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This is a ruby library for interacting with the bitcoin protocol/network.
Some of the main features are:
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Bitcoin::Key provides a high-level API for creating and handling keys/addresses
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Bitcoin::Util provides the basic bitcoin utility functions for base58, ECC, etc.
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Bitcoin::Protocol can parse/create all protocol messages
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Bitcoin::Script implementation, create/run scripts and verify signatures
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Bitcoin::Builder provides a high-level API for creating transactions (and blocks)
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Bitcoin::Litecoin implements all the litecoin-specific differences
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ruby 1.9.3
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ruby 2.0.0
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ruby 2.1.2
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ruby 2.2.0
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ruby 2.2.2
gem install bitcoin-ruby # OR git clone https://github.com/lian/bitcoin-ruby.git; cd bitcoin-ruby; bundle install
Note that some aspects of the library (such as networking, storage, etc.) need additional dependencies which are not specified in the gemspec. The core requirements are intentionally kept to a minimum, so nobody has to install unneeded dependencies.
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bacon
to run the specs -
scrypt
to use a much faster scrypt hash implementation for Litecoin
If you would like to install using Bundler, put it in your Gemfile and run bundle install
gem 'bitcoin-ruby', git: 'https://github.com/lian/bitcoin-ruby', branch: 'master', require: 'bitcoin'
There are different aspects to the library which can be used separately or in combination. Here are some ideas of what you could do. There are also some demo scripts in examples/, see EXAMPLES.
Generate a Bitcoin::Key
key = Bitcoin::Key.generate key.priv key.pub key.addr sig = key.sign("data") key.verify("data", sig) recovered_key = Bitcoin::Key.from_base58(key.to_base58)
Parse a Bitcoin::Protocol::Block
raw_block = File.open('spec/bitcoin/fixtures/rawblock-0.bin', 'rb') {|f| f.read} blk = Bitcoin::Protocol::Block.new(raw_block) blk.hash #=> 00000000839a8e6886ab5951d76f411475428afc90947ee320161bbf18eb6048 blk.tx.count #=> 1 blk.to_hash #=> ... Bitcoin::Protocol::Block.from_json( blk.to_json )
Parse a Bitcoin::Protocol::Tx
raw_tx = File.open('spec/bitcoin/fixtures/rawtx-01.bin', 'rb') {|f| f.read} tx = Bitcoin::Protocol::Tx.new(raw_tx) tx.hash #=> 6e9dd16625b62cfcd4bf02edb89ca1f5a8c30c4b1601507090fb28e59f2d02b4 tx.in.size #=> 1 tx.out.size #=> 2 tx.to_hash #=> ... Bitcoin::Protocol::Tx.from_json( tx.to_json ) Bitcoin::Script.new(tx.out[0].pk_script).to_string #=> "OP_DUP OP_HASH160 b2e21c1db922e3bdc529de7b38b4c401399e9afd OP_EQUALVERIFY OP_CHECKSIG"
Get the matching transactions (in this example tx1 is the spending transaction)
rawtx1 = File.open("spec/bitcoin/fixtures/rawtx-f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16.bin", 'rb') {|f| f.read} rawtx2 = File.open("spec/bitcoin/fixtures/rawtx-0437cd7f8525ceed2324359c2d0ba26006d92d856a9c20fa0241106ee5a597c9.bin", 'rb') {|f| f.read} tx1 = Bitcoin::Protocol::Tx.new(rawtx1) tx2 = Bitcoin::Protocol::Tx.new(rawtx2)
Then simply ask the transaction to verify an input
tx1.verify_input_signature(0, tx2) #=> true
If you want to control the Bitcoin::Script yourself, you can do so
txin = tx1.in.first txout = tx2.out[txin.prev_out_index] script = Bitcoin::Script.new(txin.script_sig + txout.pk_script) result = script.run do |pubkey, sig, hash_type| hash = tx1.signature_hash_for_input(0, nil, txout.pk_script) Bitcoin.verify_signature(hash, sig, pubkey.unpack("H*")[0]) end result #=> true
You need to know the previous output you want to spend (tx hash and output index), as well as the private key for the address required to sign for it.
# use testnet so you don't accidentally blow your whole money! Bitcoin.network = :testnet3 # make the DSL methods available in your scope include Bitcoin::Builder # the previous transaction that has an output to your address prev_hash = "6c44b284c20fa22bd69c57a9dbff91fb71deddc8c54fb2f5aa41fc78c96c1ad1" # the number of the output you want to use prev_out_index = 0 # fetch the tx from whereever you like and parse it prev_tx = Bitcoin::P::Tx.from_json(open("http://test.webbtc.com/tx/#{prev_hash}.json")) # the key needed to sign an input that spends the previous output key = Bitcoin::Key.from_base58("92ZRu28m2GHSKaaF2W7RswJ2iJYpTzVhBaN6ZLs7TENCs4b7ML8") # create a new transaction (and sign the inputs) new_tx = build_tx do |t| # add the input you picked out earlier t.input do |i| i.prev_out prev_tx i.prev_out_index prev_out_index i.signature_key key end # add an output that sends some bitcoins to another address t.output do |o| o.value 50000000 # 0.5 BTC in satoshis o.script {|s| s.recipient "mugwYJ1sKyr8EDDgXtoh8sdDQuNWKYNf88" } end # add another output spending the remaining amount back to yourself # if you want to pay a tx fee, reduce the value of this output accordingly # if you want to keep your financial history private, use a different address t.output do |o| o.value 49000000 # 0.49 BTC, leave 0.01 BTC as fee o.script {|s| s.recipient key.addr } end end # examine your transaction. you can relay it through http://test.webbtc.com/relay_tx # that will also give you a hint on the error if something goes wrong puts new_tx.to_json
Always trying to improve, any help appreciated! If anything is unclear to you, let us know!
Documentation is generated using yardoc:
rake doc
The specs are also a good place to see how something works.
The specs can be run with
rake bacon
or, if you want to run a single spec
ruby spec/bitcoin/bitcoin_spec.rb
If you make changes to the code or add functionality, please also add specs.
Any help or feedback is greatly appreciated! From getting knee-deep into elliptic-curve acrobatics, to cleaning up high-level naming conventions, there is something for everyone to do. Even if you are completely lost, just pointing out what is unclear helps a lot!
If you are curious or like to participate in development, drop by #bitcoin-ruby on irc.freenode.net!
Available here: [COPYING]