Mining Reward Variance

Mining reward variance is the statistical uncertainty in the revenue generated by a miner over a specific period, driven by the stochastic nature of block discovery. Because finding a block is a probabilistic event, a miner might find several blocks in a short time or go long periods without any success.

This variance is compounded by the orphaned block probability, which can strip a miner of their expected rewards even after they have successfully performed the work. For institutional mining operations, this volatility in cash flow creates financial risk that is often managed through mining pools, which distribute rewards more evenly among participants.

Understanding this variance is crucial for modeling the economic sustainability of proof-of-work consensus mechanisms.