thumb|Arbiter Fuzz Face, ca. 1967 The Fuzz Face is a fuzz-style distortion pedal designed for electric guitar by Ivor Arbiter and released in 1966. Arbiter designed the Fuzz Face as a simplified vers
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 0x8a0ac73fc5bc7d7bc2e5a59b8f4f7bf686887dd13dbc8ff5a101d2f34a96b858. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b90384ff-3637-4d6f-a7dc-9dfd7092aa92.json and https://artists.proofprofile.net/proofs/artist/b90384ff-3637-4d6f-a7dc-9dfd7092aa92.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).