Function difficulty_threshold_and_time_are_valid

fn difficulty_threshold_and_time_are_valid(
    difficulty_threshold: CompactDifficulty,
    difficulty_adjustment: AdjustedDifficulty,
) -> Result<(), ValidateContextError>

Validate the time and difficulty_threshold from a candidate block’s header.

Uses the difficulty_adjustment context for the block to:

• check that the candidate block’s time is within the valid range, based on the network and candidate height, and
• check that the expected difficulty is equal to the block’s difficulty_threshold.

These checks are performed together, because the time field is used to calculate the expected difficulty adjustment.