A hackman is a term for a coachman. Hackman may also refer to: Hackman (company), a cutlery firm founded in Finland in 1790 Hackman (surname), includes a list of people with the surname Hackman's Gat
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 0xb94b08344fbd3e006f13083a93c1d3393cccef8d01b2be8af2e8fe8ed994abc0. Chain 2 (Bitcoin): anchored in block 954603 (2026-06-20T21:47:54Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bfa7a204-1458-4a92-86ad-d5ecfad13a4c.json and https://artists.proofprofile.net/proofs/artist/bfa7a204-1458-4a92-86ad-d5ecfad13a4c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).