{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:T5DUHY2G372J3YXXQA6VIC2VXZ","short_pith_number":"pith:T5DUHY2G","canonical_record":{"source":{"id":"1909.12491","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-27T04:37:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"bcbfeeb58e714f0c1bc1b74eb75af7161bd53cb5f8979d03ec86dfe7b28d5e0d","abstract_canon_sha256":"6267ddde7f0e4b32237a459edee638546e11405a4ed138ce9163d1997f3c2e13"},"schema_version":"1.0"},"canonical_sha256":"9f4743e346dff49de2f7803d540b55be610283d8b7f814b62218fdba69f407c3","source":{"kind":"arxiv","id":"1909.12491","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.12491","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"arxiv_version","alias_value":"1909.12491v1","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.12491","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_12","alias_value":"T5DUHY2G372J","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_16","alias_value":"T5DUHY2G372J3YXX","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_8","alias_value":"T5DUHY2G","created_at":"2026-07-05T00:07:40Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:T5DUHY2G372J3YXXQA6VIC2VXZ","target":"record","payload":{"canonical_record":{"source":{"id":"1909.12491","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-27T04:37:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"bcbfeeb58e714f0c1bc1b74eb75af7161bd53cb5f8979d03ec86dfe7b28d5e0d","abstract_canon_sha256":"6267ddde7f0e4b32237a459edee638546e11405a4ed138ce9163d1997f3c2e13"},"schema_version":"1.0"},"canonical_sha256":"9f4743e346dff49de2f7803d540b55be610283d8b7f814b62218fdba69f407c3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T00:07:40.277380Z","signature_b64":"6YKQhQup8Z2RtzEMAJR7hE1W2JfNmMPuGCJKnwN1g7HZBEFA7XyL+FkS8GnjUwQGfb+n0syKNJa5ZP4APNvABA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9f4743e346dff49de2f7803d540b55be610283d8b7f814b62218fdba69f407c3","last_reissued_at":"2026-07-05T00:07:40.276990Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T00:07:40.276990Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1909.12491","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":"2026-07-05T00:07:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SJoMJHbSuxrNBRPXQRsC1cE78G4eNh+wdrxAI6E1SfjYmbHWW03Qn8T+McivYJUqdjEEuDsgjoyS31eZ1H0RBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T02:03:03.186687Z"},"content_sha256":"88cf9e9156d0c4d73ccd6c77bf1fc7081877e6c0b2f3d2fb2ed10367b0cdb1b5","schema_version":"1.0","event_id":"sha256:88cf9e9156d0c4d73ccd6c77bf1fc7081877e6c0b2f3d2fb2ed10367b0cdb1b5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:T5DUHY2G372J3YXXQA6VIC2VXZ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The status of 21cm interferometric experiments","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"Cathryn M. Trott, Jonathan C. Pober","submitted_at":"2019-09-27T04:37:07Z","abstract_excerpt":"Interferometric experiments of the reionization era offer the advantages of measuring power in spatial modes with increased sensitivity afforded by multiple independent sky measurements. Here we review early work to measure this signal, current experiments, and future opportunities, highlighting the lessons learned along the way that have shaped the research field and experimental design. In particular, this chapter discusses the history, progress, challenges and forecasts for detection and exploration of the spatial structure of the 21~cm brightness temperature signal in the Epoch of Reionisa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.12491","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1909.12491/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-05T00:07:40Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xxKraMC5yMAPMYOR3PCH8wQpuYw68GuppiPYv24kN2RBD9JnEg7JN9FYlaSy1B0PPWJgOUz3XE7G1T11S3lQAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-16T02:03:03.187995Z"},"content_sha256":"fa5eebd556393c076e11ccacac0fce18f92463b840547a03d383485e2ababd43","schema_version":"1.0","event_id":"sha256:fa5eebd556393c076e11ccacac0fce18f92463b840547a03d383485e2ababd43"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/bundle.json","state_url":