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 0x7e615900e7ced74e749a64d99fdc204eb3b5e8c52d8eef68f9d60a490a006d4f. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6a0d50cf-8df5-4399-9a82-331ad8564fc1.json and https://artists.proofprofile.net/proofs/artist/6a0d50cf-8df5-4399-9a82-331ad8564fc1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Choral Recital: Tower Voices New Zealand - Griffiths, D. / Whitehead, G. / Hamilton, D. / Ritchie, A. (Spirit of the Land)