{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:AFGDGM2RZGOU5RAO6YFHKTWXDU","short_pith_number":"pith:AFGDGM2R","canonical_record":{"source":{"id":"1601.02073","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-09T04:30:54Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"9013f77f9b590be933177588c07b3b15fc63b5b091a32adb6c6dbf558a24d4a6","abstract_canon_sha256":"a24e9f9e8a8b60006af5b5f84a9abeaee742d61af4ff82ccadbd6af8492a79cb"},"schema_version":"1.0"},"canonical_sha256":"014c333351c99d4ec40ef60a754ed71d3a944adab18fb510e6b994c06928248f","source":{"kind":"arxiv","id":"1601.02073","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02073","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02073v1","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02073","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"pith_short_12","alias_value":"AFGDGM2RZGOU","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"AFGDGM2RZGOU5RAO","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"AFGDGM2R","created_at":"2026-05-18T12:30:07Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:AFGDGM2RZGOU5RAO6YFHKTWXDU","target":"record","payload":{"canonical_record":{"source":{"id":"1601.02073","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-09T04:30:54Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"9013f77f9b590be933177588c07b3b15fc63b5b091a32adb6c6dbf558a24d4a6","abstract_canon_sha256":"a24e9f9e8a8b60006af5b5f84a9abeaee742d61af4ff82ccadbd6af8492a79cb"},"schema_version":"1.0"},"canonical_sha256":"014c333351c99d4ec40ef60a754ed71d3a944adab18fb510e6b994c06928248f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:25.181914Z","signature_b64":"q4QHGv4jeaMeXote5VQIxLz5DqlA/vbTPvmfOOG4MJtCuvpy1g8iuuoNl6m1RmthVYGCW+l3igAjilsT9FgTAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"014c333351c99d4ec40ef60a754ed71d3a944adab18fb510e6b994c06928248f","last_reissued_at":"2026-05-18T01:19:25.181093Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:25.181093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1601.02073","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":"2026-05-18T01:19:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"lXls9kxTo36qxobpJRKiZqmo5GaJSPOXxEIcCCtHsR6K8lRWq1azHRIzMlNSTSq8Zp56BC1MVl0/vvbvn1+DCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:58:46.567835Z"},"content_sha256":"452b7e73508d90a2bc57634a7f8c00cc52916f8e113823e038301b6ac4d5ecc7","schema_version":"1.0","event_id":"sha256:452b7e73508d90a2bc57634a7f8c00cc52916f8e113823e038301b6ac4d5ecc7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:AFGDGM2RZGOU5RAO6YFHKTWXDU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"CHIPS: The Cosmological HI Power Spectrum Estimator","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. de Oliveira-Costa, A. Ewall-Wice, A. Loeb, A. P. Beardsley, A. R. Neben, A. R. Offringa, A. Williams, Bart Pindor, Benjamin McKinley, B. J. Hazelton, Cathryn M. Trott, C. J. Lonsdale, C. L. Williams, C. Wu, Daniel A. Mitchell, Daniel C. Jacobs, D. L. Kaplan, D. Oberoi, E. Lenc, E. Morgan, F. Briggs, G. Bernardi, HS Kim, I. S. Sullivan, J. C. Pober, J. Line, J. N. Hewitt, Joshua S. Dillon, J. Riding, J. S. B. Wyithe, Judd D. Bowman, K. S. Srivani, L. Feng, L. J. Greenhill, M. F. Morales, M. Johnston-Hollitt, M. Tegmark, N. Barry, N. Hurley-Walker, Nithyanandan Thyagarajan, N. Udaya Shankar, P. Carroll, Pietro Procopio, Randall B. Wayth, R. J. Cappallo, R. L. Webster, R. Subrahmanyan, Shiv K. Sethi, S. M. Ord, S. Paul, Steven J. Tingay, T. Prabu","submitted_at":"2016-01-09T04:30:54Z","abstract_excerpt":"Detection of the cosmological neutral hydrogen signal from the Epoch of Reionization, and estimation of its basic physical parameters, is the principal scientific aim of many current low-frequency radio telescopes. Here we describe the Cosmological HI Power Spectrum Estimator (CHIPS), an algorithm developed and implemented with data from the Murchison Widefield Array (MWA), to compute the two-dimensional and spherically-averaged power spectrum of brightness temperature fluctuations. The principal motivations for CHIPS are the application of realistic instrumental and foreground models to form "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02073","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":"2026-05-18T01:19:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WvAwfOxyevIxY1QnKteCoJdGNq8stvHmelAIJifSVxyxH8ADCyVzPLMYQq2K4V8lZBdNT0U9pLBK7k/O086oCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T18:58:46.568548Z"},"content_sha256":"9caa1301100b1173b255332cbbc480032c001d4d578a8eeeb405f0b431037d8e","schema_version":"1.0","event_id":"sha256:9caa1301100b1173b255332cbbc480032c001d4d578a8eeeb405f0b431037d8e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/bundle.json","state_url":"https://pith.science/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/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":"2026-05-26T18:58:46Z","links":{"resolver":"https://pith.science/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU","bundle":"https://pith.science/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/bundle.json","state":"https://pith.science/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/AFGDGM2RZGOU5RAO6YFHKTWXDU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:AFGDGM2RZGOU5RAO6YFHKTWXDU","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":"a24e9f9e8a8b60006af5b5f84a9abeaee742d61af4ff82ccadbd6af8492a79cb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-09T04:30:54Z","title_canon_sha256":"9013f77f9b590be933177588c07b3b15fc63b5b091a32adb6c6dbf558a24d4a6"},"schema_version":"1.0","source":{"id":"1601.02073","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1601.02073","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"arxiv_version","alias_value":"1601.02073v1","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1601.02073","created_at":"2026-05-18T01:19:25Z"},{"alias_kind":"pith_short_12","alias_value":"AFGDGM2RZGOU","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_16","alias_value":"AFGDGM2RZGOU5RAO","created_at":"2026-05-18T12:30:07Z"},{"alias_kind":"pith_short_8","alias_value":"AFGDGM2R","created_at":"2026-05-18T12:30:07Z"}],"graph_snapshots":[{"event_id":"sha256:9caa1301100b1173b255332cbbc480032c001d4d578a8eeeb405f0b431037d8e","target":"graph","created_at":"2026-05-18T01:19:25Z","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":"Detection of the cosmological neutral hydrogen signal from the Epoch of Reionization, and estimation of its basic physical parameters, is the principal scientific aim of many current low-frequency radio telescopes. Here we describe the Cosmological HI Power Spectrum Estimator (CHIPS), an algorithm developed and implemented with data from the Murchison Widefield Array (MWA), to compute the two-dimensional and spherically-averaged power spectrum of brightness temperature fluctuations. The principal motivations for CHIPS are the application of realistic instrumental and foreground models to form ","authors_text":"A. de Oliveira-Costa, A. Ewall-Wice, A. Loeb, A. P. Beardsley, A. R. Neben, A. R. Offringa, A. Williams, Bart Pindor, Benjamin McKinley, B. J. Hazelton, Cathryn M. Trott, C. J. Lonsdale, C. L. Williams, C. Wu, Daniel A. Mitchell, Daniel C. Jacobs, D. L. Kaplan, D. Oberoi, E. Lenc, E. Morgan, F. Briggs, G. Bernardi, HS Kim, I. S. Sullivan, J. C. Pober, J. Line, J. N. Hewitt, Joshua S. Dillon, J. Riding, J. S. B. Wyithe, Judd D. Bowman, K. S. Srivani, L. Feng, L. J. Greenhill, M. F. Morales, M. Johnston-Hollitt, M. Tegmark, N. Barry, N. Hurley-Walker, Nithyanandan Thyagarajan, N. Udaya Shankar, P. Carroll, Pietro Procopio, Randall B. Wayth, R. J. Cappallo, R. L. Webster, R. Subrahmanyan, Shiv K. Sethi, S. M. Ord, S. Paul, Steven J. Tingay, T. Prabu","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-09T04:30:54Z","title":"CHIPS: The Cosmological HI Power Spectrum Estimator"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1601.02073","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":"sha256:452b7e73508d90a2bc57634a7f8c00cc52916f8e113823e038301b6ac4d5ecc7","target":"record","created_at":"2026-05-18T01:19:25Z","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":"a24e9f9e8a8b60006af5b5f84a9abeaee742d61af4ff82ccadbd6af8492a79cb","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-01-09T04:30:54Z","title_canon_sha256":"9013f77f9b590be933177588c07b3b15fc63b5b091a32adb6c6dbf558a24d4a6"},"schema_version":"1.0","source":{"id":"1601.02073","kind":"arxiv","version":1}},"canonical_sha256":"014c333351c99d4ec40ef60a754ed71d3a944adab18fb510e6b994c06928248f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"014c333351c99d4ec40ef60a754ed71d3a944adab18fb510e6b994c06928248f","first_computed_at":"2026-05-18T01:19:25.181093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:19:25.181093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q4QHGv4jeaMeXote5VQIxLz5DqlA/vbTPvmfOOG4MJtCuvpy1g8iuuoNl6m1RmthVYGCW+l3igAjilsT9FgTAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:19:25.181914Z","signed_message":"canonical_sha256_bytes"},"source_id":"1601.02073","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:452b7e73508d90a2bc57634a7f8c00cc52916f8e113823e038301b6ac4d5ecc7","sha256:9caa1301100b1173b255332cbbc480032c001d4d578a8eeeb405f0b431037d8e"],"state_sha256":"4c3332df6184c14a6a2c2b1d7ec5329ab7001044bba890af4b5e3aed23b24860"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6Pj95wYjytc0uafub5GkYQVN2d9KrcZ+Iga7zksarLwwSEfnqsrOtGbKLFJ3b8dNlwwy5i2lwwfyNZpYanCSCw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T18:58:46.571850Z","bundle_sha256":"4692d251fc1d6d6c5da78bbf809864cc863f847a0af67324c87ea88b28d1ae11"}}