is a water polo player from Japan. He was the captain of the Japanese team at the 2016 Summer Olympics, where the team was eliminated in the group stage. References External links Category:Japan
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 0x8704923a03092fd357000ce939d66c12bb83c8a8ba7a28982668943ece5f0e7d. Chain 2 (Bitcoin): anchored in block 953721 (2026-06-15T01:12:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8aa498b0-2900-45de-9d16-67a104c6e6d3.json and https://artists.proofprofile.net/proofs/artist/8aa498b0-2900-45de-9d16-67a104c6e6d3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).