R2, R02, R.II, R.2 or R-2 may refer to: Entertainment R2 (Rock'n'Reel), a British music magazine R2-D2, a character from Star Wars films and books, nickname R2 Code Geass: Lelouch of the Rebellion
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 0xcaae7b7020273116e8b6995bc877b7339c8d9e2889ce179c756967e5324510c8. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/28f04f3b-4029-495e-8daf-8d11ffaecb7d.json and https://artists.proofprofile.net/proofs/artist/28f04f3b-4029-495e-8daf-8d11ffaecb7d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).