message: changing error type based on feedback
diff: @@ -128,7 +128,7 @@ export class Trx extends BaseCoin {
  */
  deriveKeyWithSeed({ key, seed }: { key: string; seed: string }): { derivationPath: string; key: string } {
  // TODO: not sure if we need this just yet
  - throw new Error();
  + throw new MethodNotImplementedError();
  }
  /**
  