thumb|Alexander Sladkovsky in 2022 Alexander Sladkovsky (born 20 October 1965) is a Russian conductor. He is the chief conductor and artistic director of the Tatarstan National Symphony Orchestra. He
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 0x9374adfb5b1ea3abd11a3040b6eb0079bd2538b114dfef1ccc29f7357341a7f3. Chain 2 (Bitcoin): anchored in block 953972 (2026-06-16T16:31:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/29f5ec04-04b9-4e69-9746-60be23e137ba.json and https://artists.proofprofile.net/proofs/artist/29f5ec04-04b9-4e69-9746-60be23e137ba.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).