Replay resistance, theft-worthlessness, and a clean audit trail — all from one property: a proof that works exactly one time.
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Trustplane proofs carry a nonce and a tight expiry, and the boundary remembers what it has already seen. A proof that verifies successfully is consumed — replaying it is an automatic refusal.
First, replay attacks stop existing. Captured traffic can't be re-fired at your API hours later, because the proofs in it are already spent.
Second, theft becomes worthless. An exfiltrated proof is valid for seconds, bound to one caller and one action — the opposite of a leaked API key that's powerful for months.
Third, audit gets simple. Every request maps to exactly one proof, and every proof to exactly one decision. Your log is a ledger of verdicts, not a pile of session events.
Every request proves itself — no keys, anywhere.
Put the boundary in front of one API and measure it yourself.