Cong may refer to: Cong (vessel), is a form of jade artifact from ancient China Cong (surname), (叢/丛) a Chinese surname Cong, County Mayo, Ireland, a village Cong Weixi (1933–2019), Chinese author in
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 0xe818a0d2c73c7bcbfc44a62a4c1f08bac3f502891964c413c2dfc15d8d9d2996. Chain 2 (Bitcoin): anchored in block 953947 (2026-06-16T13:14:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/226ed7c4-0f93-42e8-8c25-f8e1e7bb00da.json and https://artists.proofprofile.net/proofs/artist/226ed7c4-0f93-42e8-8c25-f8e1e7bb00da.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).