<!-- 0Gkit docs — ATTESTATION_BAD_SIGNATURE
     Source: https://docs.0gkit.com/errors/ATTESTATION_BAD_SIGNATURE
     LLM-friendly Markdown twin of the page. -->

# ATTESTATION_BAD_SIGNATURE

**Attestation signature did not recover**

## What happened

The signature on a TEE attestation envelope didn't recover to the expected signer address — either tampering or a key mismatch.

## How to fix

Confirm you're verifying against the right signer. For the testing fixture, use `FIXTURE_ATTESTATION_SIGNER`. For a real provider, fetch the provider's signing address from its public registry entry.

## Example

```ts
import { verifyEnvelope } from "@foundryprotocol/0gkit-attestation";
const ok = verifyEnvelope(signed, expectedSigner);
```

## Reference

- Namespace: `ATTESTATION`
- Help URL: `https://0gkit.com/errors/ATTESTATION_BAD_SIGNATURE`
- See also: [all error codes](/errors)