"https://pith.science/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/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":"2026-08-16T02:03:03Z","links":{"resolver":"https://pith.science/pith/T5DUHY2G372J3YXXQA6VIC2VXZ","bundle":"https://pith.science/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/bundle.json","state":"https://pith.science/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/T5DUHY2G372J3YXXQA6VIC2VXZ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:T5DUHY2G372J3YXXQA6VIC2VXZ","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":"6267ddde7f0e4b32237a459edee638546e11405a4ed138ce9163d1997f3c2e13","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-27T04:37:07Z","title_canon_sha256":"bcbfeeb58e714f0c1bc1b74eb75af7161bd53cb5f8979d03ec86dfe7b28d5e0d"},"schema_version":"1.0","source":{"id":"1909.12491","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.12491","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"arxiv_version","alias_value":"1909.12491v1","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.12491","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_12","alias_value":"T5DUHY2G372J","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_16","alias_value":"T5DUHY2G372J3YXX","created_at":"2026-07-05T00:07:40Z"},{"alias_kind":"pith_short_8","alias_value":"T5DUHY2G","created_at":"2026-07-05T00:07:40Z"}],"graph_snapshots":[{"event_id":"sha256:fa5eebd556393c076e11ccacac0fce18f92463b840547a03d383485e2ababd43","target":"graph","created_at":"2026-07-05T00:07:40Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1909.12491/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Interferometric experiments of the reionization era offer the advantages of measuring power in spatial modes with increased sensitivity afforded by multiple independent sky measurements. Here we review early work to measure this signal, current experiments, and future opportunities, highlighting the lessons learned along the way that have shaped the research field and experimental design. In particular, this chapter discusses the history, progress, challenges and forecasts for detection and exploration of the spatial structure of the 21~cm brightness temperature signal in the Epoch of Reionisa","authors_text":"Cathryn M. Trott, Jonathan C. Pober","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-27T04:37:07Z","title":"The status of 21cm interferometric experiments"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.12491","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":"sha256:88cf9e9156d0c4d73ccd6c77bf1fc7081877e6c0b2f3d2fb2ed10367b0cdb1b5","target":"record","created_at":"2026-07-05T00:07:40Z","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":"6267ddde7f0e4b32237a459edee638546e11405a4ed138ce9163d1997f3c2e13","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2019-09-27T04:37:07Z","title_canon_sha256":"bcbfeeb58e714f0c1bc1b74eb75af7161bd53cb5f8979d03ec86dfe7b28d5e0d"},"schema_version":"1.0","source":{"id":"1909.12491","kind":"arxiv","version":1}},"canonical_sha256":"9f4743e346dff49de2f7803d540b55be610283d8b7f814b62218fdba69f407c3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9f4743e346dff49de2f7803d540b55be610283d8b7f814b62218fdba69f407c3","first_computed_at":"2026-07-05T00:07:40.276990Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:07:40.276990Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6YKQhQup8Z2RtzEMAJR7hE1W2JfNmMPuGCJKnwN1g7HZBEFA7XyL+FkS8GnjUwQGfb+n0syKNJa5ZP4APNvABA==","signature_status":"signed_v1","signed_at":"2026-07-05T00:07:40.277380Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.12491","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:88cf9e9156d0c4d73ccd6c77bf1fc7081877e6c0b2f3d2fb2ed10367b0cdb1b5","sha256:fa5eebd556393c076e11ccacac0fce18f92463b840547a03d383485e2ababd43"],"state_sha256":"60fc2e58c523f03cc0971d4cfcdb86e432b935c6e5cd5d53b5f41059011489a8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"t5FJrVXFVVVllYuh+wm6rmfI/bYSCEi/bCVQB5pi4iBhVES4cycqkuVctdWytH++BId2BcNlgmuiCXYYv1skDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-16T02:03:03.192788Z","bundle_sha256":"230a6635788b62d183de036143647977a9d550bed2319c8d32744d0b6f2a4459"}}