{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2025:VWINZ6JDAR767LKTU5WXWO7X3W","short_pith_number":"pith:VWINZ6JD","canonical_record":{"source":{"id":"2509.09987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2025-09-12T06:03:24Z","cross_cats_sorted":["cs.CL"],"title_canon_sha256":"c7a909cb57df89cebf74178b8914e6911ede1770ee4bc58a256e01512d74688a","abstract_canon_sha256":"0e4c7f08232a9c834105cf1bb90d10cd5a4ba8306d2b3d965298697a2a7690b4"},"schema_version":"1.0"},"canonical_sha256":"ad90dcf923047fefad53a76d7b3bf7ddbdddadf016b4ffdf2b501499932545d0","source":{"kind":"arxiv","id":"2509.09987","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.09987","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"arxiv_version","alias_value":"2509.09987v1","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.09987","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_12","alias_value":"VWINZ6JDAR76","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_16","alias_value":"VWINZ6JDAR767LKT","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_8","alias_value":"VWINZ6JD","created_at":"2026-07-05T12:09:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2025:VWINZ6JDAR767LKTU5WXWO7X3W","target":"record","payload":{"canonical_record":{"source":{"id":"2509.09987","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2025-09-12T06:03:24Z","cross_cats_sorted":["cs.CL"],"title_canon_sha256":"c7a909cb57df89cebf74178b8914e6911ede1770ee4bc58a256e01512d74688a","abstract_canon_sha256":"0e4c7f08232a9c834105cf1bb90d10cd5a4ba8306d2b3d965298697a2a7690b4"},"schema_version":"1.0"},"canonical_sha256":"ad90dcf923047fefad53a76d7b3bf7ddbdddadf016b4ffdf2b501499932545d0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:09:53.245943Z","signature_b64":"El1m5y4Fd6ELrxAtZey5bpE3NqFGVsbibeGaOF1A8fs8LHNcEKSQ02AFtrRuN3TSzNQokmGGKkaSXnHkT8TrDA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"ad90dcf923047fefad53a76d7b3bf7ddbdddadf016b4ffdf2b501499932545d0","last_reissued_at":"2026-07-05T12:09:53.245464Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:09:53.245464Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2509.09987","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":"2026-07-05T12:09:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"N/IrGHfXmRVLaqSZ47PHT6+JV4uut7gdvl4/FxJlqBGKhOPYOGVuxQPPlmHhrssWiCwS16sGVtGXImBfPBJ+Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:41:06.598969Z"},"content_sha256":"f7dedd6ab107521e838fe0f8ac4c4a21be1d6ddf5601aeed4822fbb2eb175257","schema_version":"1.0","event_id":"sha256:f7dedd6ab107521e838fe0f8ac4c4a21be1d6ddf5601aeed4822fbb2eb175257"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2025:VWINZ6JDAR767LKTU5WXWO7X3W","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Whisper Has an Internal Word Aligner","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.CL"],"primary_cat":"eess.AS","authors_text":"Hao Tang, Sung-Lin Yeh, Yen Meng","submitted_at":"2025-09-12T06:03:24Z","abstract_excerpt":"There is an increasing interest in obtaining accurate word-level timestamps from strong automatic speech recognizers, in particular Whisper. Existing approaches either require additional training or are simply not competitive. The evaluation in prior work is also relatively loose, typically using a tolerance of more than 200 ms. In this work, we discover attention heads in Whisper that capture accurate word alignments and are distinctively different from those that do not. Moreover, we find that using characters produces finer and more accurate alignments than using wordpieces. Based on these "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.09987","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/2509.09987/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":"2026-07-05T12:09:53Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pqvkUXWg8bCSfZcBFeDtlzX5vAx9QBeJY26NpHoksDHcRIw9UfPVG1mOKq/BZ4PctLIK63pQcy9AZsy2ZhWRDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-05T10:41:06.599478Z"},"content_sha256":"5eb80f82bc8a5e6f2716d2ff1c275eda0842774b9f12ef67c0c78e15b391a287","schema_version":"1.0","event_id":"sha256:5eb80f82bc8a5e6f2716d2ff1c275eda0842774b9f12ef67c0c78e15b391a287"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/VWINZ6JDAR767LKTU5WXWO7X3W/bundle.json","state_url":"https://pith.science/pith/VWINZ6JDAR767LKTU5WXWO7X3W/