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 0x73de853fa966a46fa5f75a1ba7f0f958adfbcd53ba0c8613b790b4fce7967573. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e68d88bd-f8c9-49fe-8c0e-6c1b26158b16.json and https://artists.proofprofile.net/proofs/artist/e68d88bd-f8c9-49fe-8c0e-6c1b26158b16.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Amstel Moments Atzko Kohashi meets Frans van der Hoeven