is a city located in Chiba Prefecture, Japan. , the city had an estimated population of 63,190 in 26,204 households and a population density of 1800 persons per km². The total area of the city is .
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 Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b50a8cb0ea019919577941f3e372ec5a95525bbea0d8cd5fa0fc067a8fb7b77. Chain 2 (Bitcoin): anchored in block 953950 (2026-06-16T13:35:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/248256dd-e47b-44fc-a2bc-7dc59e8a37bb.json and https://artists.proofprofile.net/proofs/artist/248256dd-e47b-44fc-a2bc-7dc59e8a37bb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).