{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:EAOCNNSAAA4QPMHGPNMIDA7CMP","short_pith_number":"pith:EAOCNNSA","canonical_record":{"source":{"id":"1609.07388","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2016-09-23T14:49:07Z","cross_cats_sorted":["gr-qc","math.MP"],"title_canon_sha256":"442cf5d2cf771d71154cb1ddafd171a92441064e057370200829bd7b13e6353e","abstract_canon_sha256":"e68b0e3948c6ab9762365d7b2d5c54ab5452ed717df35963c52b1ce2b1b22593"},"schema_version":"1.0"},"canonical_sha256":"201c26b640003907b0e67b588183e263e13c957717966225c4442209a864e977","source":{"kind":"arxiv","id":"1609.07388","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07388","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07388v1","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07388","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"pith_short_12","alias_value":"EAOCNNSAAA4Q","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"EAOCNNSAAA4QPMHG","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"EAOCNNSA","created_at":"2026-05-18T12:30:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:EAOCNNSAAA4QPMHGPNMIDA7CMP","target":"record","payload":{"canonical_record":{"source":{"id":"1609.07388","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2016-09-23T14:49:07Z","cross_cats_sorted":["gr-qc","math.MP"],"title_canon_sha256":"442cf5d2cf771d71154cb1ddafd171a92441064e057370200829bd7b13e6353e","abstract_canon_sha256":"e68b0e3948c6ab9762365d7b2d5c54ab5452ed717df35963c52b1ce2b1b22593"},"schema_version":"1.0"},"canonical_sha256":"201c26b640003907b0e67b588183e263e13c957717966225c4442209a864e977","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:18:05.453267Z","signature_b64":"WM4P47fPTf7wStWs1LSQcLbkr8oy5+6KvpGt400KLE7eWt+x1+q578Ewk4oUSKyCXfJt/h9ZFF6w5ALQYn1aCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"201c26b640003907b0e67b588183e263e13c957717966225c4442209a864e977","last_reissued_at":"2026-05-18T00:18:05.452737Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:18:05.452737Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1609.07388","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":"2026-05-18T00:18:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JDKSTkBXigVBPH2KTc2fvd4tVxGAkO2utVwgIYnaWuqVPb1jq/GZslwknnN1XiLODiqBa/JVvrXqNwbrxdFBCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T14:22:11.054215Z"},"content_sha256":"ab449eddc9991f27534d286d2a30eb043956dad7ab70a522cdc075806c342fc1","schema_version":"1.0","event_id":"sha256:ab449eddc9991f27534d286d2a30eb043956dad7ab70a522cdc075806c342fc1"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:EAOCNNSAAA4QPMHGPNMIDA7CMP","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A new geometrical look at Ostrogradsky procedure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["gr-qc","math.MP"],"primary_cat":"math-ph","authors_text":"Enrico Massa, Roberto Cianci, Sante Carloni, Stefano Vignolo","submitted_at":"2016-09-23T14:49:07Z","abstract_excerpt":"Making use of the modern techniques of non-holonomic geometry and constrained variational calculus, a revisitation of Ostrogradsky's Hamiltonian formulation of the evolution equations determined by a Lagrangian of order >= 2 in the derivatives of the configuration variables is presented."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07388","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":"2026-05-18T00:18:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0w+ZW5d3CllGonYiBpGBO9Szd5s2CKsLaazRaEnL79GXACm9jJ9KzJeZnDlvT91f/qs6x/bvnbcxqg6a0nntDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T14:22:11.054893Z"},"content_sha256":"40478133b5363d8cd821060c4369364a5249d8c98d970d7dcb93a4b239cc7d77","schema_version":"1.0","event_id":"sha256:40478133b5363d8cd821060c4369364a5249d8c98d970d7dcb93a4b239cc7d77"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/bundle.json","state_url":"https://pith.science/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/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":"2026-05-25T14:22:11Z","links":{"resolver":"https://pith.science/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP","bundle":"https://pith.science/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/bundle.json","state":"https://pith.science/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EAOCNNSAAA4QPMHGPNMIDA7CMP/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:EAOCNNSAAA4QPMHGPNMIDA7CMP","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":"e68b0e3948c6ab9762365d7b2d5c54ab5452ed717df35963c52b1ce2b1b22593","cross_cats_sorted":["gr-qc","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2016-09-23T14:49:07Z","title_canon_sha256":"442cf5d2cf771d71154cb1ddafd171a92441064e057370200829bd7b13e6353e"},"schema_version":"1.0","source":{"id":"1609.07388","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1609.07388","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"arxiv_version","alias_value":"1609.07388v1","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1609.07388","created_at":"2026-05-18T00:18:05Z"},{"alias_kind":"pith_short_12","alias_value":"EAOCNNSAAA4Q","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_16","alias_value":"EAOCNNSAAA4QPMHG","created_at":"2026-05-18T12:30:12Z"},{"alias_kind":"pith_short_8","alias_value":"EAOCNNSA","created_at":"2026-05-18T12:30:12Z"}],"graph_snapshots":[{"event_id":"sha256:40478133b5363d8cd821060c4369364a5249d8c98d970d7dcb93a4b239cc7d77","target":"graph","created_at":"2026-05-18T00:18:05Z","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":"Making use of the modern techniques of non-holonomic geometry and constrained variational calculus, a revisitation of Ostrogradsky's Hamiltonian formulation of the evolution equations determined by a Lagrangian of order >= 2 in the derivatives of the configuration variables is presented.","authors_text":"Enrico Massa, Roberto Cianci, Sante Carloni, Stefano Vignolo","cross_cats":["gr-qc","math.MP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2016-09-23T14:49:07Z","title":"A new geometrical look at Ostrogradsky procedure"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1609.07388","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:ab449eddc9991f27534d286d2a30eb043956dad7ab70a522cdc075806c342fc1","target":"record","created_at":"2026-05-18T00:18:05Z","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":"e68b0e3948c6ab9762365d7b2d5c54ab5452ed717df35963c52b1ce2b1b22593","cross_cats_sorted":["gr-qc","math.MP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math-ph","submitted_at":"2016-09-23T14:49:07Z","title_canon_sha256":"442cf5d2cf771d71154cb1ddafd171a92441064e057370200829bd7b13e6353e"},"schema_version":"1.0","source":{"id":"1609.07388","kind":"arxiv","version":1}},"canonical_sha256":"201c26b640003907b0e67b588183e263e13c957717966225c4442209a864e977","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"201c26b640003907b0e67b588183e263e13c957717966225c4442209a864e977","first_computed_at":"2026-05-18T00:18:05.452737Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:18:05.452737Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"WM4P47fPTf7wStWs1LSQcLbkr8oy5+6KvpGt400KLE7eWt+x1+q578Ewk4oUSKyCXfJt/h9ZFF6w5ALQYn1aCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:18:05.453267Z","signed_message":"canonical_sha256_bytes"},"source_id":"1609.07388","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ab449eddc9991f27534d286d2a30eb043956dad7ab70a522cdc075806c342fc1","sha256:40478133b5363d8cd821060c4369364a5249d8c98d970d7dcb93a4b239cc7d77"],"state_sha256":"b3857a6f5c34e2f3b74cebefd41e8006c4a2f989722c2a523ad18325268fb408"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oFhcJRyxzZLoQAU2S8CeoMfv2eoFiQCfqJDdqSDGqEmNGXJnSys9peJPjAmA9fpi+rr8uMJHymB/e3NYWUDQBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T14:22:11.058353Z","bundle_sha256":"a024b17097a92c1daabeabfa892572aac9bb745a95ec2acd766ef0c8f529a110"}}