Agencia EFE, S.A. () is a Spanish international news agency, the major Spanish-language multimedia news agency and the world's fourth largest wire service after the Associated Press, Reuters, and Agen
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 0xc6dd5eea4a34640311e1b08f82fab4cea48849e5f1483b2593f32319bd8e9522. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a1b1c1b6-d25a-4e01-b7bf-0aa206c72cb5.json and https://artists.proofprofile.net/proofs/artist/a1b1c1b6-d25a-4e01-b7bf-0aa206c72cb5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).