1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → block must exist at that height 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 artist was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0410939c60639f907237157c5af99fc70ef789e4ac8f9e532a4acf171fc151d3. Chain 2 (Bitcoin): anchored in block 953773 (2026-06-15T10:40:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ca3a8ea6-b97e-4ca4-baac-855f228a4d05.json and https://artists.proofprofile.net/proofs/artist/ca3a8ea6-b97e-4ca4-baac-855f228a4d05.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Parsons, R.: First Great Service / Responds for the Dead
Responds for the Dead: Peccantem me, quotidie
Responds for the Dead: Libera me, Domine
Responds for the Dead: Credo quod redemptor
Loquebantur: Music from the Dow Partbooks
Byrd - Dowland : Ye Sacred Muses, Complaintes, élégies et chansons
QuintEssential Sackbut and Cornett Ensemble
The Great Glad Tidings Tell, Carols from Copley Square
Choir of Gonville & Caius College, Cambridge