{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:IVM2MXSMNXIYJUFP47R2WYEEZN","short_pith_number":"pith:IVM2MXSM","canonical_record":{"source":{"id":"1903.10531","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-03-25T18:03:19Z","cross_cats_sorted":[],"title_canon_sha256":"30fa5d1ea557cc66424ccc393201277f98912d71a6a8be45b6a92c148024dc5a","abstract_canon_sha256":"a332723f9ef04673ed263a1e1ca4d78d1edfab9ec81bec25ba86010898d8261a"},"schema_version":"1.0"},"canonical_sha256":"4559a65e4c6dd184d0afe7e3ab6084cb7b3f4b813d594f52b889f5ec9b8133de","source":{"kind":"arxiv","id":"1903.10531","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.10531","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"arxiv_version","alias_value":"1903.10531v1","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.10531","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"pith_short_12","alias_value":"IVM2MXSMNXIY","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IVM2MXSMNXIYJUFP","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IVM2MXSM","created_at":"2026-05-18T12:33:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:IVM2MXSMNXIYJUFP47R2WYEEZN","target":"record","payload":{"canonical_record":{"source":{"id":"1903.10531","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-03-25T18:03:19Z","cross_cats_sorted":[],"title_canon_sha256":"30fa5d1ea557cc66424ccc393201277f98912d71a6a8be45b6a92c148024dc5a","abstract_canon_sha256":"a332723f9ef04673ed263a1e1ca4d78d1edfab9ec81bec25ba86010898d8261a"},"schema_version":"1.0"},"canonical_sha256":"4559a65e4c6dd184d0afe7e3ab6084cb7b3f4b813d594f52b889f5ec9b8133de","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:43:02.841471Z","signature_b64":"3TRxKqdy9SHYnlgyGDKuQ5KEryLK6HTOX4/X6FY9kMeGA+kVkcyxSJaUsLEDhB47bpw16Fk1MB1CamuaZ3t/BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4559a65e4c6dd184d0afe7e3ab6084cb7b3f4b813d594f52b889f5ec9b8133de","last_reissued_at":"2026-05-17T23:43:02.840966Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:43:02.840966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.10531","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":"2026-05-17T23:43:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YR9bMS+gifmNuYSWHSSMPba2hPpTtk4hco3tuOAuw1A00TuPY04GWhH/UQoGpeEeyzu3a71Y158wX9krehoGCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T03:01:30.643294Z"},"content_sha256":"6a2354c18f7057ac01f15655fd3e02c02ddaacb1b598d56f62b7df72a8983f99","schema_version":"1.0","event_id":"sha256:6a2354c18f7057ac01f15655fd3e02c02ddaacb1b598d56f62b7df72a8983f99"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:IVM2MXSMNXIYJUFP47R2WYEEZN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Fundamental uncertainty levels of 21cm power spectra from a delay analysis","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Adam E. Lanman, Jonathan C. Pober","submitted_at":"2019-03-25T18:03:19Z","abstract_excerpt":"Several experimental efforts are underway to measure the power spectrum of 21cm fluctuations from the Epoch of Reionization (EoR) using low-frequency radio interferometers. Experiments like the Hydrogen Epoch of Reionization Array (HERA) and Murchison Widefield Array Phase II (MWA) feature highly-redundant antenna layouts, building sensitivity through redundant measurements of the same angular Fourier modes, at the expense of diminished UV coverage. This strategy limits the numbers of independent samples of each power spectrum mode, thereby increasing the effect of sample variance on the final"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.10531","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":"2026-05-17T23:43:02Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ozt5ybS9giLRxEx23uA6fXIPN+WGxnAylDV+9Axl4xSzyW5yVqDa0XrUn7BLx3vTNgv8rNpRSPY9W0D/egR7AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-23T03:01:30.644007Z"},"content_sha256":"3cd34f1110524671be3c94fa871497989e3568053d5f30d6a5d866ee8b9c235a","schema_version":"1.0","event_id":"sha256:3cd34f1110524671be3c94fa871497989e3568053d5f30d6a5d866ee8b9c235a"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/bundle.json","state_url":"https://pith.science