~1 in every 20 blocks, difficulty drops to zero. The next miner to hash wins an instant block. No one can predict when. The blockchain decides.
Blocks where difficulty dropped to minimum. The miner who was hashing got an instant 1 CAP block.
Aggregated data from the Nipton Lottery Scanner
The true mechanics behind CapStash's lottery block system
Each block height has a ~1 in 20 chance of being a lottery block. The selection is determined by hashing the previous block hash, height, and a domain separator. It's pseudorandom — nobody can predict or manipulate it.
When a lottery block triggers, the mining difficulty drops to our absolute minimum (Difficulty 1, which is 0.5 relative to BTC's difficulty). This makes the block trivially easy to find — whoever is hashing at that exact moment will solve it almost instantly.
After v27.1.0, lottery blocks are permanently quarantined from the Dark Gravity Wave difficulty calculation. Their easy difficulty doesn't drag down the network. No consecutive lottery blocks are allowed in the final era.