thumbnail|right|upright=1.2|Typex was based on the commercial Enigma machine, but incorporated a number of additional features to improve the security. This model, a Typex 22, was a late variant, inco
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 0x116eff3638a86d5b0b6a97ebcc4001a391e814d81913f3ab057b9b8da971133e. 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/8f09a454-5358-4ac1-951d-67fd8296f4d2.json and https://artists.proofprofile.net/proofs/artist/8f09a454-5358-4ac1-951d-67fd8296f4d2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).