Blend peaches, hot water, brown sugar, and cinnamon in a blender or food processor until smooth. Transfer to a pitcher; stir in dry white wine and triple sec. Cover and chill in refrigerator for at least 4 hours.
Strain peach mixture through a large cheesecloth-lined sieve; squeeze cloth to remove all the juices. Pour juice into a large pitcher; stir in sparkling white wine.
Save the strained peach pulp for another use, such as quick breads.
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