{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:G4DSZO2WNOMUP33BAMKPMZDVUY","short_pith_number":"pith:G4DSZO2W","canonical_record":{"source":{"id":"1608.03025","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-10T02:03:34Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2075b08f931a9cd60161ce28d266efb0430f594c77c2e2ea2d60b0e8c6ed2154","abstract_canon_sha256":"eaefb56fa3cc78b8e8c1a95a12fbd66324502935ea2897fe407e302917460e9a"},"schema_version":"1.0"},"canonical_sha256":"37072cbb566b9947ef610314f66475a614ba5f9babb5cd4240e74afad6b4c3a3","source":{"kind":"arxiv","id":"1608.03025","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03025","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03025v1","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03025","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"pith_short_12","alias_value":"G4DSZO2WNOMU","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"G4DSZO2WNOMUP33B","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"G4DSZO2W","created_at":"2026-05-18T12:30:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:G4DSZO2WNOMUP33BAMKPMZDVUY","target":"record","payload":{"canonical_record":{"source":{"id":"1608.03025","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-10T02:03:34Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2075b08f931a9cd60161ce28d266efb0430f594c77c2e2ea2d60b0e8c6ed2154","abstract_canon_sha256":"eaefb56fa3cc78b8e8c1a95a12fbd66324502935ea2897fe407e302917460e9a"},"schema_version":"1.0"},"canonical_sha256":"37072cbb566b9947ef610314f66475a614ba5f9babb5cd4240e74afad6b4c3a3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:52:39.075118Z","signature_b64":"ggAwFEYfnOOj2Dr+LCblMXeUcfYVLlTTMliXo8BiwxNpjqEovsPbPUwSg/2Yjdxlkd3dClXTaSlnVxnUt0M8DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"37072cbb566b9947ef610314f66475a614ba5f9babb5cd4240e74afad6b4c3a3","last_reissued_at":"2026-05-18T00:52:39.074646Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:52:39.074646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1608.03025","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":"2026-05-18T00:52:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Y5KALQdSkngHIutq0xUghhPXzYcbnmhPE0ZLwPJtQasB6FKDTknPByAnxfD/ndLj1JGM/uUNzyfJS2EHCp6rCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:20:46.703846Z"},"content_sha256":"ea49fee61240d72c9befe05323e2ee8105a8c208269bcaa6e8d3b43cc7596b60","schema_version":"1.0","event_id":"sha256:ea49fee61240d72c9befe05323e2ee8105a8c208269bcaa6e8d3b43cc7596b60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:G4DSZO2WNOMUP33BAMKPMZDVUY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"POLARBEAR-2: an instrument for CMB polarization measurements","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Bender, A. Cukierman, A. Ducout, A. Jaffe, A. J. Gilbert, A. Kusaka, A. Tikhomirol, A. T. Lee, A. Zahn, B. Barch, B. D. Sherwin, B. G. Keating, C. Aleman, C. Baccigalupi, C. Feng, C. Hill, C. L. Reichardt, C. Ross, C. R. Raum, D. Barron, D. Boettger, D. Leon, D. Poletti, E. V. Linder, F. Irie, F. Matsuda, G. Fabbian, G. Fuller, G. Hall, G. Jaehnig, G. M. Rebeiz, G. P. Teply, G. Puglisi, H. Nishino, H. Paar, I. Shirley, J. Borrill, J. Errard, J. Groh, J.Montgomery, J. Peloton, J. P. Kaufman, K. Arnold, K. Hattori, K. Kazemzadeh, K. Mizukami, K. M. Rotermund, L. Howe, L. Lowry, M. A. Dobbs, M. Hasegawa, M. Hazumi, M. Le Jeune, M. Navaroli, N. Goeckner-Wald, N. Halverson, N.Katayama, N. Miller, N. Stebor, N.Whitehorn, O. Jeongh, O. Tajima, O. Zahn, P. Ade, P. L. Richards, P. Siritanasak, R. Dunner, R. Keskital, R. Stompor A. Suzuki, S. Chapman, S. Feeney, S. Takada, S. Takatori, T. de Haan, T. Elleflot, T. Hamada, T.Kisner, T. Matsumura, T. Tomaru, W. L. Holzapfel, Y. Akiba, Y. Chinone, Y. Hori, Y. Inoue, Y. Segaw, Z. Kermish","submitted_at":"2016-08-10T02:03:34Z","abstract_excerpt":"POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment that will be located in the Atacama highland in Chile at an altitude of 5200 m. Its science goals are to measure the CMB polarization signals originating from both primordial gravitational waves and weak lensing. PB-2 is designed to measure the tensor to scalar ratio, r, with precision {\\sigma}(r) < 0.01, and the sum of neutrino masses, {\\Sigma}m{\\nu}, with {\\sigma}({\\Sigma}m{\\nu}) < 90 meV. To achieve these goals, PB-2 will employ 7588 transition-edge sensor bolometers at 95 GHz and 150 GHz, which will be