{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2024:YHLEN4EEZI2OLD4QWN7IUQTHXU","short_pith_number":"pith:YHLEN4EE","canonical_record":{"source":{"id":"2405.06233","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.PL","submitted_at":"2024-05-10T04:00:48Z","cross_cats_sorted":[],"title_canon_sha256":"93c4328c02ea914c87f3e1bb1d66dce2e9142960a16a441f8e3d1b8ddc359db7","abstract_canon_sha256":"3af1761fa9f625847c4998f1ce0c275671a8fe45184c1e0d4e48f9a221e657de"},"schema_version":"1.0"},"canonical_sha256":"c1d646f084ca34e58f90b37e8a4267bd157f9b02e80956782509c6d9ccdc9837","source":{"kind":"arxiv","id":"2405.06233","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2405.06233","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"arxiv_version","alias_value":"2405.06233v2","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2405.06233","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_12","alias_value":"YHLEN4EEZI2O","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_16","alias_value":"YHLEN4EEZI2OLD4Q","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_8","alias_value":"YHLEN4EE","created_at":"2026-07-05T08:18:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2024:YHLEN4EEZI2OLD4QWN7IUQTHXU","target":"record","payload":{"canonical_record":{"source":{"id":"2405.06233","kind":"arxiv","version":2},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.PL","submitted_at":"2024-05-10T04:00:48Z","cross_cats_sorted":[],"title_canon_sha256":"93c4328c02ea914c87f3e1bb1d66dce2e9142960a16a441f8e3d1b8ddc359db7","abstract_canon_sha256":"3af1761fa9f625847c4998f1ce0c275671a8fe45184c1e0d4e48f9a221e657de"},"schema_version":"1.0"},"canonical_sha256":"c1d646f084ca34e58f90b37e8a4267bd157f9b02e80956782509c6d9ccdc9837","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T08:18:09.254276Z","signature_b64":"vxyVW8zsNPBe21x9fx5wCcI1dJs3CHN+QS5dvmCfGJyCYBOwhOoqmnqXUsqv7/6kxW3zs7AmEvUZCcUvsGH1CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1d646f084ca34e58f90b37e8a4267bd157f9b02e80956782509c6d9ccdc9837","last_reissued_at":"2026-07-05T08:18:09.253785Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T08:18:09.253785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2405.06233","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":"2026-07-05T08:18:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"tefyY/QCoh5hbLItwIdHVEsYMHfiHqmYcp2mmy0ZZc1glQ64G61zIOYz76JcK0KQd4qA1JmKQOw87nFoU4pVAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:54:42.052915Z"},"content_sha256":"13bac5ed843be5ec3b94cc1461489def8dd6e3590c7be4ece5bbcd1690073fe7","schema_version":"1.0","event_id":"sha256:13bac5ed843be5ec3b94cc1461489def8dd6e3590c7be4ece5bbcd1690073fe7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2024:YHLEN4EEZI2OLD4QWN7IUQTHXU","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Fearless Journey [Draft]","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":[],"primary_cat":"cs.PL","authors_text":"Marco Servetto, Michael Homer, Nick Webster","submitted_at":"2024-05-10T04:00:48Z","abstract_excerpt":"Existing minimal Object-Oriented models (OO), like Featherweight Java (FJ), are valuable for modelling programs and designing new programming languages and tools. However, their utility in developing real-world programs is limited. We introduce the 'Fearless Heart', a novel object calculus preserving FJ's minimal and extensible nature while being more suited for constructing complex, real-world applications.\n  To illustrate the extensibility of the Fearless Heart, we extend it with Reference Capabilities (RC), creating R-Fearless. It supports mutability and other side effects while retaining t"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2405.06233","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/2405.06233/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":"2026-07-05T08:18:09Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"hIg+IYRjD9/DBtmv1a7HhcCsWJWTekA0lIiZuDJScsngptgVp1XdGf/aDqvqkeOhmY60mwqcUD7T0sYzvxPqDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-09T06:54:42.053311Z"},"content_sha256":"4e64ad844d36c2c58e4fc6cd990668775dfacf45434bddcaff9d585eead3ba13","schema_version":"1.0","event_id":"sha256:4e64ad844d36c2c58e4fc6cd990668775dfacf45434bddcaff9d585eead3ba13"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/bundle.json","state