200 px|right|thumb|Sergei Kristovsky, 2009 Uma2rman (previously Umaturman, Uma2rmaH) is a Russian pop rock band made up of two brothers, Sergei and Vladimir Kristovsky. They have been active since 200
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 0x45bc67719668cf95d456524d486a143c786004fb3e4ddd10c9636073879170be. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d63f1f76-d943-4662-82e8-a3938cd34360.json and https://artists.proofprofile.net/proofs/artist/d63f1f76-d943-4662-82e8-a3938cd34360.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).