thumb|right|Chlorite schist, a type of greenschist thumb|Greenschist (prasinite) at Cap Corse in Corsica, France thumb|Greenschist (epidote) from Itogon, Benguet, Philippines Greenschists are metamor
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 0x7d5918b86c2ac04724bc1e008c1646a6aa13a25fc465e6f09b0e2932d0dae5e2. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90bef848-9c47-4cdb-a272-6f678d463ee3.json and https://artists.proofprofile.net/proofs/artist/90bef848-9c47-4cdb-a272-6f678d463ee3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).