{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2004:XYUD3AX77FPSPMTVG7RUDTYKOV","short_pith_number":"pith:XYUD3AX7","canonical_record":{"source":{"id":"astro-ph/0403175","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-03-08T08:06:31Z","cross_cats_sorted":[],"title_canon_sha256":"f1711efd4044281c9ffae2f5b77671e2202c2fb7d0eb889e3edc08749ef54081","abstract_canon_sha256":"a8abaefb8eeef6c87923c1ea91cdbadb33c98c97f310abb6c2096f11780e8110"},"schema_version":"1.0"},"canonical_sha256":"be283d82fff95f27b27537e341cf0a756043df71f90076954cba62a31d2230a8","source":{"kind":"arxiv","id":"astro-ph/0403175","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0403175","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0403175v1","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0403175","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"pith_short_12","alias_value":"XYUD3AX77FPS","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"XYUD3AX77FPSPMTV","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"XYUD3AX7","created_at":"2026-05-18T12:25:52Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2004:XYUD3AX77FPSPMTVG7RUDTYKOV","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0403175","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2004-03-08T08:06:31Z","cross_cats_sorted":[],"title_canon_sha256":"f1711efd4044281c9ffae2f5b77671e2202c2fb7d0eb889e3edc08749ef54081","abstract_canon_sha256":"a8abaefb8eeef6c87923c1ea91cdbadb33c98c97f310abb6c2096f11780e8110"},"schema_version":"1.0"},"canonical_sha256":"be283d82fff95f27b27537e341cf0a756043df71f90076954cba62a31d2230a8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:40:37.266989Z","signature_b64":"hVijqrZGQKpvgiQj0e/TwAdTg/7kUYt1fax4prpgn0UVwWGixRLOt0e0cwT+SN5+HZCYgvliTuKumycGLnNxDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"be283d82fff95f27b27537e341cf0a756043df71f90076954cba62a31d2230a8","last_reissued_at":"2026-05-18T01:40:37.266408Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:40:37.266408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0403175","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":"2026-05-18T01:40:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/gbI1gmfltGBNZHnazzEdjzQ7vnsS+E4bCoYsG0duS0uVNYqMPYd5Ut9kcprQXSCOhJ0vo+rhJ29qJ5S/O+LCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:36:14.300170Z"},"content_sha256":"3e1fe2ba2416effa61ad7cd66fdcbd3c2526fccd55814fff39941704ea69bf7e","schema_version":"1.0","event_id":"sha256:3e1fe2ba2416effa61ad7cd66fdcbd3c2526fccd55814fff39941704ea69bf7e"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2004:XYUD3AX77FPSPMTVG7RUDTYKOV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Polarization experiments","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"C. Rosset, J. Delabrouille, J. Kaplan, M. Piat","submitted_at":"2004-03-08T08:06:31Z","abstract_excerpt":"Possible instrumental set--ups for the measurement of CMB polarization are reviewed in this article. We discuss existing and planned instruments, putting special emphasis on observational, instrumental, and data processing issues for the detection of very low polarization signals of prime cosmological interest. A short prospective summary is included."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0403175","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":""},"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":"2026-05-18T01:40:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"okvA/6QldjZpKuOO8QsRebAwEoHycP/Zf159pcHzVsT/fOJ+GQHCc+0XSKwzce0Q22F9PjuAwNR4CiEDrSPeAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T08:36:14.300525Z"},"content_sha256":"b1112ce7a7976b0e3d27ecec43b24e51bbb281135db9513875d618fa85914f45","schema_version":"1.0","event_id":"sha256:b1112ce7a7976b0e3d27ecec43b24e51bbb281135db9513875d618fa85914f45"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/bundle.json","state_url":"https://pith.science/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/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":"2026-05-30T08:36:14Z","links":{"resolver":"https://pith.science/pith/XYUD3AX77FPSPMTVG7RUDTYKOV","bundle":"https://pith.science/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/bundle.json","state":"https://pith.science/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/XYUD3AX77FPSPMTVG7RUDTYKOV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2004:XYUD3AX77FPSPMTVG7RUDTYKOV","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":"a8abaefb8eeef6c87923c1ea91cdbadb33c98c97f310abb6c2096f11780e8110","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-03-08T08:06:31Z","title_canon_sha256":"f1711efd4044281c9ffae2f5b77671e2202c2fb7d0eb889e3edc08749ef54081"},"schema_version":"1.0","source":{"id":"astro-ph/0403175","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0403175","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0403175v1","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0403175","created_at":"2026-05-18T01:40:37Z"},{"alias_kind":"pith_short_12","alias_value":"XYUD3AX77FPS","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_16","alias_value":"XYUD3AX77FPSPMTV","created_at":"2026-05-18T12:25:52Z"},{"alias_kind":"pith_short_8","alias_value":"XYUD3AX7","created_at":"2026-05-18T12:25:52Z"}],"graph_snapshots":[{"event_id":"sha256:b1112ce7a7976b0e3d27ecec43b24e51bbb281135db9513875d618fa85914f45","target":"graph","created_at":"2026-05-18T01:40:37Z","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":"Possible instrumental set--ups for the measurement of CMB polarization are reviewed in this article. We discuss existing and planned instruments, putting special emphasis on observational, instrumental, and data processing issues for the detection of very low polarization signals of prime cosmological interest. A short prospective summary is included.","authors_text":"C. Rosset, J. Delabrouille, J. Kaplan, M. Piat","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2004-03-08T08:06:31Z","title":"Polarization experiments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0403175","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":"sha256:3e1fe2ba2416effa61ad7cd66fdcbd3c2526fccd55814fff39941704ea69bf7e","target":"record","created_at":"2026-05-18T01:40:37Z","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":"a8abaefb8eeef6c87923c1ea91cdbadb33c98c97f310abb6c2096f11780e8110","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2004-03-08T08:06:31Z","title_canon_sha256":"f1711efd4044281c9ffae2f5b77671e2202c2fb7d0eb889e3edc08749ef54081"},"schema_version":"1.0","source":{"id":"astro-ph/0403175","kind":"arxiv","version":1}},"canonical_sha256":"be283d82fff95f27b27537e341cf0a756043df71f90076954cba62a31d2230a8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"be283d82fff95f27b27537e341cf0a756043df71f90076954cba62a31d2230a8","first_computed_at":"2026-05-18T01:40:37.266408Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:40:37.266408Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"hVijqrZGQKpvgiQj0e/TwAdTg/7kUYt1fax4prpgn0UVwWGixRLOt0e0cwT+SN5+HZCYgvliTuKumycGLnNxDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:40:37.266989Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0403175","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3e1fe2ba2416effa61ad7cd66fdcbd3c2526fccd55814fff39941704ea69bf7e","sha256:b1112ce7a7976b0e3d27ecec43b24e51bbb281135db9513875d618fa85914f45"],"state_sha256":"cdbb0502f1cb5ae3309f8cb5472c19c6abcfd63cafedd2d6aa73877bf8edc05a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"vzS/1EBUA56MVb/sf/V9alTk4X1lXCLVweaYk/8axhVsWlaMHj0AvgilcpjMSzQI5qKDHDmlFPbMZV792Gr3Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T08:36:14.302436Z","bundle_sha256":"17ea6398ff3eaded30ab889fe90f315aa6aa5970ebed91c1a68b700a02fa694d"}}