Hiro may refer to: People Hiro (given name), includes lists of people with the given name Hiro (photographer) (1930–2021), Japanese-born American photographer Hiro (singer) (born 1991), French sin
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 0x201b78ed2d06d8a0a8757e8291b0dfbf5e222fa399ef1ddf2a1754eafe19c90b. Chain 2 (Bitcoin): anchored in block 954659 (2026-06-21T06:14:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dd8aa439-17f3-45cb-a347-dbcdbc808507.json and https://artists.proofprofile.net/proofs/artist/dd8aa439-17f3-45cb-a347-dbcdbc808507.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).