I’m using this library: https://github.com/lian/bitcoin-ruby
And here’s my code:
require 'open-uri'
require 'net/http'
require 'net/https'
require 'json'
require 'bitcoin'
Bitcoin.network = :testnet3
def get_response(prev_tx)
url = "https://testnet.blockexplorer.com/api/rawtx/#{prev_tx}"
uri = URI(url)
response = Net::HTTP.get(uri)
response = JSON.parse(response)
response = response['rawtx'].to_s
return response
end
def build_transaction(prev_tx, prev_out_index, key, satoshi_to_spend, addr, message)
include Bitcoin::Builder
new_tx = build_tx do |t|
t.input do |i|
i.prev_out prev_tx
i.prev_out_index prev_out_index
i.signature_key key
end
t.output do |o|
o.value satoshi_to_spend
o.script {|s| s.type :address; s.recipient addr }
end
end
puts ""
puts "--- new tx ---"
puts new_tx.to_json
return new_tx
end
def bin_to_hex(s)
s.unpack('H*').first
end
bitcoin_key_1_pub = "0367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7ca"
bitcoin_key_1_priv = "*****24c56528becd02d23076123a2edc2f3cf52c3c0202178c1b7fa9ac*****"
bitcoin_key_1_addr = "mxz4hu6JrTHevn22W4GDVjS3ko9MwXuHND"
# the previous transaction that has an output to your address #1
prev_tx_1 = "427138ed5f2443fbfbf8065e990f1bf9ce0236e14376e8abca0b2876eabca653"
# the number of the output you want to use
prev_out_index = 1
# 0.5 BTC in satoshis
btc_to_spend = 0.5
satoshi_to_spend = btc_to_spend * 100000000
bitcoin_key_2_pub = "02989d0578f715a1980d4d6e968bcba487077e74aaf8a219d11ee4384ea1fc1eda"
bitcoin_key_2_priv = "*****cb521a27f9782cc503b461bf5c6b470469ca00ba1d7dc26f4ab61b*****"
bitcoin_key_2_addr = "n4SYP6TJyK7pUouW65fnC1hDBrbb7Za8RR"
# fetch the tx from whereever you like and parse it
response = get_response(prev_tx_1)
$prev_tx = Bitcoin::P::Tx.new(response.htb)
prev_tx = $prev_tx
tx_value = prev_tx.outputs[prev_out_index].value
puts "tx_value: #{tx_value}"
key = Bitcoin::Key.new(bitcoin_key_1_priv, bitcoin_key_1_pub)
tx = build_transaction(prev_tx, prev_out_index, key, satoshi_to_spend, bitcoin_key_2_addr, "hello")
puts ""
puts "--- bin_to_hex ---"
puts bin_to_hex(tx.to_payload)
Here’s the output:
➜ examples git:(master) ✗ ruby sandbox.rb
tx_value: 75972791
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:281: warning: constant ::Fixnum is deprecated
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:455: warning: constant ::Fixnum is deprecated
--- new tx ---
/Users/glaksmono/.rvm/gems/ruby-2.4.2/gems/bitcoin-ruby-0.0.18/lib/bitcoin/script.rb:261: warning: constant ::Fixnum is deprecated
{
"hash":"88217866a40829f144e2d2c19b2e506812ae013d08d9335ce8fa839582f1b18e",
"ver":1,
"vin_sz":1,
"vout_sz":1,
"lock_time":0,
"size":191,
"in":[
{
"prev_out":{
"hash":"427138ed5f2443fbfbf8065e990f1bf9ce0236e14376e8abca0b2876eabca653",
"n":1
},
"scriptSig":"304402201cf2d99b7f10c71a1c77ae629ec134a3f255c0027f47815aff3e43d500e6da46022008409ea148d6cce6876910c7a7218b8197c3a827a6a7bf3d5f064a3ed3a0616701 0367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7ca"
}
],
"out":[
{
"value":"0.50000000",
"scriptPubKey":"OP_DUP OP_HASH160 fb75447d6038b05bb736e5b05f18a3c9da2b34db OP_EQUALVERIFY OP_CHECKSIG"
}
]
}
--- bin_to_hex ---
010000000153a6bcea76280bcaabe87643e13602cef91b0f995e06f8fbfb43245fed387142010000006a47304402201cf2d99b7f10c71a1c77ae629ec134a3f255c0027f47815aff3e43d500e6da46022008409ea148d6cce6876910c7a7218b8197c3a827a6a7bf3d5f064a3ed3a0616701210367e6251a89c5afc1212c3e2169866ccfe9d6059a4cfc15dc139b534b974fd7caffffffff0180f0fa02000000001976a914fb75447d6038b05bb736e5b05f18a3c9da2b34db88ac00000000
It seems to be successful, but I don’t see the BTC actually transferred from bitcoin_key_1_addr to bitcoin_key_2_addr on the Blockcypher Explorer:
As you notice in the Blockcypher Explorer, the BTC amount is not yet transferred from bitcoin_key_1_addr to bitcoin_key_2_addr. Ideas?
