is the second-largest city in Japan by population as well as by area, and the country's most populous municipality. It is the capital and most populous city in Kanagawa Prefecture, with a population
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 0x11f5d62158171a6f39e88eba0e7fb7a49e30880304a043e96804a95a1088f916. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd11d3b0-c708-4474-8ba5-29580dd94073.json and https://artists.proofprofile.net/proofs/artist/fd11d3b0-c708-4474-8ba5-29580dd94073.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).