{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2007:TPFTFJ4HMW3KN5B4ATDWKZL6UD","short_pith_number":"pith:TPFTFJ4H","canonical_record":{"source":{"id":"astro-ph/0702178","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-06T23:44:40Z","cross_cats_sorted":[],"title_canon_sha256":"de314a4713fa83ad6af4a28bd6526870c4a135cdb8257b9655a51da82b39b6f6","abstract_canon_sha256":"e7b0a3672b9d049c49da6ce48f18804571350d26be1d049e67a5beddd55f89a5"},"schema_version":"1.0"},"canonical_sha256":"9bcb32a78765b6a6f43c04c765657ea0d5307ddf52b2a664e1ce897eb818d109","source":{"kind":"arxiv","id":"astro-ph/0702178","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0702178","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0702178v1","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0702178","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_12","alias_value":"TPFTFJ4HMW3K","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_16","alias_value":"TPFTFJ4HMW3KN5B4","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_8","alias_value":"TPFTFJ4H","created_at":"2026-07-04T15:25:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2007:TPFTFJ4HMW3KN5B4ATDWKZL6UD","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0702178","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-06T23:44:40Z","cross_cats_sorted":[],"title_canon_sha256":"de314a4713fa83ad6af4a28bd6526870c4a135cdb8257b9655a51da82b39b6f6","abstract_canon_sha256":"e7b0a3672b9d049c49da6ce48f18804571350d26be1d049e67a5beddd55f89a5"},"schema_version":"1.0"},"canonical_sha256":"9bcb32a78765b6a6f43c04c765657ea0d5307ddf52b2a664e1ce897eb818d109","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:25:01.786794Z","signature_b64":"ypnc5R4HlybaebckaOy5i3tXEbGWk1YR/JL5fUsV6jnHmq+SsKh3xJ8l6MgugjipdCebqpihEzQJoJ5iZuysBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9bcb32a78765b6a6f43c04c765657ea0d5307ddf52b2a664e1ce897eb818d109","last_reissued_at":"2026-07-04T15:25:01.786425Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:25:01.786425Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0702178","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":"2026-07-04T15:25:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"0ORKUXVCq1qPSO2Hx7bvcTx5WqbjZ2m+PDhKgwAD6t9nwHQxb9DzzdgIHylsIONYuB/GECd8nMGLIDGqUnjWBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T17:06:17.026671Z"},"content_sha256":"ce6d0b555257f6d02d0553d6a080463abc45d1ddb6f4e9fa12684a59d850289b","schema_version":"1.0","event_id":"sha256:ce6d0b555257f6d02d0553d6a080463abc45d1ddb6f4e9fa12684a59d850289b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2007:TPFTFJ4HMW3KN5B4ATDWKZL6UD","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Arecibo Legacy Fast ALFA Survey: IV. Strategies for Signal Identification and Survey Catalog Reliability","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Amelie Saintonge","submitted_at":"2007-02-06T23:44:40Z","abstract_excerpt":"We present a signal extraction utility written for the purposes of the Arecibo Legacy Fast ALFA survey (ALFALFA). This survey, when completed, will have covered 7000 square degrees of the high galactic latitude sky and should detect over 20,000 extragalactic objects. It is the most sensitive blind HI survey to date. The large size of the survey justifies in itself the need for an automated way of identifying signals in the data set. The matched-filtering signal extractor proposed is based on convolutions in the Fourier domain of templates of varying widths with each spectrum. The chosen templa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0702178","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0702178/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T15:25:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"wYbMhxyCuqx/BK1B8mOWWezeNU/V6dbc4lKEz8vM7vV0FdccGMu5QYa8n/j3Z7lJEyPWBGzEUeoaXUki3z7yBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-02T17:06:17.027183Z"},"content_sha256":"4ff5f55b5e129136dd5387ff92c88337ddf89dd5a9123679731e97df6e777bdf","schema_version":"1.0","event_id":"sha256:4ff5f55b5e129136dd5387ff92c88337ddf89dd5a9123679731e97df6e777bdf"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/bundle.json","state_url":"https://pith.science/