Orange-chocolate Cheesecake

• 4 eggs
• 900 ml cream cheese softened
• 260 gr chocolate wafer crumbs see note
• 240 gr semisweet chocolate chips
• 150 gr sugar
• 120 ml sour cream
• 45 gr butter
• 30 ml orange liqueur
• 4 gr vanilla
• 1 gr cinnamon (ground)