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 0xbcb5da76f37d75b161e7a95fc923f19931579a60ca0e042315a5b608c1665794. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/971b3bc7-032b-4b49-ade5-b140a74ca0e2.json and https://artists.proofprofile.net/proofs/artist/971b3bc7-032b-4b49-ade5-b140a74ca0e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Chopin: National Edition [B] Vol. 4 - Waltzes [B] & Other Works
Chopin: National Edition - Piano Concertos