{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:5X5ZW76WDBCUQLXRF4BAJ2DJ67","short_pith_number":"pith:5X5ZW76W","canonical_record":{"source":{"id":"1602.02635","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-08T16:28:38Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"1cda80f336d88ede58a0270b44e0a140bf35d80dad3524b0109c867d1aea3c4e","abstract_canon_sha256":"79cbcf07cc3fe0055ecc8475515b295a0a34356c00c697014b01dc0341985078"},"schema_version":"1.0"},"canonical_sha256":"edfb9b7fd61845482ef12f0204e869f7feb3680a3224d7b995f0a6533f57625a","source":{"kind":"arxiv","id":"1602.02635","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02635","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02635v2","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02635","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"pith_short_12","alias_value":"5X5ZW76WDBCU","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5X5ZW76WDBCUQLXR","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5X5ZW76W","created_at":"2026-05-18T12:30:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:5X5ZW76WDBCUQLXRF4BAJ2DJ67","target":"record","payload":{"canonical_record":{"source":{"id":"1602.02635","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-08T16:28:38Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"1cda80f336d88ede58a0270b44e0a140bf35d80dad3524b0109c867d1aea3c4e","abstract_canon_sha256":"79cbcf07cc3fe0055ecc8475515b295a0a34356c00c697014b01dc0341985078"},"schema_version":"1.0"},"canonical_sha256":"edfb9b7fd61845482ef12f0204e869f7feb3680a3224d7b995f0a6533f57625a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:15.390307Z","signature_b64":"QB67+IjXipHxMH8PNMniWEtOyfRnGzfhJn5q4noArPgP8dkfbc8rrrRiap/LcijI77yjEqWmqRvTm4mu9SErCA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"edfb9b7fd61845482ef12f0204e869f7feb3680a3224d7b995f0a6533f57625a","last_reissued_at":"2026-05-18T01:13:15.389719Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:15.389719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.02635","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":"2026-05-18T01:13:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"qJrhILcwKoeSeTZyWMLzOJ/7mb/BXov3+jxUx/LG3jPxM5tQMNp+SRZvYgI92jO8bInr2ndWSmb067MBSqu7DA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:04:30.893820Z"},"content_sha256":"05f014ed678693998735309bf36a704ff6eea2ddee5c32d34cc5bf24a3b43c46","schema_version":"1.0","event_id":"sha256:05f014ed678693998735309bf36a704ff6eea2ddee5c32d34cc5bf24a3b43c46"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:5X5ZW76WDBCUQLXRF4BAJ2DJ67","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Constraining Polarized Foregrounds for EoR Experiments I: 2D Power Spectra from the PAPER-32 Imaging Array","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Parsons, C. Carilli, C. Nunhokee, D. DeBoer, D. Jacobs, D. MacMahon, D. Moore, G. Bernardi, I. Stefan, J. Aguirre, J. Manley, J. Pober, N. Gugliucci, P. Klima, R. Bradley, S. A. Kohn, W. Walbrugh, Z. Ali","submitted_at":"2016-02-08T16:28:38Z","abstract_excerpt":"Current-generation low frequency interferometers constructed with the objective of detecting the high-redshift 21 cm background, aim to generate power spectra of the brightness-temperature contrast of neutral hydrogen in primordial intergalactic medium. Two-dimensional power spectra (power in Fourier modes parallel and perpendicular to the line of sight) formed from interferometric visibilities have been shown to delineate a boundary between spectrally-smooth foregrounds (known as the wedge) and spectrally-structured 21 cm background emission (the EoR-window). However, polarized foregrounds ar"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02635","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":"2026-05-18T01:13:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rinNx5aBWWfAuvc5rJ3m/UB2f1905TxgPOydMqD+ajIGbpds8+LYzNYcLVFk3y4tu+IBZnM3H+aAc466ts4mBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T16:04:30.894298Z"},"content_sha256":"61e91ebc09bb7b1b9999755db289e24829ca1dcf1e0755fdd917d70038f86d74","schema_version":"1.0","event_id":"sha256:61e91ebc09bb7b1b9999755db289e24829ca1dcf1e0755fdd917d70038f86d74"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/bundle.json","state_url":"https://pith.science/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/