{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:YLZO24DTMTYKQHUJFA5V52GGAE","short_pith_number":"pith:YLZO24DT","canonical_record":{"source":{"id":"1903.04159","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2019-03-11T08:03:35Z","cross_cats_sorted":[],"title_canon_sha256":"7b49a9497fc284832399d8686b24d3bad188a4ac5d802aadd509a4923c8590a3","abstract_canon_sha256":"b3f4fb6d02262b812b2dd0832fbb7d649785031f654908e3e62fad74985e1ad7"},"schema_version":"1.0"},"canonical_sha256":"c2f2ed707364f0a81e89283b5ee8c60125b55b39351a2de3e6b3144bf0089b6a","source":{"kind":"arxiv","id":"1903.04159","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.04159","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"arxiv_version","alias_value":"1903.04159v1","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.04159","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"pith_short_12","alias_value":"YLZO24DTMTYK","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YLZO24DTMTYKQHUJ","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YLZO24DT","created_at":"2026-05-18T12:33:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:YLZO24DTMTYKQHUJFA5V52GGAE","target":"record","payload":{"canonical_record":{"source":{"id":"1903.04159","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2019-03-11T08:03:35Z","cross_cats_sorted":[],"title_canon_sha256":"7b49a9497fc284832399d8686b24d3bad188a4ac5d802aadd509a4923c8590a3","abstract_canon_sha256":"b3f4fb6d02262b812b2dd0832fbb7d649785031f654908e3e62fad74985e1ad7"},"schema_version":"1.0"},"canonical_sha256":"c2f2ed707364f0a81e89283b5ee8c60125b55b39351a2de3e6b3144bf0089b6a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:51:36.332255Z","signature_b64":"+TtP9stP+UxqVj2Ps73j4oAWL97jsKtqQZLMYtoxr0cG2IXeQZlmtCQ9XGPpawJwQcAiZP2/D+vQdvz8tOo5Dw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c2f2ed707364f0a81e89283b5ee8c60125b55b39351a2de3e6b3144bf0089b6a","last_reissued_at":"2026-05-17T23:51:36.331689Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:51:36.331689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.04159","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":"2026-05-17T23:51:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UIXqOctAT5AuezPx53jGxkYjmvMAumdh5POQXRZSNz4RLsfnKtPt474Exg4auRkfc9jNbwdv+v9aw9DWZaZJDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T06:22:47.960815Z"},"content_sha256":"f17a0b0d06ee41fdd1dbf3cf3ae230eaef02792cfe41457f8689a33d7fc3ed13","schema_version":"1.0","event_id":"sha256:f17a0b0d06ee41fdd1dbf3cf3ae230eaef02792cfe41457f8689a33d7fc3ed13"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:YLZO24DTMTYKQHUJFA5V52GGAE","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards Deriving Verification Properties","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.SE","authors_text":"Michael Winikoff","submitted_at":"2019-03-11T08:03:35Z","abstract_excerpt":"Formal software verification uses mathematical techniques to establish that software has certain properties. For example, that the behaviour of a software system satisfies certain logically-specified properties. Formal methods have a long history, but a recurring assumption is that the properties to be verified are known, or provided as part of the requirements elicitation process. This working note considers the question: where do the verification properties come from? It proposes a process for systematically identifying verification properties."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.04159","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":"2026-05-17T23:51:36Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9nfHoudnkD99kgFf5/JwVxznF7SVxmJGHK/dwo1syBQSQTmYWR2IsrmpS9nqIvgJi7zFrReqWGfFIXBHjJS2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T06:22:47.961168Z"},"content_sha256":"24931fe7617d0e33213ee9820b8562ca2588eb14f6f27cbb2a19df9fc8eb6e9c","schema_version":"1.0","event_id":"sha256:24931fe7617d0e33213ee9820b8562ca2588eb14f6f27cbb2a19df9fc8eb6e9c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YLZO24DTMTYKQHUJFA5V52GGAE/bundle.json","state_url":"https://pith.science/pith/YLZO24DTMTYKQHUJFA5V52GGAE/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YLZO24DTMTYKQHUJFA5V52GGAE/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":"2026-05-28T06:22:47Z","links":{"resolver":"https://pith.science/pith/YLZO24DTMTYKQHUJFA5V52GGAE","bundle":"https://pith.science/pith/YLZO24DTMTYKQHUJFA5V52GGAE/bundle.json","state":"https://pith.science/pith/YLZO24DTMTYKQHUJFA5V52GGAE/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YLZO24DTMTYKQHUJFA5V52GGAE/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:YLZO24DTMTYKQHUJFA5V52GGAE","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":"b3f4fb6d02262b812b2dd0832fbb7d649785031f654908e3e62fad74985e1ad7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2019-03-11T08:03:35Z","title_canon_sha256":"7b49a9497fc284832399d8686b24d3bad188a4ac5d802aadd509a4923c8590a3"},"schema_version":"1.0","source":{"id":"1903.04159","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.04159","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"arxiv_version","alias_value":"1903.04159v1","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.04159","created_at":"2026-05-17T23:51:36Z"},{"alias_kind":"pith_short_12","alias_value":"YLZO24DTMTYK","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_16","alias_value":"YLZO24DTMTYKQHUJ","created_at":"2026-05-18T12:33:33Z"},{"alias_kind":"pith_short_8","alias_value":"YLZO24DT","created_at":"2026-05-18T12:33:33Z"}],"graph_snapshots":[{"event_id":"sha256:24931fe7617d0e33213ee9820b8562ca2588eb14f6f27cbb2a19df9fc8eb6e9c","target":"graph","created_at":"2026-05-17T23:51:36Z","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":"Formal software verification uses mathematical techniques to establish that software has certain properties. For example, that the behaviour of a software system satisfies certain logically-specified properties. Formal methods have a long history, but a recurring assumption is that the properties to be verified are known, or provided as part of the requirements elicitation process. This working note considers the question: where do the verification properties come from? It proposes a process for systematically identifying verification properties.","authors_text":"Michael Winikoff","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2019-03-11T08:03:35Z","title":"Towards Deriving Verification Properties"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.04159","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:f17a0b0d06ee41fdd1dbf3cf3ae230eaef02792cfe41457f8689a33d7fc3ed13","target":"record","created_at":"2026-05-17T23:51:36Z","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":"b3f4fb6d02262b812b2dd0832fbb7d649785031f654908e3e62fad74985e1ad7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SE","submitted_at":"2019-03-11T08:03:35Z","title_canon_sha256":"7b49a9497fc284832399d8686b24d3bad188a4ac5d802aadd509a4923c8590a3"},"schema_version":"1.0","source":{"id":"1903.04159","kind":"arxiv","version":1}},"canonical_sha256":"c2f2ed707364f0a81e89283b5ee8c60125b55b39351a2de3e6b3144bf0089b6a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c2f2ed707364f0a81e89283b5ee8c60125b55b39351a2de3e6b3144bf0089b6a","first_computed_at":"2026-05-17T23:51:36.331689Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:51:36.331689Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"+TtP9stP+UxqVj2Ps73j4oAWL97jsKtqQZLMYtoxr0cG2IXeQZlmtCQ9XGPpawJwQcAiZP2/D+vQdvz8tOo5Dw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:51:36.332255Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.04159","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f17a0b0d06ee41fdd1dbf3cf3ae230eaef02792cfe41457f8689a33d7fc3ed13","sha256:24931fe7617d0e33213ee9820b8562ca2588eb14f6f27cbb2a19df9fc8eb6e9c"],"state_sha256":"0594dc154cae5387ef4f06d22151283a4ba3e83c25ac12ad140dd0d74e119300"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xIPv58lYLaBsdMYLtBINJywvROuSWnrBEPwykwY/P80YTM4VQZXKC3PQcwD4cES61hM0fUGqXjIKEIgutTLaBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T06:22:47.963284Z","bundle_sha256":"8e7e99fe718aad840292e6bebf2cc53a6a2202c7af2ee47d800eaef6a8a92712"}}