Newtro is the fifth extended play by South Korean girl group DIA. It was released digitally on March 19, 2019 and physically on March 29, 2019 by MBK Entertainment under Kakao M's music distribution.
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 0xe15e99147de42bbc328a979a3d0380be419bdccf9defa8b0076fd82c9d553e60. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cffbf356-348b-4967-baf4-9eb6d3de1581.json and https://artists.proofprofile.net/proofs/artist/cffbf356-348b-4967-baf4-9eb6d3de1581.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).