1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16672e9a95cc59a0f6c30aa0eecfc5c8f264242b8f85efa23b8a27547d1216a. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a4142af2-61ec-4d3e-8c1e-8cbfec035aa0.json and https://artists.proofprofile.net/proofs/artist/a4142af2-61ec-4d3e-8c1e-8cbfec035aa0.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
2004 Texas Music Educators Association (TMEA): All-State Mixed Chorus, All-State Men's Chorus & All-State Women's Chorus
2001 Texas Music Educators Association (TMEA): All-State Mixed Chorus & All-State Women's Chorus
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf9b5409b28cdaae53e6a477f2cbb02c971e75bde44858b855d1ddf399036fa8. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1316306 — a six-check JSON result.
2016 Texas Music Educators Association (TMEA): All-State Women's Choir [Live]
Under the Willow (Arr. S. LaBarr for Choir) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x598a1bb6f3b64d51cc241c722552afb17dbf433d23e0160e89fac8c05b52ee7c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1608307 — a six-check JSON result.
2015 Texas Music Educators Association (TMEA): All-State Women's Choir & All-State Men's Choir [Live]
In Praise of Music: I Pant for the Music, Which Is Divine (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb506bb9fadf1ae3a86a98c266c0f96c60df87f1e0abb80f7739fd44019634cdd. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502602 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63c2ce57a28c11ca2592936942785e6d477e964f118180d30537b522abfa915. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502605 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x905182a1a3a4edb97eecb916b71ade8387b4173e9b83a2c45fea9a4b418a4f93. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502606 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x973b6ee1f1d61f6d318f4067ecd295e3773f885e0db1b6ce7f8c053cd2ac0087. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502611 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44f9cfa932c75895de96e87b64e8a400bb563732992b5dcff659b0c67aeaa71f. Chain 2 (Bitcoin): anchored in block 960268 (2026-07-30T14:53:07Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502613 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3e5bbf3627296a2f99002efb61c99f331396accf292989f48558cabefbb6a0. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1502616 — a six-check JSON result.
2014 Texas Music Educators Association (TMEA): All-State Women's Choir & All-State Men's Choir [Live]
2009 Texas Music Educators Association (TMEA): All-State Men's Choir & All-State Women's Choir
2008 Texas Music Educators Association (TMEA): All-State Women's Choir & All-State Men's Choir
2013 Texas Music Educators Association (TMEA): All-State Women's Choir & All-State Men's Choir
Texas Music Educators Association 2011 Clinic and Convention - All State Men's and Women's Choir
Texas Music Educators Association 2010 Clinic and Convention - All-State Men's Choir / All-State Women's Choir
2003 Texas Music Educators Association (TMEA): All-State Mixed Chorus, All-State Men's Chorus & All-State Women's Chorus [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0be528ec14940e278829c185a513352b04b86b1c22b2ae443fc2d3371bc5e294. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1315702 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5784ec046a7fc09d1e712dde8cb555f1f5c62d0a01bb817b58b20807f1817884. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1315708 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x753bce5cb7fdcfb58702a1ed5e8655a0bb2a65b58c753280ba3723298f273159. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1315722 — a six-check JSON result.
Songs for Women's Voices: I Will Be Earth (Live)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e300b7bbd8d13ae8f3f831eda4a81eacb8ac40301732eb55cac3325e45153e. Chain 2 (Bitcoin): anchored in block 960173 (2026-07-30T00:11:40Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1315725 — a six-check JSON result.
2005 Texas Music Educators Association (TMEA): All-State Mixed Chorus, All-State Men's Chorus & All-State Women's Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0d202e7bb68b62d22120e98e71690dc263fc4e6ad91a0548238b54ad81ed9b0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1315016 — a six-check JSON result.
2012 Texas Music Educators Association (TMEA): All-State Women's Choir & All-State Men's Choir
How Can I Keep from Singing? (Arr. G.V.A. Walker)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11fdf92a5d68903c69fe80d705e9702dfaed214ddaecda9a11cd3b3f52e8ad6a. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1207102 — a six-check JSON result.
The Seal Lullaby (Version for female choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235feb5c16d5697de487372792083bc48b3c80f59e0b1a08859ed5bfea7762ab. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1207103 — a six-check JSON result.
Ain't No Grave Can Hold My Body Down (Arr. P. Caldwell and S. Ivory)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23d46bb4feba8a9c7e684f148ca37dcc63f93f6c2bba08946513c086ad998b57. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1207108 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de31d801f56fc24b1d07bf5f75affe4c6106c15189b2cc4499c3cc739e81c5e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1207111 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0244bde91eac5dce1efd29569f8f51d472ffcd2d80d8a0b7d22bd7cd55a3e30f. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1207114 — a six-check JSON result.
2007 Texas Music Educators Association (TMEA): All-State Mixed Choir, All-State Women's Choir & All-State Men's Choir [Live]
University of North Texas Symphony Orchestra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb7e5b2deefe6cf2fbb38a394e87922ef9eeb3da7fccde52c2843c0074f43851. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1313916 — a six-check JSON result.
Las Amarillas (Arr. S. Hatfield for Choir) [Live]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb021ec21fdccf01a39b0458f817cb0326bfcb17f1078f796d97bdc17b6387888. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1313918 — a six-check JSON result.
Veniki (Brooms) (arr. F. Rubtsov for choir)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2888fe024e5bdf390dec2ed92558ac8b4ce37914e3a5b680e62604955d4fb39f. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1222612 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8489eb8ac315ca7b360461b39d97d19082764ad43653219550d8290ce43053fe. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USVZX1313506 — a six-check JSON result.