Could a Cryptocurrency Futures Contract Be Used to Hedge the Risk of an Unsuccessful Attack?

Yes, a cryptocurrency futures contract could be used to hedge the risk of an unsuccessful attack, though indirectly. An attacker could use a long futures contract to hedge against the potential loss of capital used to acquire the hashrate if the attack fails and the coin price rises (or remains stable).

However, the primary use would be to hedge against the volatility of the coin's price during the attack window, ensuring the value of the double-spent coins remains predictable.