TVXQ (stylized as TVXQ!; ), also known as in Japan, is a South Korean duo formed by SM Entertainment, composed of U-Know Yunho and Max Changmin. Originally formed in 2003 as a five-member boy band w
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 0xd764e406fdf0c20ddbe03a6b0793f746ecc9ae8ede3aaab6a7d37e3f257bc73d. Chain 2 (Bitcoin): anchored in block 954556 (2026-06-20T12:14:15Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/adaa2b5a-aafa-40c3-b37e-b72d0b478d18.json and https://artists.proofprofile.net/proofs/artist/adaa2b5a-aafa-40c3-b37e-b72d0b478d18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).