{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2011:G6OQJYAIFK47EYLPISNC4H5V5Q","short_pith_number":"pith:G6OQJYAI","canonical_record":{"source":{"id":"1108.4011","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-19T17:18:32Z","cross_cats_sorted":[],"title_canon_sha256":"10666de4c197f53e99eaf9d07b8dd368aeefdbd20d2feeeb245f3de71ddcc71d","abstract_canon_sha256":"49f8c2248fffe16f15f3d8c0afbf3b3fdfc56ab272bbc82a92a5ec06d037bd69"},"schema_version":"1.0"},"canonical_sha256":"379d04e0082ab9f2616f449a2e1fb5ec276ea52c8e1743bd86c606084f8e62d9","source":{"kind":"arxiv","id":"1108.4011","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.4011","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"arxiv_version","alias_value":"1108.4011v1","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.4011","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"pith_short_12","alias_value":"G6OQJYAIFK47","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G6OQJYAIFK47EYLP","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G6OQJYAI","created_at":"2026-05-18T12:26:28Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2011:G6OQJYAIFK47EYLPISNC4H5V5Q","target":"record","payload":{"canonical_record":{"source":{"id":"1108.4011","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-19T17:18:32Z","cross_cats_sorted":[],"title_canon_sha256":"10666de4c197f53e99eaf9d07b8dd368aeefdbd20d2feeeb245f3de71ddcc71d","abstract_canon_sha256":"49f8c2248fffe16f15f3d8c0afbf3b3fdfc56ab272bbc82a92a5ec06d037bd69"},"schema_version":"1.0"},"canonical_sha256":"379d04e0082ab9f2616f449a2e1fb5ec276ea52c8e1743bd86c606084f8e62d9","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:00:50.390351Z","signature_b64":"9rP1UiPS4m3kqzIgkp7d2eiGe/xeJLoqmy5wf+GGrEEadW5Hq5i4Ud4+USlM2pbQ4ns1X91yzGGDirj9hmBZBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"379d04e0082ab9f2616f449a2e1fb5ec276ea52c8e1743bd86c606084f8e62d9","last_reissued_at":"2026-05-18T02:00:50.389742Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:00:50.389742Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1108.4011","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":"2026-05-18T02:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"XsfMs1x6u8EWECXjFTew26OIQ1dSBhimSsvxDp67rkjKSwhsIDtq+/80b69Qw9SlqLu8Ma1gfoOC6BKWK7kADg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T00:36:28.071374Z"},"content_sha256":"bb5da2e7b9b1633327a5428abafdb27dba53dddd74a67fcbd7c65c3717d94364","schema_version":"1.0","event_id":"sha256:bb5da2e7b9b1633327a5428abafdb27dba53dddd74a67fcbd7c65c3717d94364"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2011:G6OQJYAIFK47EYLPISNC4H5V5Q","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The ALFALFA HI Absorption Pilot Survey: A Wide-Area Blind Damped Lyman Alpha System Survey of the Local Universe","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"Erin P. Macdonald, Jeremy Darling, Martha P. Haynes, Riccardo Giovanelli","submitted_at":"2011-08-19T17:18:32Z","abstract_excerpt":"We present the results of a pilot survey for neutral hydrogen (HI) 21 cm absorption in the Arecibo Legacy Fast Arecibo L-Band Feed Array (ALFALFA) Survey. This project is a wide-area \"blind\" search for HI absorption in the local universe, spanning -650 km/s < cz < 17,500 km/s and covering 517.0 square degrees (7% of the full ALFALFA survey). The survey is sensitive to HI absorption lines stronger than 7.7 mJy (8983 radio sources) and is 90% complete for lines stronger than 11.0 mJy (7296 sources). The total redshift interval sensitive to all damped Lyman alpha (DLA) systems (N_HI >= 2x10^20 cm"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4011","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":"2026-05-18T02:00:50Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"W/brfEfL7O0qhYwciK6EwVgQ49GrFvFZgFdkZpB29Jp+O7JgwOSXW7//reluKdOLlI/zDDuz3PBSyk1RATrvBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T00:36:28.072081Z"},"content_sha256":"a5de2525e319f94ebedb456a3be602c62190409d827d0cbe506366f685165d1b","schema_version":"1.0","event_id":"sha256:a5de2525e319f94ebedb456a3be602c62190409d827d0cbe506366f685165d1b"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/bundle.json","state_url":"https://pith.science/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