/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/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":"2026-05-23T03:01:30Z","links":{"resolver":"https://pith.science/pith/IVM2MXSMNXIYJUFP47R2WYEEZN","bundle":"https://pith.science/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/bundle.json","state":"https://pith.science/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IVM2MXSMNXIYJUFP47R2WYEEZN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:IVM2MXSMNXIYJUFP47R2WYEEZN","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":"a332723f9ef04673ed263a1e1ca4d78d1edfab9ec81bec25ba86010898d8261a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-03-25T18:03:19Z","title_canon_sha256":"30fa5d1ea557cc66424ccc393201277f98912d71a6a8be45b6a92c148024dc5a"},"schema_version":"1.0","source":{"id":"1903.10531","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.10531","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"arxiv_version","alias_value":"1903.10531v1","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.10531","created_at":"2026-05-17T23:43:02Z"},{"alias_kind":"pith_short_12","alias_value":"IVM2MXSMNXIY","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_16","alias_value":"IVM2MXSMNXIYJUFP","created_at":"2026-05-18T12:33:18Z"},{"alias_kind":"pith_short_8","alias_value":"IVM2MXSM","created_at":"2026-05-18T12:33:18Z"}],"graph_snapshots":[{"event_id":"sha256:3cd34f1110524671be3c94fa871497989e3568053d5f30d6a5d866ee8b9c235a","target":"graph","created_at":"2026-05-17T23:43:02Z","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":"Several experimental efforts are underway to measure the power spectrum of 21cm fluctuations from the Epoch of Reionization (EoR) using low-frequency radio interferometers. Experiments like the Hydrogen Epoch of Reionization Array (HERA) and Murchison Widefield Array Phase II (MWA) feature highly-redundant antenna layouts, building sensitivity through redundant measurements of the same angular Fourier modes, at the expense of diminished UV coverage. This strategy limits the numbers of independent samples of each power spectrum mode, thereby increasing the effect of sample variance on the final","authors_text":"Adam E. Lanman, Jonathan C. Pober","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-03-25T18:03:19Z","title":"Fundamental uncertainty levels of 21cm power spectra from a delay analysis"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.10531","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":"sha256:6a2354c18f7057ac01f15655fd3e02c02ddaacb1b598d56f62b7df72a8983f99","target":"record","created_at":"2026-05-17T23:43:02Z","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":"a332723f9ef04673ed263a1e1ca4d78d1edfab9ec81bec25ba86010898d8261a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-03-25T18:03:19Z","title_canon_sha256":"30fa5d1ea557cc66424ccc393201277f98912d71a6a8be45b6a92c148024dc5a"},"schema_version":"1.0","source":{"id":"1903.10531","kind":"arxiv","version":1}},"canonical_sha256":"4559a65e4c6dd184d0afe7e3ab6084cb7b3f4b813d594f52b889f5ec9b8133de","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4559a65e4c6dd184d0afe7e3ab6084cb7b3f4b813d594f52b889f5ec9b8133de","first_computed_at":"2026-05-17T23:43:02.840966Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:43:02.840966Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3TRxKqdy9SHYnlgyGDKuQ5KEryLK6HTOX4/X6FY9kMeGA+kVkcyxSJaUsLEDhB47bpw16Fk1MB1CamuaZ3t/BQ==","signature_status":"signed_v1","signed_at":"2026-05-17T23:43:02.841471Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.10531","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a2354c18f7057ac01f15655fd3e02c02ddaacb1b598d56f62b7df72a8983f99","sha256:3cd34f1110524671be3c94fa871497989e3568053d5f30d6a5d866ee8b9c235a"],"state_sha256":"fa3b9a123d35376685108659b74fe0307a2c8332233ceb05a713cd850e3fab1a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FuuDzfzQxi7vifTtgG/BPZ753fkeI3XzmkNqpsP/vGMxEOQjIURU/KOij9Ice0h6AtdDH2gURdEVOln028vhAg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-23T03:01:30.647835Z","bundle_sha256":"2fcdffecdf5e4369a77fe64c39e65f2e473fee725fdd4c5d2e3ffc70f7151570"}}