keep-tecdsa - Change state-mutability of checkSignatureFraud to view
```\\nfunction submitSignatureFraud(\\n    uint8 \\_v,\\n    bytes32 \\_r,\\n    bytes32 \\_s,\\n    bytes32 \\_signedDigest,\\n    bytes calldata \\_preimage\\n) external returns (bool \\_isFraud) {\\n    require(publicKey.length != 0, "Public key was not set yet");\\n\\n    bytes32 calculatedDigest = sha256(\\_preimage);\\n    require(\\n        \\_signedDigest == calculatedDigest,\\n        "Signed digest does not match double sha256 hash of the preimage"\\n    );\\n\\n    bool isSignatureValid = publicKeyToAddress(publicKey) ==\\n        ecrecover(\\_signedDigest, \\_v, \\_r, \\_s);\\n\\n    // Check if the signature is valid but was not requested.\\n    require(\\n        isSignatureValid && !digests[\\_signedDigest],\\n        "Signature is not fraudulent"\\n    );\\n\\n    return true;\\n}\\n```\\n
Declare method as `view`. Consider renaming `submitSignatureFraud` to e.g. `checkSignatureFraud` to emphasize that it is only checking the signature and not actually changing state.
```\\nfunction submitSignatureFraud(\\n    uint8 \\_v,\\n    bytes32 \\_r,\\n    bytes32 \\_s,\\n    bytes32 \\_signedDigest,\\n    bytes calldata \\_preimage\\n) external returns (bool \\_isFraud) {\\n    require(publicKey.length != 0, "Public key was not set yet");\\n\\n    bytes32 calculatedDigest = sha256(\\_preimage);\\n    require(\\n        \\_signedDigest == calculatedDigest,\\n        "Signed digest does not match double sha256 hash of the preimage"\\n    );\\n\\n    bool isSignatureValid = publicKeyToAddress(publicKey) ==\\n        ecrecover(\\_signedDigest, \\_v, \\_r, \\_s);\\n\\n    // Check if the signature is valid but was not requested.\\n    require(\\n        isSignatureValid && !digests[\\_signedDigest],\\n        "Signature is not fraudulent"\\n    );\\n\\n    return true;\\n}\\n```\\n