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/VWINZ6JDAR767LKTU5WXWO7X3W/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":"2026-08-05T10:41:06Z","links":{"resolver":"https://pith.science/pith/VWINZ6JDAR767LKTU5WXWO7X3W","bundle":"https://pith.science/pith/VWINZ6JDAR767LKTU5WXWO7X3W/bundle.json","state":"https://pith.science/pith/VWINZ6JDAR767LKTU5WXWO7X3W/state.json","well_known_bundle":"https://pith.science/.well-known/pith/VWINZ6JDAR767LKTU5WXWO7X3W/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2025:VWINZ6JDAR767LKTU5WXWO7X3W","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":"0e4c7f08232a9c834105cf1bb90d10cd5a4ba8306d2b3d965298697a2a7690b4","cross_cats_sorted":["cs.CL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2025-09-12T06:03:24Z","title_canon_sha256":"c7a909cb57df89cebf74178b8914e6911ede1770ee4bc58a256e01512d74688a"},"schema_version":"1.0","source":{"id":"2509.09987","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2509.09987","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"arxiv_version","alias_value":"2509.09987v1","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2509.09987","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_12","alias_value":"VWINZ6JDAR76","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_16","alias_value":"VWINZ6JDAR767LKT","created_at":"2026-07-05T12:09:53Z"},{"alias_kind":"pith_short_8","alias_value":"VWINZ6JD","created_at":"2026-07-05T12:09:53Z"}],"graph_snapshots":[{"event_id":"sha256:5eb80f82bc8a5e6f2716d2ff1c275eda0842774b9f12ef67c0c78e15b391a287","target":"graph","created_at":"2026-07-05T12:09:53Z","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/2509.09987/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"There is an increasing interest in obtaining accurate word-level timestamps from strong automatic speech recognizers, in particular Whisper. Existing approaches either require additional training or are simply not competitive. The evaluation in prior work is also relatively loose, typically using a tolerance of more than 200 ms. In this work, we discover attention heads in Whisper that capture accurate word alignments and are distinctively different from those that do not. Moreover, we find that using characters produces finer and more accurate alignments than using wordpieces. Based on these ","authors_text":"Hao Tang, Sung-Lin Yeh, Yen Meng","cross_cats":["cs.CL"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2025-09-12T06:03:24Z","title":"Whisper Has an Internal Word Aligner"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2509.09987","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:f7dedd6ab107521e838fe0f8ac4c4a21be1d6ddf5601aeed4822fbb2eb175257","target":"record","created_at":"2026-07-05T12:09:53Z","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":"0e4c7f08232a9c834105cf1bb90d10cd5a4ba8306d2b3d965298697a2a7690b4","cross_cats_sorted":["cs.CL"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"eess.AS","submitted_at":"2025-09-12T06:03:24Z","title_canon_sha256":"c7a909cb57df89cebf74178b8914e6911ede1770ee4bc58a256e01512d74688a"},"schema_version":"1.0","source":{"id":"2509.09987","kind":"arxiv","version":1}},"canonical_sha256":"ad90dcf923047fefad53a76d7b3bf7ddbdddadf016b4ffdf2b501499932545d0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ad90dcf923047fefad53a76d7b3bf7ddbdddadf016b4ffdf2b501499932545d0","first_computed_at":"2026-07-05T12:09:53.245464Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T12:09:53.245464Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"El1m5y4Fd6ELrxAtZey5bpE3NqFGVsbibeGaOF1A8fs8LHNcEKSQ02AFtrRuN3TSzNQokmGGKkaSXnHkT8TrDA==","signature_status":"signed_v1","signed_at":"2026-07-05T12:09:53.245943Z","signed_message":"canonical_sha256_bytes"},"source_id":"2509.09987","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:f7dedd6ab107521e838fe0f8ac4c4a21be1d6ddf5601aeed4822fbb2eb175257","sha256:5eb80f82bc8a5e6f2716d2ff1c275eda0842774b9f12ef67c0c78e15b391a287"],"state_sha256":"59dc831048a46e6343daa1b4da18120c74f4404326c5daa8430b5628c0e3c05a"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zP0RLylRNYO/Aj6gaARNiX37F2Esme7Qj9MejkXbZW/sjRsnPuSIvUYMZqUYjXVSToq3BGEYvQN/h3xfQS5eAQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-05T10:41:06.602943Z","bundle_sha256":"9ff6d78fea5e52749a2fb790e062730e35cf2e9d6d40cdcfe3eabd7302d070e7"}}