JCube was a shopping centre located in Jurong East, Singapore, that operated from 2 April 2012 to 6 August 2023. It used to house an Olympic-size ice rink and Singapore's first IMAX theatre in the sub
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a230d3d65bb2defa3a5921ba8beba2728822cc1b37b4f4ea0c0a11bb140e0c. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/95938f90-5fe0-4b63-b4f3-959e6d0ea7e3.json and https://artists.proofprofile.net/proofs/artist/95938f90-5fe0-4b63-b4f3-959e6d0ea7e3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).