{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:F52N43KLCD5OAJ6JR222M5X4CQ","short_pith_number":"pith:F52N43KL","canonical_record":{"source":{"id":"1908.08217","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T06:22:16Z","cross_cats_sorted":[],"title_canon_sha256":"47900541a13ab4ce95ab2ce827d771ccda8ec01e44030ead71c5c0e8dd862fdf","abstract_canon_sha256":"0ef69b975bed32eac0ab0f3971eeb34430e78593fc0c039026ac654188ca4e9a"},"schema_version":"1.0"},"canonical_sha256":"2f74de6d4b10fae027c98eb5a676fc1422388ef3ac3879b1befbe9a01b925d37","source":{"kind":"arxiv","id":"1908.08217","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08217","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08217v2","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08217","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_12","alias_value":"F52N43KLCD5O","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"F52N43KLCD5OAJ6J","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"F52N43KL","created_at":"2026-07-05T00:28:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:F52N43KLCD5OAJ6JR222M5X4CQ","target":"record","payload":{"canonical_record":{"source":{"id":"1908.08217","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T06:22:16Z","cross_cats_sorted":[],"title_canon_sha256":"47900541a13ab4ce95ab2ce827d771ccda8ec01e44030ead71c5c0e8dd862fdf","abstract_canon_sha256":"0ef69b975bed32eac0ab0f3971eeb34430e78593fc0c039026ac654188ca4e9a"},"schema_version":"1.0"},"canonical_sha256":"2f74de6d4b10fae027c98eb5a676fc1422388ef3ac3879b1befbe9a01b925d37","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:28:52.197446Z","signature_b64":"fa+kYhUyn9ejxVVulqCQd0fkiAAk9OZhol3knWp0cKoigKKffukpjGb3tojn1O/pJETx/9Gu8Fi8850rAxK5Bw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2f74de6d4b10fae027c98eb5a676fc1422388ef3ac3879b1befbe9a01b925d37","last_reissued_at":"2026-07-05T00:28:52.196962Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:28:52.196962Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1908.08217","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":"2026-07-05T00:28:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F7X36c9PpCLEtSY0WcWip7CqSEEiHod0dgFLokqJ77PaIRmuPeuNrC7nNOqp0VIhgE+8OrgTr+N6LsZWNMZOAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T02:31:02.589186Z"},"content_sha256":"32b4476f31a701d582cdcf7fc7b66f470c1755a495d16507ba49bc8cfc0c0fa4","schema_version":"1.0","event_id":"sha256:32b4476f31a701d582cdcf7fc7b66f470c1755a495d16507ba49bc8cfc0c0fa4"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:F52N43KLCD5OAJ6JR222M5X4CQ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Nonlinear Reconstruction of the Velocity Field","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Hong-Ming Zhu, Yu Yu","submitted_at":"2019-08-22T06:22:16Z","abstract_excerpt":"We propose a new velocity reconstruction method based on the displacement estimation by recently developed methods. The velocity is first reconstructed by transfer functions in Lagrangian space and then mapped into Eulerian space. High resolution simulations are used to test the performance. We find that the new reconstruction method outperforms the standard velocity reconstruction in the sense of better cross-correlation coefficient, less velocity misalignment and smaller amplitude difference. We conclude that this new method has the potential to improve the large-scale structure sciences inv"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08217","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/1908.08217/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":"2026-07-05T00:28:52Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"CgIpxjo2n93AB0f/qhRqUMgdCQ5SypVJYTxBLWCsoKDq/fgSJGJdOzc6Z2UQmtZSapxBzQrco3pBP6g3A8l7CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-07T02:31:02.589829Z"},"content_sha256":"7ac17fcfc75bff86d602ef1afd8aa405690463113efcb2c96c0778733ba4c9cc","schema_version":"1.0","event_id":"sha256:7ac17fcfc75bff86d602ef1afd8aa405690463113efcb2c96c0778733ba4c9cc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/F52N43KLCD5OAJ6JR222M5X4CQ/bundle.json","state_url":"https://pith.science/pith/F52N43KLCD5OAJ6JR222M5X4CQ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/F52N43KLCD5OAJ6JR222M5X4CQ/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":"2026-08-07T02:31:02Z","links":{"resolver":"https://pith.science/pith/F52N43KLCD5OAJ6JR222M5X4CQ","bundle":"https://pith.science/pith/F52N43KLCD5OAJ6JR222M5X4CQ/bundle.json","state":"https://pith.science/pith/F52N43KLCD5OAJ6JR222M5X4CQ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/F52N43KLCD5OAJ6JR222M5X4CQ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:F52N43KLCD5OAJ6JR222M5X4CQ","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":"0ef69b975bed32eac0ab0f3971eeb34430e78593fc0c039026ac654188ca4e9a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T06:22:16Z","title_canon_sha256":"47900541a13ab4ce95ab2ce827d771ccda8ec01e44030ead71c5c0e8dd862fdf"},"schema_version":"1.0","source":{"id":"1908.08217","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1908.08217","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"arxiv_version","alias_value":"1908.08217v2","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1908.08217","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_12","alias_value":"F52N43KLCD5O","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_16","alias_value":"F52N43KLCD5OAJ6J","created_at":"2026-07-05T00:28:52Z"},{"alias_kind":"pith_short_8","alias_value":"F52N43KL","created_at":"2026-07-05T00:28:52Z"}],"graph_snapshots":[{"event_id":"sha256:7ac17fcfc75bff86d602ef1afd8aa405690463113efcb2c96c0778733ba4c9cc","target":"graph","created_at":"2026-07-05T00:28:52Z","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/1908.08217/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We propose a new velocity reconstruction method based on the displacement estimation by recently developed methods. The velocity is first reconstructed by transfer functions in Lagrangian space and then mapped into Eulerian space. High resolution simulations are used to test the performance. We find that the new reconstruction method outperforms the standard velocity reconstruction in the sense of better cross-correlation coefficient, less velocity misalignment and smaller amplitude difference. We conclude that this new method has the potential to improve the large-scale structure sciences inv","authors_text":"Hong-Ming Zhu, Yu Yu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T06:22:16Z","title":"Nonlinear Reconstruction of the Velocity Field"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1908.08217","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":"sha256:32b4476f31a701d582cdcf7fc7b66f470c1755a495d16507ba49bc8cfc0c0fa4","target":"record","created_at":"2026-07-05T00:28:52Z","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":"0ef69b975bed32eac0ab0f3971eeb34430e78593fc0c039026ac654188ca4e9a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2019-08-22T06:22:16Z","title_canon_sha256":"47900541a13ab4ce95ab2ce827d771ccda8ec01e44030ead71c5c0e8dd862fdf"},"schema_version":"1.0","source":{"id":"1908.08217","kind":"arxiv","version":2}},"canonical_sha256":"2f74de6d4b10fae027c98eb5a676fc1422388ef3ac3879b1befbe9a01b925d37","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2f74de6d4b10fae027c98eb5a676fc1422388ef3ac3879b1befbe9a01b925d37","first_computed_at":"2026-07-05T00:28:52.196962Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:28:52.196962Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"fa+kYhUyn9ejxVVulqCQd0fkiAAk9OZhol3knWp0cKoigKKffukpjGb3tojn1O/pJETx/9Gu8Fi8850rAxK5Bw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:28:52.197446Z","signed_message":"canonical_sha256_bytes"},"source_id":"1908.08217","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:32b4476f31a701d582cdcf7fc7b66f470c1755a495d16507ba49bc8cfc0c0fa4","sha256:7ac17fcfc75bff86d602ef1afd8aa405690463113efcb2c96c0778733ba4c9cc"],"state_sha256":"6678037dba82dca8d7a7702593f0abebed4027b7c4491500b55ec3126889086f"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZLJ+03oAmgAEHyyt1OxVIU4WeS7Lb5JSvnx5O5JpCxuAugzPDqtpZ2ER3wdFekiAXNzIwUMO+3W+fzdFc9mbBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-07T02:31:02.596085Z","bundle_sha256":"d200aeab5a9cf02bb624da6656aeedd49e15602023509f4d28db5d4c30408862"}}