{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:JIABTB63X3PMKZ7TD47WJFVZP2","short_pith_number":"pith:JIABTB63","canonical_record":{"source":{"id":"1907.05377","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2019-07-11T16:53:34Z","cross_cats_sorted":["cs.NA","math.OC","q-bio.BM","stat.AP"],"title_canon_sha256":"0142ffe73ff7c6f35881657a66bc07e411016b40597f0d2fd9d0a5a81f1979c5","abstract_canon_sha256":"7fd6e7cae5369c5809d0604ef4fd1b0164c0eff1c9ee37c28267b7f65ef89c95"},"schema_version":"1.0"},"canonical_sha256":"4a001987dbbedec567f31f3f6496b97eae967e5181d65048775ceb870ab48eb6","source":{"kind":"arxiv","id":"1907.05377","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05377","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05377v2","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05377","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_12","alias_value":"JIABTB63X3PM","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_16","alias_value":"JIABTB63X3PMKZ7T","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_8","alias_value":"JIABTB63","created_at":"2026-07-05T00:56:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:JIABTB63X3PMKZ7TD47WJFVZP2","target":"record","payload":{"canonical_record":{"source":{"id":"1907.05377","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2019-07-11T16:53:34Z","cross_cats_sorted":["cs.NA","math.OC","q-bio.BM","stat.AP"],"title_canon_sha256":"0142ffe73ff7c6f35881657a66bc07e411016b40597f0d2fd9d0a5a81f1979c5","abstract_canon_sha256":"7fd6e7cae5369c5809d0604ef4fd1b0164c0eff1c9ee37c28267b7f65ef89c95"},"schema_version":"1.0"},"canonical_sha256":"4a001987dbbedec567f31f3f6496b97eae967e5181d65048775ceb870ab48eb6","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:56:28.587747Z","signature_b64":"eDDjg3P63LQmvTBBLCpf8xRVX9OhjfE6qZQNxFx1fQS/tPH2jo0j27Zgr3dP4OUtT8cUcUsiP4DPRVtNoaRyAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4a001987dbbedec567f31f3f6496b97eae967e5181d65048775ceb870ab48eb6","last_reissued_at":"2026-07-05T00:56:28.587296Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:56:28.587296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1907.05377","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T00:56:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"8j3C9sqyeUKnZ+R/PTN+9UWQ0rQrB5CaFnBQBA6cbeixf14IW8XYJdUD+kSsa5Ymj6P5BQjiuUPdrQma1lqPCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T22:02:57.288919Z"},"content_sha256":"5f9d7b2a1f7fb4ff3f5f34f4c6779f4cce10ba7c548b230cb02f68caae06150b","schema_version":"1.0","event_id":"sha256:5f9d7b2a1f7fb4ff3f5f34f4c6779f4cce10ba7c548b230cb02f68caae06150b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:JIABTB63X3PMKZ7TD47WJFVZP2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Method of moments for 3-D single particle ab initio modeling with non-uniform distribution of viewing angles","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.NA","math.OC","q-bio.BM","stat.AP"],"primary_cat":"math.NA","authors_text":"Amit Singer, Boris Landa, Joe Kileel, Nir Sharon, YueHaw Khoo","submitted_at":"2019-07-11T16:53:34Z","abstract_excerpt":"Single-particle reconstruction in cryo-electron microscopy (cryo-EM) is an increasingly popular technique for determining the 3-D structure of a molecule from several noisy 2-D projections images taken at unknown viewing angles. Most reconstruction algorithms require a low-resolution initialization for the 3-D structure, which is the goal of ab initio modeling. Suggested by Zvi Kam in 1980, the method of moments (MoM) offers one approach, wherein low-order statistics of the 2-D images are computed and a 3-D structure is estimated by solving a system of polynomial equations. Unfortunately, Kam'"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05377","kind":"arxiv","version":2},"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/1907.05377/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":"2026-07-05T00:56:28Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dvwGwtCG2VOAltoL2zP91Ld9mwBWGAUnIxC5EgmsOeEE4vjsUHWb5gLADhNHvA/M2lp92hsCDf1b/NmMSHb2BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T22:02:57.289453Z"},"content_sha256":"f916bb0b35d854d81e1c72b7c65b486b1ed00233a2442abde618598a553ccd1c","schema_version":"1.0","event_id":"sha256:f916bb0b35d854d81e1c72b7c65b486b1ed00233a2442abde618598a553ccd1c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JIABTB63X3PMKZ7TD47WJFVZP2/bundle.json","state_url":"https://pith.science/pith/JIABTB63X3PMKZ7TD47WJFVZP2