{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:VJKXTFUDFL5QP2YBA4I7MYTOBM","short_pith_number":"pith:VJKXTFUD","canonical_record":{"source":{"id":"2501.08983","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-01-15T17:59:56Z","cross_cats_sorted":[],"title_canon_sha256":"e2cd4cf2f22e6d795289d76ccbf1caf1f358abfc6b66d0fc2471174aebe8f13a","abstract_canon_sha256":"fc18048153117ff533d694ef9ff53fbdd8ff11d658e665c45f236e63dc29df4e"},"schema_version":"1.0"},"canonical_sha256":"aa557996832afb07eb010711f6626e0b2acb31b58aaa05f3f9afe04eb47968a8","source":{"kind":"arxiv","id":"2501.08983","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.08983","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"arxiv_version","alias_value":"2501.08983v4","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.08983","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_12","alias_value":"VJKXTFUDFL5Q","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_16","alias_value":"VJKXTFUDFL5QP2YB","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_8","alias_value":"VJKXTFUD","created_at":"2026-07-05T12:02:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:VJKXTFUDFL5QP2YBA4I7MYTOBM","target":"record","payload":{"canonical_record":{"source":{"id":"2501.08983","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-01-15T17:59:56Z","cross_cats_sorted":[],"title_canon_sha256":"e2cd4cf2f22e6d795289d76ccbf1caf1f358abfc6b66d0fc2471174aebe8f13a","abstract_canon_sha256":"fc18048153117ff533d694ef9ff53fbdd8ff11d658e665c45f236e63dc29df4e"},"schema_version":"1.0"},"canonical_sha256":"aa557996832afb07eb010711f6626e0b2acb31b58aaa05f3f9afe04eb47968a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:02:39.659469Z","signature_b64":"Eo9Q2gaMdFb1gMHtGKWG/PtDnqfpWLtklewiENEWTDjkSJyVg/cwVeFpQHSvvb1bHKQsXR4Cv4lPtDVHNE2wDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"aa557996832afb07eb010711f6626e0b2acb31b58aaa05f3f9afe04eb47968a8","last_reissued_at":"2026-07-05T12:02:39.658971Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:02:39.658971Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2501.08983","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T12:02:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FLXVqeWYDk2+5E1lF3CwEkjVXXsE1n1GDnf63ML4g1AkFSL9i+wWK8hCwhnyXNir/gl9ei2nqA57B/5KpQHRDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:26:14.201026Z"},"content_sha256":"978055aa30de1ee374540447d04adb181cbd4e7d2e27fc4af7a3cdb454bd0c1e","schema_version":"1.0","event_id":"sha256:978055aa30de1ee374540447d04adb181cbd4e7d2e27fc4af7a3cdb454bd0c1e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:VJKXTFUDFL5QP2YBA4I7MYTOBM","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Compositional Generative Model of Unbounded 4D Cities","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.CV","authors_text":"Fangzhou Hong, Haozhe Xie, Zhaoxi Chen, Ziwei Liu","submitted_at":"2025-01-15T17:59:56Z","abstract_excerpt":"3D scene generation has garnered growing attention in recent years and has made significant progress. Generating 4D cities is more challenging than 3D scenes due to the presence of structurally complex, visually diverse objects like buildings and vehicles, and heightened human sensitivity to distortions in urban environments. To tackle these issues, we propose CityDreamer4D, a compositional generative model specifically tailored for generating unbounded 4D cities. Our main insights are 1) 4D city generation should separate dynamic objects (e.g., vehicles) from static scenes (e.g., buildings an"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.08983","kind":"arxiv","version":4},"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/2501.08983/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":"2026-07-05T12:02:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"akwmcGYybKxclwIr1IVNuogQ+WGKSces16hdFPeZParfIIH0cQq8nd67VlpnGIjG2dQq4eUQrKTqpYN655n/BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T05:26:14.210605Z"},"content_sha256":"1d650b060a58398205f4cb57f99bc38b3e5219f6588a8e12326de80e7ed62375","schema_version":"1.0","event_id":"sha256:1d650b060a58398205f4cb57f99bc38b3e5219f6588a8e12326de80e7ed62375"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/bundle.json","state_url":"https://pith.science/