thumb|300px|Nuna 3 at Circuit Park Zandvoort Nuna is the name of a series of crewed solar powered race cars that have won the World Solar Challenge in Australia eight times: in 2001, 2003, 2005, 2007
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 0x4fbfc2bcc2623c2a3ea00aa1c7de0a31bb1a29848907aacadf67ef818546deb5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c1b3a28-5b6c-4dc7-bbba-4231208a053a.json and https://artists.proofprofile.net/proofs/artist/7c1b3a28-5b6c-4dc7-bbba-4231208a053a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).