{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:XSX3S6K3PNTCAL2IMD45FFO3E2","short_pith_number":"pith:XSX3S6K3","canonical_record":{"source":{"id":"2605.18659","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-18T17:05:30Z","cross_cats_sorted":[],"title_canon_sha256":"2b97789355b43c945fb34de63a5a85d3aae1a678e28d6dad45ed0059266160a8","abstract_canon_sha256":"a70e47abf6a47d6e16ae1ce6a84004b5be8b698daa129233c96142dd4c91a2a0"},"schema_version":"1.0"},"canonical_sha256":"bcafb9795b7b66202f4860f9d295db26a86cf2f2b3eb1d4aeed0a1ce8d1ffaf5","source":{"kind":"arxiv","id":"2605.18659","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.18659","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"arxiv_version","alias_value":"2605.18659v1","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.18659","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_12","alias_value":"XSX3S6K3PNTC","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_16","alias_value":"XSX3S6K3PNTCAL2I","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_8","alias_value":"XSX3S6K3","created_at":"2026-05-20T00:06:13Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:XSX3S6K3PNTCAL2IMD45FFO3E2","target":"record","payload":{"canonical_record":{"source":{"id":"2605.18659","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-18T17:05:30Z","cross_cats_sorted":[],"title_canon_sha256":"2b97789355b43c945fb34de63a5a85d3aae1a678e28d6dad45ed0059266160a8","abstract_canon_sha256":"a70e47abf6a47d6e16ae1ce6a84004b5be8b698daa129233c96142dd4c91a2a0"},"schema_version":"1.0"},"canonical_sha256":"bcafb9795b7b66202f4860f9d295db26a86cf2f2b3eb1d4aeed0a1ce8d1ffaf5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-20T00:06:13.242946Z","signature_b64":"0YeR0RnrfZJxuXvsZdOODbbbXrPvnCbT2vu0V1O/DmUuHPbAvov66c8LD1SZ5vrNkwYKvYlG2e4XwbbymyZ7Ag==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bcafb9795b7b66202f4860f9d295db26a86cf2f2b3eb1d4aeed0a1ce8d1ffaf5","last_reissued_at":"2026-05-20T00:06:13.242107Z","signature_status":"signed_v1","first_computed_at":"2026-05-20T00:06:13.242107Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.18659","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":"2026-05-20T00:06:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"C2P8i3g4t0shs3oGaYeaAdd0AYjwZXkdFb9rhgAph7aEz/rCQzc+cz4vC0URg+yyADwjubDkOvSipu8HCZMaCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T23:11:47.455189Z"},"content_sha256":"917e29e9178bdc68bf5e9d11b26479943447f5b925e3854c81ab8fc4300d6c83","schema_version":"1.0","event_id":"sha256:917e29e9178bdc68bf5e9d11b26479943447f5b925e3854c81ab8fc4300d6c83"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:XSX3S6K3PNTCAL2IMD45FFO3E2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Faster CMB lensing with control variates","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Blake D. Sherwin, Toshiya Namikawa","submitted_at":"2026-05-18T17:05:30Z","abstract_excerpt":"We present a new method for fast computation of the realization-dependent bias, a major computational bottleneck in measurements of the cosmic microwave background (CMB) lensing power spectrum. The method accelerates the bias calculation by differencing two correlated estimates: one based on fully realistic masked simulations and the other on isotropic simulations, for which the bias is analytically tractable. We show that our algorithm reduces the total computational cost of a lensing power spectrum measurement by approximately a factor of five for Atacama Cosmology Telescope- or Simons Obser"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.18659","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2605.18659/integrity.json","findings":[],"available":true,"detectors_run":[{"name":"claim_evidence","ran_at":"2026-05-20T00:01:59.153922Z","status":"completed","version":"1.0.0","findings_count":0}],"snapshot_sha256":"dce4bbd0ce0f3a01758d4f343bf0255b733611eb3ebeff2af3a01feb4547c31b"},"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":"2026-05-20T00:06:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dnVWzCnpt961GkbyNCakbVqoG0yWCwwnyfv3CaaFTZR1TqNodoVe/mD+u22SvNvU5CHUJFxust4KkpX0nVEqAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T23:11:47.455612Z"},"content_sha256":"008ada0ee71079ea73c580e02a25c5b8a05f4d65954e9e0a2e311f7d914b440f","schema_version":"1.0","event_id":"sha256:008ada0ee71079ea73c580e02a25c5b8a05f4d65954e9e0a2e311f7d914b440f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/bundle.json","state