{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:3O4AKFY6IHZIQQLII5UE7NWWBC","short_pith_number":"pith:3O4AKFY6","canonical_record":{"source":{"id":"1710.10236","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-10-27T16:46:55Z","cross_cats_sorted":[],"title_canon_sha256":"722b044355b28b66a00225e9becbc4656412b2e4f60a6ac02828cd7efcc2a5f2","abstract_canon_sha256":"b696203e7bcfb7df7c86361f5ab7835b33fe1b37ce112cd6443730fe044c21d9"},"schema_version":"1.0"},"canonical_sha256":"dbb805171e41f288416847684fb6d6089effb553113b3e5ce3be3beb60246035","source":{"kind":"arxiv","id":"1710.10236","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.10236","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"arxiv_version","alias_value":"1710.10236v2","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.10236","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"pith_short_12","alias_value":"3O4AKFY6IHZI","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"3O4AKFY6IHZIQQLI","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"3O4AKFY6","created_at":"2026-05-18T12:30:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:3O4AKFY6IHZIQQLII5UE7NWWBC","target":"record","payload":{"canonical_record":{"source":{"id":"1710.10236","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-10-27T16:46:55Z","cross_cats_sorted":[],"title_canon_sha256":"722b044355b28b66a00225e9becbc4656412b2e4f60a6ac02828cd7efcc2a5f2","abstract_canon_sha256":"b696203e7bcfb7df7c86361f5ab7835b33fe1b37ce112cd6443730fe044c21d9"},"schema_version":"1.0"},"canonical_sha256":"dbb805171e41f288416847684fb6d6089effb553113b3e5ce3be3beb60246035","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:47:49.200282Z","signature_b64":"nMgiR5WtmKmo4snQGqG3It7JKz47u8seGHK22oVCbUGouuvIcqlxLPcDTH6L+KSto7hLF0L2X2wKxuADU5+KDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dbb805171e41f288416847684fb6d6089effb553113b3e5ce3be3beb60246035","last_reissued_at":"2026-05-17T23:47:49.199691Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:47:49.199691Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.10236","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":"2026-05-17T23:47:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GGxhfcCIwFEY6T6VItOVFMTe/CKDXX4x3jyj4RP5+IFGbcIP7k1cXQpeeV8wVZXReR2vzO0ZHHwaRWK1J3JKDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T00:50:19.931264Z"},"content_sha256":"57a44602dcf12b8b95b3e2f3a02d712b60825e43a08df23d89e2125ceb7d10eb","schema_version":"1.0","event_id":"sha256:57a44602dcf12b8b95b3e2f3a02d712b60825e43a08df23d89e2125ceb7d10eb"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:3O4AKFY6IHZIQQLII5UE7NWWBC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Reconstructing Small Scale Lenses from the Cosmic Microwave Background Temperature Fluctuations","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Benjamin Horowitz, Blake D. Sherwin, Simone Ferraro","submitted_at":"2017-10-27T16:46:55Z","abstract_excerpt":"Cosmic Microwave Background (CMB) lensing is a powerful probe of the matter distribution in the Universe. The standard quadratic estimator, which is typically used to measure the lensing signal, is known to be suboptimal for low-noise polarization data from next-generation experiments. In this paper we explain why the quadratic estimator will also be suboptimal for measuring lensing on very small scales, even for measurements in temperature where this estimator typically performs well. Though maximum likelihood methods could be implemented to improve performance, we explore a much simpler solu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.10236","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":""},"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":"2026-05-17T23:47:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xIAKOtLHeKMYFy/V6UkI1gCsU6AM/wyjTvkiLTnehpB7sAqGeJk0RIkMSC8GXdqWb23QVsZfkOx+sKUI+AGyAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T00:50:19.931628Z"},"content_sha256":"b2835398d5634c849e14bbd385afd938cfb29190c3b47b1488295b08f2c443dc","schema_version":"1.0","event_id":"sha256:b2835398d5634c849e14bbd385afd938cfb29190c3b47b1488295b08f2c443dc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/bundle.json","