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Finality in Blockchain Consensus


Kargai

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In our daily lives we all know when a credit card transaction is considered finalized : it's when the paiement is accepted by the vendor an he give us what we just bought. He trust the fact that if the swipe of your card go well, he'll receive the money in exchange.

But how is it working for cryptos transactions exactly ? First we need to know that some blockchains offer probabilistic finality (as Bitcoin who could be in trouble in case of a 51% attack), while others can guarantee absolute finality

This article is great to learn more about those and also about the CAP Theorem (which is about what type of finality is a better choice depending of the situation) and more importantly in how those type of finality can impact the Proof-of-Stake consensus.

Quote

Blocks being reverted can result in losses of millions or dollars or impact fundamental actions in decentralized applications. As such, understanding finality is crucial both in building robust blockchain platforms and in choosing platforms on which to develop applications.

Source: https://medium.com/mechanism-labs/finality-in-blockchain-consensus-d1f83c120a9a

A little technical but very interesting to know how things could work in the future since I believe more and more coins wil turn to a Proof-of-Stake mode.

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