thumb|right|Nyan Cat Nyan Cat is a YouTube video uploaded in April 2011, which became an Internet meme. The video merged a Japanese pop song with an animated cartoon cat with a Pop-Tart for a torso fl
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 0xb33187454de74cd742527fb3a6c7ec0684338c23dc6432cc466bd38dd9baf1ed. 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/de9fad07-61f7-4f35-97a5-5a21738dd228.json and https://artists.proofprofile.net/proofs/artist/de9fad07-61f7-4f35-97a5-5a21738dd228.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).