contracthashtool-ruby

gem 'contracthashtool'

require 'contracthashtool'
require 'bitcoin'

Bitcoin.network = :testnet3

# Example parameters from the original tool's usage().

redeem_script_template = '5121038695b28f1649c711aedb1fec8df54874334cfb7ddf31ba3132a94d00bdc9715251ae'
payee_address = 'mqWkEAFeQdrQvyaWNRn5vijPJeiQAjtxL2'
nonce_hex = '3a11be476485a6273fad4a0e09117d42'
private_key_wif = 'cMcpaCT6pHkyS4347i4rSmecaQtLiu1eH28NWmBiePn8bi6N4kzh'

# Someone wanting to send funds to the sidechain would call this
# to calculate a P2SH address to send to. They would then send the
# MDFs (mutually distrusting functionaries) the target address
# and nonce so they are able to locate the subsequent transaction.
# The caller would then send the desired amount of coin to the P2SH
# address to initiate the peg protocol.

nonce, redeem_script, p2sh_address =
  Contracthashtool.generate(redeem_script_template, payee_address, nonce_hex)

puts "nonce: #{nonce}"
puts "P2SH address: #{p2sh_address}"
puts "new redeem script: #{redeem_script}"

# Each MDF would call this to derive a private key to redeem the
# locked transaction.

key = Contracthashtool.claim(private_key_wif, payee_address, nonce)
puts "new privkey: #{key.to_base58}"

# Verify homomorphic derivation was successful.

signature = key.sign_message("derp")
script = Bitcoin::Script.new([redeem_script].pack("H*"))
pubkey = Bitcoin::Key.new(nil, script.get_multisig_pubkeys.first.unpack("H*").first)
raise "nope" unless pubkey.verify_message(signature, "derp")