Jeff MacKinnon (born ) is a Canadian commercial diver, shipwreck salvager, Treasure Hunter and television personality based in Cape Breton, Nova Scotia. He is the founder and leader of Sub Sea Salvage
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 0xa9f288546e0003f57101a81145852d8c1be04481deb5e86eff2a6404ec140319. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b226b33c-765f-477e-99cb-d5e51f0ab928.json and https://artists.proofprofile.net/proofs/artist/b226b33c-765f-477e-99cb-d5e51f0ab928.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).