class Eth::Tx

def initialize(params)
  fields = {v: 0, r: 0, s: 0}.merge params
  fields[:to] = Utils.normalize_address(fields[:to])
  if params[:data]
    self.data = params.delete(:data)
    fields[:data_bin] = data_bin
  end
  serializable_initialize fields
  check_transaction_validity
end