{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:755MNHAT5WY5X6AIODDRQUPMJY","short_pith_number":"pith:755MNHAT","canonical_record":{"source":{"id":"2510.26851","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-10-30T14:58:49Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"317142531fd62c41e2bfd81bc41132dc95a1894f6a9828dfa63214c60bccd701","abstract_canon_sha256":"67a70e423c2afba2eef4bce0a04d58142c9432cd86c51ab74579151513f49ba5"},"schema_version":"1.0"},"canonical_sha256":"ff7ac69c13edb1dbf80870c71851ec4e3097556a3edd7d1de00900de670d9d86","source":{"kind":"arxiv","id":"2510.26851","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2510.26851","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"arxiv_version","alias_value":"2510.26851v2","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2510.26851","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_12","alias_value":"755MNHAT5WY5","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_16","alias_value":"755MNHAT5WY5X6AI","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_8","alias_value":"755MNHAT","created_at":"2026-07-08T14:18:56Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:755MNHAT5WY5X6AIODDRQUPMJY","target":"record","payload":{"canonical_record":{"source":{"id":"2510.26851","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-10-30T14:58:49Z","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"title_canon_sha256":"317142531fd62c41e2bfd81bc41132dc95a1894f6a9828dfa63214c60bccd701","abstract_canon_sha256":"67a70e423c2afba2eef4bce0a04d58142c9432cd86c51ab74579151513f49ba5"},"schema_version":"1.0"},"canonical_sha256":"ff7ac69c13edb1dbf80870c71851ec4e3097556a3edd7d1de00900de670d9d86","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-08T14:18:56.793186Z","signature_b64":"6jDIontBfiEZzPWvhm4r9uWAUCOthsDcoUuWmXtA+SL2lH6kXvhL8GlP+SkrlENqICLxqYlo/p0O5zA5FQEzBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ff7ac69c13edb1dbf80870c71851ec4e3097556a3edd7d1de00900de670d9d86","last_reissued_at":"2026-07-08T14:18:56.792675Z","signature_status":"signed_v1","first_computed_at":"2026-07-08T14:18:56.792675Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2510.26851","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":"2026-07-08T14:18:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"j88DiyFFUqs+QS3tTUudH6HdOkPkHeu6nEg0e3XKAAP84dmRXu//UgMJ3BPYlMW2meHFNWZeErCXtf5YDWynCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:47:03.727680Z"},"content_sha256":"021ee4d0d8d8e54ad9b850bd480c12f2263c390de4e7a9644a54f94917fbfb9e","schema_version":"1.0","event_id":"sha256:021ee4d0d8d8e54ad9b850bd480c12f2263c390de4e7a9644a54f94917fbfb9e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:755MNHAT5WY5X6AIODDRQUPMJY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"jFoF: GPU Cluster Finding with Gradient Propagation","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.CO","astro-ph.GA"],"primary_cat":"astro-ph.IM","authors_text":"Adrian E. Bayer, Benjamin Horowitz","submitted_at":"2025-10-30T14:58:49Z","abstract_excerpt":"We present jFoF, a fully GPU-native Friends-of-Friends (FoF) halo finder designed for both high-performance simulation analysis and differentiable modeling. Implemented in JAX, jFoF achieves end-to-end acceleration by performing all neighbor searches, label propagation, and group construction directly on GPUs, eliminating costly host--device transfers. We introduce two complementary neighbor-search strategies, a standard k-d tree and a novel linked-cell grid, and demonstrate that jFoF attains up to an order-of-magnitude speedup compared to optimized CPU implementations while maintaining consis"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2510.26851","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/2510.26851/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":"2026-07-08T14:18:56Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z5+/JW1Rp9lRZOIlOOIq6K1DJxCl0T31PBhtBs0LnJuyDyhoqTW11J9YAHT0SwfrIQMz3ujTnSsBTnOvspK2Dw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T19:47:03.728826Z"},"content_sha256":"12895ae9c0968b75ee5cd7929d50ee84f04553e9c84e715e1951c569a0b0a6e6","schema_version":"1.0","event_id":"sha256:12895ae9c0968b75ee5cd7929d50ee84f04553e9c84e715e1951c569a0b0a6e6"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/755MNHAT5WY5X6AIODDRQUPMJY/bundle.json","state_url":"https://pith.science/pith/755MNHAT5WY5X6AIODDRQUPMJY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/755MNHAT5WY5X6AIODDRQUPMJY/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":"2026-08-05T19:47:03Z","links":{"resolver":"https://pith.science/pith/755MNHAT5WY5X6AIODDRQUPMJY","bundle":"https://pith.science/pith/755MNHAT5WY5X6AIODDRQUPMJY/bundle.json","state":"https://pith.science/pith/755MNHAT5WY5X6AIODDRQUPMJY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/755MNHAT5WY5X6AIODDRQUPMJY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:755MNHAT5WY5X6AIODDRQUPMJY","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":"67a70e423c2afba2eef4bce0a04d58142c9432cd86c51ab74579151513f49ba5","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-10-30T14:58:49Z","title_canon_sha256":"317142531fd62c41e2bfd81bc41132dc95a1894f6a9828dfa63214c60bccd701"},"schema_version":"1.0","source":{"id":"2510.26851","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2510.26851","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"arxiv_version","alias_value":"2510.26851v2","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2510.26851","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_12","alias_value":"755MNHAT5WY5","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_16","alias_value":"755MNHAT5WY5X6AI","created_at":"2026-07-08T14:18:56Z"},{"alias_kind":"pith_short_8","alias_value":"755MNHAT","created_at":"2026-07-08T14:18:56Z"}],"graph_snapshots":[{"event_id":"sha256:12895ae9c0968b75ee5cd7929d50ee84f04553e9c84e715e1951c569a0b0a6e6","target":"graph","created_at":"2026-07-08T14:18:56Z","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/2510.26851/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present jFoF, a fully GPU-native Friends-of-Friends (FoF) halo finder designed for both high-performance simulation analysis and differentiable modeling. Implemented in JAX, jFoF achieves end-to-end acceleration by performing all neighbor searches, label propagation, and group construction directly on GPUs, eliminating costly host--device transfers. We introduce two complementary neighbor-search strategies, a standard k-d tree and a novel linked-cell grid, and demonstrate that jFoF attains up to an order-of-magnitude speedup compared to optimized CPU implementations while maintaining consis","authors_text":"Adrian E. Bayer, Benjamin Horowitz","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-10-30T14:58:49Z","title":"jFoF: GPU Cluster Finding with Gradient Propagation"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2510.26851","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":"sha256:021ee4d0d8d8e54ad9b850bd480c12f2263c390de4e7a9644a54f94917fbfb9e","target":"record","created_at":"2026-07-08T14:18:56Z","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":"67a70e423c2afba2eef4bce0a04d58142c9432cd86c51ab74579151513f49ba5","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2025-10-30T14:58:49Z","title_canon_sha256":"317142531fd62c41e2bfd81bc41132dc95a1894f6a9828dfa63214c60bccd701"},"schema_version":"1.0","source":{"id":"2510.26851","kind":"arxiv","version":2}},"canonical_sha256":"ff7ac69c13edb1dbf80870c71851ec4e3097556a3edd7d1de00900de670d9d86","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff7ac69c13edb1dbf80870c71851ec4e3097556a3edd7d1de00900de670d9d86","first_computed_at":"2026-07-08T14:18:56.792675Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-08T14:18:56.792675Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6jDIontBfiEZzPWvhm4r9uWAUCOthsDcoUuWmXtA+SL2lH6kXvhL8GlP+SkrlENqICLxqYlo/p0O5zA5FQEzBg==","signature_status":"signed_v1","signed_at":"2026-07-08T14:18:56.793186Z","signed_message":"canonical_sha256_bytes"},"source_id":"2510.26851","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:021ee4d0d8d8e54ad9b850bd480c12f2263c390de4e7a9644a54f94917fbfb9e","sha256:12895ae9c0968b75ee5cd7929d50ee84f04553e9c84e715e1951c569a0b0a6e6"],"state_sha256":"a9111ef8dcb4590a4ec94c1ec75507a3097fa8d02d21cb2a19a8ea3165a2da8a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pupMGgdI2b2QpXjmJHfHIxmnMIdRW8117oSKtl7HxJhqBF+vE78SjLfSm4tSgwoTfGMILKosdtSKuFAcipbaAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T19:47:03.734486Z","bundle_sha256":"f40751292f12ceea369a6387e52c2d5525e4bc6b59b539ab96d6138e7491bbe2"}}