{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:S5GLNJQJIPA6ESBIG3BIAYLJOL","short_pith_number":"pith:S5GLNJQJ","canonical_record":{"source":{"id":"2102.09461","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2021-02-17T00:10:35Z","cross_cats_sorted":["math.OC"],"title_canon_sha256":"f92789d7752fe85b6d601ffd65978d1219e800caba928f758fe60315dcf427bb","abstract_canon_sha256":"3c34da850ff8b64dc1ddc7a5021e6b21b652125ead15085bb7f01532ee0418bf"},"schema_version":"1.0"},"canonical_sha256":"974cb6a60943c1e2482836c280616972d0855842ffba2a5aa4a50b3800f5b9b3","source":{"kind":"arxiv","id":"2102.09461","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.09461","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"arxiv_version","alias_value":"2102.09461v1","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.09461","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_12","alias_value":"S5GLNJQJIPA6","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_16","alias_value":"S5GLNJQJIPA6ESBI","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_8","alias_value":"S5GLNJQJ","created_at":"2026-07-05T02:16:23Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:S5GLNJQJIPA6ESBIG3BIAYLJOL","target":"record","payload":{"canonical_record":{"source":{"id":"2102.09461","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2021-02-17T00:10:35Z","cross_cats_sorted":["math.OC"],"title_canon_sha256":"f92789d7752fe85b6d601ffd65978d1219e800caba928f758fe60315dcf427bb","abstract_canon_sha256":"3c34da850ff8b64dc1ddc7a5021e6b21b652125ead15085bb7f01532ee0418bf"},"schema_version":"1.0"},"canonical_sha256":"974cb6a60943c1e2482836c280616972d0855842ffba2a5aa4a50b3800f5b9b3","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:16:23.188682Z","signature_b64":"T8CkuuDEBkC9dSF0aYSp6bA37xZZG9VIDmE4MAJKHsnJZvt/GrTQf/hVPtn1L48EAxOMZEs9t7i0/otAkTDaBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"974cb6a60943c1e2482836c280616972d0855842ffba2a5aa4a50b3800f5b9b3","last_reissued_at":"2026-07-05T02:16:23.188321Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:16:23.188321Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2102.09461","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":"2026-07-05T02:16:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9SzzVl+nrxp+i133SFCYLrz2T+Y8hLyjJ6/1avPHObUp21Z46lKM7/l8fM3NY3sGbGdRUJd6uQSwpGgb3nlxCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T17:05:19.638619Z"},"content_sha256":"35699e0d2272450d6c238f7abaa9bc018e6344dad4695ba7fd8b30f9c0c210d3","schema_version":"1.0","event_id":"sha256:35699e0d2272450d6c238f7abaa9bc018e6344dad4695ba7fd8b30f9c0c210d3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:S5GLNJQJIPA6ESBIG3BIAYLJOL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optimization Helps Scheduling Nursing Staff at the Long-Term Care Homes of the City of Toronto","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["math.OC"],"primary_cat":"cs.CY","authors_text":"Manion Anderson, Merve Bodur, Scott Rathwell, Vahid Sarhangian","submitted_at":"2021-02-17T00:10:35Z","abstract_excerpt":"The City of Toronto Long Term Care Homes & Services (LTCH&S) division is one of the largest providers of long-term care in the Canadian province of Ontario, providing care to 2,640 residents at 10 homes across Toronto. Our collaboration with LTCH&S was initiated to facilitate the increasingly challenging task of scheduling nursing staff and reduce high absenteeism rate observed among the part-time nurses. We developed a spreadsheet-based scheduling tool to automate the generation of schedules and incorporate nurses' preferences for different shifts into the schedules. At the core of the schedu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.09461","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/2102.09461/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":"2026-07-05T02:16:23Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e7weUNcZYivDNMY0LnP6k9J+KqPyiv3Mq2aZ8HA+k7MbJq9WHNFgMlvgovDt6Z9Fs5W8he2KSpQgl1t5dHybBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-06T17:05:19.639150Z"},"content_sha256":"48fecbf1f7d4f48385fabccae6a1db801948da8ff27a5c222833d6a44d27e80c","schema_version":"1.0","event_id":"sha256:48fecbf1f7d4f48385fabccae6a1db801948da8ff27a5c222833d6a44d27e80c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/bundle.json","state_url":"https://pith.science/