Joan Miró i Ferrà ( ,"Miró, Joan" (US) and , ; 20 April 1893 – 25 December 1983) was a Catalan painter, sculptor and ceramist from Spain. A museum dedicated to his work, the Fundació Joan Miró, was
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 0x17f0b373c747f804cbbbf14c56371227e155218efce71f3d76b776b2fd83c7dc. Chain 2 (Bitcoin): anchored in block 953864 (2026-06-16T00:30:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0567745b-9a4e-4ae4-81d5-0b6af8fabef4.json and https://artists.proofprofile.net/proofs/artist/0567745b-9a4e-4ae4-81d5-0b6af8fabef4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).