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/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":"2026-08-02T17:06:17Z","links":{"resolver":"https://pith.science/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD","bundle":"https://pith.science/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/bundle.json","state":"https://pith.science/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TPFTFJ4HMW3KN5B4ATDWKZL6UD/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2007:TPFTFJ4HMW3KN5B4ATDWKZL6UD","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":"e7b0a3672b9d049c49da6ce48f18804571350d26be1d049e67a5beddd55f89a5","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-06T23:44:40Z","title_canon_sha256":"de314a4713fa83ad6af4a28bd6526870c4a135cdb8257b9655a51da82b39b6f6"},"schema_version":"1.0","source":{"id":"astro-ph/0702178","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0702178","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0702178v1","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0702178","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_12","alias_value":"TPFTFJ4HMW3K","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_16","alias_value":"TPFTFJ4HMW3KN5B4","created_at":"2026-07-04T15:25:01Z"},{"alias_kind":"pith_short_8","alias_value":"TPFTFJ4H","created_at":"2026-07-04T15:25:01Z"}],"graph_snapshots":[{"event_id":"sha256:4ff5f55b5e129136dd5387ff92c88337ddf89dd5a9123679731e97df6e777bdf","target":"graph","created_at":"2026-07-04T15:25:01Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0702178/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a signal extraction utility written for the purposes of the Arecibo Legacy Fast ALFA survey (ALFALFA). This survey, when completed, will have covered 7000 square degrees of the high galactic latitude sky and should detect over 20,000 extragalactic objects. It is the most sensitive blind HI survey to date. The large size of the survey justifies in itself the need for an automated way of identifying signals in the data set. The matched-filtering signal extractor proposed is based on convolutions in the Fourier domain of templates of varying widths with each spectrum. The chosen templa","authors_text":"Amelie Saintonge","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2007-02-06T23:44:40Z","title":"The Arecibo Legacy Fast ALFA Survey: IV. Strategies for Signal Identification and Survey Catalog Reliability"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0702178","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:ce6d0b555257f6d02d0553d6a080463abc45d1ddb6f4e9fa12684a59d850289b","target":"record","created_at":"2026-07-04T15:25:01Z","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":"e7b0a3672b9d049c49da6ce48f18804571350d26be1d049e67a5beddd55f89a5","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2007-02-06T23:44:40Z","title_canon_sha256":"de314a4713fa83ad6af4a28bd6526870c4a135cdb8257b9655a51da82b39b6f6"},"schema_version":"1.0","source":{"id":"astro-ph/0702178","kind":"arxiv","version":1}},"canonical_sha256":"9bcb32a78765b6a6f43c04c765657ea0d5307ddf52b2a664e1ce897eb818d109","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9bcb32a78765b6a6f43c04c765657ea0d5307ddf52b2a664e1ce897eb818d109","first_computed_at":"2026-07-04T15:25:01.786425Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T15:25:01.786425Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ypnc5R4HlybaebckaOy5i3tXEbGWk1YR/JL5fUsV6jnHmq+SsKh3xJ8l6MgugjipdCebqpihEzQJoJ5iZuysBw==","signature_status":"signed_v1","signed_at":"2026-07-04T15:25:01.786794Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0702178","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:ce6d0b555257f6d02d0553d6a080463abc45d1ddb6f4e9fa12684a59d850289b","sha256:4ff5f55b5e129136dd5387ff92c88337ddf89dd5a9123679731e97df6e777bdf"],"state_sha256":"25685a79267caf10047d30a5f9882932a2e3c4352061875e541bb08d49455a2b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JIdbexAcNhtLJ7JI2cQJYgquj3TP3agL0ngZc0f/UqiyVvzsZkwNb3bwhpFhsipOE5h5gyc5U5wCYMpHi9MQBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-02T17:06:17.031823Z","bundle_sha256":"f766290fa675d80174dcd0f95f618a9adf231b2ccb5177f699fb9f84fc9e3a50"}}