_url":"https://pith.science/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/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":"2026-07-09T06:54:42Z","links":{"resolver":"https://pith.science/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU","bundle":"https://pith.science/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/bundle.json","state":"https://pith.science/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YHLEN4EEZI2OLD4QWN7IUQTHXU/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:YHLEN4EEZI2OLD4QWN7IUQTHXU","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":"3af1761fa9f625847c4998f1ce0c275671a8fe45184c1e0d4e48f9a221e657de","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.PL","submitted_at":"2024-05-10T04:00:48Z","title_canon_sha256":"93c4328c02ea914c87f3e1bb1d66dce2e9142960a16a441f8e3d1b8ddc359db7"},"schema_version":"1.0","source":{"id":"2405.06233","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2405.06233","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"arxiv_version","alias_value":"2405.06233v2","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2405.06233","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_12","alias_value":"YHLEN4EEZI2O","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_16","alias_value":"YHLEN4EEZI2OLD4Q","created_at":"2026-07-05T08:18:09Z"},{"alias_kind":"pith_short_8","alias_value":"YHLEN4EE","created_at":"2026-07-05T08:18:09Z"}],"graph_snapshots":[{"event_id":"sha256:4e64ad844d36c2c58e4fc6cd990668775dfacf45434bddcaff9d585eead3ba13","target":"graph","created_at":"2026-07-05T08:18:09Z","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/2405.06233/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Existing minimal Object-Oriented models (OO), like Featherweight Java (FJ), are valuable for modelling programs and designing new programming languages and tools. However, their utility in developing real-world programs is limited. We introduce the 'Fearless Heart', a novel object calculus preserving FJ's minimal and extensible nature while being more suited for constructing complex, real-world applications.\n  To illustrate the extensibility of the Fearless Heart, we extend it with Reference Capabilities (RC), creating R-Fearless. It supports mutability and other side effects while retaining t","authors_text":"Marco Servetto, Michael Homer, Nick Webster","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.PL","submitted_at":"2024-05-10T04:00:48Z","title":"The Fearless Journey [Draft]"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2405.06233","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":"sha256:13bac5ed843be5ec3b94cc1461489def8dd6e3590c7be4ece5bbcd1690073fe7","target":"record","created_at":"2026-07-05T08:18:09Z","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":"3af1761fa9f625847c4998f1ce0c275671a8fe45184c1e0d4e48f9a221e657de","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.PL","submitted_at":"2024-05-10T04:00:48Z","title_canon_sha256":"93c4328c02ea914c87f3e1bb1d66dce2e9142960a16a441f8e3d1b8ddc359db7"},"schema_version":"1.0","source":{"id":"2405.06233","kind":"arxiv","version":2}},"canonical_sha256":"c1d646f084ca34e58f90b37e8a4267bd157f9b02e80956782509c6d9ccdc9837","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c1d646f084ca34e58f90b37e8a4267bd157f9b02e80956782509c6d9ccdc9837","first_computed_at":"2026-07-05T08:18:09.253785Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T08:18:09.253785Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"vxyVW8zsNPBe21x9fx5wCcI1dJs3CHN+QS5dvmCfGJyCYBOwhOoqmnqXUsqv7/6kxW3zs7AmEvUZCcUvsGH1CQ==","signature_status":"signed_v1","signed_at":"2026-07-05T08:18:09.254276Z","signed_message":"canonical_sha256_bytes"},"source_id":"2405.06233","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:13bac5ed843be5ec3b94cc1461489def8dd6e3590c7be4ece5bbcd1690073fe7","sha256:4e64ad844d36c2c58e4fc6cd990668775dfacf45434bddcaff9d585eead3ba13"],"state_sha256":"096c6d3f6d972ac3091077610a7817633901faab66d8aa4352d6037bc55a4dfb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NKQUGL9EBt8MzUbWEHk0Ozh7ydRdiRyDLVWg8/MEVxztXqKGi5XJvOqSa8uBY8UcLU7luUYR8BQrjhoS0d6CBg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-09T06:54:42.055886Z","bundle_sha256":"876211928d0d930f6ec556c7a00fb7603a1a20fb7e6ad67981123a61ddc312e5"}}