Ansu may refer to: Ansu apricot, a common name for Prunus armeniaca Ansu, Hebei, a town in Xushui District, Hebei, China Ansoo Lake, a mountain lake in the Khyber-Pakhtunkhwa province of Pakistan
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 0x0f49101555d94756d6126b8d0d7d34212425863551ee1ff2c28059f5e9900c00. Chain 2 (Bitcoin): anchored in block 953713 (2026-06-15T00:33:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/858251b8-c25e-4c10-bf51-ab7f2f078086.json and https://artists.proofprofile.net/proofs/artist/858251b8-c25e-4c10-bf51-ab7f2f078086.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).