为什么我不能在Ruby中签署比特币交易？

Question

What is wrong with my code (I'm using this gem )?

require 'bitcoin'
include Bitcoin::Builder
key = Bitcoin::Key.from_base58('...')
txn = build_tx do |tx|
  tx.input do |i|
    i.prev_out(Bitcoin::P::Tx.from_hash(...))
    i.prev_out_index(0)
    i.signature_key(Bitcoin::Key.from_base58(...))
  end
  tx.output do |o|
    o.value(50000)
    o.to('1GzqkR2zNQUzHLpE7PLPjVNJ51FHC3bpDH')
  end
end

I'm getting:

RuntimeError: Script type must be hash160, pubkey, p2wpkh or multisig
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:239:in `sig_hash_and_all_keys_exist?'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:308:in `sign_input'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:208:in `block in tx'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:207:in `each'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:207:in `each_with_index'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:207:in `tx'
    /Users/yegor/.rvm/gems/ruby-2.6.0/gems/bitcoin-ruby-0.0.19/lib/bitcoin/builder.rb:21:in `build_tx'

What am I doing wrong? BTW, no matter what private key I provide to the signature_key I get the same error. If I remove the line with singature_key , I get no error.

I submitted a ticket to their repo too: https://github.com/lian/bitcoin-ruby/issues/287

Answer 1

The problem was with the format of the script. This code works:

utxo = # coming from https://www.blockchain.info/api/unspent
  builder.input do |i|
    i.prev_out(utxo['tx_hash_big_endian'])
    i.prev_out_index(utxo['tx_output_n'])
    i.prev_out_script = [utxo['script']].pack('H*')
    i.signature_key(key)
  end