Barrio (; ) is generally defined as each area of a city delimited by functional (e.g., residential, commercial, industrial, etc.), social, architectural or morphological features. In Spain, in most of
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 0xf12c327628965536c4dafeb892b91bf13fcb66fe1927dc424448e90b215e9296. Chain 2 (Bitcoin): anchored in block 953909 (2026-06-16T07:53:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/108858d0-3922-457a-92e6-faf3d42faa02.json and https://artists.proofprofile.net/proofs/artist/108858d0-3922-457a-92e6-faf3d42faa02.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).