{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:DLXMCPYMMFSIOF3RUSP2W5QSUS","short_pith_number":"pith:DLXMCPYM","canonical_record":{"source":{"id":"1505.04711","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-18T16:35:12Z","cross_cats_sorted":[],"title_canon_sha256":"356e20a882ee70aa182dab34fb6f0a0771775f6104124fe04e622d8f8a8148cf","abstract_canon_sha256":"ae2eb1ffd9ae7ed587f9ad45f3d356676e2345e1ce46178fb23cb92c6f89501c"},"schema_version":"1.0"},"canonical_sha256":"1aeec13f0c6164871771a49fab7612a49c798aed7fadedfe6d998158b74e3051","source":{"kind":"arxiv","id":"1505.04711","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04711","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04711v1","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04711","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"pith_short_12","alias_value":"DLXMCPYMMFSI","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"DLXMCPYMMFSIOF3R","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"DLXMCPYM","created_at":"2026-05-18T12:29:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:DLXMCPYMMFSIOF3RUSP2W5QSUS","target":"record","payload":{"canonical_record":{"source":{"id":"1505.04711","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-18T16:35:12Z","cross_cats_sorted":[],"title_canon_sha256":"356e20a882ee70aa182dab34fb6f0a0771775f6104124fe04e622d8f8a8148cf","abstract_canon_sha256":"ae2eb1ffd9ae7ed587f9ad45f3d356676e2345e1ce46178fb23cb92c6f89501c"},"schema_version":"1.0"},"canonical_sha256":"1aeec13f0c6164871771a49fab7612a49c798aed7fadedfe6d998158b74e3051","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:47.374757Z","signature_b64":"bcp85AtdnpaG25rH7Ng22wQniblkQmsNx46g+JrFzkHG9oiEiJoQXaGiZ6lhjLB/RV21wYUAGIvLA9/7WaX8CA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"1aeec13f0c6164871771a49fab7612a49c798aed7fadedfe6d998158b74e3051","last_reissued_at":"2026-05-18T01:21:47.374097Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:47.374097Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1505.04711","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":"2026-05-18T01:21:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NsAQ5/CgCJxTRg9Yf+sulcUJQ0J0j2DxaA3K7324Nx+uQe5EQm4tk/vpyNZORebtB2hFfnRNVlDtGPgOFj9SCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:40:02.635048Z"},"content_sha256":"772b96af6fba52a2703c893883f6301ce79bd025b5458ca4ba6518b65059eed0","schema_version":"1.0","event_id":"sha256:772b96af6fba52a2703c893883f6301ce79bd025b5458ca4ba6518b65059eed0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:DLXMCPYMMFSIOF3RUSP2W5QSUS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Space-based Aperture Array For Ultra-Long Wavelength Radio Astronomy","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Albert-Jan Boonstra, Alle-Jan van der Veen, Frederik Belien, Marc Klein-Wolt, Mark Bentum, Michel Arts, Noah Saks, Raj Thilak Rajan","submitted_at":"2015-05-18T16:35:12Z","abstract_excerpt":"The past decade has seen the rise of various radio astronomy arrays, particularly for low-frequency observations below 100MHz. These developments have been primarily driven by interesting and fundamental scientific questions, such as studying the dark ages and epoch of re-ionization, by detecting the highly red-shifted 21cm line emission. However, Earth-based radio astronomy below frequencies of 30MHz is severely restricted due to man-made interference, ionospheric distortion and almost complete non-transparency of the ionosphere below 10MHz. Therefore, this narrow spectral band remains possib"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04711","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":"2026-05-18T01:21:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"55QMaxNllUDQuAapao4R732b2V5EucT6beTinm48GxVH0mgpghTmc6IjJS6GlrJrVdcSQzStDkK09rZ4FLaLCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-22T12:40:02.635459Z"},"content_sha256":"2486a90753422e133759a69bbb048d381e30dd055a07f22a6a9428390abfea1d","schema_version":"1.0","event_id":"sha256:2486a90753422e133759a69bbb048d381e30dd055a07f22a6a9428390abfea1d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/bundle.json","state_url":"https://pith.science/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