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 0xa08bd30dfd9c439c73200ca6b5396a7b8c5e47a7425ddb85cdc93dc728d54ecc. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0171f88a-fbb9-4287-9723-c6c5153ea4d0.json and https://artists.proofprofile.net/proofs/artist/0171f88a-fbb9-4287-9723-c6c5153ea4d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Orpheus: Songs, Arias & Madrigals from the 17th Century
Cesti: Natura et quatuor elementa dolentia ad Sepulchrum Christi (Arr. for Chamber Ensemble by Andreas Küppers)
Albert, Brouck & Byrd: Durch die Nacht zu den Sternen