R4, R04, R.4, R-4, or R/4 may refer to: Military Aircraft Caudron R.4, World War I French reconnaissance aircraft, first flown in 1915 Curtiss R-4, air ambulance version of the American Curtiss Mod
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b7f4c782486e95184483a6f344939bfdf3fb8b70648c3b08522cddf6c6d0412. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c1204088-5afc-47d5-b4d9-0c9360165605.json and https://artists.proofprofile.net/proofs/artist/c1204088-5afc-47d5-b4d9-0c9360165605.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).