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JIABTB63X3PMKZ7TD47WJFVZP2/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":"2026-08-16T22:02:57Z","links":{"resolver":"https://pith.science/pith/JIABTB63X3PMKZ7TD47WJFVZP2","bundle":"https://pith.science/pith/JIABTB63X3PMKZ7TD47WJFVZP2/bundle.json","state":"https://pith.science/pith/JIABTB63X3PMKZ7TD47WJFVZP2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JIABTB63X3PMKZ7TD47WJFVZP2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:JIABTB63X3PMKZ7TD47WJFVZP2","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":"7fd6e7cae5369c5809d0604ef4fd1b0164c0eff1c9ee37c28267b7f65ef89c95","cross_cats_sorted":["cs.NA","math.OC","q-bio.BM","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2019-07-11T16:53:34Z","title_canon_sha256":"0142ffe73ff7c6f35881657a66bc07e411016b40597f0d2fd9d0a5a81f1979c5"},"schema_version":"1.0","source":{"id":"1907.05377","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1907.05377","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"arxiv_version","alias_value":"1907.05377v2","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1907.05377","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_12","alias_value":"JIABTB63X3PM","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_16","alias_value":"JIABTB63X3PMKZ7T","created_at":"2026-07-05T00:56:28Z"},{"alias_kind":"pith_short_8","alias_value":"JIABTB63","created_at":"2026-07-05T00:56:28Z"}],"graph_snapshots":[{"event_id":"sha256:f916bb0b35d854d81e1c72b7c65b486b1ed00233a2442abde618598a553ccd1c","target":"graph","created_at":"2026-07-05T00:56:28Z","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/1907.05377/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Single-particle reconstruction in cryo-electron microscopy (cryo-EM) is an increasingly popular technique for determining the 3-D structure of a molecule from several noisy 2-D projections images taken at unknown viewing angles. Most reconstruction algorithms require a low-resolution initialization for the 3-D structure, which is the goal of ab initio modeling. Suggested by Zvi Kam in 1980, the method of moments (MoM) offers one approach, wherein low-order statistics of the 2-D images are computed and a 3-D structure is estimated by solving a system of polynomial equations. Unfortunately, Kam'","authors_text":"Amit Singer, Boris Landa, Joe Kileel, Nir Sharon, YueHaw Khoo","cross_cats":["cs.NA","math.OC","q-bio.BM","stat.AP"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2019-07-11T16:53:34Z","title":"Method of moments for 3-D single particle ab initio modeling with non-uniform distribution of viewing angles"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1907.05377","kind":"arxiv","version":2},"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":"sha256:5f9d7b2a1f7fb4ff3f5f34f4c6779f4cce10ba7c548b230cb02f68caae06150b","target":"record","created_at":"2026-07-05T00:56:28Z","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":"7fd6e7cae5369c5809d0604ef4fd1b0164c0eff1c9ee37c28267b7f65ef89c95","cross_cats_sorted":["cs.NA","math.OC","q-bio.BM","stat.AP"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"math.NA","submitted_at":"2019-07-11T16:53:34Z","title_canon_sha256":"0142ffe73ff7c6f35881657a66bc07e411016b40597f0d2fd9d0a5a81f1979c5"},"schema_version":"1.0","source":{"id":"1907.05377","kind":"arxiv","version":2}},"canonical_sha256":"4a001987dbbedec567f31f3f6496b97eae967e5181d65048775ceb870ab48eb6","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4a001987dbbedec567f31f3f6496b97eae967e5181d65048775ceb870ab48eb6","first_computed_at":"2026-07-05T00:56:28.587296Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:56:28.587296Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"eDDjg3P63LQmvTBBLCpf8xRVX9OhjfE6qZQNxFx1fQS/tPH2jo0j27Zgr3dP4OUtT8cUcUsiP4DPRVtNoaRyAg==","signature_status":"signed_v1","signed_at":"2026-07-05T00:56:28.587747Z","signed_message":"canonical_sha256_bytes"},"source_id":"1907.05377","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5f9d7b2a1f7fb4ff3f5f34f4c6779f4cce10ba7c548b230cb02f68caae06150b","sha256:f916bb0b35d854d81e1c72b7c65b486b1ed00233a2442abde618598a553ccd1c"],"state_sha256":"5b02443181e091cbb04225d032b942c3e309505d53261b2b40e1420fa75bb688"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QPmmhtMLOMtvNiX6k3uZ+jwhRzADq31caQvBiqsVbr3oiuxv2S8fiAItEnG2DOmzsue3U0OIHT/hdYiAAqqQBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T22:02:57.295914Z","bundle_sha256":"3930b937c8c673a16696af8350be0b369ab6e318fc796a9ba464e593a9007ca7"}}