{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SXQCGP7OSBUSA7FZTAU5XOYE3C","short_pith_number":"pith:SXQCGP7O","canonical_record":{"source":{"id":"2605.23103","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-05-21T23:40:51Z","cross_cats_sorted":["cs.AI","cs.CY","cs.DB"],"title_canon_sha256":"dc86a0e54cd90da6161dc48e63d076ff6353c5bd945a668437d42909e023f5df","abstract_canon_sha256":"5ac3efc0775e9844a240c9faaa23a342d111e003f1aef11de401b16e6d8a0a7b"},"schema_version":"1.0"},"canonical_sha256":"95e0233fee9069207cb99829dbbb04d8a772c0584e5efad60980989fdf0cd04f","source":{"kind":"arxiv","id":"2605.23103","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.23103","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"2605.23103v1","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.23103","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"SXQCGP7OSBUS","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_16","alias_value":"SXQCGP7OSBUSA7FZ","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_8","alias_value":"SXQCGP7O","created_at":"2026-05-25T02:01:38Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SXQCGP7OSBUSA7FZTAU5XOYE3C","target":"record","payload":{"canonical_record":{"source":{"id":"2605.23103","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-05-21T23:40:51Z","cross_cats_sorted":["cs.AI","cs.CY","cs.DB"],"title_canon_sha256":"dc86a0e54cd90da6161dc48e63d076ff6353c5bd945a668437d42909e023f5df","abstract_canon_sha256":"5ac3efc0775e9844a240c9faaa23a342d111e003f1aef11de401b16e6d8a0a7b"},"schema_version":"1.0"},"canonical_sha256":"95e0233fee9069207cb99829dbbb04d8a772c0584e5efad60980989fdf0cd04f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-25T02:01:38.273895Z","signature_b64":"LYYiXcV5oORueKm8PaN9KBq4kAsNS5yCxIaGfvi8wtCO6G392E1rzF55WzWJOwak/kyiWx9izALsKgEOcdwkDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"95e0233fee9069207cb99829dbbb04d8a772c0584e5efad60980989fdf0cd04f","last_reissued_at":"2026-05-25T02:01:38.273211Z","signature_status":"signed_v1","first_computed_at":"2026-05-25T02:01:38.273211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2605.23103","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":"2026-05-25T02:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"uHJCWAgHe4cilV0rJyrdBWiKFjrsTuyTHhRGpCZWj7o2CgB1hJaY8lruZiwBWFZ8vjg14bqiyEVUsXr1juwkDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:27:34.558171Z"},"content_sha256":"cc02278408f7fcc688ccece57768d528abeaf96d08fc8b873bcf7aa5c2ed3aaf","schema_version":"1.0","event_id":"sha256:cc02278408f7fcc688ccece57768d528abeaf96d08fc8b873bcf7aa5c2ed3aaf"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SXQCGP7OSBUSA7FZTAU5XOYE3C","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A Fine-Tuned BERT Classifier for Personal-Letter Titles in Late-Ming and Early-Qing Collected Works","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["cs.AI","cs.CY","cs.DB"],"primary_cat":"cs.CL","authors_text":"Queenie Luo","submitted_at":"2026-05-21T23:40:51Z","abstract_excerpt":"I present Lepton (Letter Prediction), a fine-tuned BERT classifier that predicts whether a title in a Classical Chinese wenji table of contents is a personal letter or a closely confusable preface (particularly the farewell-preface). Lepton fine-tunes bert-base-chinese on 5438 hand-labeled wenji titles from thirty-three late-Ming and early-Qing literati. I've deployed the model on Hugging Face and has been used at the China Biographical Database (CBDB) to identify approximately fifty-five thousand letters across mid-Ming through early-Qing wenji, populating the Ming Letter Platform."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.23103","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/2605.23103/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":"2026-05-25T02:01:38Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/I55VVh6F7evoff4Czmtn4CwZ8E6ukJ4gXmldjH/NFTUJj3+Hog5++VzOfUHIfX2nyGIOy4fDByXSSdVMetcDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:27:34.558566Z"},"content_sha256":"444951641a20274c7b4ff4725ad4ffbf1d801c1e440de8e56e0d0c732ce4ab59","schema_version":"1.0","event_id":"sha256:444951641a20274c7b4ff4725ad4ffbf1d801c1e440de8e56e0d0c732ce4ab59"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/bundle.json","state_url":"https://pith.science/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