Attestation
A validator’s signed vote about the blockchain history it considers valid.
In more detail
On Ethereum, an attestation includes a view of the chain head and checkpoint votes used by consensus. It helps the network choose between valid branches and move toward finality. Validators need to vote correctly and on time, so these messages are an operational duty rather than a casual approval button.
How you might use it
Your validator sends an attestation for the chain it sees, and that vote contributes to fork choice and checkpoint finalization.
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