Module 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.