{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:4MTMGDZ5BX6P74KYJLC6SESSI7","short_pith_number":"pith:4MTMGDZ5","canonical_record":{"source":{"id":"2102.03571","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2021-02-06T12:01:09Z","cross_cats_sorted":[],"title_canon_sha256":"ed0b4e79175bca5f662e9d21749d13dec75b099533c15ef92a0babc85b761a6c","abstract_canon_sha256":"0a51357ab1d7b90329bb3803f023845ae40871415443e411970f823b5dca346b"},"schema_version":"1.0"},"canonical_sha256":"e326c30f3d0dfcfff1584ac5e9125247e2f54073cbd7d3f033eab70323d7e4d4","source":{"kind":"arxiv","id":"2102.03571","version":3},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.03571","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"arxiv_version","alias_value":"2102.03571v3","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.03571","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_12","alias_value":"4MTMGDZ5BX6P","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_16","alias_value":"4MTMGDZ5BX6P74KY","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_8","alias_value":"4MTMGDZ5","created_at":"2026-07-05T06:35:41Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:4MTMGDZ5BX6P74KYJLC6SESSI7","target":"record","payload":{"canonical_record":{"source":{"id":"2102.03571","kind":"arxiv","version":3},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2021-02-06T12:01:09Z","cross_cats_sorted":[],"title_canon_sha256":"ed0b4e79175bca5f662e9d21749d13dec75b099533c15ef92a0babc85b761a6c","abstract_canon_sha256":"0a51357ab1d7b90329bb3803f023845ae40871415443e411970f823b5dca346b"},"schema_version":"1.0"},"canonical_sha256":"e326c30f3d0dfcfff1584ac5e9125247e2f54073cbd7d3f033eab70323d7e4d4","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T06:35:41.577508Z","signature_b64":"2BoLqS7miYeS1H14Py53U1Lb3ks/VhbJbfaA9jCEMHBcnL4Iif8+x/oLl8H2k+rdmdXrvnffQDf33LkJRi6UAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e326c30f3d0dfcfff1584ac5e9125247e2f54073cbd7d3f033eab70323d7e4d4","last_reissued_at":"2026-07-05T06:35:41.576894Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T06:35:41.576894Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.03571","source_version":3,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T06:35:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4quF6XrjTdqPBw2SNQvK+vWMH/ZU4SwyzCqHeeMYeU6fhcf5G6vcc09tXNYjt7YOL/bmqoCGv+hSTYQbCp/5Cw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T08:11:53.112070Z"},"content_sha256":"17dae6665f94584b8ef35f487fa3d0a73556018f381c4d35632b2f28a0153dcd","schema_version":"1.0","event_id":"sha256:17dae6665f94584b8ef35f487fa3d0a73556018f381c4d35632b2f28a0153dcd"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:4MTMGDZ5BX6P74KYJLC6SESSI7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two-dimensionally stable self-organization arises in simple schooling swimmers through hydrodynamic interactions","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"physics.flu-dyn","authors_text":"Amin Mivehchi, Keith W. Moored, Melike Kurt, Pedro Costa Ormonde","submitted_at":"2021-02-06T12:01:09Z","abstract_excerpt":"We present new constrained and free-swimming experiments and simulations of a pair of pitching hydrofoils interacting in a minimal school. The hydrofoils have an out-of-phase synchronization and they are varied through in-line, staggered, and side-by-side formations within the two-dimensional interaction plane. It is discovered that there is a \\textit{two-dimensionally} stable equilibrium point for a side-by-side formation. In fact, this formation is super-stable, meaning that hydrodynamic forces will passively maintain this formation even under external perturbations and the school as a whole"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.03571","kind":"arxiv","version":3},"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/2102.03571/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":"2026-07-05T06:35:41Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PSMCcCuJ9wokRDDNRhTaizuFNwrh0rDY6AE12FcunGHb6pYPo/60500yrUrVbrs/G+lnA+m+k76jxlVCNrJGCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-13T08:11:53.112616Z"},"content_sha256":"81475a6c96c8cade8caa51df880a0a1f816888c30789068fc5cb6304b464b0fc","schema_version":"1.0","event_id":"sha256:81475a6c96c8cade8caa51df880a0a1f816888c30789068fc5cb6304b464b0fc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/bundle.json","state_url":"https://pith