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What Is a “Difficulty Bomb” and Which Cryptocurrency Uses It?

A difficulty bomb is a mechanism intentionally coded into a blockchain's protocol that causes the mining difficulty to increase exponentially over time. This makes mining eventually impossible.

Ethereum (ETH) used a difficulty bomb to force a transition from Proof-of-Work (PoW) to Proof-of-Stake (PoS), ensuring the network upgrade (The Merge) would occur.

How Does a Change in the PoW Algorithm (E.g. Ethereum’s Move to PoS) Affect Attack Vectors?
What Is the Difference between PoW and Proof-of-Stake (PoS)?
Compare Proof-of-Work (PoW) and Proof-of-Stake (PoS) Consensus Mechanisms
How Do Options Traders Use Volatility Derived from PoW/PoS Transition Events?