Chihiro (ちひろ, チヒロ,千尋) is a female and male Japanese given name. Written forms Chihiro can be written using various kanji, which can alter the name's meaning: 千尋, "thousand fathoms" 千博, "thousand ga
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 0xbe5af8dfe0a20e337939d64881a9ad44fbe3bd4eb8743ed62b37b5d4d16faeb0. Chain 2 (Bitcoin): anchored in block 954533 (2026-06-20T08:57:02Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6cf1a84-83e0-4112-a263-4389c4a9118b.json and https://artists.proofprofile.net/proofs/artist/a6cf1a84-83e0-4112-a263-4389c4a9118b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).