Zafra (; ) is a town in the Province of Badajoz (Extremadura, Spain), and the capital of the comarca of Zafra - Río Bodión. It has a population of 16,677, according to the 2011 census. Zafra is the h
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 0x684a16ae71c628d0ac8f15f9596f4d40d99094f1bd165ec6563874e593523b33. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/004fadfa-e608-413b-9c70-b6442001ddf1.json and https://artists.proofprofile.net/proofs/artist/004fadfa-e608-413b-9c70-b6442001ddf1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).