Preloved.co.uk is a classified advertising website based in the UK. It was founded by Ian Buzer in 1998 and bought by The Hut Group in 2014. In January 2025, THG plc demerged its technology and logist
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 0xc316b657574339b4840209f9af61064e9af6485457a510429506425fcaf9a325. 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/78987a7d-8e88-4d8c-93a3-38519407dafc.json and https://artists.proofprofile.net/proofs/artist/78987a7d-8e88-4d8c-93a3-38519407dafc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).