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 0xe803f1b5492da7b28c355f49c113c7afc6a043d13b4891252874d7fa522d200c. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5b7acfab-4815-4766-a762-158fca600da2.json and https://artists.proofprofile.net/proofs/artist/5b7acfab-4815-4766-a762-158fca600da2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clemens Hagen + 1b1: Haydn Cello Concerto in C, Mozart Sinfonia Concertante
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; I Allegro
Bach & Telemann Concertos for Viola & Bassoon
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 0x2ca000d54974703fe05e23ec0a69b653dd730dfa09ca68ffe7a8142a75c973cd. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326010.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; I Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d79fe1ea0d4b798036db04fe17f05d4d33ce1886d2298cbe88738042ca658b. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326070.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; III Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7716337fa23826ce7cf148b8aabc55e8a381594a83416614783c024249c065f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326090.
Concerto in G Major for Viola, Strings and Basso Continuo; II Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5123e448b636404a4916c0a362aecf3d9aa106cc06b40418f7f67208185219e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326110.
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; II Siciliano
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3d4a6640a7d767fa1215313852d06ed56c5aca43a69acaef280baa79c53ebe1. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326020.
Concerto in E-flat Major for Viola, Strings and Basso Continuo, reconstruction based on BWV 169, 49, 1053; III Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b71d665711a319d4071247101a8788ab868d9bd38b5b8f1740b0ef9ae08e6f0. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326030.
Concerto in C Minor for Bassoon, Viola, Strings and Basso Continuo, Reconstruction based on the version for Violin, Oboe, Strings and Basso Continuo, BWV 1060; II Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf524524e26d5a190834cc913321c32a010e19d0be045899b4cbcadfe05b1440. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326080.
Concerto in G Major for Viola, Strings and Basso Continuo; I Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e816fca96f0762283e4c4985647a715ee7d83748d60b830f7ba4f73eaef67b2. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326100.
Concerto in G Major for Viola, Strings and Basso Continuo; III Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b94e68334eb83eacbf4d9ab08672535c277dc692d32342ed6db1e112cb117ce. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326120.
Concerto in G Major for Viola, Strings and Basso Continuo; IV Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5c5c800d9c353ab65ae1b83a60c1e08b139bf2d4153674739b0e8d4075a1fa. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326130.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; I Avec douceur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98248518b9ffe8b27d04724975a8d3804cb0c2c3d5cafc20a485e8f8a0fe4bda. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326140.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; II Gay
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5578e86b3221b8c473db7c4d0842e134a253747b23201d3c4780b4d0816ac7a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326150.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; III Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfe8a1f82f797b3ce05a3bf01f4ea7e93630241f21111a19e5f48505fdc791e3. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326160.
Concerto in G Major for Viola, Bassoon, Strings and Basso Continuo; IV Vivement
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba43086d57584982cfb036b8fbfb645e4bb112840b3d73cf99a06fdcdcde6cd. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS1326170.