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 0xb1e09cfbedd43a504c3d16e36136a1f727e170f1d5cd59e26ebd62a9f278f2b7. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7275c0aa-4b96-4039-a659-6ca3fbee101c.json and https://artists.proofprofile.net/proofs/artist/7275c0aa-4b96-4039-a659-6ca3fbee101c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Baroque Concertos for Recorder: Vivaldi, Telemann, Graupner and Schulz
Concerto in C Major for Sopranino Recorder, Strings and B.C, RV 443: II. Largo
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 0xcce9ed26f046a1d17eef0d19b5d5a24dd10145693b4feb638cc0177c4fa1ee0a. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SEWDL0746902.
J.S. Bach: Flute Sonata in C Major, BWV 1033 (Digitally Remastered)
Finger: Sonata in C Major for Recorder and Harpsichord (Digitally Remastered)
Handel: Sonata No. 7 in C Major, Op. 1 HMV 365 (Digitally Remastered)
Handel: Six Fugues for Recorder (Digitally Remastered)
Loeillet: Sonata No. 1 in A Minor, Op. 1 (Digitally Remastered)
Hotteterre: Suite in D Major, Op. 5, No. 3 (Digitally Remastered)
Concerto No. 1 in C Major for Recorder and Strings, TWV 51:C1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbcea2ae7040b7838838e30f2a891894e8f9aee0419ad5d82e5241a82a46c971. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEWDL0769004.
Concerto No. 1 in C Major for Recorder and Strings, TWV 51:C1: III. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c46cdcc5d217972b3ebf2715c1a38388ba08130ff7f860786229245dc2bd3d. 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/SEWDL0741810.
The 50 Darkest Pieces of Classical Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce9ed26f046a1d17eef0d19b5d5a24dd10145693b4feb638cc0177c4fa1ee0a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/SEWDL0746902.
Concerto in C Major for Sopranino Recorder, Strings and B.C, RV 444: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89342c7a1a7cfe6747dccf7de77aeddef944a7ca45ba980ea548e95c4aab8121. 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/SEWDL0746908.
100 Pieces of Classical Music For Your Brain