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/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":"2026-08-06T05:26:14Z","links":{"resolver":"https://pith.science/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM","bundle":"https://pith.science/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/bundle.json","state":"https://pith.science/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VJKXTFUDFL5QP2YBA4I7MYTOBM/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:VJKXTFUDFL5QP2YBA4I7MYTOBM","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":"fc18048153117ff533d694ef9ff53fbdd8ff11d658e665c45f236e63dc29df4e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-01-15T17:59:56Z","title_canon_sha256":"e2cd4cf2f22e6d795289d76ccbf1caf1f358abfc6b66d0fc2471174aebe8f13a"},"schema_version":"1.0","source":{"id":"2501.08983","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2501.08983","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"arxiv_version","alias_value":"2501.08983v4","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2501.08983","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_12","alias_value":"VJKXTFUDFL5Q","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_16","alias_value":"VJKXTFUDFL5QP2YB","created_at":"2026-07-05T12:02:39Z"},{"alias_kind":"pith_short_8","alias_value":"VJKXTFUD","created_at":"2026-07-05T12:02:39Z"}],"graph_snapshots":[{"event_id":"sha256:1d650b060a58398205f4cb57f99bc38b3e5219f6588a8e12326de80e7ed62375","target":"graph","created_at":"2026-07-05T12:02:39Z","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/2501.08983/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"3D scene generation has garnered growing attention in recent years and has made significant progress. Generating 4D cities is more challenging than 3D scenes due to the presence of structurally complex, visually diverse objects like buildings and vehicles, and heightened human sensitivity to distortions in urban environments. To tackle these issues, we propose CityDreamer4D, a compositional generative model specifically tailored for generating unbounded 4D cities. Our main insights are 1) 4D city generation should separate dynamic objects (e.g., vehicles) from static scenes (e.g., buildings an","authors_text":"Fangzhou Hong, Haozhe Xie, Zhaoxi Chen, Ziwei Liu","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-01-15T17:59:56Z","title":"Compositional Generative Model of Unbounded 4D Cities"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2501.08983","kind":"arxiv","version":4},"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":"sha256:978055aa30de1ee374540447d04adb181cbd4e7d2e27fc4af7a3cdb454bd0c1e","target":"record","created_at":"2026-07-05T12:02:39Z","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":"fc18048153117ff533d694ef9ff53fbdd8ff11d658e665c45f236e63dc29df4e","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CV","submitted_at":"2025-01-15T17:59:56Z","title_canon_sha256":"e2cd4cf2f22e6d795289d76ccbf1caf1f358abfc6b66d0fc2471174aebe8f13a"},"schema_version":"1.0","source":{"id":"2501.08983","kind":"arxiv","version":4}},"canonical_sha256":"aa557996832afb07eb010711f6626e0b2acb31b58aaa05f3f9afe04eb47968a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"aa557996832afb07eb010711f6626e0b2acb31b58aaa05f3f9afe04eb47968a8","first_computed_at":"2026-07-05T12:02:39.658971Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:02:39.658971Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Eo9Q2gaMdFb1gMHtGKWG/PtDnqfpWLtklewiENEWTDjkSJyVg/cwVeFpQHSvvb1bHKQsXR4Cv4lPtDVHNE2wDA==","signature_status":"signed_v1","signed_at":"2026-07-05T12:02:39.659469Z","signed_message":"canonical_sha256_bytes"},"source_id":"2501.08983","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:978055aa30de1ee374540447d04adb181cbd4e7d2e27fc4af7a3cdb454bd0c1e","sha256:1d650b060a58398205f4cb57f99bc38b3e5219f6588a8e12326de80e7ed62375"],"state_sha256":"92f91994c73681ea182712ef4f060acf43537d177cd11dca8b02c4a4b8d98c95"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oryaMhaSvrA8Lx+9T2sIlxF6OccAApPzDTtk/4GmLhf52g3NiJ8x5uRfTsc5Iy0+jmDolsebGkC1wtI05Dw/BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T05:26:14.218609Z","bundle_sha256":"993560423043ab32804d27e500768b42252723c745b03a61393b03b1a0ff1c5e"}}