Stelios Perpiniadis (; 14 May 1899 – 4 September 1977), better known as Stellakis (Greek: Στελλάκης), was a Greek folk musician who wrote, sang, and played guitar in the rebetiko style. He was the fat
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f64d34b4d4c6fe526f95ee38bab833eb91a8adfc91dde3d71ccdb76be69f281. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be23b587-75c0-48a6-8f0e-37a6cc831b8b.json and https://artists.proofprofile.net/proofs/artist/be23b587-75c0-48a6-8f0e-37a6cc831b8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).