Leshan, formerly known as Jiading and Jiazhou, is a prefecture-level city located at the confluence of the Dadu and Min rivers, on the southwestern fringe of the Sichuan Basin, about from Chengdu, Si
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 0xe299793e926e631bdef52ce0e1b53981d1d87ca3ee2af6f006b882f3d9ee187c. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7d99c7c-391e-421c-b844-9fe8857b18c2.json and https://artists.proofprofile.net/proofs/artist/d7d99c7c-391e-421c-b844-9fe8857b18c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).