Loudi () is a prefecture-level city located in central Hunan province, China. It is situated about southwest of the provincial capital of Changsha and is considered to be a small- to medium-sized cit
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 0x6d18c9a9c5d1482e5b1b7dc61615fd1799eed3fa37caad9da8486cdd76caaa09. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9c13305a-01c3-404f-80ba-26287b627c95.json and https://artists.proofprofile.net/proofs/artist/9c13305a-01c3-404f-80ba-26287b627c95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).