_url":"https://pith.science/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/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":"2026-05-21T23:11:47Z","links":{"resolver":"https://pith.science/pith/XSX3S6K3PNTCAL2IMD45FFO3E2","bundle":"https://pith.science/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/bundle.json","state":"https://pith.science/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XSX3S6K3PNTCAL2IMD45FFO3E2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:XSX3S6K3PNTCAL2IMD45FFO3E2","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":"a70e47abf6a47d6e16ae1ce6a84004b5be8b698daa129233c96142dd4c91a2a0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-18T17:05:30Z","title_canon_sha256":"2b97789355b43c945fb34de63a5a85d3aae1a678e28d6dad45ed0059266160a8"},"schema_version":"1.0","source":{"id":"2605.18659","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.18659","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"arxiv_version","alias_value":"2605.18659v1","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.18659","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_12","alias_value":"XSX3S6K3PNTC","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_16","alias_value":"XSX3S6K3PNTCAL2I","created_at":"2026-05-20T00:06:13Z"},{"alias_kind":"pith_short_8","alias_value":"XSX3S6K3","created_at":"2026-05-20T00:06:13Z"}],"graph_snapshots":[{"event_id":"sha256:008ada0ee71079ea73c580e02a25c5b8a05f4d65954e9e0a2e311f7d914b440f","target":"graph","created_at":"2026-05-20T00:06:13Z","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":[{"findings_count":0,"name":"claim_evidence","ran_at":"2026-05-20T00:01:59.153922Z","status":"completed","version":"1.0.0"}],"endpoint":"/pith/2605.18659/integrity.json","findings":[],"snapshot_sha256":"dce4bbd0ce0f3a01758d4f343bf0255b733611eb3ebeff2af3a01feb4547c31b","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a new method for fast computation of the realization-dependent bias, a major computational bottleneck in measurements of the cosmic microwave background (CMB) lensing power spectrum. The method accelerates the bias calculation by differencing two correlated estimates: one based on fully realistic masked simulations and the other on isotropic simulations, for which the bias is analytically tractable. We show that our algorithm reduces the total computational cost of a lensing power spectrum measurement by approximately a factor of five for Atacama Cosmology Telescope- or Simons Obser","authors_text":"Blake D. Sherwin, Toshiya Namikawa","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-18T17:05:30Z","title":"Faster CMB lensing with control variates"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.18659","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":"sha256:917e29e9178bdc68bf5e9d11b26479943447f5b925e3854c81ab8fc4300d6c83","target":"record","created_at":"2026-05-20T00:06:13Z","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":"a70e47abf6a47d6e16ae1ce6a84004b5be8b698daa129233c96142dd4c91a2a0","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.CO","submitted_at":"2026-05-18T17:05:30Z","title_canon_sha256":"2b97789355b43c945fb34de63a5a85d3aae1a678e28d6dad45ed0059266160a8"},"schema_version":"1.0","source":{"id":"2605.18659","kind":"arxiv","version":1}},"canonical_sha256":"bcafb9795b7b66202f4860f9d295db26a86cf2f2b3eb1d4aeed0a1ce8d1ffaf5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bcafb9795b7b66202f4860f9d295db26a86cf2f2b3eb1d4aeed0a1ce8d1ffaf5","first_computed_at":"2026-05-20T00:06:13.242107Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-20T00:06:13.242107Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"0YeR0RnrfZJxuXvsZdOODbbbXrPvnCbT2vu0V1O/DmUuHPbAvov66c8LD1SZ5vrNkwYKvYlG2e4XwbbymyZ7Ag==","signature_status":"signed_v1","signed_at":"2026-05-20T00:06:13.242946Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.18659","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:917e29e9178bdc68bf5e9d11b26479943447f5b925e3854c81ab8fc4300d6c83","sha256:008ada0ee71079ea73c580e02a25c5b8a05f4d65954e9e0a2e311f7d914b440f"],"state_sha256":"b85652098b8218b998dc21b02ddaf28f38cea65d36eacd49973f2c1867a9f1b4"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"nQqmmd9eq94RN6OW4a6xPl1Ulq8iewnjndlMM/EZH1/NDAJ1dyyAGs9wng0kWwZm0bUAPROd5CaGgq/pZViUAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T23:11:47.457945Z","bundle_sha256":"9eeefbe5350e89001824dab49f6555ebf57f66366aaf2dd803aecd8fe67d1e25"}}