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 0x422f57379bc6fe008f076a3767ed2d118c054dcac2f8aa57223b6f3625771eed. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d283bf89-3447-41f4-93fa-d5bba22c13dd.json and https://artists.proofprofile.net/proofs/artist/d283bf89-3447-41f4-93fa-d5bba22c13dd.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Forqueray, A.: Suite No. 1 in D Minor / Baltzar, T.: Divisions On A Ground in G Major / Lawes, H.: Among Rosebuds