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 0x0d08f189568b5bd42922b5ea33d8c5d0f263987ea2544c30cc69dcd00175d5dc. Chain 2 (Bitcoin): anchored in block 954729 (2026-06-21T18:16:07Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbb3b25a-5b98-4c6c-8574-b9a1654b9712.json and https://artists.proofprofile.net/proofs/artist/fbb3b25a-5b98-4c6c-8574-b9a1654b9712.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Shostakovich: Symphony No.7 in C Major, Op60 "Leningrad"
Balakirev: Symphony No. 2, In Bohemia, Overture on Three Russian Songs