thumb|right|Blueberries showing various stages of maturation. IG = Immature Green, GP = Green Pink, BP = Blue Pink, and R = Ripe. Blueberries are a widely distributed and widespread group of perennia
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c678dbfb4d96effbce60e6ed568a44432f81b6427cbe7f88a1fe71027cd182a. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80717d69-1d50-4c71-b8f6-23fb85b99e9f.json and https://artists.proofprofile.net/proofs/artist/80717d69-1d50-4c71-b8f6-23fb85b99e9f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).