{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:HCNY7YD44UPODZUMDURTXRDRM3","short_pith_number":"pith:HCNY7YD4","canonical_record":{"source":{"id":"1710.03352","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2017-10-09T23:48:19Z","cross_cats_sorted":["cs.SE"],"title_canon_sha256":"641f8ac600d6e21d8e196f468f5574bcf5660f062c2c95288feec7e476d3e157","abstract_canon_sha256":"280c205bb68d749eacc6ca5a0609408a5da1354f10a53a14518a2204ba658f98"},"schema_version":"1.0"},"canonical_sha256":"389b8fe07ce51ee1e68c1d233bc47166c718c0dc0cfc91d6464ef79134b3c3b7","source":{"kind":"arxiv","id":"1710.03352","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.03352","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"arxiv_version","alias_value":"1710.03352v1","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.03352","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"pith_short_12","alias_value":"HCNY7YD44UPO","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"HCNY7YD44UPODZUM","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"HCNY7YD4","created_at":"2026-05-18T12:31:18Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:HCNY7YD44UPODZUMDURTXRDRM3","target":"record","payload":{"canonical_record":{"source":{"id":"1710.03352","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2017-10-09T23:48:19Z","cross_cats_sorted":["cs.SE"],"title_canon_sha256":"641f8ac600d6e21d8e196f468f5574bcf5660f062c2c95288feec7e476d3e157","abstract_canon_sha256":"280c205bb68d749eacc6ca5a0609408a5da1354f10a53a14518a2204ba658f98"},"schema_version":"1.0"},"canonical_sha256":"389b8fe07ce51ee1e68c1d233bc47166c718c0dc0cfc91d6464ef79134b3c3b7","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:33:12.298023Z","signature_b64":"lCHWzhtrNtxJeOu07dbQx/9WogHto2Q4O2yDQKJ9o6gdSa+vtrjdt7BWnEYGKnNCNdYusTczjy/1gP/65IgpDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"389b8fe07ce51ee1e68c1d233bc47166c718c0dc0cfc91d6464ef79134b3c3b7","last_reissued_at":"2026-05-18T00:33:12.297337Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:33:12.297337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1710.03352","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":"2026-05-18T00:33:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hIF7aQJh1Cc85hkFrCl3TqNGlCma2125byfYw0OqKTjX7pxuUrl+7Rgyre21bc5fHUTFwwE00hbgaKxpQMAMBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:12:41.796492Z"},"content_sha256":"99c0b1ca56825cffb15aed63e565d3e78ebe6cd97209002c528de83804e38633","schema_version":"1.0","event_id":"sha256:99c0b1ca56825cffb15aed63e565d3e78ebe6cd97209002c528de83804e38633"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:HCNY7YD44UPODZUMDURTXRDRM3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A synchronous program algebra: a basis for reasoning about shared-memory and event-based concurrency","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.SE"],"primary_cat":"cs.LO","authors_text":"Ian J. Hayes, Kirsten Winter, Larissa A. Meinicke, Robert J. Colvin","submitted_at":"2017-10-09T23:48:19Z","abstract_excerpt":"This research started with an algebra for reasoning about rely/guarantee concurrency for a shared memory model. The approach taken led to a more abstract algebra of atomic steps, in which atomic steps synchronise (rather than interleave) when composed in parallel. The algebra of rely/guarantee concurrency then becomes an instantiation of the more abstract algebra. Many of the core properties needed for rely/guarantee reasoning can be shown to hold in the abstract algebra where their proofs are simpler and hence allow a higher degree of automation. The algebra has been encoded in Isabelle/HOL t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.03352","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":"2026-05-18T00:33:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"WhPFnl4Uy4eByEatOJwzyV2G5oXkmlSsLrrbQ7qhZaEXUnbQxpGcvnua5IBADKzCUtnaS+0K8Xx2DshcL1veCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T19:12:41.796834Z"},"content_sha256":"ae00453ea8b37a0ad205f106976878ca3fcff1b6241699defea30395e8fddf7f","schema_version":"1.0","event_id":"sha256:ae00453ea8b37a0ad205f106976878ca3fcff1b6241699defea30395e8fddf7f"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HCNY7YD44UPODZUMDURTXRDRM3/bundle.json","state_url":"https://pith.science/pith/HCNY7YD44UPODZUMDURTXRDRM3