{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:GG3IIZ3XYHHM25DHHGEPHSQODD","short_pith_number":"pith:GG3IIZ3X","canonical_record":{"source":{"id":"1204.4366","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2012-04-19T15:02:30Z","cross_cats_sorted":[],"title_canon_sha256":"4b6d0ab7292d202f303fc4b182c0232e2bfcaddbf4171792300af6b78962d4d0","abstract_canon_sha256":"9f020d0924e0ff85798032f61bd5b54a98a1128f75f4e6977c2126b8ff4cc757"},"schema_version":"1.0"},"canonical_sha256":"31b6846777c1cecd74673988f3ca0e18fafd9a30c7d601ce4cd881f0fb27cd96","source":{"kind":"arxiv","id":"1204.4366","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.4366","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"arxiv_version","alias_value":"1204.4366v1","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.4366","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"pith_short_12","alias_value":"GG3IIZ3XYHHM","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GG3IIZ3XYHHM25DH","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GG3IIZ3X","created_at":"2026-05-18T12:27:06Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:GG3IIZ3XYHHM25DHHGEPHSQODD","target":"record","payload":{"canonical_record":{"source":{"id":"1204.4366","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2012-04-19T15:02:30Z","cross_cats_sorted":[],"title_canon_sha256":"4b6d0ab7292d202f303fc4b182c0232e2bfcaddbf4171792300af6b78962d4d0","abstract_canon_sha256":"9f020d0924e0ff85798032f61bd5b54a98a1128f75f4e6977c2126b8ff4cc757"},"schema_version":"1.0"},"canonical_sha256":"31b6846777c1cecd74673988f3ca0e18fafd9a30c7d601ce4cd881f0fb27cd96","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:57:27.673673Z","signature_b64":"3KQqDC+4ay2+2385Xuh6G8TCsAcqkAr7w3+C0+5CNDrmEdAch9mgJCNjEVJn71F/icO5lUu/dgB2rPfklO+jAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"31b6846777c1cecd74673988f3ca0e18fafd9a30c7d601ce4cd881f0fb27cd96","last_reissued_at":"2026-05-18T03:57:27.673022Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:57:27.673022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1204.4366","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":"2026-05-18T03:57:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HY2hNGXdKdDx1LAZ8s59NDTMngQuAi9SXUPCbLJm2tvLgpYJCqDE1taOy/vR1Stp3I0XMdmxvUTsJk6KWOc/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T12:09:23.227278Z"},"content_sha256":"7427a7085946d7144e8435d465fab0aa33806cbf64c5caed0fb4e7e8f167ff4b","schema_version":"1.0","event_id":"sha256:7427a7085946d7144e8435d465fab0aa33806cbf64c5caed0fb4e7e8f167ff4b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:GG3IIZ3XYHHM25DHHGEPHSQODD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Multipath-dominant, pulsed doppler analysis of rotating blades","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CE","authors_text":"Michael Robinson","submitted_at":"2012-04-19T15:02:30Z","abstract_excerpt":"We present a novel angular fingerprinting algorithm for detecting changes in the direction of rotation of a target with a monostatic, stationary sonar platform. Unlike other approaches, we assume that the target's centroid is stationary, and exploit doppler multipath signals to resolve the otherwise unavoidable ambiguities that arise. Since the algorithm is based on an underlying differential topological theory, it is highly robust to distortions in the collected data. We demonstrate performance of this algorithm experimentally, by exhibiting a pulsed doppler sonar collection system that runs "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.4366","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":"2026-05-18T03:57:27Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VrkSWnD8YAW/RNq1GifuV/t9yX2qtRZBMvmDlPc7TW0Mt3Oig0va0PjosiYnog/MutE8e05w3tX0b4a2Fu32Cg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T12:09:23.227631Z"},"content_sha256":"4e69be5df3e71b277db6b75e65543498d1d779d0ea1294fe15010076ea72baf2","schema_version":"1.0","event_id":"sha256:4e69be5df3e71b277db6b75e65543498d1d779d0ea1294fe15010076ea72baf2"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/bundle.json","state_url":"https://pith.science/