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 0xe05d42a6957a7eab9b750d96bd30c016d71052c8d1f9eaa6d49dc8332a241465. Chain 2 (Bitcoin): anchored in block 953759 (2026-06-15T08:04:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b1f807b7-df2c-491d-923b-0e037354b051.json and https://artists.proofprofile.net/proofs/artist/b1f807b7-df2c-491d-923b-0e037354b051.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Douce Plainte - Sweet Sorrow, Op. 100, No. 16