What Is the Concept of “Economic Finality” in a Hybrid System?

Economic finality refers to the state where the cost for an attacker to reverse a transaction becomes prohibitively expensive, making a chain reorganization economically unviable. In a hybrid system, this is achieved by combining the high cost of a 51% PoW attack with the slashing mechanism of PoS.

The attacker would need to acquire both immense hashing power and a large amount of staked cryptocurrency, ensuring that the economic loss outweighs any potential gain.