{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:GJFMOML5HAULYIRLCFXMAXS7TI","short_pith_number":"pith:GJFMOML5","canonical_record":{"source":{"id":"1905.09520","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2019-05-23T08:00:17Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"88a43c32f1bc9237f257ad5d557a6fb55f9871c91f6d9fef8c6eb293e5cc6b01","abstract_canon_sha256":"d559fefe9a25e3c084722e106c9da815b7ca1a29165704b9268effa1028addee"},"schema_version":"1.0"},"canonical_sha256":"324ac7317d3828bc222b116ec05e5f9a2296f5df24d5d6077d8144fbaf658026","source":{"kind":"arxiv","id":"1905.09520","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.09520","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"arxiv_version","alias_value":"1905.09520v2","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.09520","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_12","alias_value":"GJFMOML5HAUL","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_16","alias_value":"GJFMOML5HAULYIRL","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_8","alias_value":"GJFMOML5","created_at":"2026-06-04T20:14:32Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:GJFMOML5HAULYIRLCFXMAXS7TI","target":"record","payload":{"canonical_record":{"source":{"id":"1905.09520","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2019-05-23T08:00:17Z","cross_cats_sorted":["cs.SY","eess.SY"],"title_canon_sha256":"88a43c32f1bc9237f257ad5d557a6fb55f9871c91f6d9fef8c6eb293e5cc6b01","abstract_canon_sha256":"d559fefe9a25e3c084722e106c9da815b7ca1a29165704b9268effa1028addee"},"schema_version":"1.0"},"canonical_sha256":"324ac7317d3828bc222b116ec05e5f9a2296f5df24d5d6077d8144fbaf658026","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-04T20:14:32.543879Z","signature_b64":"RQ3WNvYnVxjN91f1VvCzxugrkitYaMN98aVXLFOw0tNend5+GhSNmVMVfh7CLl2AC/q4VepJ8M5ByBu6hox2DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"324ac7317d3828bc222b116ec05e5f9a2296f5df24d5d6077d8144fbaf658026","last_reissued_at":"2026-06-04T20:14:32.543447Z","signature_status":"signed_v1","first_computed_at":"2026-06-04T20:14:32.543447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1905.09520","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":"2026-06-04T20:14:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JXzOyOtU+fbQHXoZcioGu+nwvoGAWelcfjC2kAbvYp6MKxCUNkzFEj5n/q/lO2ZwiSLTpYHnf1FdJGb5AIrGBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T22:54:11.794945Z"},"content_sha256":"37f10be20c25f7c3ee0ad4074ddc883c7a0dba3741b9ce5019155adb34c32b46","schema_version":"1.0","event_id":"sha256:37f10be20c25f7c3ee0ad4074ddc883c7a0dba3741b9ce5019155adb34c32b46"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:GJFMOML5HAULYIRLCFXMAXS7TI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Towards Physical Hybrid Systems","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SY","eess.SY"],"primary_cat":"cs.LO","authors_text":"Andr\\'e Platzer, Katherine Cordwell","submitted_at":"2019-05-23T08:00:17Z","abstract_excerpt":"Some hybrid systems models are unsafe for mathematically correct but physically unrealistic reasons. For example, mathematical models can classify a system as being unsafe on a set that is too small to have physical importance. In particular, differences in measure zero sets in models of cyber-physical systems (CPS) have significant mathematical impact on the mathematical safety of these models even though differences on measure zero sets have no tangible physical effect in a real system. We develop the concept of \"physical hybrid systems\" (PHS) to help reunite mathematical models with physica"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.09520","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1905.09520/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":"2026-06-04T20:14:32Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pW2GTrlPYhb1Shpjzcwv6NrjZTqv3VxlWs+WR8DdBxWVdizd9ELQgq1Vo1o/rm8Mwfs8ZjqYowCQ2rQ5myPiBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-22T22:54:11.795365Z"},"content_sha256":"db9901b68f85b99baf30ad43027c955eaff8ea4e8468e427a89ae000289be690","schema_version":"1.0","event_id":"sha256:db9901b68f85b99baf30ad43027c955eaff8ea4e8468e427a89ae000289be690"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GJFMOML5HAULYIRLCFXMAXS7TI/bundle.json","state_url":"https://pith.science/pith/GJFMOML5HAULYIRLCFXMAXS7TI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GJFMOML5HAULYIRLCFXMAXS7TI/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":"2026-06-22T22:54:11Z","links":{"resolver":"https://pith.science/pith/GJFMOML5HAULYIRLCFXMAXS7TI","bundle":"https://pith.science/pith/GJFMOML5HAULYIRLCFXMAXS7TI/bundle.json","state":"https://pith.science/pith/GJFMOML5HAULYIRLCFXMAXS7TI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GJFMOML5HAULYIRLCFXMAXS7TI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:GJFMOML5HAULYIRLCFXMAXS7TI","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":"d559fefe9a25e3c084722e106c9da815b7ca1a29165704b9268effa1028addee","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2019-05-23T08:00:17Z","title_canon_sha256":"88a43c32f1bc9237f257ad5d557a6fb55f9871c91f6d9fef8c6eb293e5cc6b01"},"schema_version":"1.0","source":{"id":"1905.09520","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1905.09520","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"arxiv_version","alias_value":"1905.09520v2","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1905.09520","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_12","alias_value":"GJFMOML5HAUL","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_16","alias_value":"GJFMOML5HAULYIRL","created_at":"2026-06-04T20:14:32Z"},{"alias_kind":"pith_short_8","alias_value":"GJFMOML5","created_at":"2026-06-04T20:14:32Z"}],"graph_snapshots":[{"event_id":"sha256:db9901b68f85b99baf30ad43027c955eaff8ea4e8468e427a89ae000289be690","target":"graph","created_at":"2026-06-04T20:14:32Z","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/1905.09520/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Some hybrid systems models are unsafe for mathematically correct but physically unrealistic reasons. For example, mathematical models can classify a system as being unsafe on a set that is too small to have physical importance. In particular, differences in measure zero sets in models of cyber-physical systems (CPS) have significant mathematical impact on the mathematical safety of these models even though differences on measure zero sets have no tangible physical effect in a real system. We develop the concept of \"physical hybrid systems\" (PHS) to help reunite mathematical models with physica","authors_text":"Andr\\'e Platzer, Katherine Cordwell","cross_cats":["cs.SY","eess.SY"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2019-05-23T08:00:17Z","title":"Towards Physical Hybrid Systems"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1905.09520","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":"sha256:37f10be20c25f7c3ee0ad4074ddc883c7a0dba3741b9ce5019155adb34c32b46","target":"record","created_at":"2026-06-04T20:14:32Z","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":"d559fefe9a25e3c084722e106c9da815b7ca1a29165704b9268effa1028addee","cross_cats_sorted":["cs.SY","eess.SY"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2019-05-23T08:00:17Z","title_canon_sha256":"88a43c32f1bc9237f257ad5d557a6fb55f9871c91f6d9fef8c6eb293e5cc6b01"},"schema_version":"1.0","source":{"id":"1905.09520","kind":"arxiv","version":2}},"canonical_sha256":"324ac7317d3828bc222b116ec05e5f9a2296f5df24d5d6077d8144fbaf658026","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"324ac7317d3828bc222b116ec05e5f9a2296f5df24d5d6077d8144fbaf658026","first_computed_at":"2026-06-04T20:14:32.543447Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-04T20:14:32.543447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"RQ3WNvYnVxjN91f1VvCzxugrkitYaMN98aVXLFOw0tNend5+GhSNmVMVfh7CLl2AC/q4VepJ8M5ByBu6hox2DA==","signature_status":"signed_v1","signed_at":"2026-06-04T20:14:32.543879Z","signed_message":"canonical_sha256_bytes"},"source_id":"1905.09520","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:37f10be20c25f7c3ee0ad4074ddc883c7a0dba3741b9ce5019155adb34c32b46","sha256:db9901b68f85b99baf30ad43027c955eaff8ea4e8468e427a89ae000289be690"],"state_sha256":"b83df392323a529086b3627e3c8de364e9ff8d2ff72f453a09ca86976737ea00"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tsWHg21yx5R9wU+Tbb6no+crSQiOTtAZGusSFqEIgANUjT7TuONL+dUC+h5nmuDBfvIxiY3BVn1X6U7g8u9xBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-22T22:54:11.797402Z","bundle_sha256":"ca2e52408996f953c2bbfc590ebea156a272a4e0bfa8f41c29fcef03a2de88b9"}}