Wu may refer to: Places Wu River (disambiguation), various rivers in China All of the following derive from the Chinese name , written in simplified characters and pronounced in Standard Mandarin
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 0xef7172aeca6a4256cb89b8f0f8340d12a19bcc349082468d8483139e4e9ee6cf. Chain 2 (Bitcoin): anchored in block 953588 (2026-06-14T04:52:46Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/00957a91-b5fe-41b9-b45e-12e5b8440df3.json and https://artists.proofprofile.net/proofs/artist/00957a91-b5fe-41b9-b45e-12e5b8440df3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).