thumb|Tōnō region (red) in Gifu Prefecture is the southeastern portion of Gifu Prefecture in the Chūbu region of Japan. The Tōnō region received its name as a combination of the kanji for "east" (東)
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 0x1ea66e11c5dc665f2a0cce763af138330e5da3b4f2a1cce0b02aa9840f1117c7. Chain 2 (Bitcoin): anchored in block 954062 (2026-06-17T07:39:10Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/46a18c00-1d85-4933-9281-3897872c0e42.json and https://artists.proofprofile.net/proofs/artist/46a18c00-1d85-4933-9281-3897872c0e42.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).