UMRA stands for: Republican Antifascist Military Union (Unión Militar Republicana Antifascista), during the Second Spanish Republic Unfunded Mandates Reform Act of 1995, United States legislation
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 0x4fadf8c4ce746e4a1fe142b206f2586af483cd85b86d6420e3ef5264e47306a1. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a35e8c01-bf33-465f-9406-ab13d017b82e.json and https://artists.proofprofile.net/proofs/artist/a35e8c01-bf33-465f-9406-ab13d017b82e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).