thumb|603x603px|Solo Performance in Eröffnungsfestival 100 Jahre Bauhaus, Berlin January 18, 2019 (c)Fotini Potamia Dine Doneff (born June 8, 1965), also known as Kostas Theodorou, is a Macedonian com
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 0x13e7fd8996bbd7077a3aae93c4bb04a98acd71d8b038ea301c054ada7d339ce1. 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/afe3c582-d08b-48dc-b913-4f75ce3077ce.json and https://artists.proofprofile.net/proofs/artist/afe3c582-d08b-48dc-b913-4f75ce3077ce.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).