Antonis Papadakis, or Kareklas (1893–1980) was a Cretan musician and famous for his lyra performance. He was born in Pervolia, Rethymno, then part of the Ottoman Empire. He started playing the lyra 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 0x7710f296bc5f0114050b78371d51ac02c1286bbb763c0aebfcf005a0e7a52d93. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ef6c5675-720b-48e1-9a35-1b6df322e926.json and https://artists.proofprofile.net/proofs/artist/ef6c5675-720b-48e1-9a35-1b6df322e926.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).