Blue diamonds are a type of diamond which exhibit all of the same inherent properties of the mineral except with the additional element of blue color in the stone. The Mohs hardness of a blue diamond
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 0x8d749a405697f6bf07b5f56f7d6f92a177129725200eb3b62c2ff9b1a313c525. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d0e87d4a-45b7-4f0e-8596-03ae975960ff.json and https://artists.proofprofile.net/proofs/artist/d0e87d4a-45b7-4f0e-8596-03ae975960ff.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.