[](http://www.elegantobjects.org) [](https://www.0crat.com/p/C91QJT4CF) [](http://www.rultor.com/p/yegor256/Zold) [](https://www.jetbrains.com/ruby/) [](https://travis-ci.org/yegor256/zold) [](https://ci.appveyor.com/project/yegor256/zold) [](http://www.0pdd.com/p?name=yegor256/zold) [](http://badge.fury.io/rb/zold) [](https://codecov.io/github/yegor256/zold?branch=master) [](https://gemnasium.com/yegor256/zold) [](https://codeclimate.com/github/yegor256/zold/maintainability) **NOTICE**: It's an experiment and a very early draft! Please, feel free to submit your ideas and/or pull requests. Here is the [White Paper](https://github.com/yegor256/zold/raw/master/wp/wp.pdf). The license is [MIT](https://github.com/yegor256/zold/blob/master/LICENSE.txt). ## How to Use First, install [Ruby 2.3+](https://www.ruby-lang.org/en/documentation/installation/), [Rubygems](https://rubygems.org/pages/download), and the [gem](https://rubygems.org/gems/zold): ```bash $ sudo apt-get install ruby-dev rubygems zlib1g-dev libssl-dev $ gem install zold ``` To make sure it's installed, try: ```bash $ zold --help ``` You will need PGP private and public keys in `~/.ssh`. If you don't have them yet, run this in order to generate a new pair (just hit Enter when it asks you for a password): ```bash $ ssh-keygen -t rsa -b 4096 ``` Then, create a new wallet (instead of `5f96e731e48ae21f` there will be your personal wallet ID, use it everywhere below): ```bash $ zold create 5f96e731e48ae21f ``` Then, give this ID to your friend, who is going to pay you. When the payment is sent, ask him or her for the ID of the wallet the payment has been sent from and then fetch that wallet (let's say it is `5555444433332222`): ```bash $ zold fetch 5555444433332222 5.00 ZLD added to 5f96e731e48ae21f: To my friend! ``` Now, you have the money in your wallet! Next, you can pay your friend back: ```bash $ zold pay 5f96e731e48ae21f 5555444433332222 2.50 'Here is a refund' -2.50 ZLD added to 5f96e731e48ae21f: Here is a refund ``` Finally, you have to push your wallet to the network so that your friend knows about the payment: ```bash $ zold push 5f96e731e48ae21f ``` That's it. You also can contribute to Zold by running a node on your server. In order to do that just run (with your own wallet ID, of course, and your own public IP address instead of `4.4.4.4`): ```bash $ zold node --trace --verbose --invoice=5f96e731e48ae21f --host=4.4.4.4 ``` Then, open the page `4.4.4.4:4096` in your browser. If you see a simple JSON document, everything is fine. Next, hit Ctrl+c and run this line, in order to start the node and make sure it will be online even when you log off (replace `CMD` with the command you just executed before): ```bash $ nohup bash -c 'while CMD; do gem install zold; done' & ``` Grateful users of the system will pay "taxes" to your wallet for the maintenance of their wallets. ## How to Contribute It is a Ruby command line gem. First, install [Ruby 2.3+](https://www.ruby-lang.org/en/documentation/installation/), [Rubygems](https://rubygems.org/pages/download), and [Bundler](https://bundler.io/). Then: ```bash $ bundle update $ rake ``` The build has to be clean. If it's not, [submit an issue](https://github.com/yegor256/zold/issues). Then, make your changes, make sure the build is still clean, and [submit a pull request](https://www.yegor256.com/2014/04/15/github-guidelines.html). If some test fails and you need to run it individually, check the logging configuration inside `test__helper.rb` and make sure the `Verbose` log is assigned to `$log`. Then, run, for example: ```bash $ ruby test/commands/test_node.rb ``` If you need to run a single test method, do this: ```bash $ ruby test/test_wallet.rb -n test_adds_transaction ```