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 0xb90506f9831f4cc98d4f4c77c815c4004d937e97c8d41cfd33f97b2d8952aafa. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/42777b9d-3c15-4f60-9e0c-e5ae11b844f2.json and https://artists.proofprofile.net/proofs/artist/42777b9d-3c15-4f60-9e0c-e5ae11b844f2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Bach - Goldberg Variations; Chopin - Preludes, Etudes