Calliope Tsoupaki (; born 27 May 1963) is a Greek pianist and composer. Biography Calliope Tsoupaki was born in Piraeus, Greece. She studied piano and music theory at the Hellinicon Conservatory in A
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 0x26fbc692c5261ddd71fd320bef943636599b87d238a84c3efea349041bce9d3d. 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/60ed6b2b-8b1a-44f0-8f94-da43d179faa7.json and https://artists.proofprofile.net/proofs/artist/60ed6b2b-8b1a-44f0-8f94-da43d179faa7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).