Can commitments protect sensitive agent data while enabling verification?

The abstract says the architecture "creates blockchain-anchored cryptographic commitments for selected agent communications, human-in-the-loop approvals, tool calls, and process artifacts without placing sensitive content on-chain." The design choice sits in the last clause.

A chain is shared, durable, hard to edit and widely readable, which is a poor place for prompts, customer data or an approval with a name on it. A commitment is a fingerprint that binds a party to a value without revealing it. Later, anyone shown the content can check it against the anchor. So the proof lives on the chain and the content stays with the organization, and verifiability is separated from disclosure. That is the reasoning I read into the clause. The excerpt states the outcome and not the mechanism.

The separation has a cost that follows from it. Verification depends on the organization keeping the content. An anchor whose content is gone proves something nobody can produce. The anchor also shows only that content presented later matches what was committed. It does not show that the content presented is the content that mattered, which is the capture question in What can a blockchain anchor actually prove about records?.

The choice fits a hazard the vault already records. Do reasoning traces actually expose private user data? shows traces carrying sensitive values the model was told to withhold. Agent traces are exactly the artifacts one would want to anchor, and exactly the ones one would not want to publish.

What the excerpt does not give. The commitment scheme, how content is retained and who may inspect it, and what happens to a commitment when the content it binds has to be deleted. The last is my question and not the paper's.