thumb|right|Joseph Edler von Eybler, 1846 Joseph Leopold Eybler (8 February 1765 – 24 July 1846) was an Austrian composer and contemporary of Wolfgang Amadeus Mozart. Life Eybler was born into a musi
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 0x86ba544a4720da4f7cf14b42aefaa512856420c71576ca15c83b4081599e60b5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/80276a6f-576f-4f04-9779-bb5b964be883.json and https://artists.proofprofile.net/proofs/artist/80276a6f-576f-4f04-9779-bb5b964be883.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Eybler: String Trio, HV 197 & String Quintet, HV 188