What Underwriters Can Verify
Cyber-insurance questionnaires collect attestations. A deterministic per-action control is a different class of answer: one an assessor can verify independently. This post is about what the insured brings to the renewal conversation.
The questionnaire collects attestations
A renewal questionnaire asks whether MFA covers privileged actions, how exposed the estate is to session hijacking, and what forensic evidence an incident would produce. The answers are attestations. A checkbox states that a control exists. A signature at the bottom states that the checkboxes are honest. Nothing in the process verifies either, and both sides know it. The market prices that uncertainty the only way it can.
A different class of answer
A deterministic per-action control produces artifacts a third party can check without trusting anyone. The signatures are ES256, verifiable against published keys, so an assessor validates a proof on their own machine. The ledger is hash-chained with daily anchors, so tampering is a testable property rather than a claim: alter one record and every record after it breaks.
The control itself is per-action human proof on privileged operations, so "MFA on privileged actions" stops being a policy statement and becomes a stream of independently checkable objects.
What the insured brings to renewal
The renewal conversation changes shape. Instead of attesting, the insured hands over three things: a sample of the ledger, the published verification key, and the verification procedure. The assessor checks the artifacts directly. Questions that used to end in an attestation now end in a verification, and the insured controls which class of answer it brings to the table.
What this post does not claim
No claim here about premiums, insurability outcomes, or underwriting decisions. Those belong to the insurer's models and the insurer's judgment, and nothing in a security control changes who makes them. The claim is narrower. An attestation and a verifiable artifact are different classes of answer to the same question, and the difference is checkable by anyone with the key.
Common questions
Will this lower our premium?
We make no claim about pricing, insurability, or underwriting outcomes. The claim is about evidence class: the questions get answers an assessor can verify rather than accept.
What can an assessor verify without trusting us?
Signature validity against a published key, payload binding to the action parameters, and ledger chain integrity. All three are checkable independently.
Which questionnaire topics does this speak to?
MFA coverage on privileged actions, session-hijacking exposure, and forensic evidence quality, stated generically. What changes is that each becomes demonstrable per action.