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 0x5fce09d5270207eafd57ca94b0282548aaeff1378cc349e99272e1223d20b0b0. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/726c0b44-4433-4d82-b293-b11314b66036.json and https://artists.proofprofile.net/proofs/artist/726c0b44-4433-4d82-b293-b11314b66036.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin-Nocturne in C Sharp Minor Felt Piano
Chopin-Nocturne in C Sharp Minor Cinematic Piano
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 0xfc22868204f198db3dd7e4065dd54b16617664e46cc7ae320b87a2d78cc51138. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-16T01:39:48Z), 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/QZTB42426272.
Chopin Piano Concerto No. 1 in E minor, Op. 11 Piano
Chopin Piano concerto No. 2 in f minor, Op. 21
Chopin-Ballade No. 3 in A flat major, Op. 47