{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:CDCXGZIPSDRUZDJNL5GBPOXFXC","short_pith_number":"pith:CDCXGZIP","canonical_record":{"source":{"id":"1108.3374","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-08-17T01:33:58Z","cross_cats_sorted":[],"title_canon_sha256":"184429aff688d695bf06fe6a4e12f1a3bc26c21d9a22e1a8e6093f9e95940fdb","abstract_canon_sha256":"239a7a9eb2dffc543c46d4acacf181b651d509d12de2b2137381287545712196"},"schema_version":"1.0"},"canonical_sha256":"10c573650f90e34c8d2d5f4c17bae5b8a2999a143ab36f2186348f3fb2c4c201","source":{"kind":"arxiv","id":"1108.3374","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.3374","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"arxiv_version","alias_value":"1108.3374v2","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.3374","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"pith_short_12","alias_value":"CDCXGZIPSDRU","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"CDCXGZIPSDRUZDJN","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"CDCXGZIP","created_at":"2026-05-18T12:26:26Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:CDCXGZIPSDRUZDJNL5GBPOXFXC","target":"record","payload":{"canonical_record":{"source":{"id":"1108.3374","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-08-17T01:33:58Z","cross_cats_sorted":[],"title_canon_sha256":"184429aff688d695bf06fe6a4e12f1a3bc26c21d9a22e1a8e6093f9e95940fdb","abstract_canon_sha256":"239a7a9eb2dffc543c46d4acacf181b651d509d12de2b2137381287545712196"},"schema_version":"1.0"},"canonical_sha256":"10c573650f90e34c8d2d5f4c17bae5b8a2999a143ab36f2186348f3fb2c4c201","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:53.026873Z","signature_b64":"iF2bSBErhLpTBybPxTBv48Okpgbbc+FFaO57cOeO33aKt0ZsLo4kiiEyPrh908pIWAr5iujO9+jKzwD7gCzPBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"10c573650f90e34c8d2d5f4c17bae5b8a2999a143ab36f2186348f3fb2c4c201","last_reissued_at":"2026-05-18T02:00:53.026196Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:53.026196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.3374","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":"2026-05-18T02:00:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pp3LD3vGFoJ/p3/jX01PcSBxmE0svMT6uR7ZC+bA0kvIlZbYP1k+rUZalxKjOyuunP0jUFzdma98rXjAE5avCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T23:46:02.010224Z"},"content_sha256":"46238090c3a0363c0990d435683acfa77a2997fd0de4fe65efb69edf01084a60","schema_version":"1.0","event_id":"sha256:46238090c3a0363c0990d435683acfa77a2997fd0de4fe65efb69edf01084a60"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:CDCXGZIPSDRUZDJNL5GBPOXFXC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A brief history of the search for extraterrestrial intelligence and an appraisal of the future of this endeavor","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"Berkeley), Stuart Bowyer (Space Sciences Laboratory, University of California","submitted_at":"2011-08-17T01:33:58Z","abstract_excerpt":"The idea that credible searches for Extra-Terrestrial Intelligence (ETI) could be carried out were laid out in detail in the (now classic) paper by Morrison and Cocconi (1959). They suggested using the radio band for these searches. Since then radio searches have been carried out by over sixty different groups. No signals from ETI's have been identified. Most searches did not have high sensitivity and it is not surprising that ETI signals were not detected. It is important to note, however, that these efforts were instrumental in developing new technical capabilities and they helped generate w"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.3374","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":"2026-05-18T02:00:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1N5Fyh9oBvy+JctTrkAhAV7+zzgjNwTZzR4EwFr4m109jD5sqoL/YgVNXPnmYCq39x08SJyMxnaXlX3rELGXBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-29T23:46:02.010601Z"},"content_sha256":"a8aa556d5ff81850d2181ee996f95210d46b5452b4c91cd1ecb5d9300fd97ee1","schema_version":"1.0","event_id":"sha256:a8aa556d5ff81850d2181ee996f95210d46b5452b4c91cd1ecb5d9300fd97ee1"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/bundle.json","state_url":"https://pith.science/