Build Your Own Blockchain in Less than 10 Lines of Ruby - blockchain.rb

ruby-talk
1

Hello,

   Thanks to Matias Fernandez for cutting out the fluff. The line
count is now at eight - less than 10 :-). Anyone can make it shorter?

  blockchain.rb [1]:

require 'digest'

class Block
   attr_reader :index, :timestamp, :data, :previous_hash, :hash

   def initialize(index:, timestamp: Time.now, data:, previous_hash:)
     @index , @timestamp, @data, @previous_hash = index, timestamp,
data, previous_hash
     @hash = Digest::SHA256.hexdigest(index.to_s + timestamp.to_s +
data.to_s + previous_hash.to_s)
  end
end

# Usage: Build Blockchain
b0 = Block.new(index: 0, data: 'Genesis', previous_hash: '0')
b1 = Block.new(index: b0.index + 1, data: 'First transaction',
previous_hash: b0.hash)
b2 = Block.new(index: b1.index + 1, data: 'Second transaction',
previous_hash: b1.hash)

# Print Blockchain
[b0, b1, b2].each { |block| p block }

     Happy blockchaining with Ruby. Cheers. Prost.

[1] https://github.com/MatiasFMolinari/blockchain-ruby/blob/master/blockchain.rb