One Pact (; ; stylized in all caps) is a South Korean boy band formed and managed by Armada Ent. The group consists of 5 members: Jongwoo, Jay Chang, Seongmin, Tag, and Yedam. They debuted on November
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 0x125f3a7cacd164956bcf5667e26a77a32c4c91cc2ca1d7019a04a70a9a0bba63. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d5b10f26-6571-493b-92c6-241327325c6a.json and https://artists.proofprofile.net/proofs/artist/d5b10f26-6571-493b-92c6-241327325c6a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).