Yujia may refer to: Yujia Township, Hebei (于家乡), in Jingxing County Yujia Township, Jiangxi (余家乡), in Guixi Li Yujia (李羽佳; b. 1983), Chinese Singaporean female badminton player Yuja Wang (王羽佳; b.
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 0x51b57dcb53a46d6d5df91bd1ebd5f18b0917abd3b6153a32bd9d919fd8c87512. Chain 2 (Bitcoin): anchored in block 954717 (2026-06-21T15:47:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f59ba8e9-dca8-417b-8593-535f03ed1f8c.json and https://artists.proofprofile.net/proofs/artist/f59ba8e9-dca8-417b-8593-535f03ed1f8c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).