thumb|right|upright=1.3|A typical bento from a grocery store A is a single-portion take-out or home-packed meal of Japanese origin, often for lunch, typically including rice and packaged in a box wit
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 0x70ac72018745d4e5276c5ce8f1b0b77a58ef692df3568100389a9893b053df1f. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/551e6033-8f6e-4c96-aa2e-b5da7b21199c.json and https://artists.proofprofile.net/proofs/artist/551e6033-8f6e-4c96-aa2e-b5da7b21199c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).