{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:6LWKA5NIX6JCUZCGRHDN46XWA4","short_pith_number":"pith:6LWKA5NI","canonical_record":{"source":{"id":"2504.20251","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-04-28T20:43:40Z","cross_cats_sorted":["cs.AI","cs.CY"],"title_canon_sha256":"bc2a2f26e076f3f647d9b899ed87da55f77807d015e71f2142b8568f4f314f1c","abstract_canon_sha256":"de3cd12a02f4ebc01d0a0e604b7e3afca0c19644e66531c887ece87f42ceb616"},"schema_version":"1.0"},"canonical_sha256":"f2eca075a8bf922a644689c6de7af6070a8007e98c171d06f705bc4030746a1e","source":{"kind":"arxiv","id":"2504.20251","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20251","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20251v1","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20251","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"6LWKA5NIX6JC","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_16","alias_value":"6LWKA5NIX6JCUZCG","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_8","alias_value":"6LWKA5NI","created_at":"2026-07-05T10:55:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:6LWKA5NIX6JCUZCGRHDN46XWA4","target":"record","payload":{"canonical_record":{"source":{"id":"2504.20251","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-04-28T20:43:40Z","cross_cats_sorted":["cs.AI","cs.CY"],"title_canon_sha256":"bc2a2f26e076f3f647d9b899ed87da55f77807d015e71f2142b8568f4f314f1c","abstract_canon_sha256":"de3cd12a02f4ebc01d0a0e604b7e3afca0c19644e66531c887ece87f42ceb616"},"schema_version":"1.0"},"canonical_sha256":"f2eca075a8bf922a644689c6de7af6070a8007e98c171d06f705bc4030746a1e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T10:55:39.204451Z","signature_b64":"v8zewxUCffrFrKo9xMY7DlUjxSc2dNWPpWz28sbfLtjWtZQcUYjNGHWQ7ear49Ix0ZM3/VkCotp7L7F89rNWBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f2eca075a8bf922a644689c6de7af6070a8007e98c171d06f705bc4030746a1e","last_reissued_at":"2026-07-05T10:55:39.204004Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T10:55:39.204004Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2504.20251","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":"2026-07-05T10:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"T8N75fBSFw+W73kYiZDn+9reOrdkPs5zVk2xAWNiwB+3ya3WitUmr0cMgSP7jKiO5XsY8SzpaE0ytZfVIgaqBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T05:11:43.247392Z"},"content_sha256":"f90ef650504513c8e9e32b04f49b3a3ce03f3cc71d10be7c1f6e6f378a5477de","schema_version":"1.0","event_id":"sha256:f90ef650504513c8e9e32b04f49b3a3ce03f3cc71d10be7c1f6e6f378a5477de"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:6LWKA5NIX6JCUZCGRHDN46XWA4","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Platform for Generating Educational Activities to Teach English as a Second Language","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.CY"],"primary_cat":"cs.CL","authors_text":"Aiala Ros\\'a, Brian Carpenter, Ignacio Sastre, Juan Pablo Filevich, Laura Musto, Luis Chiruzzo, Santiago G\\'ongora","submitted_at":"2025-04-28T20:43:40Z","abstract_excerpt":"We present a platform for the generation of educational activities oriented to teaching English as a foreign language. The different activities -- games and language practice exercises -- are strongly based on Natural Language Processing techniques. The platform offers the possibility of playing out-of-the-box games, generated from resources created semi-automatically and then manually curated. It can also generate games or exercises of greater complexity from texts entered by teachers, providing a stage of review and edition of the generated content before use. As a way of expanding the varie"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20251","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/2504.20251/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":"2026-07-05T10:55:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"m+DNzc5nEpKQdVc8/e8t0O2YDoX4dh0WQ+at1PpzILruMwMAo9cStHrfTiupUjslBCg9VPa+SL5dx7M21cMZCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-08T05:11:43.247898Z"},"content_sha256":"52b4984f3ac93f18091a51face22e7576128d1cc4c175fcf79bd61f7dc447292","schema_version":"1.0","event_id":"sha256:52b4984f3ac93f18091a51face22e7576128d1cc4c175fcf79bd61f7dc447292"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/bundle.json","state_url":"https://pith.science/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/