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/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":"2026-06-05T12:09:23Z","links":{"resolver":"https://pith.science/pith/GG3IIZ3XYHHM25DHHGEPHSQODD","bundle":"https://pith.science/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/bundle.json","state":"https://pith.science/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GG3IIZ3XYHHM25DHHGEPHSQODD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:GG3IIZ3XYHHM25DHHGEPHSQODD","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":"9f020d0924e0ff85798032f61bd5b54a98a1128f75f4e6977c2126b8ff4cc757","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2012-04-19T15:02:30Z","title_canon_sha256":"4b6d0ab7292d202f303fc4b182c0232e2bfcaddbf4171792300af6b78962d4d0"},"schema_version":"1.0","source":{"id":"1204.4366","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1204.4366","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"arxiv_version","alias_value":"1204.4366v1","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1204.4366","created_at":"2026-05-18T03:57:27Z"},{"alias_kind":"pith_short_12","alias_value":"GG3IIZ3XYHHM","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_16","alias_value":"GG3IIZ3XYHHM25DH","created_at":"2026-05-18T12:27:06Z"},{"alias_kind":"pith_short_8","alias_value":"GG3IIZ3X","created_at":"2026-05-18T12:27:06Z"}],"graph_snapshots":[{"event_id":"sha256:4e69be5df3e71b277db6b75e65543498d1d779d0ea1294fe15010076ea72baf2","target":"graph","created_at":"2026-05-18T03:57:27Z","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":"We present a novel angular fingerprinting algorithm for detecting changes in the direction of rotation of a target with a monostatic, stationary sonar platform. Unlike other approaches, we assume that the target's centroid is stationary, and exploit doppler multipath signals to resolve the otherwise unavoidable ambiguities that arise. Since the algorithm is based on an underlying differential topological theory, it is highly robust to distortions in the collected data. We demonstrate performance of this algorithm experimentally, by exhibiting a pulsed doppler sonar collection system that runs ","authors_text":"Michael Robinson","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2012-04-19T15:02:30Z","title":"Multipath-dominant, pulsed doppler analysis of rotating blades"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1204.4366","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":"sha256:7427a7085946d7144e8435d465fab0aa33806cbf64c5caed0fb4e7e8f167ff4b","target":"record","created_at":"2026-05-18T03:57:27Z","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":"9f020d0924e0ff85798032f61bd5b54a98a1128f75f4e6977c2126b8ff4cc757","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CE","submitted_at":"2012-04-19T15:02:30Z","title_canon_sha256":"4b6d0ab7292d202f303fc4b182c0232e2bfcaddbf4171792300af6b78962d4d0"},"schema_version":"1.0","source":{"id":"1204.4366","kind":"arxiv","version":1}},"canonical_sha256":"31b6846777c1cecd74673988f3ca0e18fafd9a30c7d601ce4cd881f0fb27cd96","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"31b6846777c1cecd74673988f3ca0e18fafd9a30c7d601ce4cd881f0fb27cd96","first_computed_at":"2026-05-18T03:57:27.673022Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T03:57:27.673022Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3KQqDC+4ay2+2385Xuh6G8TCsAcqkAr7w3+C0+5CNDrmEdAch9mgJCNjEVJn71F/icO5lUu/dgB2rPfklO+jAw==","signature_status":"signed_v1","signed_at":"2026-05-18T03:57:27.673673Z","signed_message":"canonical_sha256_bytes"},"source_id":"1204.4366","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7427a7085946d7144e8435d465fab0aa33806cbf64c5caed0fb4e7e8f167ff4b","sha256:4e69be5df3e71b277db6b75e65543498d1d779d0ea1294fe15010076ea72baf2"],"state_sha256":"2bf85248342b7b3cb40050a959a23657b146d559a5f5fee598f8078b3cba8ada"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"TUsnxukG/abMwLW4oFi41Nb972+en4njKZ8uo8hm41P0KPpxvOZUzWFHMT0gdI3BM9kDslKIcU8fXyutvuZDDA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T12:09:23.229528Z","bundle_sha256":"09a7fd262b20ab7f211d46a00890f047ddba99e491c7aec26b20eb99f9b2a952"}}