Aju (or Achu; Khalkha Mongolian: ; ) (1227–1287) was a general and chancellor of the Mongol Empire and the Yuan dynasty. He was from the Jarchud clan of the Mongol Uriankhai. His father was Yuan dynas
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd830ae0479594bde5e0117229731039c6ff21fd3f55b08c8b15761d687fc0c. Chain 2 (Bitcoin): anchored in block 953660 (2026-06-14T17:20:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5223ae4a-52d4-4eae-b4b6-597cb6976b7a.json and https://artists.proofprofile.net/proofs/artist/5223ae4a-52d4-4eae-b4b6-597cb6976b7a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).