Maybe use some builder or struct pattern

[raphjaph]

pub struct Foo {
  pub adddress: Address,
  pub message: Vec<u8>,
  pub signature: Transaction,
}

// could also be builder pattern
impl Foo {
  fn verify(&self) -> Result<()> {
    todo!()
  }

  fn from_base64(address: &str, message: &str, signature: &str) -> Result<Self> {
    todo!()
  }
}