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description
A visualisation of the Genesis Event on Ethereum 2.0

The Genesis Event

Keywords

  • Deposit contract
  • Seconds_Per_Eth1_Block = 14 seconds
  • Eth1_Follow_Distance = 2048 blocks * 14 seconds
  • Min_Genesis_Time = 1606824000 (12:00:00 pm UTC | Tuesday, December 1, 2020)
  • Min_Genesis_Active_Validator_Count = 16,384
  • Genesis_Delay = 7 days
  • Ethereum 2.0 Beacon-chain

Genesis Event

Conditions

There are two conditions that have to get triggered to get the Ethereum 2.0 chain started!

  1. The threshold of 16,384 validators needs to be hit
  2. The ETH1 block (=Trigger block) which determines the genesis time for ETH2 cannot be earlier than min_genesis_time.

Trigger ETH1 block = min_genesis_time - genesis_delay

Scenario One

The required amount of deposits (Min_Genesis_Active_Validator_Count) to fulfil the first condition occurs very quickly once the deposit contract has been deployed and before min_genesis_time.

Once the threshold of 16,384 deposits is met, the network will try to accomplish the second condition by trying to find the trigger block by calculating min_genesis_time - genesis_delay.

The goal of the trigger block (min_genesis_time - genesis_delay) is that the chain can never start earlier than min_genesis_time. The second scenario will make this clearer.

Scenario Two

The required amount of deposits (Min_Genesis_Active_Validator_Count) to fulfil the first condition occurs after min_genesis_time.

In this case, the second condition is met first and the trigger block becomes whatever min_genesis_time was set.
The trigger block (second condition) is achieved right after the deposit contract receives 16,384 validator deposits.
Genesis time becomes Trigger-block-timestamp + genesis_delay.

Sources:
Ethereum 2.0 Spec
The Genesis of a Beacon Chain