{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2012:P2X5DSVSHXJ35ESVMNG33Q2UX3","short_pith_number":"pith:P2X5DSVS","canonical_record":{"source":{"id":"1208.5895","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2012-08-29T12:25:10Z","cross_cats_sorted":[],"title_canon_sha256":"b69297e3c51072b315e40773d0a306af5e91986044db15742191bafb6d822796","abstract_canon_sha256":"772299fab557a50cf1f4cae6e1db6d98c8d4482d14eaf98eb03964486853725a"},"schema_version":"1.0"},"canonical_sha256":"7eafd1cab23dd3be9255634dbdc354bef996a2548396b64b0e22bd5b0257d35c","source":{"kind":"arxiv","id":"1208.5895","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.5895","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"arxiv_version","alias_value":"1208.5895v2","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.5895","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"pith_short_12","alias_value":"P2X5DSVSHXJ3","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"P2X5DSVSHXJ35ESV","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"P2X5DSVS","created_at":"2026-05-18T12:27:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2012:P2X5DSVSHXJ35ESVMNG33Q2UX3","target":"record","payload":{"canonical_record":{"source":{"id":"1208.5895","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2012-08-29T12:25:10Z","cross_cats_sorted":[],"title_canon_sha256":"b69297e3c51072b315e40773d0a306af5e91986044db15742191bafb6d822796","abstract_canon_sha256":"772299fab557a50cf1f4cae6e1db6d98c8d4482d14eaf98eb03964486853725a"},"schema_version":"1.0"},"canonical_sha256":"7eafd1cab23dd3be9255634dbdc354bef996a2548396b64b0e22bd5b0257d35c","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:38.576231Z","signature_b64":"2fe2Q5w3Xe/Qv3z1xnJcXS1K7hiyFxTafGyAnNOugF4/ntuNlWL3PWUfVkSUIpD/6XhxIzaokocLaEKMmSydAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7eafd1cab23dd3be9255634dbdc354bef996a2548396b64b0e22bd5b0257d35c","last_reissued_at":"2026-05-18T01:37:38.575656Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:38.575656Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1208.5895","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":"2026-05-18T01:37:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gek9AHVu8+wjJ42pbR39Y0HYJPjygr2Gknp2i2dKbM6brTvExyjkM+R2rBVuC+PkzXA0Qhtg0g431x+g7bslAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:58:10.402361Z"},"content_sha256":"4404d3ad83324a6c7666a287e562da64086c8abf78507bb07e6b7aebc4f46f39","schema_version":"1.0","event_id":"sha256:4404d3ad83324a6c7666a287e562da64086c8abf78507bb07e6b7aebc4f46f39"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2012:P2X5DSVSHXJ35ESVMNG33Q2UX3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Two for the Price of One: Lifting Separation Logic Assertions","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"cs.PL","authors_text":"Hongseok Yang (University of Oxford), Jacob Thamsborg (IT University of Copenhagen), Lars Birkedal (IT University of Copenhagen)","submitted_at":"2012-08-29T12:25:10Z","abstract_excerpt":"Recently, data abstraction has been studied in the context of separation logic, with noticeable practical successes: the developed logics have enabled clean proofs of tricky challenging programs, such as subject-observer patterns, and they have become the basis of efficient verification tools for Java (jStar), C (VeriFast) and Hoare Type Theory (Ynot). In this paper, we give a new semantic analysis of such logic-based approaches using Reynolds's relational parametricity. The core of the analysis is our lifting theorems, which give a sound and complete condition for when a true implication betw"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.5895","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":"2026-05-18T01:37:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+q0btaDhrlVaGaSYZP9RwDf48GfMWvrdFDq34celVqyJWY5OudLlfQKjgqpb77OONFimULDUhkFnftykFER6Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T04:58:10.403020Z"},"content_sha256":"0a1e8522071af1edd36e3c24e9ff030cb72713fba1d0b1d663aa3b74373b6b31","schema_version":"1.0","event_id":"sha256:0a1e8522071af1edd36e3c24e9ff030cb72713fba1d0b1d663aa3b74373b6b31"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/bundle.json","state_url":"https://pith.science/