How to understand Vitalik’s thoughts on Ethereum transaction confirmation method?

Original author: Haotian

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Vitalik's chosen route: Epoch and slot: Providing faster transaction confirmation time for Ethereum

How to understand @VitalikButerin's thoughts on Ethereum transaction confirmation method? Because the transaction confirmation time of 5-20 seconds on the main network is close to the speed

of credit card consumption, it seems to be enough from the user's perception. But compared with the millisecond confirmation time of layer 2, the difference in transaction confirmation between the main network and layer 2 will have certain security risks. Therefore, optimizing the transaction confirmation time of the main network is more to cater to the consideration of the development strategy of layer 2?

1) Ethereum's current Gasper consensus mechanism adopts the core concepts of Slot (time slot) and Epoch (period). Each Slot lasts for 12 seconds, and a part of Validators will be selected to verify the current transaction status of the chain for voting. Every 32 Slots, or 6.4 minutes, will constitute a period, and basically all validators will complete the voting within a period. The finality of the transaction usually takes two periods, or 12.8 minutes, which means that a transaction will not be irreversible until 12.8 minutes after it is initiated.