Module zebra_state::service::check::difficulty

Block difficulty adjustment calculations for contextual validation.

This module supports the following consensus rule calculations:

• ThresholdBits from the Zcash Specification,
• the Testnet minimum difficulty adjustment from ZIPs 205 and 208, and
• median-time-past.

Structs

• AdjustedDifficulty 🔒
  Contains the context needed to calculate the adjusted difficulty for a block.

Constants

• BLOCK_MAX_TIME_SINCE_MEDIAN
  The maximum number of seconds between the median-time-past of a block, and the block’s time field.
• POW_ADJUSTMENT_BLOCK_SPAN
  The overall block span used for adjusting Zcash block difficulty.
• POW_DAMPING_FACTOR
  The damping factor for median timespan variance.
• POW_MAX_ADJUST_DOWN_PERCENT
  The maximum downward adjustment percentage for median timespan variance.
• POW_MAX_ADJUST_UP_PERCENT
  The maximum upward adjustment percentage for median timespan variance.
• POW_MEDIAN_BLOCK_SPAN
  The median block span for time median calculations.