thumb|upright=1.2|Family photograph of the Imperial House of Japan, the world's oldest continuous royal dynasty since at least the 5th century, with three generations (from left): Empress Michiko, Emp
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 0xcd150ebc597c957fac96ee2797d13e9349e92b59183d90ad88176873004b2cc0. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/964d2f92-93a9-497f-9b57-fe0e5ada52e5.json and https://artists.proofprofile.net/proofs/artist/964d2f92-93a9-497f-9b57-fe0e5ada52e5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).