{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:FCT4WST2HZF7HULZI2IX5MBNAJ","short_pith_number":"pith:FCT4WST2","canonical_record":{"source":{"id":"1710.01101","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-10-03T11:58:44Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"25ebb5298a1574dca2733bcedb7595ddaafbe610a4996dfd341949e9f9b2f3eb","abstract_canon_sha256":"7fd9da8576919142b691c15a2b8b1089e71f3f021e25dae54b121efe51a05cc2"},"schema_version":"1.0"},"canonical_sha256":"28a7cb4a7a3e4bf3d17946917eb02d024c00f41c70fd7110634d091388cf4985","source":{"kind":"arxiv","id":"1710.01101","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.01101","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"arxiv_version","alias_value":"1710.01101v1","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.01101","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"pith_short_12","alias_value":"FCT4WST2HZF7","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"FCT4WST2HZF7HULZ","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"FCT4WST2","created_at":"2026-05-18T12:31:15Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:FCT4WST2HZF7HULZI2IX5MBNAJ","target":"record","payload":{"canonical_record":{"source":{"id":"1710.01101","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-10-03T11:58:44Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"25ebb5298a1574dca2733bcedb7595ddaafbe610a4996dfd341949e9f9b2f3eb","abstract_canon_sha256":"7fd9da8576919142b691c15a2b8b1089e71f3f021e25dae54b121efe51a05cc2"},"schema_version":"1.0"},"canonical_sha256":"28a7cb4a7a3e4bf3d17946917eb02d024c00f41c70fd7110634d091388cf4985","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:17:42.802378Z","signature_b64":"VBqoiFX+Bx96AcRuYxP6pvluYKKmLkhONRdUdxr+sVy3+84JoTKWdZTWz42KVMFEHVR+L0bd7SfDJ5B65SWaCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"28a7cb4a7a3e4bf3d17946917eb02d024c00f41c70fd7110634d091388cf4985","last_reissued_at":"2026-05-18T00:17:42.801666Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:17:42.801666Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.01101","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":"2026-05-18T00:17:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"DjnjNUao/aJPZ6vsrRO5fd/S4FhacWfsrlwMqryqU4Feuj+bUsarYtkDbf3GEZepLgzgPOpUC30x9VwjtoMGAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T11:59:52.371839Z"},"content_sha256":"53ea6a33a9ea3463353129850d94fca4f988c9cb85aee7964c0ae900f01aa19c","schema_version":"1.0","event_id":"sha256:53ea6a33a9ea3463353129850d94fca4f988c9cb85aee7964c0ae900f01aa19c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:FCT4WST2HZF7HULZI2IX5MBNAJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"SARAS 2: A Spectral Radiometer for probing Cosmic Dawn and the Epoch of Reionization through detection of the global 21 cm signal","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.IM","authors_text":"A. Raghunathan, B.S. Girish, K.S. Srivani, Mayuri Sathyanarayana Rao, N. Udaya Shankar, Ravi Subrahmanyan, R. Somashekar, Saurabh Singh","submitted_at":"2017-10-03T11:58:44Z","abstract_excerpt":"The global 21 cm signal from Cosmic Dawn (CD) and the Epoch of Reionization (EoR), at redshifts $z \\sim 6-30$, probes the nature of first sources of radiation as well as physics of the Inter-Galactic Medium (IGM). Given that the signal is predicted to be extremely weak, of wide fractional bandwidth, and lies in a frequency range that is dominated by Galactic and Extragalactic foregrounds as well as Radio Frequency Interference, detection of the signal is a daunting task. Critical to the experiment is the manner in which the sky signal is represented through the instrument. It is of utmost