right|thumb|200px|A depiction of an onikuma by Shunsensai Takehara in the Ehon Hyaku Monogatari An onikuma (鬼熊, literally "demon bear") is a mythological Japanese yōkai originating in the Kiso Valley
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 0x30daacafb2e6de658547c3590d4b24d822ba9fe5b1afb120d7e0271482a0228b. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1af2b269-6a15-4e01-9e90-6e28951f2687.json and https://artists.proofprofile.net/proofs/artist/1af2b269-6a15-4e01-9e90-6e28951f2687.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).