Boris Karlov (; August 11, 1924 – December 14, 1964) was a Bulgarian accordionist. He was born in Sofia into a Romani (Gypsy) family. His father Karlo Aliev conducted an orchestra that was often heard
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 0xd0fa7b1e0ee839e9fd856b7e42127ff87f16d467961534bb8811e03797a623a5. 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/afe1d4f6-f3f0-4018-8e91-2323dae0a060.json and https://artists.proofprofile.net/proofs/artist/afe1d4f6-f3f0-4018-8e91-2323dae0a060.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).