQO+4CgcR7+ezTU/9Ued3ldAuIjs5bWCAM8GoUCDjxGIe9+A7/+a09+FY+BSaw1WHKWDdgmTO5BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ecb56fb03ba05467a261783634099915eca24850de5815967eaf2720ceda17f3","last_reissued_at":"2026-05-26T02:04:29.500269Z","signature_status":"signed_v1","first_computed_at":"2026-05-26T02:04:29.500269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.25337","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":"2026-05-26T02:04:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TO7ljoxrNHSs0HZmsnnqH9wNO63g+B8IyKmLuxw3QoBnrvSTa9ghKRlVYq6ppQRPeoooI8nqRlmREj/dF8ydAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T18:38:38.886054Z"},"content_sha256":"40b6e1c55743305a2768ec3c56ed4bdfbc84a7c751ee9f6aa1db5e9a8f79b921","schema_version":"1.0","event_id":"sha256:40b6e1c55743305a2768ec3c56ed4bdfbc84a7c751ee9f6aa1db5e9a8f79b921"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:5S2W7MB3UBKGPITBPA3DICMZCX","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hydrodynamics constrain choanoflagellate collar geometry","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cond-mat.soft"],"primary_cat":"physics.bio-ph","authors_text":"Catherine Penington, Christian Thomas, Lyndon Koens, Tasawar Iqbal","submitted_at":"2026-05-25T01:42:40Z","abstract_excerpt":"As the closest living relatives of animals, choanoflagellates exhibit remarkable diversity. Even their microvilli collar, used to filter and capture food, varies significantly among species. This diversity suggests either strong environmental adaptation or an insensitivity to the collar geometry. Previous hydrodynamic studies have suggested that the pressure change across the collar is similar across species. In this study, we show that hydrodynamics imposes additional geometric constraints on the choanoflagellate collar. We create a simplified, reduced-order model that neglects finite collar "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.25337","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/2605.25337/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":"2026-05-26T02:04:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"o+tCKLqL/qvKWqteEgubxJ6CZ5KFa/d2DdxDkTv3kVTdVWtSHgTQFn2IVOzXRiA1UnQwbXgLVUeExTDyytOMCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-24T18:38:38.886442Z"},"content_sha256":"6f4f079571d379bd07fb01211202c2e587bd5852842beaedfb5c354222ecc8ec","schema_version":"1.0","event_id":"sha256:6f4f079571d379bd07fb01211202c2e587bd5852842beaedfb5c354222ecc8ec"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5S2W7MB3UBKGPITBPA3DICMZCX/bundle.json","state_url":"https://pith.science/pith/5S2W7MB3UBKGPITBPA3DICMZCX/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5S2W7MB3UBKGPITBPA3DICMZCX/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":"2026-06-24T18:38:38Z","links":{"resolver":"https://pith.science/pith/5S2W7MB3UBKGPITBPA3DICMZCX","bundle":"https://pith.science/pith/5S2W7MB3UBKGPITBPA3DICMZCX/bundle.json","state":"https://pith.science/pith/5S2W7MB3UBKGPITBPA3DICMZCX/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5S2W7MB3UBKGPITBPA3DICMZCX/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:5S2W7MB3UBKGPITBPA3DICMZCX","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":"98db30ae28679dd417a99febffffec08dc049089f8251cdb04ab1e7bd2b9493d","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-05-25T01:42:40Z","title_canon_sha256":"ba11a6d4b52f05b1b8cd86f20bcf561e95cf1778b11d55b96c72907f5cdbeae6"},"schema_version":"1.0","source":{"id":"2605.25337","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.25337","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"arxiv_version","alias_value":"2605.25337v1","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.25337","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_12","alias_value":"5S2W7MB3UBKG","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_16","alias_value":"5S2W7MB3UBKGPITB","created_at":"2026-05-26T02:04:29Z"},{"alias_kind":"pith_short_8","alias_value":"5S2W7MB3","created_at":"2026-05-26T02:04:29Z"}],"graph_snapshots":[{"event_id":"sha256:6f4f079571d379bd07fb01211202c2e587bd5852842beaedfb5c354222ecc8ec","target":"graph","created_at":"2026-05-26T02:04:29Z","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/2605.25337/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"As the closest living relatives of animals, choanoflagellates exhibit remarkable diversity. Even their microvilli collar, used to filter and capture food, varies significantly among species. This diversity suggests either strong environmental adaptation or an insensitivity to the collar geometry. Previous hydrodynamic studies have suggested that the pressure change across the collar is similar across species. In this study, we show that hydrodynamics imposes additional geometric constraints on the choanoflagellate collar. We create a simplified, reduced-order model that neglects finite collar ","authors_text":"Catherine Penington, Christian Thomas, Lyndon Koens, Tasawar Iqbal","cross_cats":["cond-mat.soft"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-05-25T01:42:40Z","title":"Hydrodynamics constrain choanoflagellate collar geometry"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.25337","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":"sha256:40b6e1c55743305a2768ec3c56ed4bdfbc84a7c751ee9f6aa1db5e9a8f79b921","target":"record","created_at":"2026-05-26T02:04:29Z","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":"98db30ae28679dd417a99febffffec08dc049089f8251cdb04ab1e7bd2b9493d","cross_cats_sorted":["cond-mat.soft"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"physics.bio-ph","submitted_at":"2026-05-25T01:42:40Z","title_canon_sha256":"ba11a6d4b52f05b1b8cd86f20bcf561e95cf1778b11d55b96c72907f5cdbeae6"},"schema_version":"1.0","source":{"id":"2605.25337","kind":"arxiv","version":1}},"canonical_sha256":"ecb56fb03ba05467a261783634099915eca24850de5815967eaf2720ceda17f3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ecb56fb03ba05467a261783634099915eca24850de5815967eaf2720ceda17f3","first_computed_at":"2026-05-26T02:04:29.500269Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-26T02:04:29.500269Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RdegBlaZmpuQO+4CgcR7+ezTU/9Ued3ldAuIjs5bWCAM8GoUCDjxGIe9+A7/+a09+FY+BSaw1WHKWDdgmTO5BQ==","signature_status":"signed_v1","signed_at":"2026-05-26T02:04:29.500865Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.25337","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:40b6e1c55743305a2768ec3c56ed4bdfbc84a7c751ee9f6aa1db5e9a8f79b921","sha256:6f4f079571d379bd07fb01211202c2e587bd5852842beaedfb5c354222ecc8ec"],"state_sha256":"66e069fc687a22732b7ac1d2ecdb3d1a5a382df9c58c4ba8ff7c31bcdf5f32bb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mWvcTTMAQNw4JAzXDES7MUStetlJ+ve1GQICDFAcUW0TqhqPK7HNcZIPK7qlOCYbBtqZY9waUkaKJ8OVzocfAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-24T18:38:38.888431Z","bundle_sha256":"4ef42e5c430cef616fff9a016bbcf106165afbe04d4a4684c7b898b7dd45051e"}}