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":"2026-08-08T05:11:43Z","links":{"resolver":"https://pith.science/pith/6LWKA5NIX6JCUZCGRHDN46XWA4","bundle":"https://pith.science/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/bundle.json","state":"https://pith.science/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/state.json","well_known_bundle":"https://pith.science/.well-known/pith/6LWKA5NIX6JCUZCGRHDN46XWA4/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:6LWKA5NIX6JCUZCGRHDN46XWA4","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":"de3cd12a02f4ebc01d0a0e604b7e3afca0c19644e66531c887ece87f42ceb616","cross_cats_sorted":["cs.AI","cs.CY"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-04-28T20:43:40Z","title_canon_sha256":"bc2a2f26e076f3f647d9b899ed87da55f77807d015e71f2142b8568f4f314f1c"},"schema_version":"1.0","source":{"id":"2504.20251","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2504.20251","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"arxiv_version","alias_value":"2504.20251v1","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2504.20251","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_12","alias_value":"6LWKA5NIX6JC","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_16","alias_value":"6LWKA5NIX6JCUZCG","created_at":"2026-07-05T10:55:39Z"},{"alias_kind":"pith_short_8","alias_value":"6LWKA5NI","created_at":"2026-07-05T10:55:39Z"}],"graph_snapshots":[{"event_id":"sha256:52b4984f3ac93f18091a51face22e7576128d1cc4c175fcf79bd61f7dc447292","target":"graph","created_at":"2026-07-05T10:55:39Z","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/2504.20251/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a platform for the generation of educational activities oriented to teaching English as a foreign language. The different activities -- games and language practice exercises -- are strongly based on Natural Language Processing techniques. The platform offers the possibility of playing out-of-the-box games, generated from resources created semi-automatically and then manually curated. It can also generate games or exercises of greater complexity from texts entered by teachers, providing a stage of review and edition of the generated content before use. As a way of expanding the varie","authors_text":"Aiala Ros\\'a, Brian Carpenter, Ignacio Sastre, Juan Pablo Filevich, Laura Musto, Luis Chiruzzo, Santiago G\\'ongora","cross_cats":["cs.AI","cs.CY"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-04-28T20:43:40Z","title":"A Platform for Generating Educational Activities to Teach English as a Second Language"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2504.20251","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:f90ef650504513c8e9e32b04f49b3a3ce03f3cc71d10be7c1f6e6f378a5477de","target":"record","created_at":"2026-07-05T10:55:39Z","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":"de3cd12a02f4ebc01d0a0e604b7e3afca0c19644e66531c887ece87f42ceb616","cross_cats_sorted":["cs.AI","cs.CY"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2025-04-28T20:43:40Z","title_canon_sha256":"bc2a2f26e076f3f647d9b899ed87da55f77807d015e71f2142b8568f4f314f1c"},"schema_version":"1.0","source":{"id":"2504.20251","kind":"arxiv","version":1}},"canonical_sha256":"f2eca075a8bf922a644689c6de7af6070a8007e98c171d06f705bc4030746a1e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f2eca075a8bf922a644689c6de7af6070a8007e98c171d06f705bc4030746a1e","first_computed_at":"2026-07-05T10:55:39.204004Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T10:55:39.204004Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v8zewxUCffrFrKo9xMY7DlUjxSc2dNWPpWz28sbfLtjWtZQcUYjNGHWQ7ear49Ix0ZM3/VkCotp7L7F89rNWBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T10:55:39.204451Z","signed_message":"canonical_sha256_bytes"},"source_id":"2504.20251","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f90ef650504513c8e9e32b04f49b3a3ce03f3cc71d10be7c1f6e6f378a5477de","sha256:52b4984f3ac93f18091a51face22e7576128d1cc4c175fcf79bd61f7dc447292"],"state_sha256":"0f32e5f007b5ae839bf20e1827058666ce585d80a68a7b124e6281bd95156135"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pEEE79aYXKCBQJpUnXvIORNDOl2v/m4n+1KfL4HwuvP+QcTooI6/bjla8/6jA61zQX2rKwPJiSZ3JXI5TEYiBQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-08T05:11:43.251791Z","bundle_sha256":"d6bf6b8cc6c63f7db4f9528d04f4d59bf695ff3f1c0acf95e458da80633bfb5f"}}