thumb|The six-part fugue in the "Ricercar a 6" from The Musical Offering, in the hand of Johann Sebastian Bach In classical music, a fugue (, from Latin , meaning 'flight' or 'escape'"Fugue, n." The C
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 0x507ae3aa8655f0de835605837d9033b561cc9366f9120d2418aa2358190ac13e. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3424f52-c7d9-44dc-b19f-9fc8b8edf764.json and https://artists.proofprofile.net/proofs/artist/e3424f52-c7d9-44dc-b19f-9fc8b8edf764.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).