/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":"2026-05-28T03:27:34Z","links":{"resolver":"https://pith.science/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C","bundle":"https://pith.science/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/bundle.json","state":"https://pith.science/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SXQCGP7OSBUSA7FZTAU5XOYE3C/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SXQCGP7OSBUSA7FZTAU5XOYE3C","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":"5ac3efc0775e9844a240c9faaa23a342d111e003f1aef11de401b16e6d8a0a7b","cross_cats_sorted":["cs.AI","cs.CY","cs.DB"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-05-21T23:40:51Z","title_canon_sha256":"dc86a0e54cd90da6161dc48e63d076ff6353c5bd945a668437d42909e023f5df"},"schema_version":"1.0","source":{"id":"2605.23103","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2605.23103","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"arxiv_version","alias_value":"2605.23103v1","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2605.23103","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_12","alias_value":"SXQCGP7OSBUS","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_16","alias_value":"SXQCGP7OSBUSA7FZ","created_at":"2026-05-25T02:01:38Z"},{"alias_kind":"pith_short_8","alias_value":"SXQCGP7O","created_at":"2026-05-25T02:01:38Z"}],"graph_snapshots":[{"event_id":"sha256:444951641a20274c7b4ff4725ad4ffbf1d801c1e440de8e56e0d0c732ce4ab59","target":"graph","created_at":"2026-05-25T02:01:38Z","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/2605.23103/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"I present Lepton (Letter Prediction), a fine-tuned BERT classifier that predicts whether a title in a Classical Chinese wenji table of contents is a personal letter or a closely confusable preface (particularly the farewell-preface). Lepton fine-tunes bert-base-chinese on 5438 hand-labeled wenji titles from thirty-three late-Ming and early-Qing literati. I've deployed the model on Hugging Face and has been used at the China Biographical Database (CBDB) to identify approximately fifty-five thousand letters across mid-Ming through early-Qing wenji, populating the Ming Letter Platform.","authors_text":"Queenie Luo","cross_cats":["cs.AI","cs.CY","cs.DB"],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-05-21T23:40:51Z","title":"A Fine-Tuned BERT Classifier for Personal-Letter Titles in Late-Ming and Early-Qing Collected Works"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2605.23103","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:cc02278408f7fcc688ccece57768d528abeaf96d08fc8b873bcf7aa5c2ed3aaf","target":"record","created_at":"2026-05-25T02:01:38Z","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":"5ac3efc0775e9844a240c9faaa23a342d111e003f1aef11de401b16e6d8a0a7b","cross_cats_sorted":["cs.AI","cs.CY","cs.DB"],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"cs.CL","submitted_at":"2026-05-21T23:40:51Z","title_canon_sha256":"dc86a0e54cd90da6161dc48e63d076ff6353c5bd945a668437d42909e023f5df"},"schema_version":"1.0","source":{"id":"2605.23103","kind":"arxiv","version":1}},"canonical_sha256":"95e0233fee9069207cb99829dbbb04d8a772c0584e5efad60980989fdf0cd04f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"95e0233fee9069207cb99829dbbb04d8a772c0584e5efad60980989fdf0cd04f","first_computed_at":"2026-05-25T02:01:38.273211Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-25T02:01:38.273211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LYYiXcV5oORueKm8PaN9KBq4kAsNS5yCxIaGfvi8wtCO6G392E1rzF55WzWJOwak/kyiWx9izALsKgEOcdwkDQ==","signature_status":"signed_v1","signed_at":"2026-05-25T02:01:38.273895Z","signed_message":"canonical_sha256_bytes"},"source_id":"2605.23103","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:cc02278408f7fcc688ccece57768d528abeaf96d08fc8b873bcf7aa5c2ed3aaf","sha256:444951641a20274c7b4ff4725ad4ffbf1d801c1e440de8e56e0d0c732ce4ab59"],"state_sha256":"cb0a14865d3a125673ccd45eceb87f1c9ebe20224fb9b8dd5c69ea1c2fc816eb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RA3izonIrEnEVfjF2Kd5h5AlHTv6hU9T8YaT+IbgSstw9c2AEonogi/obY/7da+itOf7GhfMRcoRrkTnHJEAAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T03:27:34.560595Z","bundle_sha256":"7d3214d1395f1a1124f2ea300f7d36066163164ee110b708dd96c77509ba2a73"}}