Mara is a tool designed to quickly replace or front-run unconfirmed transactions by broadcasting competing ones. For the attacker, it’s effective and “safe” to use. For the victim, it means a real risk of losing funds if their transaction gets replaced before confirmation

basically Mara is one of several tools designed to do the same thing: quickly replace or front-run unconfirmed Bitcoin transactions by broadcasting competing transactions with higher fees.

What makes Mara notable is it’s often optimized for speed and automation, especially in the context of puzzle key cracking and mempool monitoring.

But fundamentally, it uses Bitcoin’s standard Replace-By-Fee (RBF) or mempool replacement rules—just like any other mempool??