{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2008:2T4CM6CARCLJSNVOY4NX2VYGUA","short_pith_number":"pith:2T4CM6CA","canonical_record":{"source":{"id":"0812.2487","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2008-12-12T21:34:41Z","cross_cats_sorted":[],"title_canon_sha256":"3dea2b4a0794a61f61d14d1beff4912212afedd8bf733612a14b6f9c49210dd0","abstract_canon_sha256":"d524a3f3863b946ee5c016e2cec25b8e5dd27902f1c0e36a81acd0c80738f691"},"schema_version":"1.0"},"canonical_sha256":"d4f826784088969936aec71b7d5706a005ff95a61776ce47d8c1ae13ee9d5ac7","source":{"kind":"arxiv","id":"0812.2487","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.2487","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"arxiv_version","alias_value":"0812.2487v1","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.2487","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"pith_short_12","alias_value":"2T4CM6CARCLJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"2T4CM6CARCLJSNVO","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"2T4CM6CA","created_at":"2026-05-18T12:25:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2008:2T4CM6CARCLJSNVOY4NX2VYGUA","target":"record","payload":{"canonical_record":{"source":{"id":"0812.2487","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2008-12-12T21:34:41Z","cross_cats_sorted":[],"title_canon_sha256":"3dea2b4a0794a61f61d14d1beff4912212afedd8bf733612a14b6f9c49210dd0","abstract_canon_sha256":"d524a3f3863b946ee5c016e2cec25b8e5dd27902f1c0e36a81acd0c80738f691"},"schema_version":"1.0"},"canonical_sha256":"d4f826784088969936aec71b7d5706a005ff95a61776ce47d8c1ae13ee9d5ac7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:15:10.523982Z","signature_b64":"ZD+1Kw4gJT8zikYkhwraYypPcYQu1vGpGKtyyhLoZxIIVv16I9OsE7qw7kuK5WDlQLRDeLDe1Wyly7J/NnlpCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d4f826784088969936aec71b7d5706a005ff95a61776ce47d8c1ae13ee9d5ac7","last_reissued_at":"2026-05-18T02:15:10.523216Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:15:10.523216Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0812.2487","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":"2026-05-18T02:15:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Tigd3LXHtpGI+vx9wCmWzl52zXRm0yAaTGkiYOOWA2D6IT7TwjtWFCiuI542r4sKUHJ4wqlsvtjaf9h7emMNAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T11:09:34.284208Z"},"content_sha256":"3db8711dc8148865698d443cc0414038ddf3afdd6507094bd18716f5929fd38e","schema_version":"1.0","event_id":"sha256:3db8711dc8148865698d443cc0414038ddf3afdd6507094bd18716f5929fd38e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2008:2T4CM6CARCLJSNVOY4NX2VYGUA","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Hydrodynamic orienting of asymmetric microobjects under gravity","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cond-mat.soft","authors_text":"Eligiusz Wajnryb, Maria L. Ekiel-Jezewska","submitted_at":"2008-12-12T21:34:41Z","abstract_excerpt":"It is shown that nonsymmetric microobjects orient while settling under gravity in a viscous fluid. To analyze this process, a simple shape is chosen: a non-deformable `chain'. The chain consists of two straight arms, made of touching solid spheres. In the absence of external torques, the spheres are free to spin along the arms. The motion of the chain is evaluated by solving the Stokes equations with the use of the multipole method. It is demonstrated that the spinning beads speed up sedimentation by a small amount, and increase the orientation rate significantly in comparison to the correspon"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.2487","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":"2026-05-18T02:15:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F4Ee4zT/4n8vRvUFq+ekHBIbIjjXDi7NyD3ZeBRk3OLY1n7e1oWyW9JAxIPDbrfRTGrwNFOyoKynTTQLfC7SCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-26T11:09:34.284568Z"},"content_sha256":"e9043e039c3bcdf5fafa29979b609e3ebbd876df0ce732f9f71e10ccbb4755ea","schema_version":"1.0","event_id":"sha256:e9043e039c3bcdf5fafa29979b609e3ebbd876df0ce732f9f71e10ccbb4755ea"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/bundle.json","state_url":"https://pith.science/