Roos is a village and civil parish in the East Riding of Yorkshire, England. It is situated east from Kingston upon Hull city centre and north-west from Withernsea, and on the B1242 road. History
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 0x11927336ae9fe9e15e2a9d72974d9f33a24f3c942ad55c5b311d2c65837a2026. Chain 2 (Bitcoin): anchored in block 954055 (2026-06-17T05:51:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43222950-ad6f-48ac-97d8-1d8e9f8eafe2.json and https://artists.proofprofile.net/proofs/artist/43222950-ad6f-48ac-97d8-1d8e9f8eafe2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).