let returnType: {
  domain: {
    readonly chainId: 10;
    readonly name: "Farcaster SignedKeyRequestValidator";
    readonly verifyingContract: "0x00000000FC700472606ED4fA22623Acf62c60553";
    readonly version: "1";
  };
  primaryType: "SignedKeyRequest";
  types: {
    readonly SignedKeyRequest: Array<{ name: string; type: string }>;
  };
};