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/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":"2026-08-06T17:05:19Z","links":{"resolver":"https://pith.science/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL","bundle":"https://pith.science/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/bundle.json","state":"https://pith.science/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S5GLNJQJIPA6ESBIG3BIAYLJOL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:S5GLNJQJIPA6ESBIG3BIAYLJOL","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":"3c34da850ff8b64dc1ddc7a5021e6b21b652125ead15085bb7f01532ee0418bf","cross_cats_sorted":["math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2021-02-17T00:10:35Z","title_canon_sha256":"f92789d7752fe85b6d601ffd65978d1219e800caba928f758fe60315dcf427bb"},"schema_version":"1.0","source":{"id":"2102.09461","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2102.09461","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"arxiv_version","alias_value":"2102.09461v1","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2102.09461","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_12","alias_value":"S5GLNJQJIPA6","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_16","alias_value":"S5GLNJQJIPA6ESBI","created_at":"2026-07-05T02:16:23Z"},{"alias_kind":"pith_short_8","alias_value":"S5GLNJQJ","created_at":"2026-07-05T02:16:23Z"}],"graph_snapshots":[{"event_id":"sha256:48fecbf1f7d4f48385fabccae6a1db801948da8ff27a5c222833d6a44d27e80c","target":"graph","created_at":"2026-07-05T02:16:23Z","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/2102.09461/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The City of Toronto Long Term Care Homes & Services (LTCH&S) division is one of the largest providers of long-term care in the Canadian province of Ontario, providing care to 2,640 residents at 10 homes across Toronto. Our collaboration with LTCH&S was initiated to facilitate the increasingly challenging task of scheduling nursing staff and reduce high absenteeism rate observed among the part-time nurses. We developed a spreadsheet-based scheduling tool to automate the generation of schedules and incorporate nurses' preferences for different shifts into the schedules. At the core of the schedu","authors_text":"Manion Anderson, Merve Bodur, Scott Rathwell, Vahid Sarhangian","cross_cats":["math.OC"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2021-02-17T00:10:35Z","title":"Optimization Helps Scheduling Nursing Staff at the Long-Term Care Homes of the City of Toronto"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2102.09461","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":"sha256:35699e0d2272450d6c238f7abaa9bc018e6344dad4695ba7fd8b30f9c0c210d3","target":"record","created_at":"2026-07-05T02:16:23Z","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":"3c34da850ff8b64dc1ddc7a5021e6b21b652125ead15085bb7f01532ee0418bf","cross_cats_sorted":["math.OC"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CY","submitted_at":"2021-02-17T00:10:35Z","title_canon_sha256":"f92789d7752fe85b6d601ffd65978d1219e800caba928f758fe60315dcf427bb"},"schema_version":"1.0","source":{"id":"2102.09461","kind":"arxiv","version":1}},"canonical_sha256":"974cb6a60943c1e2482836c280616972d0855842ffba2a5aa4a50b3800f5b9b3","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"974cb6a60943c1e2482836c280616972d0855842ffba2a5aa4a50b3800f5b9b3","first_computed_at":"2026-07-05T02:16:23.188321Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:16:23.188321Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"T8CkuuDEBkC9dSF0aYSp6bA37xZZG9VIDmE4MAJKHsnJZvt/GrTQf/hVPtn1L48EAxOMZEs9t7i0/otAkTDaBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T02:16:23.188682Z","signed_message":"canonical_sha256_bytes"},"source_id":"2102.09461","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:35699e0d2272450d6c238f7abaa9bc018e6344dad4695ba7fd8b30f9c0c210d3","sha256:48fecbf1f7d4f48385fabccae6a1db801948da8ff27a5c222833d6a44d27e80c"],"state_sha256":"2943f11f7edadbd549b2834b02c4be1584e0c658e19a2a9b4c121e2045973ec2"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"FaLQ9PIbZF5ccZShSx3aacvFx1QZTDb3qLeBRKmR/af8xIDua/hVgx1tskYnFJvofN9X1Cn0SJ95K7gcAjR1Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-06T17:05:19.646897Z","bundle_sha256":"6ce35ee304e3fd8a03d52dae471aacd26128dddc6e82c99daa5089e5a5982f54"}}