Dámaso Pérez Prado (December 11, 1916 – September 14, 1989) was a Cuban bandleader, pianist, composer and arranger who popularized the mambo in the 1950s.On Becoming Cuban: Identity, Nationality, and
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 0x02b86b8225f721bcc70f80b4404d5cee6b45a781a3a0edc7bf5235c8d8d7109c. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d94ddf8-08ce-4431-854c-5ec2915fce81.json and https://artists.proofprofile.net/proofs/artist/6d94ddf8-08ce-4431-854c-5ec2915fce81.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.