/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":"2026-05-25T00:36:28Z","links":{"resolver":"https://pith.science/pith/G6OQJYAIFK47EYLPISNC4H5V5Q","bundle":"https://pith.science/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/bundle.json","state":"https://pith.science/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/state.json","well_known_bundle":"https://pith.science/.well-known/pith/G6OQJYAIFK47EYLPISNC4H5V5Q/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2011:G6OQJYAIFK47EYLPISNC4H5V5Q","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":"49f8c2248fffe16f15f3d8c0afbf3b3fdfc56ab272bbc82a92a5ec06d037bd69","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-19T17:18:32Z","title_canon_sha256":"10666de4c197f53e99eaf9d07b8dd368aeefdbd20d2feeeb245f3de71ddcc71d"},"schema_version":"1.0","source":{"id":"1108.4011","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1108.4011","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"arxiv_version","alias_value":"1108.4011v1","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1108.4011","created_at":"2026-05-18T02:00:50Z"},{"alias_kind":"pith_short_12","alias_value":"G6OQJYAIFK47","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_16","alias_value":"G6OQJYAIFK47EYLP","created_at":"2026-05-18T12:26:28Z"},{"alias_kind":"pith_short_8","alias_value":"G6OQJYAI","created_at":"2026-05-18T12:26:28Z"}],"graph_snapshots":[{"event_id":"sha256:a5de2525e319f94ebedb456a3be602c62190409d827d0cbe506366f685165d1b","target":"graph","created_at":"2026-05-18T02:00:50Z","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":"We present the results of a pilot survey for neutral hydrogen (HI) 21 cm absorption in the Arecibo Legacy Fast Arecibo L-Band Feed Array (ALFALFA) Survey. This project is a wide-area \"blind\" search for HI absorption in the local universe, spanning -650 km/s < cz < 17,500 km/s and covering 517.0 square degrees (7% of the full ALFALFA survey). The survey is sensitive to HI absorption lines stronger than 7.7 mJy (8983 radio sources) and is 90% complete for lines stronger than 11.0 mJy (7296 sources). The total redshift interval sensitive to all damped Lyman alpha (DLA) systems (N_HI >= 2x10^20 cm","authors_text":"Erin P. Macdonald, Jeremy Darling, Martha P. Haynes, Riccardo Giovanelli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-19T17:18:32Z","title":"The ALFALFA HI Absorption Pilot Survey: A Wide-Area Blind Damped Lyman Alpha System Survey of the Local Universe"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1108.4011","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:bb5da2e7b9b1633327a5428abafdb27dba53dddd74a67fcbd7c65c3717d94364","target":"record","created_at":"2026-05-18T02:00:50Z","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":"49f8c2248fffe16f15f3d8c0afbf3b3fdfc56ab272bbc82a92a5ec06d037bd69","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-08-19T17:18:32Z","title_canon_sha256":"10666de4c197f53e99eaf9d07b8dd368aeefdbd20d2feeeb245f3de71ddcc71d"},"schema_version":"1.0","source":{"id":"1108.4011","kind":"arxiv","version":1}},"canonical_sha256":"379d04e0082ab9f2616f449a2e1fb5ec276ea52c8e1743bd86c606084f8e62d9","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"379d04e0082ab9f2616f449a2e1fb5ec276ea52c8e1743bd86c606084f8e62d9","first_computed_at":"2026-05-18T02:00:50.389742Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:00:50.389742Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"9rP1UiPS4m3kqzIgkp7d2eiGe/xeJLoqmy5wf+GGrEEadW5Hq5i4Ud4+USlM2pbQ4ns1X91yzGGDirj9hmBZBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:00:50.390351Z","signed_message":"canonical_sha256_bytes"},"source_id":"1108.4011","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:bb5da2e7b9b1633327a5428abafdb27dba53dddd74a67fcbd7c65c3717d94364","sha256:a5de2525e319f94ebedb456a3be602c62190409d827d0cbe506366f685165d1b"],"state_sha256":"0c1ee41b2095d8b515f1f73e1d8b5d62b6d55c9f3512a86e49e879e9619ebc63"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZMh+O16KeGypVipOH3c5c5EPtlkI+I7zp0EtDVJdZdWTEDLQYpR8TFD0wbzfZGu38uS8e6GxkH09ViJJtShxCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T00:36:28.075578Z","bundle_sha256":"37fd9790fddc2161311f16adb888a873d5e2dd907fe73d7bdea9de8f36088a3f"}}