impo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.01101","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":"2026-05-18T00:17:42Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9i4XrbXB3G47pzYvhCpohg71HhWplUFrPeenqjVhs4Gbr2e+Thif7lqnu0+Z8SWdUH4/8ZxHHXCmrvQnOFxyBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-07T11:59:52.372403Z"},"content_sha256":"74788ebda0d2681c15b298a8af19b8af79ffe96ab6eba7f11f3737a0d85da12f","schema_version":"1.0","event_id":"sha256:74788ebda0d2681c15b298a8af19b8af79ffe96ab6eba7f11f3737a0d85da12f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/bundle.json","state_url":"https://pith.science/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/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":"2026-06-07T11:59:52Z","links":{"resolver":"https://pith.science/pith/FCT4WST2HZF7HULZI2IX5MBNAJ","bundle":"https://pith.science/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/bundle.json","state":"https://pith.science/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/FCT4WST2HZF7HULZI2IX5MBNAJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:FCT4WST2HZF7HULZI2IX5MBNAJ","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":"7fd9da8576919142b691c15a2b8b1089e71f3f021e25dae54b121efe51a05cc2","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-10-03T11:58:44Z","title_canon_sha256":"25ebb5298a1574dca2733bcedb7595ddaafbe610a4996dfd341949e9f9b2f3eb"},"schema_version":"1.0","source":{"id":"1710.01101","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.01101","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"arxiv_version","alias_value":"1710.01101v1","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.01101","created_at":"2026-05-18T00:17:42Z"},{"alias_kind":"pith_short_12","alias_value":"FCT4WST2HZF7","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_16","alias_value":"FCT4WST2HZF7HULZ","created_at":"2026-05-18T12:31:15Z"},{"alias_kind":"pith_short_8","alias_value":"FCT4WST2","created_at":"2026-05-18T12:31:15Z"}],"graph_snapshots":[{"event_id":"sha256:74788ebda0d2681c15b298a8af19b8af79ffe96ab6eba7f11f3737a0d85da12f","target":"graph","created_at":"2026-05-18T00:17:42Z","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":"The global 21 cm signal from Cosmic Dawn (CD) and the Epoch of Reionization (EoR), at redshifts $z \\sim 6-30$, probes the nature of first sources of radiation as well as physics of the Inter-Galactic Medium (IGM). Given that the signal is predicted to be extremely weak, of wide fractional bandwidth, and lies in a frequency range that is dominated by Galactic and Extragalactic foregrounds as well as Radio Frequency Interference, detection of the signal is a daunting task. Critical to the experiment is the manner in which the sky signal is represented through the instrument. It is of utmost impo","authors_text":"A. Raghunathan, B.S. Girish, K.S. Srivani, Mayuri Sathyanarayana Rao, N. Udaya Shankar, Ravi Subrahmanyan, R. Somashekar, Saurabh Singh","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-10-03T11:58:44Z","title":"SARAS 2: A Spectral Radiometer for probing Cosmic Dawn and the Epoch of Reionization through detection of the global 21 cm signal"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.01101","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":"sha256:53ea6a33a9ea3463353129850d94fca4f988c9cb85aee7964c0ae900f01aa19c","target":"record","created_at":"2026-05-18T00:17:42Z","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":"7fd9da8576919142b691c15a2b8b1089e71f3f021e25dae54b121efe51a05cc2","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2017-10-03T11:58:44Z","title_canon_sha256":"25ebb5298a1574dca2733bcedb7595ddaafbe610a4996dfd341949e9f9b2f3eb"},"schema_version":"1.0","source":{"id":"1710.01101","kind":"arxiv","version":1}},"canonical_sha256":"28a7cb4a7a3e4bf3d17946917eb02d024c00f41c70fd7110634d091388cf4985","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"28a7cb4a7a3e4bf3d17946917eb02d024c00f41c70fd7110634d091388cf4985","first_computed_at":"2026-05-18T00:17:42.801666Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:17:42.801666Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VBqoiFX+Bx96AcRuYxP6pvluYKKmLkhONRdUdxr+sVy3+84JoTKWdZTWz42KVMFEHVR+L0bd7SfDJ5B65SWaCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:17:42.802378Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.01101","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:53ea6a33a9ea3463353129850d94fca4f988c9cb85aee7964c0ae900f01aa19c","sha256:74788ebda0d2681c15b298a8af19b8af79ffe96ab6eba7f11f3737a0d85da12f"],"state_sha256":"45423972b3432a83912204a2e5c6c65dda48961501bbbfb9df10ecbfdcfeb92d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d/XGSlQrF4vxruQsbE2hT+6ZQlE8FCSCeQmcg/1WpRvgGQyyL/5MUlsIvLX2FgAURCpb30gKqaqXEW1qQJHADw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-07T11:59:52.375305Z","bundle_sha256":"78aaed97a3c1b10113fcd0547c75ccf06ccfac1ecb2724faff26e84e3287b4b3"}}