Adolfo Guzmán (May 13, 1920 – July 30, 1976) was a Cuban pianist, music director, arranger and composer. During his 40-year-long career he directed several important Cuban ensembles, including Orquest
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 0xef7a56ee704ef13a28fd275d548a31de8066eb7ea7d66fb56483b1b5ba57f42a. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3bb57885-efda-44f0-9f88-953250641569.json and https://artists.proofprofile.net/proofs/artist/3bb57885-efda-44f0-9f88-953250641569.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).