Toshimaru Nakamura is a Japanese musician, active in free improvisation and onkyokei. He began his career playing rock and roll guitar, but gradually explored other types of music, even abandoning gu
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 0x6e342be4a2ecaa8c173dc9752a6c124d28f40080b8c9223f2f4051082bc85cfe. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/38de27cf-227a-42c6-99de-ec43e9ab5a58.json and https://artists.proofprofile.net/proofs/artist/38de27cf-227a-42c6-99de-ec43e9ab5a58.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).