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/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":"2026-05-30T04:58:10Z","links":{"resolver":"https://pith.science/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3","bundle":"https://pith.science/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/bundle.json","state":"https://pith.science/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P2X5DSVSHXJ35ESVMNG33Q2UX3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2012:P2X5DSVSHXJ35ESVMNG33Q2UX3","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":"772299fab557a50cf1f4cae6e1db6d98c8d4482d14eaf98eb03964486853725a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2012-08-29T12:25:10Z","title_canon_sha256":"b69297e3c51072b315e40773d0a306af5e91986044db15742191bafb6d822796"},"schema_version":"1.0","source":{"id":"1208.5895","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1208.5895","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"arxiv_version","alias_value":"1208.5895v2","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1208.5895","created_at":"2026-05-18T01:37:38Z"},{"alias_kind":"pith_short_12","alias_value":"P2X5DSVSHXJ3","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_16","alias_value":"P2X5DSVSHXJ35ESV","created_at":"2026-05-18T12:27:18Z"},{"alias_kind":"pith_short_8","alias_value":"P2X5DSVS","created_at":"2026-05-18T12:27:18Z"}],"graph_snapshots":[{"event_id":"sha256:0a1e8522071af1edd36e3c24e9ff030cb72713fba1d0b1d663aa3b74373b6b31","target":"graph","created_at":"2026-05-18T01:37:38Z","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":"Recently, data abstraction has been studied in the context of separation logic, with noticeable practical successes: the developed logics have enabled clean proofs of tricky challenging programs, such as subject-observer patterns, and they have become the basis of efficient verification tools for Java (jStar), C (VeriFast) and Hoare Type Theory (Ynot). In this paper, we give a new semantic analysis of such logic-based approaches using Reynolds's relational parametricity. The core of the analysis is our lifting theorems, which give a sound and complete condition for when a true implication betw","authors_text":"Hongseok Yang (University of Oxford), Jacob Thamsborg (IT University of Copenhagen), Lars Birkedal (IT University of Copenhagen)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2012-08-29T12:25:10Z","title":"Two for the Price of One: Lifting Separation Logic Assertions"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1208.5895","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":"sha256:4404d3ad83324a6c7666a287e562da64086c8abf78507bb07e6b7aebc4f46f39","target":"record","created_at":"2026-05-18T01:37:38Z","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":"772299fab557a50cf1f4cae6e1db6d98c8d4482d14eaf98eb03964486853725a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.PL","submitted_at":"2012-08-29T12:25:10Z","title_canon_sha256":"b69297e3c51072b315e40773d0a306af5e91986044db15742191bafb6d822796"},"schema_version":"1.0","source":{"id":"1208.5895","kind":"arxiv","version":2}},"canonical_sha256":"7eafd1cab23dd3be9255634dbdc354bef996a2548396b64b0e22bd5b0257d35c","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7eafd1cab23dd3be9255634dbdc354bef996a2548396b64b0e22bd5b0257d35c","first_computed_at":"2026-05-18T01:37:38.575656Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:38.575656Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"2fe2Q5w3Xe/Qv3z1xnJcXS1K7hiyFxTafGyAnNOugF4/ntuNlWL3PWUfVkSUIpD/6XhxIzaokocLaEKMmSydAg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:38.576231Z","signed_message":"canonical_sha256_bytes"},"source_id":"1208.5895","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:4404d3ad83324a6c7666a287e562da64086c8abf78507bb07e6b7aebc4f46f39","sha256:0a1e8522071af1edd36e3c24e9ff030cb72713fba1d0b1d663aa3b74373b6b31"],"state_sha256":"0d79e99b14122371a744b3595e78da6ef053398c1d4aacc940551160565ba3ce"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"D+xk/fr3YTVKfTj5Wr5DgNsrqo60Wc+IrinHYJgnhjWQbguYD+MoyahD6ekucS0T/DB97Tp7vf5BMQaJexANCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T04:58:10.406693Z","bundle_sha256":"4cdd086da1b1faf23c6e48032c28421867a5a9875280a02d98c61ec2a7081acb"}}