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":"2026-05-26T16:04:30Z","links":{"resolver":"https://pith.science/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67","bundle":"https://pith.science/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/bundle.json","state":"https://pith.science/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/state.json","well_known_bundle":"https://pith.science/.well-known/pith/5X5ZW76WDBCUQLXRF4BAJ2DJ67/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:5X5ZW76WDBCUQLXRF4BAJ2DJ67","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":"79cbcf07cc3fe0055ecc8475515b295a0a34356c00c697014b01dc0341985078","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-08T16:28:38Z","title_canon_sha256":"1cda80f336d88ede58a0270b44e0a140bf35d80dad3524b0109c867d1aea3c4e"},"schema_version":"1.0","source":{"id":"1602.02635","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.02635","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"arxiv_version","alias_value":"1602.02635v2","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.02635","created_at":"2026-05-18T01:13:15Z"},{"alias_kind":"pith_short_12","alias_value":"5X5ZW76WDBCU","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_16","alias_value":"5X5ZW76WDBCUQLXR","created_at":"2026-05-18T12:30:01Z"},{"alias_kind":"pith_short_8","alias_value":"5X5ZW76W","created_at":"2026-05-18T12:30:01Z"}],"graph_snapshots":[{"event_id":"sha256:61e91ebc09bb7b1b9999755db289e24829ca1dcf1e0755fdd917d70038f86d74","target":"graph","created_at":"2026-05-18T01:13:15Z","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":"Current-generation low frequency interferometers constructed with the objective of detecting the high-redshift 21 cm background, aim to generate power spectra of the brightness-temperature contrast of neutral hydrogen in primordial intergalactic medium. Two-dimensional power spectra (power in Fourier modes parallel and perpendicular to the line of sight) formed from interferometric visibilities have been shown to delineate a boundary between spectrally-smooth foregrounds (known as the wedge) and spectrally-structured 21 cm background emission (the EoR-window). However, polarized foregrounds ar","authors_text":"A. Parsons, C. Carilli, C. Nunhokee, D. DeBoer, D. Jacobs, D. MacMahon, D. Moore, G. Bernardi, I. Stefan, J. Aguirre, J. Manley, J. Pober, N. Gugliucci, P. Klima, R. Bradley, S. A. Kohn, W. Walbrugh, Z. Ali","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-08T16:28:38Z","title":"Constraining Polarized Foregrounds for EoR Experiments I: 2D Power Spectra from the PAPER-32 Imaging Array"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.02635","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":"sha256:05f014ed678693998735309bf36a704ff6eea2ddee5c32d34cc5bf24a3b43c46","target":"record","created_at":"2026-05-18T01:13:15Z","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":"79cbcf07cc3fe0055ecc8475515b295a0a34356c00c697014b01dc0341985078","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2016-02-08T16:28:38Z","title_canon_sha256":"1cda80f336d88ede58a0270b44e0a140bf35d80dad3524b0109c867d1aea3c4e"},"schema_version":"1.0","source":{"id":"1602.02635","kind":"arxiv","version":2}},"canonical_sha256":"edfb9b7fd61845482ef12f0204e869f7feb3680a3224d7b995f0a6533f57625a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"edfb9b7fd61845482ef12f0204e869f7feb3680a3224d7b995f0a6533f57625a","first_computed_at":"2026-05-18T01:13:15.389719Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:13:15.389719Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QB67+IjXipHxMH8PNMniWEtOyfRnGzfhJn5q4noArPgP8dkfbc8rrrRiap/LcijI77yjEqWmqRvTm4mu9SErCA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:13:15.390307Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.02635","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:05f014ed678693998735309bf36a704ff6eea2ddee5c32d34cc5bf24a3b43c46","sha256:61e91ebc09bb7b1b9999755db289e24829ca1dcf1e0755fdd917d70038f86d74"],"state_sha256":"f263b38ef99d8e58aa28fa9e1030d37e10e323de00478f7d3d2f44dd0b145458"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GdB27bRcO23zQZ4KiFmJpRWz+KxcOFVcHsGTAeqYDxY0kX3GFIwMl38BtzCR9x4j+cC7yn1jfCBos5k0MUacAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T16:04:30.898180Z","bundle_sha256":"21c339414410d26d1d7fb4a65b131bf8da76beb237d31ab4e5b098bf032d948c"}}