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/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":"2026-05-29T23:46:02Z","links":{"resolver":"https://pith.science/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC","bundle":"https://pith.science/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/bundle.json","state":"https://pith.science/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/CDCXGZIPSDRUZDJNL5GBPOXFXC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:CDCXGZIPSDRUZDJNL5GBPOXFXC","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":"239a7a9eb2dffc543c46d4acacf181b651d509d12de2b2137381287545712196","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-08-17T01:33:58Z","title_canon_sha256":"184429aff688d695bf06fe6a4e12f1a3bc26c21d9a22e1a8e6093f9e95940fdb"},"schema_version":"1.0","source":{"id":"1108.3374","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.3374","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"arxiv_version","alias_value":"1108.3374v2","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.3374","created_at":"2026-05-18T02:00:53Z"},{"alias_kind":"pith_short_12","alias_value":"CDCXGZIPSDRU","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_16","alias_value":"CDCXGZIPSDRUZDJN","created_at":"2026-05-18T12:26:26Z"},{"alias_kind":"pith_short_8","alias_value":"CDCXGZIP","created_at":"2026-05-18T12:26:26Z"}],"graph_snapshots":[{"event_id":"sha256:a8aa556d5ff81850d2181ee996f95210d46b5452b4c91cd1ecb5d9300fd97ee1","target":"graph","created_at":"2026-05-18T02:00:53Z","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 idea that credible searches for Extra-Terrestrial Intelligence (ETI) could be carried out were laid out in detail in the (now classic) paper by Morrison and Cocconi (1959). They suggested using the radio band for these searches. Since then radio searches have been carried out by over sixty different groups. No signals from ETI's have been identified. Most searches did not have high sensitivity and it is not surprising that ETI signals were not detected. It is important to note, however, that these efforts were instrumental in developing new technical capabilities and they helped generate w","authors_text":"Berkeley), Stuart Bowyer (Space Sciences Laboratory, University of California","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-08-17T01:33:58Z","title":"A brief history of the search for extraterrestrial intelligence and an appraisal of the future of this endeavor"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.3374","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":"sha256:46238090c3a0363c0990d435683acfa77a2997fd0de4fe65efb69edf01084a60","target":"record","created_at":"2026-05-18T02:00:53Z","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":"239a7a9eb2dffc543c46d4acacf181b651d509d12de2b2137381287545712196","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2011-08-17T01:33:58Z","title_canon_sha256":"184429aff688d695bf06fe6a4e12f1a3bc26c21d9a22e1a8e6093f9e95940fdb"},"schema_version":"1.0","source":{"id":"1108.3374","kind":"arxiv","version":2}},"canonical_sha256":"10c573650f90e34c8d2d5f4c17bae5b8a2999a143ab36f2186348f3fb2c4c201","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"10c573650f90e34c8d2d5f4c17bae5b8a2999a143ab36f2186348f3fb2c4c201","first_computed_at":"2026-05-18T02:00:53.026196Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:53.026196Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"iF2bSBErhLpTBybPxTBv48Okpgbbc+FFaO57cOeO33aKt0ZsLo4kiiEyPrh908pIWAr5iujO9+jKzwD7gCzPBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:53.026873Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.3374","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:46238090c3a0363c0990d435683acfa77a2997fd0de4fe65efb69edf01084a60","sha256:a8aa556d5ff81850d2181ee996f95210d46b5452b4c91cd1ecb5d9300fd97ee1"],"state_sha256":"67a47554cd516ac3228a6f6f73a9eebcf35a8637ab751957b1f70c9438945be6"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ws2zk240q0cScglJRHLRdYYz9QpThntzw0NrocFaR9lyGBBMi5J5weJxRdwOmOFHQNom1uqVAXHhZLS7U9XiDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-29T23:46:02.013328Z","bundle_sha256":"e967a4d3b856e59f4748ccac5aced940915d1257fd996905c3c9594e51be7e60"}}