Prepare the crust: combine the crushed biscuits with the melted butter, then press into the bottom of a springform pan and refrigerate for 30 minutes.
Soak the gelatin sheets in cold water for 5 minutes, or until softened.
In a large bowl, combine the mascarpone cheese, cream cheese, sugar, and vanilla extract.
Heat the espresso coffee and stir in the rum or coffee liqueur.
Squeeze out the excess water from the gelatin sheets and dissolve them in the warm coffee mixture.
Whip the heavy cream until stiff peaks form, then gently fold it into the mascarpone mixture.
Pour in the gelatinous coffee mixture and stir until smooth.
Pour the cream over the biscuit base and spread evenly. Refrigerate for at least 4 hours, or until set.
Dust the top of the cake with an even layer of cocoa powder.
Slice and serve, and enjoy the creamy, coffee-flavored Tiramisu Cheesecake!
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