{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:3WO6T4K5VUN3SKD4PVHEVSGITL","short_pith_number":"pith:3WO6T4K5","canonical_record":{"source":{"id":"2606.20890","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-06-18T19:38:57Z","cross_cats_sorted":["cs.IR"],"title_canon_sha256":"23f32faa918cb3bb12d20c71869f94158d3ae60f7a88bfe059bd6d9deb971d80","abstract_canon_sha256":"8da80ba3608721369d2089d9b24ce2b6668e19436933a9284026560d2e8d49b4"},"schema_version":"1.0"},"canonical_sha256":"dd9de9f15dad1bb9287c7d4e4ac8c89ae3ad92dc40fbcf8170c936ebc057ae8e","source":{"kind":"arxiv","id":"2606.20890","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.20890","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"arxiv_version","alias_value":"2606.20890v1","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.20890","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_12","alias_value":"3WO6T4K5VUN3","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_16","alias_value":"3WO6T4K5VUN3SKD4","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_8","alias_value":"3WO6T4K5","created_at":"2026-06-23T00:12:01Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:3WO6T4K5VUN3SKD4PVHEVSGITL","target":"record","payload":{"canonical_record":{"source":{"id":"2606.20890","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-06-18T19:38:57Z","cross_cats_sorted":["cs.IR"],"title_canon_sha256":"23f32faa918cb3bb12d20c71869f94158d3ae60f7a88bfe059bd6d9deb971d80","abstract_canon_sha256":"8da80ba3608721369d2089d9b24ce2b6668e19436933a9284026560d2e8d49b4"},"schema_version":"1.0"},"canonical_sha256":"dd9de9f15dad1bb9287c7d4e4ac8c89ae3ad92dc40fbcf8170c936ebc057ae8e","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-23T00:12:01.901257Z","signature_b64":"e0Rg5qzkHOu7kArjoFSqS8rp10VULJFUxnCV4wnoekVSRmBOR+1i2s5hKw/z9oiy/E5hZDA7LIu/lvsBxBFtCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dd9de9f15dad1bb9287c7d4e4ac8c89ae3ad92dc40fbcf8170c936ebc057ae8e","last_reissued_at":"2026-06-23T00:12:01.900815Z","signature_status":"signed_v1","first_computed_at":"2026-06-23T00:12:01.900815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.20890","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":"2026-06-23T00:12:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QlD/oU059VyXda2ewrUrtcveTPutWI6f487MfptZpasyvzBrmUFAGD2tzEUyJyduC7nzK4V13YeQGN3TXE7kDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T14:38:35.890405Z"},"content_sha256":"078f6728ed1246571c830f21c77ec64c2a32616dd047039f4facfc545f8ca061","schema_version":"1.0","event_id":"sha256:078f6728ed1246571c830f21c77ec64c2a32616dd047039f4facfc545f8ca061"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:3WO6T4K5VUN3SKD4PVHEVSGITL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Topic-to-Timestamp Alignment by Constrained Evidence Selection","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["cs.IR"],"primary_cat":"cs.CL","authors_text":"Marina Litvak, Michael F\\\"arber, Zeynep Y{\\i}lb{\\i}rt","submitted_at":"2026-06-18T19:38:57Z","abstract_excerpt":"Meeting archives are difficult to search when users remember what was discussed but not when. We study topic-to-timestamp alignment: given a natural-language topic and a timestamped meeting transcript, the goal is to return the time at which the topic is discussed. A standard RAG setup can retrieve relevant transcript excerpts, but still asks the language model to generate a timestamp, which can produce unsupported or invalid timecodes. We therefore recast timestamp prediction as constrained temporal candidate selection: the system retrieves timestamped transcript chunks, and the model selects"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.20890","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/2606.20890/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":"2026-06-23T00:12:01Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/M4RthqmPlQX6lavFkVZdfch6NsR4+l4MlX4qZ34QJ9CX+Ema4axp7AYMJaLSAudyRp97vPIZoEjWIizsP0nAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-29T14:38:35.890777Z"},"content_sha256":"1f129c599ac00d198b7949ce68ef7166c265e8c73aae00f681ad6fce9714ca7e","schema_version":"1.0","event_id":"sha256:1f129c599ac00d198b7949ce68ef7166c265e8c73aae00f681ad6fce9714ca7e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/bundle.json","state_url":"https://pith