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 0xd330302b6639c19425ed1c1b7fc3588ae6a58bac256e701cc77e22173408deec. Chain 2 (Bitcoin): anchored in block 953827 (2026-06-15T19:59:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e655b909-7a65-490d-9dd4-000bab9608e2.json and https://artists.proofprofile.net/proofs/artist/e655b909-7a65-490d-9dd4-000bab9608e2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).