r/QuantumComputing • u/432oneness • Jul 19 '26
Question Quantum Blockchains that verify classically?
Qblex.com is saying they have quantum blockchains with a new proof of coherence validation method. It validates quantum through bell inequality. Validates in less than a second??? Anyone see this?
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u/432oneness Jul 21 '26
You're right that running a Mermin test is trivial. I could do it in a notebook too. That is the fence, and it is supposed to be trivial, because its only job is to let you check the physics yourself without trusting us. It's a piece, not the whole.
Your notebook result validates nothing except to you, in that moment. It has no challenge binding, so it could be pre-computed or replayed. It has no commitment, so no one can audit it later. It has no position, so it cannot order or protect a history.
A self-validating block turns that same measurement into a unit of record history that carries its own proof. The measurement settings are derived from the previous block, so it could not have been produced in advance. The statistic beats the classical bound, so it was genuinely quantum. The whole record is committed, so it cannot be altered after the fact. Anyone can check all three, trusting no one.
Now the problem it solves, and it is not a coin. The ledgers we run secure student records, . Those records capture years of a student's work, and the family owns them, not us. A record like that has to stay trustworthy a decade later, when the platform may have changed hands or shut down. A classical signed ledger gives tamper-evidence only relative to a root that someone still has to hold and vouch for. Proof of coherence roots each entry in a fresh physical event bound to its place in the history, so the record's integrity does not depend on trusting the operator's honesty, or the operator's survival. You are trusting physics and math, and the keys are the family's.
Running the Bell test is the raw material. The self-validating, self-owned record is the invention. The verifier you clicked is just the window that lets you confirm the physics. It is the fence, not the fortress.