Giorgio Theologitis (20 December 1888 - 22 June 1997), professionally George T. Katsaros, was a Greek-American rebetiko singer, songwriter and guitarist, known for compositions of romantic ballads in
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 0x9598cf6bbcb61795ad1449cf8f3b56417226cca847f95da05daa5a9927a00a0c. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4233294f-f4de-4419-95cc-5406bf022b16.json and https://artists.proofprofile.net/proofs/artist/4233294f-f4de-4419-95cc-5406bf022b16.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
George Katsaros: Greek Blues in America, Vol. 1