state_url":"https://pith.science/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/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":"2026-06-02T00:50:19Z","links":{"resolver":"https://pith.science/pith/3O4AKFY6IHZIQQLII5UE7NWWBC","bundle":"https://pith.science/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/bundle.json","state":"https://pith.science/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3O4AKFY6IHZIQQLII5UE7NWWBC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:3O4AKFY6IHZIQQLII5UE7NWWBC","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":"b696203e7bcfb7df7c86361f5ab7835b33fe1b37ce112cd6443730fe044c21d9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-10-27T16:46:55Z","title_canon_sha256":"722b044355b28b66a00225e9becbc4656412b2e4f60a6ac02828cd7efcc2a5f2"},"schema_version":"1.0","source":{"id":"1710.10236","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.10236","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"arxiv_version","alias_value":"1710.10236v2","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.10236","created_at":"2026-05-17T23:47:49Z"},{"alias_kind":"pith_short_12","alias_value":"3O4AKFY6IHZI","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"3O4AKFY6IHZIQQLI","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"3O4AKFY6","created_at":"2026-05-18T12:30:58Z"}],"graph_snapshots":[{"event_id":"sha256:b2835398d5634c849e14bbd385afd938cfb29190c3b47b1488295b08f2c443dc","target":"graph","created_at":"2026-05-17T23:47:49Z","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"},"paper":{"abstract_excerpt":"Cosmic Microwave Background (CMB) lensing is a powerful probe of the matter distribution in the Universe. The standard quadratic estimator, which is typically used to measure the lensing signal, is known to be suboptimal for low-noise polarization data from next-generation experiments. In this paper we explain why the quadratic estimator will also be suboptimal for measuring lensing on very small scales, even for measurements in temperature where this estimator typically performs well. Though maximum likelihood methods could be implemented to improve performance, we explore a much simpler solu","authors_text":"Benjamin Horowitz, Blake D. Sherwin, Simone Ferraro","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-10-27T16:46:55Z","title":"Reconstructing Small Scale Lenses from the Cosmic Microwave Background Temperature Fluctuations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.10236","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":"sha256:57a44602dcf12b8b95b3e2f3a02d712b60825e43a08df23d89e2125ceb7d10eb","target":"record","created_at":"2026-05-17T23:47:49Z","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":"b696203e7bcfb7df7c86361f5ab7835b33fe1b37ce112cd6443730fe044c21d9","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2017-10-27T16:46:55Z","title_canon_sha256":"722b044355b28b66a00225e9becbc4656412b2e4f60a6ac02828cd7efcc2a5f2"},"schema_version":"1.0","source":{"id":"1710.10236","kind":"arxiv","version":2}},"canonical_sha256":"dbb805171e41f288416847684fb6d6089effb553113b3e5ce3be3beb60246035","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dbb805171e41f288416847684fb6d6089effb553113b3e5ce3be3beb60246035","first_computed_at":"2026-05-17T23:47:49.199691Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:47:49.199691Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"nMgiR5WtmKmo4snQGqG3It7JKz47u8seGHK22oVCbUGouuvIcqlxLPcDTH6L+KSto7hLF0L2X2wKxuADU5+KDA==","signature_status":"signed_v1","signed_at":"2026-05-17T23:47:49.200282Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.10236","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:57a44602dcf12b8b95b3e2f3a02d712b60825e43a08df23d89e2125ceb7d10eb","sha256:b2835398d5634c849e14bbd385afd938cfb29190c3b47b1488295b08f2c443dc"],"state_sha256":"8b42ee24b0e3bd02eb5593ceeee7ad481336fdbc0af2dbb7a119b69372a96673"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PaCMDWrpw8p4ZVZwOQdilMgIIUlv639a/93ue/sGo2sDfPIb/cxP6aDVkbDHOla5NqCQuWfvT9g6MUr57CKDBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T00:50:19.933518Z","bundle_sha256":"f5d5efd53f3570caaf5e1164daf186cefca9a57a362cdc780a6f903be00d4d5a"}}