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 0x9d5ebdf50379c2f96f6138854b79eb9056f0fff92dc945c021727821172d2387. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4473c085-41cb-4111-bdb0-974bacc4ac66.json and https://artists.proofprofile.net/proofs/artist/4473c085-41cb-4111-bdb0-974bacc4ac66.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin: Nocturne No. 21 in C Minor, KK IVb/8
Chopin: Nocturnes, Op. 27: No. 1 Larghetto In C-Sharp Minor
Chopin: Nocturnes, Op. 37: No. 1 in G Minor (Andante sostenuto)
Chopin: Nocturnes, Op. 48: No. 2 in F-Sharp Minor (Andantino)
Chopin: Nocturnes, Op. 27: No. 2 Lento sostenuto In D-Flat Major
Chopin: 3 Waltzes, Op. 64: No. 1 in D-Flat Major "Minute". Molto vivace