Fabrizio Tarducci (born 17 October 1976), known professionally as Fabri Fibra, is an Italian rapper. In his career he has sold more than 2.3 million certified copies. Biography Tarducci was born in S
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 0x091b01c8958f1efb3f2486c78da1cb0b787836e068d5dd3fbaa5007f52fb8854. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5311ea2e-a872-4678-9ab9-e992d2926dc7.json and https://artists.proofprofile.net/proofs/artist/5311ea2e-a872-4678-9ab9-e992d2926dc7.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).