The Beacon Chain Ethereum explainer you need to read first

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Proof-of-Stake: Slots , Blocks, and Epochs In the Ethereum PoS system, block production and validation goes through the following steps: The PoS

In PoS Ethereum, time is divided in slots, each slot 12 seconds in length Each slot, a proposer is chosen, who builds their block on top of Slots and Epochs The Beacon Chain provides the heartbeat to Ethereum's consensus Each slot is 12 seconds and an epoch is 32 slots: minutes

classic slot machine free _balance Though, this approach requires slots to be passed to EL block, perhaps slot numbers are suitable replacement ethv1beaconheaders RPC Method Retrieves block headers matching given query By default it will fetch current head slot blocks The API