Module: Bitcoin::Dogecoin::Util

Defined in:
lib/bitcoin/dogecoin.rb

Overview

Dogecoin-specific Script methods for parsing and creating of dogecoin scripts, as well as methods to extract address, doge_hash, doge and value.

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object

rubocop:disable CyclomaticComplexity,PerceivedComplexity



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# File 'lib/bitcoin/dogecoin.rb', line 22

def self.included(base)
  base.constants.each { |c| const_set(c, base.const_get(c)) unless constants.include?(c) }
  base.class_eval do
    def block_creation_reward(block_height)
      reward_scaler = 2**(block_height / Bitcoin.network[:reward_halving].to_f).floor
      if block_height < Bitcoin.network[:difficulty_change_block]
        # Dogecoin early rewards were random, using part of the hash of the
        # previous block as the seed for the Mersenne Twister algorithm.
        # Given we don't have previous block hash available, and this value is
        # functionally a maximum (not exact value), I'm using the maximum the random
        # reward generator can produce and calling it good enough.
        Bitcoin.network[:reward_base] / reward_scaler * 2
      elsif block_height < 600_000
        Bitcoin.network[:reward_base] / reward_scaler
      else
        POST_600K_REWARD
      end
    end

    def block_new_target(prev_height, prev_block_time, prev_block_bits, last_retarget_time)
      new_difficulty_protocol = (prev_height + 1) >= Bitcoin.network[:difficulty_change_block]

      # target interval for block interval in seconds
      retarget_time = Bitcoin.network[:retarget_time]

      if new_difficulty_protocol
        # what is the ideal interval between the blocks
        retarget_time = Bitcoin.network[:retarget_time_new]
      end

      # actual time elapsed since last retarget
      actual_time = prev_block_time - last_retarget_time

      if new_difficulty_protocol
        # DigiShield implementation - thanks to RealSolid & WDC for this code
        # We round always towards zero to match the C++ version
        actual_time = if actual_time < retarget_time
                        retarget_time + ((actual_time - retarget_time) / 8.0).ceil
                      else
                        retarget_time + ((actual_time - retarget_time) / 8.0).floor
                      end
        # amplitude filter - thanks to daft27 for this code
        min = retarget_time - (retarget_time / 4)
        max = retarget_time + (retarget_time / 2)
      elsif prev_height + 1 > 10_000
        min = retarget_time / 4
        max = retarget_time * 4
      elsif prev_height + 1 > 5000
        min = retarget_time / 8
        max = retarget_time * 4
      else
        min = retarget_time / 16
        max = retarget_time * 4
      end

      actual_time = min if actual_time < min
      actual_time = max if actual_time > max

      # It could be a bit confusing: we are adjusting difficulty of the previous block,
      # while logically we should use difficulty of the previous 2016th block ("first")

      prev_target = decode_compact_bits(prev_block_bits).to_i(16)

      new_target = prev_target * actual_time / retarget_time
      if new_target < Bitcoin.decode_compact_bits(
        Bitcoin.network[:proof_of_work_limit]
      ).to_i(16)
        encode_compact_bits(new_target.to_s(16))
      else
        Bitcoin.network[:proof_of_work_limit]
      end
    end
  end
end