Keiju (written: 啓珠 or 桂樹) is a masculine Japanese given name. Notable people with the name include: (born 1971), Japanese footballer (1923–2010), Japanese actor (born 2006), Japanese singer Categ
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 0x73281b5c4bb572671f6bfc13b1b5c46734170fe6b610c5e6948cfb7e6cd20dc9. Chain 2 (Bitcoin): anchored in block 954043 (2026-06-17T04:15:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3ebde199-f867-4564-a72b-59650dccf93e.json and https://artists.proofprofile.net/proofs/artist/3ebde199-f867-4564-a72b-59650dccf93e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.