UU or uu may refer to: Businesses United Utilities (LSE stock symbol UU) Air Austral (IATA airline code UU) Language "uu", an old way of spelling the letter "w" in certain Germanic languages, inc
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 0x6c27e6b210841643b9b54eba22f8afb0e38a185b3f5141a5d966999e83b94312. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a0d3c51c-c091-46a1-9b17-40ef3e7d8bae.json and https://artists.proofprofile.net/proofs/artist/a0d3c51c-c091-46a1-9b17-40ef3e7d8bae.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).