bitcoin-ruby-p2wpkh

p2wpkh.rb

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

Bitcoin::network = :regtest

prev_tx = 'a6d52bb1b20b7fad41dad9b2bf4c25b76f8b18889f308a633ac82c913ca462aa'
out_index = 1
prev_script_sig = '76a91490a3e94240813b8b01859d9f2a12d028b53c44c788ac'
key = Bitcoin::Key.from_base58 'cU2ozeV3UcUTsmgmdywKJCjexjnQ53pASqov641zu5gBhu8uphsK'

pubkey = 'pubkey'
pubkey_hash = bitcoin_hash pubkey
bin_script = Bitcoin::Script.binary_from_string "OP_DUP OP_HASH160 #{pubkey_hash} OP_EQUALVERIFY OP_CHECKSIG"
hex_script =  bin_script.unpack 'H*'

tx = build_tx do |t|
  t.input do |i|
    i.prev_out prev_tx
    i.prev_out_index out_index
    i.prev_out_script prev_script_sig.htb
    i.signature_key key
  end

  t.output do |o|
    o.value 1999000000
    o.script do |s|
      s.type :witness
      s.recipient 0, hash160(hex_script[0])
    end
  end
end

p tx.to_payload.unpack('H*')