The Hong Kong Association of Freight Forwarding & Logistics Ltd (HAFFA) is a non-profit organization which promotes, protects and develops the carriage of goods (whether by air, sea or land) generally
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 0x839370bd58f99b477bc6d975cb8ce71c11b6126edc3f0794896b7b2b49660728. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67572d19-b4e2-4b0c-af11-c233a4a59d19.json and https://artists.proofprofile.net/proofs/artist/67572d19-b4e2-4b0c-af11-c233a4a59d19.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).