{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:UEHIQ6KZK46TFAAQOIG2GHLJIW","short_pith_number":"pith:UEHIQ6KZ","canonical_record":{"source":{"id":"2109.04635","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LO","submitted_at":"2021-09-10T02:43:28Z","cross_cats_sorted":["cs.SC"],"title_canon_sha256":"d233a010dd7e0275456a34462927c1ba4df67a95384b424ca96274a02e0e3b97","abstract_canon_sha256":"d108da41ee60f7580c73ec71952f81bee6a349f398ab6f9c508e06f9f825ada3"},"schema_version":"1.0"},"canonical_sha256":"a10e887959573d328010720da31d69458d40c0e1e57dbf738a61b5398904131f","source":{"kind":"arxiv","id":"2109.04635","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.04635","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"arxiv_version","alias_value":"2109.04635v1","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.04635","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_12","alias_value":"UEHIQ6KZK46T","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_16","alias_value":"UEHIQ6KZK46TFAAQ","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_8","alias_value":"UEHIQ6KZ","created_at":"2026-07-05T03:13:08Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:UEHIQ6KZK46TFAAQOIG2GHLJIW","target":"record","payload":{"canonical_record":{"source":{"id":"2109.04635","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LO","submitted_at":"2021-09-10T02:43:28Z","cross_cats_sorted":["cs.SC"],"title_canon_sha256":"d233a010dd7e0275456a34462927c1ba4df67a95384b424ca96274a02e0e3b97","abstract_canon_sha256":"d108da41ee60f7580c73ec71952f81bee6a349f398ab6f9c508e06f9f825ada3"},"schema_version":"1.0"},"canonical_sha256":"a10e887959573d328010720da31d69458d40c0e1e57dbf738a61b5398904131f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T03:13:08.150386Z","signature_b64":"xdxD37oUGEuxcNixvXd6p9m808Icv/agQ3rNG9CmUxuJGgvRB+9sGzVdfPk6YoDJ4/2JsmspH4SHLr2BZ7VkBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"a10e887959573d328010720da31d69458d40c0e1e57dbf738a61b5398904131f","last_reissued_at":"2026-07-05T03:13:08.149851Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T03:13:08.149851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2109.04635","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":"2026-07-05T03:13:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"aJW/H8w+s6jpa5AE1x4F7n5N7qejXZp6NlFyVsvE6Fp1vFEa5ygYMmXEG+BDykpC76/rmTw+Ni/LqrVW80/fBg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T15:42:03.490290Z"},"content_sha256":"cc8c7c568c8b0c9badc0415016acc0da2990c66d1c9bc144624e9736ff13238b","schema_version":"1.0","event_id":"sha256:cc8c7c568c8b0c9badc0415016acc0da2990c66d1c9bc144624e9736ff13238b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:UEHIQ6KZK46TFAAQOIG2GHLJIW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Competition Report: CHC-COMP-21","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.SC"],"primary_cat":"cs.LO","authors_text":"Grigory Fedyukovich (Florida State University, Philipp R\\\"ummer (Uppsala University, Sweden), USA)","submitted_at":"2021-09-10T02:43:28Z","abstract_excerpt":"CHC-COMP-21 is the fourth competition of solvers for Constrained Horn Clauses. In this year, 7 solvers participated at the competition, and were evaluated in 7 separate tracks on problems in linear integer arithmetic, linear real arithmetic, arrays, and algebraic data-types. The competition was run in March 2021 using the StarExec computing cluster. This report gives an overview of the competition design, explains the organisation of the competition, and presents the competition results."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.04635","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/2109.04635/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":"2026-07-05T03:13:08Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"J6BPGQTMCZj0qDA9Wi0CL7z67gh9ku7/YzyATySP57mITFH5rjS+VOdT2YOMsWzRinG4WJSFQy/f86yhTVO3Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-23T15:42:03.490722Z"},"content_sha256":"ceeb3147c21053e11e616cf97f5d55cc47110223aee082fb62eddade8fbb1401","schema_version":"1.0","event_id":"sha256:ceeb3147c21053e11e616cf97f5d55cc47110223aee082fb62eddade8fbb1401"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/bundle.json","state_url":"https://pith.science/