{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:KPKOKXPQ54775F3ALG3ZBOLYYD","short_pith_number":"pith:KPKOKXPQ","canonical_record":{"source":{"id":"1510.04660","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-15T18:47:25Z","cross_cats_sorted":[],"title_canon_sha256":"6203c71df50d24416e2b2444b5eb5c58c85b6700a05f8fdf3612a46c6dbf65c1","abstract_canon_sha256":"e1c91af30cca31b28fd190b2e9da7613f8344bb105234ac7884be45a766a3f8a"},"schema_version":"1.0"},"canonical_sha256":"53d4e55df0ef3ffe976059b790b978c0f454180910949a1ddf4a4c056ef3973b","source":{"kind":"arxiv","id":"1510.04660","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.04660","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"arxiv_version","alias_value":"1510.04660v1","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.04660","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"pith_short_12","alias_value":"KPKOKXPQ5477","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KPKOKXPQ54775F3A","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KPKOKXPQ","created_at":"2026-05-18T12:29:29Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:KPKOKXPQ54775F3ALG3ZBOLYYD","target":"record","payload":{"canonical_record":{"source":{"id":"1510.04660","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-15T18:47:25Z","cross_cats_sorted":[],"title_canon_sha256":"6203c71df50d24416e2b2444b5eb5c58c85b6700a05f8fdf3612a46c6dbf65c1","abstract_canon_sha256":"e1c91af30cca31b28fd190b2e9da7613f8344bb105234ac7884be45a766a3f8a"},"schema_version":"1.0"},"canonical_sha256":"53d4e55df0ef3ffe976059b790b978c0f454180910949a1ddf4a4c056ef3973b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:22:35.317508Z","signature_b64":"QgK5X0ai0KCbXglf/zRNS4Pb/favBS99YHBaY+aCD5zyGOsEVSTy45ImoSDchFi8T80tfOEzUoMuX0n9IYZLDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"53d4e55df0ef3ffe976059b790b978c0f454180910949a1ddf4a4c056ef3973b","last_reissued_at":"2026-05-18T01:22:35.317093Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:22:35.317093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1510.04660","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":"2026-05-18T01:22:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"dexgHcXBd0+7ZVcHEOlHnDRML6QazCoUTlfRd7E0xo6Cc4dNDnn0ZTIx7pA1kfMYD0ff0hUrQfYvmDbDZuM8BA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:15:30.102916Z"},"content_sha256":"8b5a4624a1e80572af65576562c3d07b214bb823c4c80370b0e30fc2885ca4b8","schema_version":"1.0","event_id":"sha256:8b5a4624a1e80572af65576562c3d07b214bb823c4c80370b0e30fc2885ca4b8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:KPKOKXPQ54775F3ALG3ZBOLYYD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Extragalactic HI Surveys","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Martha P. Haynes, Riccardo Giovanelli","submitted_at":"2015-10-15T18:47:25Z","abstract_excerpt":"We review the results of HI line surveys of extragalactic sources in the local Universe. In the last two decades major efforts have been made in establishing on firm statistical grounds the properties of the HI source population, the two most prominent being the HI Parkes All Sky Survey (HIPASS) and the Arecibo Legacy Fast ALFA survey (ALFALFA). We review the choices of technical parameters in the design and optimization of spectro-photometric \"blind\" HI surveys, which for the first time produced extensive HI-selected data sets. Particular attention is given to the relationship between optical"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.04660","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":"2026-05-18T01:22:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1VBF8mSaZQ5PW5h6dKP9fTUxJBy11DhHYki+t4kmtqIDaonbJI13YueO5Gi8J5uB3rN9+QRMFDhXpUt1tENoDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T18:15:30.103651Z"},"content_sha256":"8a4bdc959ecfaa6039c65c40caacadcbc072561e66d6bcd0484855c4d58bdbbe","schema_version":"1.0","event_id":"sha256:8a4bdc959ecfaa6039c65c40caacadcbc072561e66d6bcd0484855c4d58bdbbe"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/bundle.json","state_url":"https://pith.science/