{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2021:2ZAV5XEKWYGBJA3B46YEDKKS6T","short_pith_number":"pith:2ZAV5XEK","canonical_record":{"source":{"id":"2105.02373","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2021-05-05T23:53:27Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"5e17bf6ef563b18334e27d30459f6f7d7ab37d7930c1ea7882d187fc599b3a7a","abstract_canon_sha256":"81492102f5bd6364f1d2bd29a383389afa1ddd455deb9d07db4341c8d620b379"},"schema_version":"1.0"},"canonical_sha256":"d6415edc8ab60c148361e7b041a952f4e130800e97e430baf3d0a5a45a0ad23d","source":{"kind":"arxiv","id":"2105.02373","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.02373","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"arxiv_version","alias_value":"2105.02373v4","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.02373","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_12","alias_value":"2ZAV5XEKWYGB","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_16","alias_value":"2ZAV5XEKWYGBJA3B","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_8","alias_value":"2ZAV5XEK","created_at":"2026-07-05T02:53:57Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2021:2ZAV5XEKWYGBJA3B46YEDKKS6T","target":"record","payload":{"canonical_record":{"source":{"id":"2105.02373","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2021-05-05T23:53:27Z","cross_cats_sorted":["eess.AS"],"title_canon_sha256":"5e17bf6ef563b18334e27d30459f6f7d7ab37d7930c1ea7882d187fc599b3a7a","abstract_canon_sha256":"81492102f5bd6364f1d2bd29a383389afa1ddd455deb9d07db4341c8d620b379"},"schema_version":"1.0"},"canonical_sha256":"d6415edc8ab60c148361e7b041a952f4e130800e97e430baf3d0a5a45a0ad23d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T02:53:57.356515Z","signature_b64":"JtbWkwgdsHvzWlS7e60jWaUQvK28Yg14xB/m3MNInIgCtP222/PnSUf6YFmX1rxJ/mjVkNZTfevhqQ11ruMiBw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d6415edc8ab60c148361e7b041a952f4e130800e97e430baf3d0a5a45a0ad23d","last_reissued_at":"2026-07-05T02:53:57.356100Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T02:53:57.356100Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2105.02373","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-05T02:53:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"d2MjAFZ4YrKNUdJlVQzxeACezFqms6D2UNbWa2xtS4Vso32VSEGVYh9IF9Jr8LP4qM3dxuttEyoeMklIV2vCAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T09:21:52.151760Z"},"content_sha256":"a5c825db75a02913e906ed87bd26a0b52665ad06154b6b8336c0fa5755104770","schema_version":"1.0","event_id":"sha256:a5c825db75a02913e906ed87bd26a0b52665ad06154b6b8336c0fa5755104770"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2021:2ZAV5XEKWYGBJA3B46YEDKKS6T","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"How do Voices from Past Speech Synthesis Challenges Compare Today?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["eess.AS"],"primary_cat":"cs.SD","authors_text":"Erica Cooper, Junichi Yamagishi","submitted_at":"2021-05-05T23:53:27Z","abstract_excerpt":"Shared challenges provide a venue for comparing systems trained on common data using a standardized evaluation, and they also provide an invaluable resource for researchers when the data and evaluation results are publicly released. The Blizzard Challenge and Voice Conversion Challenge are two such challenges for text-to-speech synthesis and for speaker conversion, respectively, and their publicly-available system samples and listening test results comprise a historical record of state-of-the-art synthesis methods over the years. In this paper, we revisit these past challenges and conduct a la"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.02373","kind":"arxiv","version":4},"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/2105.02373/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":"2026-07-05T02:53:57Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"GxaIsZeQEuOhUjcAwz56ATcCqJZ+yD/5y8ei/Pscr8W1yUAcqmSg761sWH8B9UmxhyYSO4LvHNqYDZ0P1HFqAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-22T09:21:52.152265Z"},"content_sha256":"6038d780bcec1e850d1e04d256c4ed630d37589602a4d31e4c2844fcde562fa0","schema_version":"1.0","event_id":"sha256:6038d780bcec1e850d1e04d256c4ed630d37589602a4d31e4c2844fcde562fa0"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/bundle.json","state_url":"https://pith.science/