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#!/usr/bin/env ruby
require 'digest/sha2' # This library gives us the SHA256 hash function
system("clear") # Clear the terminal screen before we start
# You could tidy up this script by putting these utility functions in their own utils.rb file and requiring them in by uncommenting the the line below
# require_relative 'utils'
class String
def hash256
binary = [self].pack("H*")
hash1 = Digest::SHA256.digest(binary)
hash2 = Digest::SHA256.hexdigest(hash1)
return hash2
end
def field(size)
bytes = size * 2
self.rjust(bytes, '0')
end
def reversebytes
self.scan(/../).reverse.join
end
def hex
self.to_i.to_s(16)
end
def dec
self.to_i(16)
end
end
# Settings
target = '0000000000006a93b30000000000000000000000000000000000000000000000'
# Block Header
version = '1'
prevblock = '0000000000000b60bc96a44724fd72daf9b92cf8ad00510b5224c6253ac40095'
merkleroot = '0e60651a9934e8f0decd1c5fde39309e48fca0cd1c84a21ddfde95033762d86c'
time = '1305200806' # 2011-05-12 12:46:46 +0100
bits = '1a6a93b3'
nonce = 0 # 2436437219
header = version.hex.field(4).reversebytes + prevblock.reversebytes + merkleroot.reversebytes + time.hex.field(4).reversebytes + bits.reversebytes
# Miner
def mine(header, nonce, target)
loop do
attempt = header + nonce.to_s.hex.field(4).reversebytes
blockhash = attempt.hash256.reversebytes
puts "#{nonce}: #{blockhash}"
if blockhash.dec < target.dec
puts "Block Hash is below the Target! This block has been mined!"
break
end
nonce += 1
# Uncomment the line below to slow down the hashing
#sleep(0.1)
end
end
# Simulator
puts 'Mining Simulator'
STDIN.gets
puts <<-TXS
1. Get Transactions
-------------------
transactions: 13
TXS
STDIN.gets
puts <<-HEADER
2. Block
--------
version: #{version}
prevblock: #{prevblock}
merkleroot: #{merkleroot}
time: #{time} (#{Time.at(time.to_i)})
bits: #{bits}
nonce: ________
HEADER
STDIN.gets
puts header + '________';
STDIN.gets
puts <<-TARGET
3. Target
---------
#{target}
TARGET
STDIN.gets
mine(header, nonce, target)