p2sh transaction with bitcoin-ruby

p2sh.rb

# [WIP] sample of p2sh using bitcoin-ruby
# https://github.com/lian/bitcoin-ruby

require 'bitcoin'
include Bitcoin::Builder
include Bitcoin::Util

Bitcoin.network = :regtest

# Prepare elements
# Previous transaction
sender = Bitcoin::Key.from_base58 'cUMiRA75ze1kjUdsLfoNR4XXQ3iGoLhPXmrap88LKu1ybjX2bG78' #WIF
# Recipient
recipient = Bitcoin::Key.from_base58 'cVjhviGmo8rATiekEES2CMAYsNPxeagQeP5fbXkjHpjxTBdaN41K' #WIF
pubkey_hash = hash160 recipient.pub
redeem_script = Bitcoin::Script.to_hash160_script(pubkey_hash).unpack('H*').first
p2sh_address = encode_base58 redeem_script

tx = build_tx do |t|
  t.input do |i|
    i.prev_out 'ec4197176d9d9b32b983dcff861065c1f03d13bc6f43cebe169e679479863251' #Previous transaction id
    i.prev_out_index 0
    i.prev_out_script '76a914c7599dceb053650cdf7d4e184fc496cb542583c988ac'.htb
    i.signature_key sender
  end

  t.output do |o|
    o.value 199900000
    o.to p2sh_address, :p2sh
  end
end

# Transaction in hex
puts tx.to_payload.unpack('H*').first