Mack may refer to: People Mack (given name) Mack (surname) Reinhold Mack, German record producer and sound engineer, often credited as simply "Mack" Michael Harris Mack,1935, born in New York City R
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 0x5a596a3ff4306224290d98d7ecfc8d5ad47bec73393b319c73d4539c8d4fbd3b. Chain 2 (Bitcoin): anchored in block 953819 (2026-06-15T18:31:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fbd5e264-cc4a-4ee4-8c33-06ba33da9790.json and https://artists.proofprofile.net/proofs/artist/fbd5e264-cc4a-4ee4-8c33-06ba33da9790.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).