Difficulty Adjustment Manipulation

Difficulty adjustment manipulation is an exploit where an attacker forces a blockchain to lower its mining difficulty to make attacks cheaper. By rapidly mining and then withholding blocks, an attacker can trick the network's algorithm into believing that the hash rate has dropped significantly.

The protocol responds by reducing the difficulty, which then allows the attacker to mine blocks much faster than the rest of the network. This provides the attacker with a massive advantage, allowing them to rewrite the chain or confirm malicious transactions with minimal energy expenditure.

It is a sophisticated way to weaken the network's security without needing to physically own the majority of the hardware. This exploit highlights the critical importance of secure and robust difficulty adjustment formulas in Proof of Work systems.