Class: Cryptocol::Blockchain

Inherits:
Object
  • Object
show all
Defined in:
lib/cryptocol.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Blockchain

Returns a new instance of Blockchain.



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# File 'lib/cryptocol.rb', line 6

def initialize()
  @chain = []
  @current_transactions = []
  # creating the genesis block
  new_block(100, 1)
end

Class Method Details

.hash(block) ⇒ Object 



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# File 'lib/cryptocol.rb', line 58

def self.hash(block)
  block_string = block.to_json
  Digest::SHA256.hexdigest block_string
end

.valid_proof(last_proof, proof) ⇒ Object 



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# File 'lib/cryptocol.rb', line 63

def self.valid_proof(last_proof, proof)
  guess = "#{last_proof}#{proof}"
  guess_hash = Digest::SHA256.hexdigest guess
  
  guess_hash.to_s[-4..-1] == '0000'
end

Instance Method Details

#hash(block) ⇒ Object 



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# File 'lib/cryptocol.rb', line 54

def hash(block)
  Blockchain.hash(block)
end

#last_block ⇒ Object 



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# File 'lib/cryptocol.rb', line 50

def last_block
  @chain[-1]
end

#new_block(proof, previousHash) ⇒ Object 



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# File 'lib/cryptocol.rb', line 13

def new_block(proof, previousHash)
  block = {
    :index => @chain.count + 1, 
    :timestamp => Time.now.to_i, 
    :transactions => @current_transactions, 
    :proof => proof, 
    :previous_hash => previousHash ||= self.hash(@chain[-1])
  }
  
  # Reset the current transactions
  @transactions = []
  
  @chain.push(block)
  
  block
end

#new_transaction(sender, recipient, amount) ⇒ Object 



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# File 'lib/cryptocol.rb', line 39

def new_transaction(sender, recipient, amount)
  @current_transactions.push({
    :sender => sender,
    :recipient => recipient,
    :amount => amount
  })
  
  # return the index where the transaction will be added to
  @chain.index last_block
end

#proof_of_work(last_proof) ⇒ Object 



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# File 'lib/cryptocol.rb', line 30

def proof_of_work(last_proof)
  proof = 0
  while !Blockchain.valid_proof(last_proof, proof) do
    proof += 1
  end
  
  proof
end