StephanyCryptodemo

Basic implementation of a crypto currency. Cryptodemo will allow us to perform safe transactions keeping an immutable chain state. StephanyCryptodemo on Rubygems

Add this line to your application's Gemfile:

gem 'stephany_cryptodemo'

And then execute:

$ bundle

Or install it yourself as:

$ gem install stephany_cryptodemo

1] To run, please execute

./bin/console 

2] To create the blockchain:

sdaneri_blockchain = StephanyCryptodemo::Blockchain.new
 => #<StephanyCryptodemo::Blockchain:0x007f99ba1661c8 @chain=[{:index=>1, :timestamp=>1524452221, :transactions=>[], :proof=>100, :previous_hash=>1}], @current_transactions=[]>

3] To know which is the last Block

last_block = sdaneri_blockchain.last_block
=> {:index=>1, :timestamp=>1524452221, :transactions=>[], :proof=>100, :previous_hash=>1}

4] To get the proof of work of the last block

last_proof_of_work = last_block[:proof]
=> 100

5] To get the a new valid proof according to the intern algorithm:

proof = sdaneri_blockchain.proof_of_work(last_proof_of_work)
=> 33575 

6] To validate the proof of work is accomplishing the requirement

value_to_validate = "#{last_proof_of_work}#{proof}"
 => "10033575" 

Digest::SHA256.hexdigest(value_to_validate)
=> "593057e494bb665192d458acd99765fb31c072a0ab65d977c26c01c4f7c90000" 

7] As a reward for the mining effort of finding a valid proof of work, then we have to give the person a price of one crypto coin:

sdaneri_blockchain.new_transaction('StephanyCryptodemo', 'Stephany', 1)
=> 0 

8] We need to attach the most recent transaction to the blockchain

block_2 = sdaneri_blockchain.new_block(proof)
 => {:index=>2, :timestamp=>1524454721, :transactions=>[{:sender=>"StephanyCryptodemo", :recipient=>"Stephany", :amount=>1}], :proof=>33575, :previous_hash=>"37ad9bd6fca3c047de47f27b540cd14c280a7fc015e06df20af15a3f48850f76"} 

Is also possible to add the last proof of work:

block_2 = sdaneri_blockchain.new_block(proof, sdaneri_blockchain.hash(last_block))
 => {:index=>2, :timestamp=>1524454721, :transactions=>[{:sender=>"StephanyCryptodemo", :recipient=>"Stephany", :amount=>1}], :proof=>33575, :previous_hash=>"37ad9bd6fca3c047de47f27b540cd14c280a7fc015e06df20af15a3f48850f76"} 

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Bug reports and pull requests are welcome on GitHub at https://github.com/sdanerib/stephany_cryptodemo. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.

Everyone interacting in the StephanyCryptodemo project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.