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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ea2373d5c04904fb9347e70d0c06a1afe816a487d88b5c391aa6d183cd5f121. Chain 2 (Bitcoin): anchored in block 954028 (2026-06-17T01:08:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/39c89d74-754f-4225-8eb9-66564d7ee90a.json and https://artists.proofprofile.net/proofs/artist/39c89d74-754f-4225-8eb9-66564d7ee90a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chan / Daniel / Lesage / Macdonald / Murphy: Contemporary Works for Violin and Piano
Mendelssohn / MacDonald Double Concertos
Maier | Franck | Schumann: Sonatas for Violin & Piano
Violin Sonata No. 1 in A Minor, Op. 105: I. Mit leidenschaftlichem Ausdruck
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4740f98e64b257858e9bd76a07b45078331ef0931d2d408048cac2548757a103. Chain 2 (Bitcoin): anchored in block 957788 (2026-07-13T02:37:37Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBEBL2531601.
Strophic Songs. Op. 21, Book I: III. Jens Vejmand
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1619329f4a5683e9dc2c6724c6532f8ea275fe0fc9989926c69b47e08507bcb9. 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/DKABA1000297.