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 0x10f8e44008b1d4c3ece3e3f407d07e752a59aff6c9aac9f33e72721571cf7a57. Chain 2 (Bitcoin): anchored in block 953812 (2026-06-15T17:06:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f696d4d0-85dc-40b0-ae82-effcb2008d3b.json and https://artists.proofprofile.net/proofs/artist/f696d4d0-85dc-40b0-ae82-effcb2008d3b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Smetana: Piano Trio in G Minor - Dvořák: Piano Trio "Dumky"
Smetana: Piano Trio in G minor, Dvorak: Piano Trio "Dumky"
Piano Trio in A Minor, M. 67: III. Passacaille. Très large
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 0x20e8b4b74eb5ef1e6a11f18c102238458f340e0843d84219ead966557286b642. Chain 2 (Bitcoin): anchored in block 958319 (2026-07-17T01:03:05Z), 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/CZA161304302.
Reicha, Mendelssohn, Smetana: Works for Piano Trio
Zemlinsky, Rachmaninov, Arensky: Piano Trios