Cafiero is an Italian surname. Notable people with the surname include: Antonio Cafiero (1922–2014), Argentine politician Carlo Cafiero (1846–1892), Italian anarchist Claudio Cafiero (born 1989),
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda34d5f5147ba3871e5681b7026e0a185f1493fad3c104bd6a5706ffcdc793d5. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/91376dce-da01-4fa3-8c46-2d90bfbf5a5d.json and https://artists.proofprofile.net/proofs/artist/91376dce-da01-4fa3-8c46-2d90bfbf5a5d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).