Apeace (; Japanese: ), formerly known as Double B 21 () or Double B, was a South Korean boy band formed and under Golden Goose Entertainment. The group was the largest K-pop boy band, with 21 members,
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 0xfa3ddbd127e69c9260c50f2036a687eccc247612f10a071bf6049b4300a45668. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/feddad3c-e669-4b90-a1a4-6f879dba2970.json and https://artists.proofprofile.net/proofs/artist/feddad3c-e669-4b90-a1a4-6f879dba2970.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).