Mavrin () is a Russian masculine surname, its feminine counterpart is Mavrina. It may refer to: Sergey Mavrin (born 1963), Russian heavy metal musician Sergey Mavrin (judge) (1951–2025), Russian judge
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 0x0459a8f5ef4c00ff16a3f00f3df40fd2346f4f22e9e95274362ec3e9d169fde0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3b2cbb62-e003-444e-bc0c-47cf1159f114.json and https://artists.proofprofile.net/proofs/artist/3b2cbb62-e003-444e-bc0c-47cf1159f114.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).