{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:HNXIDU52C454X4POIC33HUTUNW","short_pith_number":"pith:HNXIDU52","canonical_record":{"source":{"id":"2506.02182","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.PL","submitted_at":"2025-06-02T19:11:46Z","cross_cats_sorted":[],"title_canon_sha256":"828344f06e1f3205a9b8a00aff65ef12ad6ade0620878edfecd0db79a6c805a0","abstract_canon_sha256":"ed61861bbe685f16fc3133dd17a9a13b27cbaf3efcb7028965bdd9914cd324f4"},"schema_version":"1.0"},"canonical_sha256":"3b6e81d3ba173bcbf1ee40b7b3d2746d9673cc65c8b5427a87d70f44d37bff96","source":{"kind":"arxiv","id":"2506.02182","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.02182","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"arxiv_version","alias_value":"2506.02182v1","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.02182","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_12","alias_value":"HNXIDU52C454","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_16","alias_value":"HNXIDU52C454X4PO","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_8","alias_value":"HNXIDU52","created_at":"2026-07-05T11:14:33Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:HNXIDU52C454X4POIC33HUTUNW","target":"record","payload":{"canonical_record":{"source":{"id":"2506.02182","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.PL","submitted_at":"2025-06-02T19:11:46Z","cross_cats_sorted":[],"title_canon_sha256":"828344f06e1f3205a9b8a00aff65ef12ad6ade0620878edfecd0db79a6c805a0","abstract_canon_sha256":"ed61861bbe685f16fc3133dd17a9a13b27cbaf3efcb7028965bdd9914cd324f4"},"schema_version":"1.0"},"canonical_sha256":"3b6e81d3ba173bcbf1ee40b7b3d2746d9673cc65c8b5427a87d70f44d37bff96","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T11:14:33.881216Z","signature_b64":"8wsCQxuQB5hfZn3RMwnOfu6ipFV0hRYRD9kHtIKA2lkOFBtO5JY18ShpdbJyzU3jaeHqOZfCs04KZCWXOcsqCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3b6e81d3ba173bcbf1ee40b7b3d2746d9673cc65c8b5427a87d70f44d37bff96","last_reissued_at":"2026-07-05T11:14:33.880703Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T11:14:33.880703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2506.02182","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":"2026-07-05T11:14:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"I+ckNzDUduBlk+o+i1fNtQYNN0xstxYmaEdJsqug3z4EtB+rUPwR02Z/BiCRYBJXAPPe203Dx+pF7Fse3n2SDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T12:53:14.302482Z"},"content_sha256":"d1369a6a8c0dbe1aad5a20ea1deaaa9d237843ab7ad3b9ae6dff8a980b909162","schema_version":"1.0","event_id":"sha256:d1369a6a8c0dbe1aad5a20ea1deaaa9d237843ab7ad3b9ae6dff8a980b909162"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:HNXIDU52C454X4POIC33HUTUNW","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spegion: Implicit and Non-Lexical Regions with Sized Allocations","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.PL","authors_text":"Jack Hughes, Mark Batty, Michael Vollmer","submitted_at":"2025-06-02T19:11:46Z","abstract_excerpt":"Region based memory management is a powerful tool designed with the goal of ensuring memory safety statically. The region calculus of Tofte and Talpin is a well known example of a region based system, which uses regions to manage memory in a stack-like fashion. However, the region calculus is lexically scoped and requires explicit annotation of memory regions, which can be cumbersome for the programmer. Other systems have addressed non-lexical regions, but these approaches typically require the use of a substructural type system to track the lifetimes of regions. We present Spegion, a language"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.02182","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/2506.02182/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":"2026-07-05T11:14:33Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QIQ2yZjNDFJ2rnjBJPAXQ0aYS9GL0GQgNztGK/krTFCAKhpqIufoPJMEKbl4oJ4aT8/1t68FrLeNqDEi9nj7Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T12:53:14.303376Z"},"content_sha256":"0dd3a3989fa8ae1657656282cadf4ca861865f4bb08083f47fe3ae52378dba7c","schema_version":"1.0","event_id":"sha256:0dd3a3989fa8ae1657656282cadf4ca861865f4bb08083f47fe3ae52378dba7c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HNXIDU52C454X4POIC33HUTUNW/bundle.json","state_url":"https://pith.science/pith/HNXIDU52C454X4POIC33HUTUNW/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HNXIDU52C454X4POIC33HUTUNW/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":"2026-08-08T12:53:14Z","links":{"resolver":"https://pith.science/pith/HNXIDU52C454X4POIC33HUTUNW","bundle":"https://pith.science/pith/HNXIDU52C454X4POIC33HUTUNW/bundle.json","state":"https://pith.science/pith/HNXIDU52C454X4POIC33HUTUNW/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HNXIDU52C454X4POIC33HUTUNW/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:HNXIDU52C454X4POIC33HUTUNW","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":"ed61861bbe685f16fc3133dd17a9a13b27cbaf3efcb7028965bdd9914cd324f4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.PL","submitted_at":"2025-06-02T19:11:46Z","title_canon_sha256":"828344f06e1f3205a9b8a00aff65ef12ad6ade0620878edfecd0db79a6c805a0"},"schema_version":"1.0","source":{"id":"2506.02182","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2506.02182","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"arxiv_version","alias_value":"2506.02182v1","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.02182","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_12","alias_value":"HNXIDU52C454","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_16","alias_value":"HNXIDU52C454X4PO","created_at":"2026-07-05T11:14:33Z"},{"alias_kind":"pith_short_8","alias_value":"HNXIDU52","created_at":"2026-07-05T11:14:33Z"}],"graph_snapshots":[{"event_id":"sha256:0dd3a3989fa8ae1657656282cadf4ca861865f4bb08083f47fe3ae52378dba7c","target":"graph","created_at":"2026-07-05T11:14:33Z","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/2506.02182/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Region based memory management is a powerful tool designed with the goal of ensuring memory safety statically. The region calculus of Tofte and Talpin is a well known example of a region based system, which uses regions to manage memory in a stack-like fashion. However, the region calculus is lexically scoped and requires explicit annotation of memory regions, which can be cumbersome for the programmer. Other systems have addressed non-lexical regions, but these approaches typically require the use of a substructural type system to track the lifetimes of regions. We present Spegion, a language","authors_text":"Jack Hughes, Mark Batty, Michael Vollmer","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.PL","submitted_at":"2025-06-02T19:11:46Z","title":"Spegion: Implicit and Non-Lexical Regions with Sized Allocations"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.02182","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:d1369a6a8c0dbe1aad5a20ea1deaaa9d237843ab7ad3b9ae6dff8a980b909162","target":"record","created_at":"2026-07-05T11:14:33Z","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":"ed61861bbe685f16fc3133dd17a9a13b27cbaf3efcb7028965bdd9914cd324f4","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.PL","submitted_at":"2025-06-02T19:11:46Z","title_canon_sha256":"828344f06e1f3205a9b8a00aff65ef12ad6ade0620878edfecd0db79a6c805a0"},"schema_version":"1.0","source":{"id":"2506.02182","kind":"arxiv","version":1}},"canonical_sha256":"3b6e81d3ba173bcbf1ee40b7b3d2746d9673cc65c8b5427a87d70f44d37bff96","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3b6e81d3ba173bcbf1ee40b7b3d2746d9673cc65c8b5427a87d70f44d37bff96","first_computed_at":"2026-07-05T11:14:33.880703Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T11:14:33.880703Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"8wsCQxuQB5hfZn3RMwnOfu6ipFV0hRYRD9kHtIKA2lkOFBtO5JY18ShpdbJyzU3jaeHqOZfCs04KZCWXOcsqCg==","signature_status":"signed_v1","signed_at":"2026-07-05T11:14:33.881216Z","signed_message":"canonical_sha256_bytes"},"source_id":"2506.02182","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d1369a6a8c0dbe1aad5a20ea1deaaa9d237843ab7ad3b9ae6dff8a980b909162","sha256:0dd3a3989fa8ae1657656282cadf4ca861865f4bb08083f47fe3ae52378dba7c"],"state_sha256":"3d6aa0e022d6615e548d29df7d3ed2393b592c8074b1738e8a9fbdfa986b83cf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"90BNQIGp+6NgDFOTItQ207OJjOlKoYSIwPobOYX3akcwmrW1sW8YyDJIN8nLwKQilKegtyXvDddOQmdoc72HDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T12:53:14.309599Z","bundle_sha256":"e252734c348a1c14acac397e05802c937ebea851308fce80a83a4c8ed674c33d"}}