Choi Jae-ho (; born March 17, 1980), known professionally as Choiza (), is a South Korean hip hop recording artist. He and Gaeko comprise the hip hop duo Dynamic Duo, which rose to fame upon the relea
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 0xfd3d6c75ca7e08db640217e53fdd049cd136f1da0311d6003754584a2552868b. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49305c61-ccfb-48bd-9262-44cbc9450ce9.json and https://artists.proofprofile.net/proofs/artist/49305c61-ccfb-48bd-9262-44cbc9450ce9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).