El Tropicana Night Club in Havana, Cuba located in a lush, estate tropical garden opened on December 30, 1939 at the Villa Mina in Marianao. It is located next door to the old Colegio de Belén, Havan
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 0x5f0765317bd8aa79972555b7692b2d188669b183b8e46fe4a98697d5f3a69959. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1c400a1b-584a-4f22-bafd-35af2432759e.json and https://artists.proofprofile.net/proofs/artist/1c400a1b-584a-4f22-bafd-35af2432759e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).