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/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":"2026-08-22T09:21:52Z","links":{"resolver":"https://pith.science/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T","bundle":"https://pith.science/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/bundle.json","state":"https://pith.science/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2ZAV5XEKWYGBJA3B46YEDKKS6T/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:2ZAV5XEKWYGBJA3B46YEDKKS6T","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":"81492102f5bd6364f1d2bd29a383389afa1ddd455deb9d07db4341c8d620b379","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2021-05-05T23:53:27Z","title_canon_sha256":"5e17bf6ef563b18334e27d30459f6f7d7ab37d7930c1ea7882d187fc599b3a7a"},"schema_version":"1.0","source":{"id":"2105.02373","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2105.02373","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"arxiv_version","alias_value":"2105.02373v4","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2105.02373","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_12","alias_value":"2ZAV5XEKWYGB","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_16","alias_value":"2ZAV5XEKWYGBJA3B","created_at":"2026-07-05T02:53:57Z"},{"alias_kind":"pith_short_8","alias_value":"2ZAV5XEK","created_at":"2026-07-05T02:53:57Z"}],"graph_snapshots":[{"event_id":"sha256:6038d780bcec1e850d1e04d256c4ed630d37589602a4d31e4c2844fcde562fa0","target":"graph","created_at":"2026-07-05T02:53:57Z","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/2105.02373/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Shared challenges provide a venue for comparing systems trained on common data using a standardized evaluation, and they also provide an invaluable resource for researchers when the data and evaluation results are publicly released. The Blizzard Challenge and Voice Conversion Challenge are two such challenges for text-to-speech synthesis and for speaker conversion, respectively, and their publicly-available system samples and listening test results comprise a historical record of state-of-the-art synthesis methods over the years. In this paper, we revisit these past challenges and conduct a la","authors_text":"Erica Cooper, Junichi Yamagishi","cross_cats":["eess.AS"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2021-05-05T23:53:27Z","title":"How do Voices from Past Speech Synthesis Challenges Compare Today?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2105.02373","kind":"arxiv","version":4},"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:a5c825db75a02913e906ed87bd26a0b52665ad06154b6b8336c0fa5755104770","target":"record","created_at":"2026-07-05T02:53:57Z","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":"81492102f5bd6364f1d2bd29a383389afa1ddd455deb9d07db4341c8d620b379","cross_cats_sorted":["eess.AS"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"cs.SD","submitted_at":"2021-05-05T23:53:27Z","title_canon_sha256":"5e17bf6ef563b18334e27d30459f6f7d7ab37d7930c1ea7882d187fc599b3a7a"},"schema_version":"1.0","source":{"id":"2105.02373","kind":"arxiv","version":4}},"canonical_sha256":"d6415edc8ab60c148361e7b041a952f4e130800e97e430baf3d0a5a45a0ad23d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d6415edc8ab60c148361e7b041a952f4e130800e97e430baf3d0a5a45a0ad23d","first_computed_at":"2026-07-05T02:53:57.356100Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T02:53:57.356100Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"JtbWkwgdsHvzWlS7e60jWaUQvK28Yg14xB/m3MNInIgCtP222/PnSUf6YFmX1rxJ/mjVkNZTfevhqQ11ruMiBw==","signature_status":"signed_v1","signed_at":"2026-07-05T02:53:57.356515Z","signed_message":"canonical_sha256_bytes"},"source_id":"2105.02373","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a5c825db75a02913e906ed87bd26a0b52665ad06154b6b8336c0fa5755104770","sha256:6038d780bcec1e850d1e04d256c4ed630d37589602a4d31e4c2844fcde562fa0"],"state_sha256":"93f1bd8ee4e47892567381894d80f9089b5a65c58e34676946e71dbe31a26990"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"byyPtq+r9xGvwC5hS7RYoyR+1VkCn7U14uZK9qIpYYVIkewmwcAscpu0vSDMyRu2mJUpJebe86o45TT7jLCTCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-22T09:21:52.157466Z","bundle_sha256":"f125af58c77df988410aac12882a29aec919156d9ec9800c6ff4ddb3d14ef3a9"}}