Finality checkpoints for a given state

The /eth/v1/beacon/states/{state_id}/finality_checkpoints endpoint retrieves the finality checkpoints of a specified Beacon Chain state. These checkpoints are critical in understanding the finality status of various epochs in the Ethereum PoS mechanism.

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Parameters

• state_id — the state identifier for which finality checkpoint information is requested. Acceptable values for state_id include:
  • head — represents the current head of the chain from the node's perspective.
  • genesis — the genesis state of the Beacon Chain.
  • finalized — the most recent state that has been finalized and is unlikely to undergo any further changes.
  • justified — the most recent state that has been justified, which is a stage preceding finalization.
  • <slot> — a specific time slot in the Ethereum protocol.
  • <hex encoded stateRoot with 0x prefix> — the specific state root, encoded in hexadecimal.

Response

The response includes an object with the following properties:

• data — an object containing finality checkpoint information for the specified state:
  • previous_justified — an object representing the last justified checkpoint before the current epoch. It contains:
    • epoch — the epoch number of this justified checkpoint.
    • root — the block root of this justified checkpoint.
  • current_justified — an object representing the current justified checkpoint. It contains:
    • epoch — the epoch number of the current justified checkpoint.
    • root — the block root of the current justified checkpoint.
  • finalized — an object representing the current finalized checkpoint. It contains:
    • epoch — the epoch number of the finalized checkpoint.
    • root — the block root of the finalized checkpoint.