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/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":"2026-08-23T15:42:03Z","links":{"resolver":"https://pith.science/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW","bundle":"https://pith.science/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/bundle.json","state":"https://pith.science/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/UEHIQ6KZK46TFAAQOIG2GHLJIW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:UEHIQ6KZK46TFAAQOIG2GHLJIW","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":"d108da41ee60f7580c73ec71952f81bee6a349f398ab6f9c508e06f9f825ada3","cross_cats_sorted":["cs.SC"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LO","submitted_at":"2021-09-10T02:43:28Z","title_canon_sha256":"d233a010dd7e0275456a34462927c1ba4df67a95384b424ca96274a02e0e3b97"},"schema_version":"1.0","source":{"id":"2109.04635","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2109.04635","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"arxiv_version","alias_value":"2109.04635v1","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2109.04635","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_12","alias_value":"UEHIQ6KZK46T","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_16","alias_value":"UEHIQ6KZK46TFAAQ","created_at":"2026-07-05T03:13:08Z"},{"alias_kind":"pith_short_8","alias_value":"UEHIQ6KZ","created_at":"2026-07-05T03:13:08Z"}],"graph_snapshots":[{"event_id":"sha256:ceeb3147c21053e11e616cf97f5d55cc47110223aee082fb62eddade8fbb1401","target":"graph","created_at":"2026-07-05T03:13:08Z","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/2109.04635/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"CHC-COMP-21 is the fourth competition of solvers for Constrained Horn Clauses. In this year, 7 solvers participated at the competition, and were evaluated in 7 separate tracks on problems in linear integer arithmetic, linear real arithmetic, arrays, and algebraic data-types. The competition was run in March 2021 using the StarExec computing cluster. This report gives an overview of the competition design, explains the organisation of the competition, and presents the competition results.","authors_text":"Grigory Fedyukovich (Florida State University, Philipp R\\\"ummer (Uppsala University, Sweden), USA)","cross_cats":["cs.SC"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LO","submitted_at":"2021-09-10T02:43:28Z","title":"Competition Report: CHC-COMP-21"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2109.04635","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:cc8c7c568c8b0c9badc0415016acc0da2990c66d1c9bc144624e9736ff13238b","target":"record","created_at":"2026-07-05T03:13:08Z","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":"d108da41ee60f7580c73ec71952f81bee6a349f398ab6f9c508e06f9f825ada3","cross_cats_sorted":["cs.SC"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.LO","submitted_at":"2021-09-10T02:43:28Z","title_canon_sha256":"d233a010dd7e0275456a34462927c1ba4df67a95384b424ca96274a02e0e3b97"},"schema_version":"1.0","source":{"id":"2109.04635","kind":"arxiv","version":1}},"canonical_sha256":"a10e887959573d328010720da31d69458d40c0e1e57dbf738a61b5398904131f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"a10e887959573d328010720da31d69458d40c0e1e57dbf738a61b5398904131f","first_computed_at":"2026-07-05T03:13:08.149851Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:13:08.149851Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"xdxD37oUGEuxcNixvXd6p9m808Icv/agQ3rNG9CmUxuJGgvRB+9sGzVdfPk6YoDJ4/2JsmspH4SHLr2BZ7VkBA==","signature_status":"signed_v1","signed_at":"2026-07-05T03:13:08.150386Z","signed_message":"canonical_sha256_bytes"},"source_id":"2109.04635","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc8c7c568c8b0c9badc0415016acc0da2990c66d1c9bc144624e9736ff13238b","sha256:ceeb3147c21053e11e616cf97f5d55cc47110223aee082fb62eddade8fbb1401"],"state_sha256":"af0acb3a590cedcdac2fc849e05a4a97104efbdf560417822d50bccdc0cb345e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PCzsMsxJltg50TjGNFLMoWk3p+MHvnkV2tJRXN0yBiVqYwaKgORvdVbmtOoQ6DCIjc6gJbhLpYfYw07h9CQlAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-23T15:42:03.494330Z","bundle_sha256":"0bfff411d9fc42bd2472a87a5eb0d44ccdf942d64c4638d304874b8e7aa56625"}}