Liqu () is a town in Baota District, Yan'an, Shaanxi, China. Liqu is located in the northeast of central Baota District, bordered by to its north, to its south, to its east, and Qiaogou Subdistrict
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 0x1bd8abc46660c906d228522b0e33c91f86a5ac4ca7f4f47fece7ed264f03fd94. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/37c628ad-7da0-4eda-b538-199411b814f0.json and https://artists.proofprofile.net/proofs/artist/37c628ad-7da0-4eda-b538-199411b814f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).