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What Is a ‘Difficulty Bomb’ in the Context of Certain Cryptocurrency Roadmaps?

A difficulty bomb is a piece of code intentionally inserted into a Proof-of-Work blockchain's protocol that causes the mining difficulty to increase exponentially over time. This makes mining progressively harder and eventually impossible.

Its purpose is to force a planned transition from PoW to a PoS consensus mechanism, preventing the community from indefinitely delaying the upgrade.

How Does the Concept of a “Difficulty Bomb” in Some Blockchains Affect Mining Pool Strategy?
What Is a “Contentious Hard Fork” versus a “Planned Hard Fork”?
Compare Proof-of-Work (PoW) and Proof-of-Stake (PoS) Consensus Mechanisms
What Are the Main Advantages of a Hybrid PoW/PoS Model?