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/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":"2026-06-26T11:09:34Z","links":{"resolver":"https://pith.science/pith/2T4CM6CARCLJSNVOY4NX2VYGUA","bundle":"https://pith.science/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/bundle.json","state":"https://pith.science/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2T4CM6CARCLJSNVOY4NX2VYGUA/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2008:2T4CM6CARCLJSNVOY4NX2VYGUA","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":"d524a3f3863b946ee5c016e2cec25b8e5dd27902f1c0e36a81acd0c80738f691","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2008-12-12T21:34:41Z","title_canon_sha256":"3dea2b4a0794a61f61d14d1beff4912212afedd8bf733612a14b6f9c49210dd0"},"schema_version":"1.0","source":{"id":"0812.2487","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0812.2487","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"arxiv_version","alias_value":"0812.2487v1","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0812.2487","created_at":"2026-05-18T02:15:10Z"},{"alias_kind":"pith_short_12","alias_value":"2T4CM6CARCLJ","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_16","alias_value":"2T4CM6CARCLJSNVO","created_at":"2026-05-18T12:25:56Z"},{"alias_kind":"pith_short_8","alias_value":"2T4CM6CA","created_at":"2026-05-18T12:25:56Z"}],"graph_snapshots":[{"event_id":"sha256:e9043e039c3bcdf5fafa29979b609e3ebbd876df0ce732f9f71e10ccbb4755ea","target":"graph","created_at":"2026-05-18T02:15:10Z","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":"It is shown that nonsymmetric microobjects orient while settling under gravity in a viscous fluid. To analyze this process, a simple shape is chosen: a non-deformable `chain'. The chain consists of two straight arms, made of touching solid spheres. In the absence of external torques, the spheres are free to spin along the arms. The motion of the chain is evaluated by solving the Stokes equations with the use of the multipole method. It is demonstrated that the spinning beads speed up sedimentation by a small amount, and increase the orientation rate significantly in comparison to the correspon","authors_text":"Eligiusz Wajnryb, Maria L. Ekiel-Jezewska","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2008-12-12T21:34:41Z","title":"Hydrodynamic orienting of asymmetric microobjects under gravity"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0812.2487","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":"sha256:3db8711dc8148865698d443cc0414038ddf3afdd6507094bd18716f5929fd38e","target":"record","created_at":"2026-05-18T02:15:10Z","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":"d524a3f3863b946ee5c016e2cec25b8e5dd27902f1c0e36a81acd0c80738f691","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cond-mat.soft","submitted_at":"2008-12-12T21:34:41Z","title_canon_sha256":"3dea2b4a0794a61f61d14d1beff4912212afedd8bf733612a14b6f9c49210dd0"},"schema_version":"1.0","source":{"id":"0812.2487","kind":"arxiv","version":1}},"canonical_sha256":"d4f826784088969936aec71b7d5706a005ff95a61776ce47d8c1ae13ee9d5ac7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d4f826784088969936aec71b7d5706a005ff95a61776ce47d8c1ae13ee9d5ac7","first_computed_at":"2026-05-18T02:15:10.523216Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:15:10.523216Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ZD+1Kw4gJT8zikYkhwraYypPcYQu1vGpGKtyyhLoZxIIVv16I9OsE7qw7kuK5WDlQLRDeLDe1Wyly7J/NnlpCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:15:10.523982Z","signed_message":"canonical_sha256_bytes"},"source_id":"0812.2487","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3db8711dc8148865698d443cc0414038ddf3afdd6507094bd18716f5929fd38e","sha256:e9043e039c3bcdf5fafa29979b609e3ebbd876df0ce732f9f71e10ccbb4755ea"],"state_sha256":"76ee3272daf40f2dad2fd3f8df236c4734b2203ede5f38c1e0aa63e5999d24cc"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vusYgGcgrq/pfAcBJfUsd4kAavnl8DupVgLd3kQ5BcVdGbN77gIBpQebXDi1s6VSN3VKbN7hkhP0KJLTnTNODw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-26T11:09:34.286546Z","bundle_sha256":"1069af3a385ccaf3f3161b3546297694494c4f39ca6573e0be748e77956f2614"}}