/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":"2026-05-22T12:40:02Z","links":{"resolver":"https://pith.science/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS","bundle":"https://pith.science/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/bundle.json","state":"https://pith.science/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/DLXMCPYMMFSIOF3RUSP2W5QSUS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:DLXMCPYMMFSIOF3RUSP2W5QSUS","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":"ae2eb1ffd9ae7ed587f9ad45f3d356676e2345e1ce46178fb23cb92c6f89501c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-18T16:35:12Z","title_canon_sha256":"356e20a882ee70aa182dab34fb6f0a0771775f6104124fe04e622d8f8a8148cf"},"schema_version":"1.0","source":{"id":"1505.04711","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1505.04711","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"arxiv_version","alias_value":"1505.04711v1","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1505.04711","created_at":"2026-05-18T01:21:47Z"},{"alias_kind":"pith_short_12","alias_value":"DLXMCPYMMFSI","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_16","alias_value":"DLXMCPYMMFSIOF3R","created_at":"2026-05-18T12:29:17Z"},{"alias_kind":"pith_short_8","alias_value":"DLXMCPYM","created_at":"2026-05-18T12:29:17Z"}],"graph_snapshots":[{"event_id":"sha256:2486a90753422e133759a69bbb048d381e30dd055a07f22a6a9428390abfea1d","target":"graph","created_at":"2026-05-18T01:21:47Z","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 past decade has seen the rise of various radio astronomy arrays, particularly for low-frequency observations below 100MHz. These developments have been primarily driven by interesting and fundamental scientific questions, such as studying the dark ages and epoch of re-ionization, by detecting the highly red-shifted 21cm line emission. However, Earth-based radio astronomy below frequencies of 30MHz is severely restricted due to man-made interference, ionospheric distortion and almost complete non-transparency of the ionosphere below 10MHz. Therefore, this narrow spectral band remains possib","authors_text":"Albert-Jan Boonstra, Alle-Jan van der Veen, Frederik Belien, Marc Klein-Wolt, Mark Bentum, Michel Arts, Noah Saks, Raj Thilak Rajan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-18T16:35:12Z","title":"Space-based Aperture Array For Ultra-Long Wavelength Radio Astronomy"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1505.04711","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":"sha256:772b96af6fba52a2703c893883f6301ce79bd025b5458ca4ba6518b65059eed0","target":"record","created_at":"2026-05-18T01:21:47Z","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":"ae2eb1ffd9ae7ed587f9ad45f3d356676e2345e1ce46178fb23cb92c6f89501c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-05-18T16:35:12Z","title_canon_sha256":"356e20a882ee70aa182dab34fb6f0a0771775f6104124fe04e622d8f8a8148cf"},"schema_version":"1.0","source":{"id":"1505.04711","kind":"arxiv","version":1}},"canonical_sha256":"1aeec13f0c6164871771a49fab7612a49c798aed7fadedfe6d998158b74e3051","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"1aeec13f0c6164871771a49fab7612a49c798aed7fadedfe6d998158b74e3051","first_computed_at":"2026-05-18T01:21:47.374097Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:21:47.374097Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"bcp85AtdnpaG25rH7Ng22wQniblkQmsNx46g+JrFzkHG9oiEiJoQXaGiZ6lhjLB/RV21wYUAGIvLA9/7WaX8CA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:21:47.374757Z","signed_message":"canonical_sha256_bytes"},"source_id":"1505.04711","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:772b96af6fba52a2703c893883f6301ce79bd025b5458ca4ba6518b65059eed0","sha256:2486a90753422e133759a69bbb048d381e30dd055a07f22a6a9428390abfea1d"],"state_sha256":"b6885c644c7be85ba526ce97c176103c3b7d293095dbe258dea21d79331fc8d8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PSNd+MD6pD8vVoLldc1fnkDEFjAE2Gd4MOewZsV4J+VHZtOK1XavxI4auv2pDnTEVJpYsgVKJa47860FVAYzBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-22T12:40:02.638191Z","bundle_sha256":"4fbdfcc59878e847915aa2145d246dcf37f43f0de55828f57e003b658a092b22"}}