Slot

What is Slot?

A slot is the fundamental time unit in Proof of Stake consensus a fixed 12-second window during which one assigned validator proposes a block. Slots ensure predictable block timing and equal participation across the validator set.

How does Slot work?

1. The network divides time into 12-second slots.
2. One validator is randomly assigned as proposer for each slot.
3. The proposer creates a block; other validators attest to its validity.
4. If the proposer misses their slot, it remains empty and the next slot begins.

Why does Slot matter?

Predictable slot timing enables light clients to sync efficiently and ensures no validator monopolizes block production.

Key features of Slot

• Fixed 12-second duration on Ethereum
• One proposer per slot, selected randomly
• Empty slots are possible if the proposer is offline
• 32 slots form one epoch

Examples of Slot

Slot 1000: Alice proposes a block. Slot 1001: Bob proposes and attests.

Slot 1002: Charlie goes offline slot is empty. The chain continues at slot 1003.