Juan Blanco (June 29, 1919 in Mariel, Cuba – November 5, 2008 in Havana) was the first Cuban composer to utilize electroacoustics, spatial music and multimedia.Orovio, Helio. Cuban music from A to Z.
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 0x37a66b265b227871209fc51cb5bd327aa6c2fcb86c5faf09d45e3c580c2c40d6. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f01f15c0-d729-4641-b1d2-188465436e97.json and https://artists.proofprofile.net/proofs/artist/f01f15c0-d729-4641-b1d2-188465436e97.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).