.science/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/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":"2026-08-13T08:11:53Z","links":{"resolver":"https://pith.science/pith/4MTMGDZ5BX6P74KYJLC6SESSI7","bundle":"https://pith.science/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/bundle.json","state":"https://pith.science/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4MTMGDZ5BX6P74KYJLC6SESSI7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:4MTMGDZ5BX6P74KYJLC6SESSI7","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":"0a51357ab1d7b90329bb3803f023845ae40871415443e411970f823b5dca346b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2021-02-06T12:01:09Z","title_canon_sha256":"ed0b4e79175bca5f662e9d21749d13dec75b099533c15ef92a0babc85b761a6c"},"schema_version":"1.0","source":{"id":"2102.03571","kind":"arxiv","version":3}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.03571","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"arxiv_version","alias_value":"2102.03571v3","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.03571","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_12","alias_value":"4MTMGDZ5BX6P","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_16","alias_value":"4MTMGDZ5BX6P74KY","created_at":"2026-07-05T06:35:41Z"},{"alias_kind":"pith_short_8","alias_value":"4MTMGDZ5","created_at":"2026-07-05T06:35:41Z"}],"graph_snapshots":[{"event_id":"sha256:81475a6c96c8cade8caa51df880a0a1f816888c30789068fc5cb6304b464b0fc","target":"graph","created_at":"2026-07-05T06:35:41Z","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/2102.03571/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present new constrained and free-swimming experiments and simulations of a pair of pitching hydrofoils interacting in a minimal school. The hydrofoils have an out-of-phase synchronization and they are varied through in-line, staggered, and side-by-side formations within the two-dimensional interaction plane. It is discovered that there is a \\textit{two-dimensionally} stable equilibrium point for a side-by-side formation. In fact, this formation is super-stable, meaning that hydrodynamic forces will passively maintain this formation even under external perturbations and the school as a whole","authors_text":"Amin Mivehchi, Keith W. Moored, Melike Kurt, Pedro Costa Ormonde","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2021-02-06T12:01:09Z","title":"Two-dimensionally stable self-organization arises in simple schooling swimmers through hydrodynamic interactions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.03571","kind":"arxiv","version":3},"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":"sha256:17dae6665f94584b8ef35f487fa3d0a73556018f381c4d35632b2f28a0153dcd","target":"record","created_at":"2026-07-05T06:35:41Z","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":"0a51357ab1d7b90329bb3803f023845ae40871415443e411970f823b5dca346b","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"physics.flu-dyn","submitted_at":"2021-02-06T12:01:09Z","title_canon_sha256":"ed0b4e79175bca5f662e9d21749d13dec75b099533c15ef92a0babc85b761a6c"},"schema_version":"1.0","source":{"id":"2102.03571","kind":"arxiv","version":3}},"canonical_sha256":"e326c30f3d0dfcfff1584ac5e9125247e2f54073cbd7d3f033eab70323d7e4d4","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e326c30f3d0dfcfff1584ac5e9125247e2f54073cbd7d3f033eab70323d7e4d4","first_computed_at":"2026-07-05T06:35:41.576894Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T06:35:41.576894Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2BoLqS7miYeS1H14Py53U1Lb3ks/VhbJbfaA9jCEMHBcnL4Iif8+x/oLl8H2k+rdmdXrvnffQDf33LkJRi6UAA==","signature_status":"signed_v1","signed_at":"2026-07-05T06:35:41.577508Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.03571","source_kind":"arxiv","source_version":3}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:17dae6665f94584b8ef35f487fa3d0a73556018f381c4d35632b2f28a0153dcd","sha256:81475a6c96c8cade8caa51df880a0a1f816888c30789068fc5cb6304b464b0fc"],"state_sha256":"05e6b0bd83609d437d3c9837ec750f83f44ba3ef8adcf3fcdcfc3be5194aece9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3CMQVrY+l6V1WwG0cgQzuctJM2BTWv6MVd5cp7fUe/t/F7zQBhxyHI2yfXUkW+lgp9WPDjo1R3FdOQfbudwmCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-13T08:11:53.120456Z","bundle_sha256":"2f429b6fbc35eb12f3dfb642f4cbed120874d3b8f3d926dc9af16983526bf606"}}