operat"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03025","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":"2026-05-18T00:52:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MNHtMIJDiv+a4WA/m+McI79zTrcbWjghd4WwE3k/LKbT0sXy9DCQRdd2N3NwFv+dU+U6lXkll+t7fMTDjOowAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T20:20:46.704683Z"},"content_sha256":"84cb9d898e6e7f83386037500fe4fbcede52077d7ec518188c40eadb42748b45","schema_version":"1.0","event_id":"sha256:84cb9d898e6e7f83386037500fe4fbcede52077d7ec518188c40eadb42748b45"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/bundle.json","state_url":"https://pith.science/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/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":"2026-05-30T20:20:46Z","links":{"resolver":"https://pith.science/pith/G4DSZO2WNOMUP33BAMKPMZDVUY","bundle":"https://pith.science/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/bundle.json","state":"https://pith.science/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G4DSZO2WNOMUP33BAMKPMZDVUY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:G4DSZO2WNOMUP33BAMKPMZDVUY","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":"eaefb56fa3cc78b8e8c1a95a12fbd66324502935ea2897fe407e302917460e9a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-10T02:03:34Z","title_canon_sha256":"2075b08f931a9cd60161ce28d266efb0430f594c77c2e2ea2d60b0e8c6ed2154"},"schema_version":"1.0","source":{"id":"1608.03025","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1608.03025","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"arxiv_version","alias_value":"1608.03025v1","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1608.03025","created_at":"2026-05-18T00:52:39Z"},{"alias_kind":"pith_short_12","alias_value":"G4DSZO2WNOMU","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_16","alias_value":"G4DSZO2WNOMUP33B","created_at":"2026-05-18T12:30:15Z"},{"alias_kind":"pith_short_8","alias_value":"G4DSZO2W","created_at":"2026-05-18T12:30:15Z"}],"graph_snapshots":[{"event_id":"sha256:84cb9d898e6e7f83386037500fe4fbcede52077d7ec518188c40eadb42748b45","target":"graph","created_at":"2026-05-18T00:52:39Z","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"},"paper":{"abstract_excerpt":"POLARBEAR-2 (PB-2) is a cosmic microwave background (CMB) polarization experiment that will be located in the Atacama highland in Chile at an altitude of 5200 m. Its science goals are to measure the CMB polarization signals originating from both primordial gravitational waves and weak lensing. PB-2 is designed to measure the tensor to scalar ratio, r, with precision {\\sigma}(r) < 0.01, and the sum of neutrino masses, {\\Sigma}m{\\nu}, with {\\sigma}({\\Sigma}m{\\nu}) < 90 meV. To achieve these goals, PB-2 will employ 7588 transition-edge sensor bolometers at 95 GHz and 150 GHz, which will be operat","authors_text":"A. Bender, A. Cukierman, A. Ducout, A. Jaffe, A. J. Gilbert, A. Kusaka, A. Tikhomirol, A. T. Lee, A. Zahn, B. Barch, B. D. Sherwin, B. G. Keating, C. Aleman, C. Baccigalupi, C. Feng, C. Hill, C. L. Reichardt, C. Ross, C. R. Raum, D. Barron, D. Boettger, D. Leon, D. Poletti, E. V. Linder, F. Irie, F. Matsuda, G. Fabbian, G. Fuller, G. Hall, G. Jaehnig, G. M. Rebeiz, G. P. Teply, G. Puglisi, H. Nishino, H. Paar, I. Shirley, J. Borrill, J. Errard, J. Groh, J.Montgomery, J. Peloton, J. P. Kaufman, K. Arnold, K. Hattori, K. Kazemzadeh, K. Mizukami, K. M. Rotermund, L. Howe, L. Lowry, M. A. Dobbs, M. Hasegawa, M. Hazumi, M. Le Jeune, M. Navaroli, N. Goeckner-Wald, N. Halverson, N.Katayama, N. Miller, N. Stebor, N.Whitehorn, O. Jeongh, O. Tajima, O. Zahn, P. Ade, P. L. Richards, P. Siritanasak, R. Dunner, R. Keskital, R. Stompor A. Suzuki, S. Chapman, S. Feeney, S. Takada, S. Takatori, T. de Haan, T. Elleflot, T. Hamada, T.Kisner, T. Matsumura, T. Tomaru, W. L. Holzapfel, Y. Akiba, Y. Chinone, Y. Hori, Y. Inoue, Y. Segaw, Z. Kermish","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-10T02:03:34Z","title":"POLARBEAR-2: an instrument for CMB polarization measurements"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1608.03025","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:ea49fee61240d72c9befe05323e2ee8105a8c208269bcaa6e8d3b43cc7596b60","target":"record","created_at":"2026-05-18T00:52:39Z","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":"eaefb56fa3cc78b8e8c1a95a12fbd66324502935ea2897fe407e302917460e9a","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-08-10T02:03:34Z","title_canon_sha256":"2075b08f931a9cd60161ce28d266efb0430f594c77c2e2ea2d60b0e8c6ed2154"},"schema_version":"1.0","source":{"id":"1608.03025","kind":"arxiv","version":1}},"canonical_sha256":"37072cbb566b9947ef610314f66475a614ba5f9babb5cd4240e74afad6b4c3a3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"37072cbb566b9947ef610314f66475a614ba5f9babb5cd4240e74afad6b4c3a3","first_computed_at":"2026-05-18T00:52:39.074646Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:52:39.074646Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ggAwFEYfnOOj2Dr+LCblMXeUcfYVLlTTMliXo8BiwxNpjqEovsPbPUwSg/2Yjdxlkd3dClXTaSlnVxnUt0M8DA==","signature_status":"signed_v1","signed_at":"2026-05-18T00:52:39.075118Z","signed_message":"canonical_sha256_bytes"},"source_id":"1608.03025","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ea49fee61240d72c9befe05323e2ee8105a8c208269bcaa6e8d3b43cc7596b60","sha256:84cb9d898e6e7f83386037500fe4fbcede52077d7ec518188c40eadb42748b45"],"state_sha256":"177426f7f82553e1d1a4c5742c950dfb2861896d29c6c1d95f76be5087e62815"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"OCtFkgNpCTBVSZtvaezCKEnyG1qnqOxmDAu/RkR5Tvv3q8nEeVIuZYi+RLn1Tm+6x7bRbakHFPD60ixs7bFZBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T20:20:46.708659Z","bundle_sha256":"952606168439569c99f7456310eb74d78af767c8a4667b8a89bc6a8c7b6adda7"}}