“The legal conception of ‘facilitation’ or ‘aiding/abetting’ can be very broad,” Shapiro wrote in a message to CoinDesk. “Validators who do not propose a block containing a sanctioned [transaction], but nevertheless sign an attestation for that block as part of the sequence of events leading to that block becoming finalized, might be guilty of facilitating or aiding/abetting the sanctioned [transaction], and thus might be violating sanctions laws (or other laws, as applicable).”
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