Kim Hee-soo (; born May 10, 1994), better known as Colde (), is a South Korean singer-songwriter. He debuted in 2016 as a member of the indie duo Off On Off. As a solo artist he has released the exten
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 0x550bb92f1968d612cf7b1050f62e80e7f2d1d8aae35f81ef5a723a85b1312e93. 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/a31fb5fe-7a68-4584-b740-069f192c06ee.json and https://artists.proofprofile.net/proofs/artist/a31fb5fe-7a68-4584-b740-069f192c06ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).