Jin may refer to: States Jìn 晉 Jin (Chinese state) (晉國), major state of the Zhou dynasty, existing from the 11th century BC to 376 BC Jin dynasty (266–420) (晉朝), also known as Liang Jin and Sima Ji
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 0x929b2494ad280af5aa0ddb4c44e90d998e71a514199399386ee675bec1ad5504. 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/f3788581-907a-43f6-87f1-09110f12f993.json and https://artists.proofprofile.net/proofs/artist/f3788581-907a-43f6-87f1-09110f12f993.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).