Yu or YU may refer to: Arts and entertainment Music Yu (wind instrument), an ancient Chinese free-reed mouth organ, larger than the sheng Yu (percussion instrument), an ancient Chinese musical inst
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 0x18ad210b0917721b949073477252d095428e1bcefa52e79de6416f6d9b811f43. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a103d928-57d0-44a2-ba2b-ca52ad0c9cfb.json and https://artists.proofprofile.net/proofs/artist/a103d928-57d0-44a2-ba2b-ca52ad0c9cfb.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).