Why LETHE exists

Every AI request you make today leaves a paper trail. Your prompt is logged, tied to your account or API key, retained indefinitely, and protected by nothing stronger than a privacy policy you didn’t read and can’t verify. “Trust us” is the entire security model. LETHE starts from a different premise: privacy should be structural, not promised. Not a policy the operator chooses to honor, but a property of the system that holds even if the operator wanted to break it. That premise breaks down into three pillars.

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1. No identity tied to the request

A prompt encrypted client-side and paid for per-call in USDC over x402, with no account and no API key linking it back to you. Nothing to subpoena, nothing to breach, because there’s no identity attached to unlink in the first place.

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2. Attested execution

Inference runs inside a Trusted Execution Environment (TEE), an isolated enclave where even LETHE’s own infrastructure cannot read the prompt or the output while it’s being processed. The operator is architecturally excluded, not just contractually restrained.

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3. Verifiable deletion

Instead of a policy that says “we delete your data,” a cryptographic attestation proves the request ran in an isolated enclave and was discarded afterward. Verifiable, not promised.

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What this means in practice

Most AI products ask you to trust that logs won’t leak, that “we don’t train on your data” holds forever, and that a privacy policy won’t quietly change. LETHE’s bet is that none of that should require trust: the architecture itself should make the alternative (logging, retaining, training on your prompts) structurally impossible, not just against the rules.

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Where LETHE is today

This is the mission the product is built toward, not a claim about every line of the system as it stands right now. Building attested, verifiable infrastructure takes time to get right, and LETHE is honest in these docs about the gap between the two: The Roadmap section tracks that gap page by page, plainly, so you know exactly what you can rely on right now versus what’s being built.