What is the role of 'attestations' in Ethereum's Proof of Stake consensus?
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A
Validators vote on which block they believe is the head of the chain, and these votes are aggregated to achieve finality
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B
Attestations are special transactions that certify a user's identity on-chain
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C
Validators attest that they have sufficient ETH to cover potential slashing penalties
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D
Nodes certify that they have downloaded and verified the full blockchain history