def send_bitcoin(from, amount, to, fees = nil, mode = 'broadcast', output_qty = 1)
      validate_address([from, to])
      colored_outputs = get_unspent_outputs([from])
      btc_transfer_spec = OpenAssets::Transaction::TransferParameters.new(colored_outputs, to, from, amount, output_qty)
      tx = create_tx_builder.transfer_btc(btc_transfer_spec, fees.nil? ? @config[:default_fees]: fees)
      process_transaction(tx, mode)
    end
def send_bitcoin(from, amount, to, fees = nil, mode = 'broadcast', output_qty = 1)
      validate_address([from, to])
      colored_outputs = get_unspent_outputs([from])
      btc_transfer_spec = OpenAssets::Transaction::TransferParameters.new(colored_outputs, to, from, amount, output_qty)
      tx = create_tx_builder.transfer_btc(btc_transfer_spec, fees.nil? ? @config[:default_fees]: fees)
      process_transaction(tx, mode)
    end
Creates a transaction for sending bitcoins from an address to another.
 @param[String] from The address to send the bitcoins from.
 @param[Integer] amount The amount of satoshis to send.
 @param[String] to The address to send the bitcoins to.
 @param[Integer] fees The fess in satoshis for the transaction.
 @param[String] mode 'broadcast' (default) for signing and broadcasting the transaction,
 'signed' for signing the transaction without broadcasting,
 'unsigned' for getting the raw unsigned transaction without broadcasting"""='broadcast'
 @param [Integer] output_qty The number of divides the issue output. Default value is 1.
 Ex. amount = 125 and output_qty = 2, asset quantity = [62, 63] and issue TxOut is two.
 @return[Bitcoin::Protocol:Tx] The resulting transaction.