Date: 12 Adar I 5586
From: Rabbi Moshe Sofer
To: Rabbi Yehudi
The responsum addresses the halachic status of selling promissory notes at a discount where the seller retains full liability for the debt, concluding that this constitutes prohibited usury (ribbit ketzutzah) rather than a legitimate sale.
Source: Shu"t Chasam Sofer Collected §26