Una and UNA may refer to: People Una (given name), including a list of people and fictional characters with the name Arts and entertainment Una (film), a 2016 drama Una, a 1981 novel by Momo Kapo
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 0x3468f4a8321f6718a20aff2911554a04ed209d1455c658800eebf709f7db3031. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d6d28b8d-94f9-4cb7-9d24-7ecfc68d6748.json and https://artists.proofprofile.net/proofs/artist/d6d28b8d-94f9-4cb7-9d24-7ecfc68d6748.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).