Yuma can refer to: Places United States Yuma County, Arizona Yuma, Arizona Marine Corps Air Station Yuma Yuma Proving Ground Yuma Proving Ground, Arizona (CDP) Yuma Territorial Prison Fort
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 0xfa1c822614e71601b4df6650b29475c26e7a396dfb23ca32d9b62a0d9b8d59d8. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f4208239-53e9-441f-b0ea-7d0b47ed3eb5.json and https://artists.proofprofile.net/proofs/artist/f4208239-53e9-441f-b0ea-7d0b47ed3eb5.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).