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How Does the Transition of Ethereum to a Full PoS System Impact Its Finality?

Ethereum's transition to a full Proof-of-Stake (PoS) system, known as The Merge, introduced absolute, faster finality via the Casper FFG mechanism on the Beacon Chain. Unlike the previous probabilistic finality of PoW, a block confirmed by a 2/3 supermajority of staked Ether cannot be reverted without the attacker losing their stake (slashing).

This greatly enhances security, certainty, and reduces the risk of deep chain reorganizations.

What Is the ‘Finality’ Concept in Blockchain Consensus Mechanisms?
How Does pBFT Achieve Transaction Finality?
What Is the Concept of ‘Economic Finality’ in PoS and Why Is It Important?
What Is the Difference between “Soft Slashing” and “Hard Slashing”?