thumb|An old Nixdorf ATM in Germany () thumb|right|Smaller indoor ATMs dispense money inside convenience stores and other busy areas, such as this off-premises Wincor Nixdorf mono-function ICA ATM in
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 0x032e53262555add09c4dd5d9c7b4fee7b5d34bd629dac5989e2f47e1e36822db. Chain 2 (Bitcoin): anchored in block 953928 (2026-06-16T10:21:55Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1d4fc7d2-b6d0-4b56-8775-c1e69997a7c4.json and https://artists.proofprofile.net/proofs/artist/1d4fc7d2-b6d0-4b56-8775-c1e69997a7c4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).