Ubre Blanca (1972–1985) was a cow in Cuba known for her prodigious milk production. The cow, along with the "Cordón de La Habana" coffee plantations, the Voisin pasture system, and the microjet irrig
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 0xc6742dda69eea8764be7bc9d9b75d105f75e998ea9ccf9876122f32ed21b6e56. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2d1a3598-3eb4-4d27-8b97-b9af76817d95.json and https://artists.proofprofile.net/proofs/artist/2d1a3598-3eb4-4d27-8b97-b9af76817d95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).