.science/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/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":"2026-06-29T14:38:35Z","links":{"resolver":"https://pith.science/pith/3WO6T4K5VUN3SKD4PVHEVSGITL","bundle":"https://pith.science/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/bundle.json","state":"https://pith.science/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3WO6T4K5VUN3SKD4PVHEVSGITL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:3WO6T4K5VUN3SKD4PVHEVSGITL","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":"8da80ba3608721369d2089d9b24ce2b6668e19436933a9284026560d2e8d49b4","cross_cats_sorted":["cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-06-18T19:38:57Z","title_canon_sha256":"23f32faa918cb3bb12d20c71869f94158d3ae60f7a88bfe059bd6d9deb971d80"},"schema_version":"1.0","source":{"id":"2606.20890","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.20890","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"arxiv_version","alias_value":"2606.20890v1","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.20890","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_12","alias_value":"3WO6T4K5VUN3","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_16","alias_value":"3WO6T4K5VUN3SKD4","created_at":"2026-06-23T00:12:01Z"},{"alias_kind":"pith_short_8","alias_value":"3WO6T4K5","created_at":"2026-06-23T00:12:01Z"}],"graph_snapshots":[{"event_id":"sha256:1f129c599ac00d198b7949ce68ef7166c265e8c73aae00f681ad6fce9714ca7e","target":"graph","created_at":"2026-06-23T00:12:01Z","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/2606.20890/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Meeting archives are difficult to search when users remember what was discussed but not when. We study topic-to-timestamp alignment: given a natural-language topic and a timestamped meeting transcript, the goal is to return the time at which the topic is discussed. A standard RAG setup can retrieve relevant transcript excerpts, but still asks the language model to generate a timestamp, which can produce unsupported or invalid timecodes. We therefore recast timestamp prediction as constrained temporal candidate selection: the system retrieves timestamped transcript chunks, and the model selects","authors_text":"Marina Litvak, Michael F\\\"arber, Zeynep Y{\\i}lb{\\i}rt","cross_cats":["cs.IR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-06-18T19:38:57Z","title":"Topic-to-Timestamp Alignment by Constrained Evidence Selection"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.20890","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":"sha256:078f6728ed1246571c830f21c77ec64c2a32616dd047039f4facfc545f8ca061","target":"record","created_at":"2026-06-23T00:12:01Z","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":"8da80ba3608721369d2089d9b24ce2b6668e19436933a9284026560d2e8d49b4","cross_cats_sorted":["cs.IR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.CL","submitted_at":"2026-06-18T19:38:57Z","title_canon_sha256":"23f32faa918cb3bb12d20c71869f94158d3ae60f7a88bfe059bd6d9deb971d80"},"schema_version":"1.0","source":{"id":"2606.20890","kind":"arxiv","version":1}},"canonical_sha256":"dd9de9f15dad1bb9287c7d4e4ac8c89ae3ad92dc40fbcf8170c936ebc057ae8e","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dd9de9f15dad1bb9287c7d4e4ac8c89ae3ad92dc40fbcf8170c936ebc057ae8e","first_computed_at":"2026-06-23T00:12:01.900815Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-23T00:12:01.900815Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"e0Rg5qzkHOu7kArjoFSqS8rp10VULJFUxnCV4wnoekVSRmBOR+1i2s5hKw/z9oiy/E5hZDA7LIu/lvsBxBFtCQ==","signature_status":"signed_v1","signed_at":"2026-06-23T00:12:01.901257Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.20890","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:078f6728ed1246571c830f21c77ec64c2a32616dd047039f4facfc545f8ca061","sha256:1f129c599ac00d198b7949ce68ef7166c265e8c73aae00f681ad6fce9714ca7e"],"state_sha256":"43e264a249c52cadeb61651a6c09dcbdc5b7f729e251cbfb5adea14bcb596349"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RhRSwPNmkCZY93FSdMywX593J/uQ/9F9/uVAvw7uQiI34wHPL4ADcI1d0TwYpkAW0nN7zZJNRlnay/Nn+Vr9Ag==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-29T14:38:35.892771Z","bundle_sha256":"0bc077c153adbe9ead5d0993a1a17a0583d1700ea324ec7b5e063bdb246e716e"}}