What Is the Concept of "Finality" in a Blockchain and How Does PoW Achieve It? ▴ Learn

What Is the Concept of “Finality” in a Blockchain and How Does PoW Achieve It?

Finality refers to the guarantee that once a transaction is confirmed and added to the blockchain, it cannot be reversed or altered. In a PoW system like Bitcoin, finality is probabilistic.

As more blocks are added on top of a transaction's block, the cost of reorganizing the chain to reverse that transaction becomes exponentially higher, making it practically irreversible after a certain number of confirmations (e.g. six blocks).

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