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HCNY7YD44UPODZUMDURTXRDRM3/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":"2026-06-01T19:12:41Z","links":{"resolver":"https://pith.science/pith/HCNY7YD44UPODZUMDURTXRDRM3","bundle":"https://pith.science/pith/HCNY7YD44UPODZUMDURTXRDRM3/bundle.json","state":"https://pith.science/pith/HCNY7YD44UPODZUMDURTXRDRM3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HCNY7YD44UPODZUMDURTXRDRM3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:HCNY7YD44UPODZUMDURTXRDRM3","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":"280c205bb68d749eacc6ca5a0609408a5da1354f10a53a14518a2204ba658f98","cross_cats_sorted":["cs.SE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2017-10-09T23:48:19Z","title_canon_sha256":"641f8ac600d6e21d8e196f468f5574bcf5660f062c2c95288feec7e476d3e157"},"schema_version":"1.0","source":{"id":"1710.03352","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1710.03352","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"arxiv_version","alias_value":"1710.03352v1","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1710.03352","created_at":"2026-05-18T00:33:12Z"},{"alias_kind":"pith_short_12","alias_value":"HCNY7YD44UPO","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_16","alias_value":"HCNY7YD44UPODZUM","created_at":"2026-05-18T12:31:18Z"},{"alias_kind":"pith_short_8","alias_value":"HCNY7YD4","created_at":"2026-05-18T12:31:18Z"}],"graph_snapshots":[{"event_id":"sha256:ae00453ea8b37a0ad205f106976878ca3fcff1b6241699defea30395e8fddf7f","target":"graph","created_at":"2026-05-18T00:33:12Z","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":"This research started with an algebra for reasoning about rely/guarantee concurrency for a shared memory model. The approach taken led to a more abstract algebra of atomic steps, in which atomic steps synchronise (rather than interleave) when composed in parallel. The algebra of rely/guarantee concurrency then becomes an instantiation of the more abstract algebra. Many of the core properties needed for rely/guarantee reasoning can be shown to hold in the abstract algebra where their proofs are simpler and hence allow a higher degree of automation. The algebra has been encoded in Isabelle/HOL t","authors_text":"Ian J. Hayes, Kirsten Winter, Larissa A. Meinicke, Robert J. Colvin","cross_cats":["cs.SE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2017-10-09T23:48:19Z","title":"A synchronous program algebra: a basis for reasoning about shared-memory and event-based concurrency"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1710.03352","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":"sha256:99c0b1ca56825cffb15aed63e565d3e78ebe6cd97209002c528de83804e38633","target":"record","created_at":"2026-05-18T00:33:12Z","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":"280c205bb68d749eacc6ca5a0609408a5da1354f10a53a14518a2204ba658f98","cross_cats_sorted":["cs.SE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.LO","submitted_at":"2017-10-09T23:48:19Z","title_canon_sha256":"641f8ac600d6e21d8e196f468f5574bcf5660f062c2c95288feec7e476d3e157"},"schema_version":"1.0","source":{"id":"1710.03352","kind":"arxiv","version":1}},"canonical_sha256":"389b8fe07ce51ee1e68c1d233bc47166c718c0dc0cfc91d6464ef79134b3c3b7","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"389b8fe07ce51ee1e68c1d233bc47166c718c0dc0cfc91d6464ef79134b3c3b7","first_computed_at":"2026-05-18T00:33:12.297337Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:33:12.297337Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"lCHWzhtrNtxJeOu07dbQx/9WogHto2Q4O2yDQKJ9o6gdSa+vtrjdt7BWnEYGKnNCNdYusTczjy/1gP/65IgpDg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:33:12.298023Z","signed_message":"canonical_sha256_bytes"},"source_id":"1710.03352","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:99c0b1ca56825cffb15aed63e565d3e78ebe6cd97209002c528de83804e38633","sha256:ae00453ea8b37a0ad205f106976878ca3fcff1b6241699defea30395e8fddf7f"],"state_sha256":"d468b3a2e8d525065cd4b4ec861ad75261d3bd486bb864593cc9af00289dd706"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"7vLSFUWQYjPxUxpwQ87MwUtRKnxzfHwjlIUncNA9ah9iGyG24uR4xEiU96485d/+qHbNpUOLV4GdPdXAR7HgBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T19:12:41.798795Z","bundle_sha256":"a9707a7c87eabff590edd5231e120e9ff1c2134d2be67c061e3937a5bd5c2ae2"}}