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/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":"2026-05-25T18:15:30Z","links":{"resolver":"https://pith.science/pith/KPKOKXPQ54775F3ALG3ZBOLYYD","bundle":"https://pith.science/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/bundle.json","state":"https://pith.science/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/KPKOKXPQ54775F3ALG3ZBOLYYD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:KPKOKXPQ54775F3ALG3ZBOLYYD","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":"e1c91af30cca31b28fd190b2e9da7613f8344bb105234ac7884be45a766a3f8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-15T18:47:25Z","title_canon_sha256":"6203c71df50d24416e2b2444b5eb5c58c85b6700a05f8fdf3612a46c6dbf65c1"},"schema_version":"1.0","source":{"id":"1510.04660","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1510.04660","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"arxiv_version","alias_value":"1510.04660v1","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1510.04660","created_at":"2026-05-18T01:22:35Z"},{"alias_kind":"pith_short_12","alias_value":"KPKOKXPQ5477","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_16","alias_value":"KPKOKXPQ54775F3A","created_at":"2026-05-18T12:29:29Z"},{"alias_kind":"pith_short_8","alias_value":"KPKOKXPQ","created_at":"2026-05-18T12:29:29Z"}],"graph_snapshots":[{"event_id":"sha256:8a4bdc959ecfaa6039c65c40caacadcbc072561e66d6bcd0484855c4d58bdbbe","target":"graph","created_at":"2026-05-18T01:22:35Z","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 review the results of HI line surveys of extragalactic sources in the local Universe. In the last two decades major efforts have been made in establishing on firm statistical grounds the properties of the HI source population, the two most prominent being the HI Parkes All Sky Survey (HIPASS) and the Arecibo Legacy Fast ALFA survey (ALFALFA). We review the choices of technical parameters in the design and optimization of spectro-photometric \"blind\" HI surveys, which for the first time produced extensive HI-selected data sets. Particular attention is given to the relationship between optical","authors_text":"Martha P. Haynes, Riccardo Giovanelli","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-15T18:47:25Z","title":"Extragalactic HI Surveys"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1510.04660","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":"sha256:8b5a4624a1e80572af65576562c3d07b214bb823c4c80370b0e30fc2885ca4b8","target":"record","created_at":"2026-05-18T01:22:35Z","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":"e1c91af30cca31b28fd190b2e9da7613f8344bb105234ac7884be45a766a3f8a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2015-10-15T18:47:25Z","title_canon_sha256":"6203c71df50d24416e2b2444b5eb5c58c85b6700a05f8fdf3612a46c6dbf65c1"},"schema_version":"1.0","source":{"id":"1510.04660","kind":"arxiv","version":1}},"canonical_sha256":"53d4e55df0ef3ffe976059b790b978c0f454180910949a1ddf4a4c056ef3973b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"53d4e55df0ef3ffe976059b790b978c0f454180910949a1ddf4a4c056ef3973b","first_computed_at":"2026-05-18T01:22:35.317093Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:22:35.317093Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"QgK5X0ai0KCbXglf/zRNS4Pb/favBS99YHBaY+aCD5zyGOsEVSTy45ImoSDchFi8T80tfOEzUoMuX0n9IYZLDQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:22:35.317508Z","signed_message":"canonical_sha256_bytes"},"source_id":"1510.04660","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:8b5a4624a1e80572af65576562c3d07b214bb823c4c80370b0e30fc2885ca4b8","sha256:8a4bdc959ecfaa6039c65c40caacadcbc072561e66d6bcd0484855c4d58bdbbe"],"state_sha256":"40013665b1200a0f3e5f0a9adae848f0ac2b20b13d0189ab4f17d0e01d4842a9"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aSJTZ1J3HZxXNBqA7PIebIstojpCYudJTQITpt6YA2Z4OZuBfQqOoIfBgqdLkI/Pd7IXalPL+lEQZxxrqXM9DA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T18:15:30.106798Z","bundle_sha256":"6119c3b0a094a78647a6a9365877c32233e3271b9de3efc1d07c46074d53495c"}}