Bakuto (博徒) were itinerant gamblers active in Japan from the 18th century to the mid-20th century. They were one of two forerunners (the other being tekiya, or peddlers) to modern Japanese organized
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 0x6ebbd2e44df55da1774c16055361a4d7544c3d842600fb24ca1f2e3392cfc8ea. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b779f539-627f-4651-8b15-6267be1ec1d4.json and https://artists.proofprofile.net/proofs/artist/b779f539-627f-4651-8b15-6267be1ec1d4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).