199X is the debut extended play by South Korean co-ed group, Triple H, composed of solo singer Hyuna, Pentagon member Hui, and former Pentagon member Dawn (formally known as E'Dawn). It was released b
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 0x00da4328447611ffd957c2b9c2e3503b85acd3fb0da859c00a347b382da1414e. Chain 2 (Bitcoin): anchored in block 953662 (2026-06-14T17:28:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/562f7adb-7372-4244-ae19-d395724485b5.json and https://artists.proofprofile.net/proofs/artist/562f7adb-7372-4244-ae19-d395724485b5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).