Christopher Andrew Tsangarides (17 August 1956 – 6 January 2018) was a British record producer, sound engineer and mixer of Greek Cypriot origin. He was best known for his work with many heavy metal 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 0xa4cf6db7b686b7b153dfcbb28cc3c1d4c16903eba23d3368e41abecb4d7d7ff2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/49f08b08-3fda-451d-b63a-ba2289f2e91d.json and https://artists.proofprofile.net/proofs/artist/49f08b08-3fda-451d-b63a-ba2289f2e91d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).