The solution of forging IOUs by fingerprints on blank paper: Fictitious IOUs are not protected by law. The other party writes down the content of the iou on the blank paper signed. There is no real debt relationship between the two parties, so the IOU has no legal effect. As a creditor, you need to submit evidence to prove the fact of arrears.

Legal basis:

Article 143 of the General Principles of the Civil Law of People's Republic of China (PRC) A civil juristic act that meets the following conditions is valid:

(1) The actor has corresponding capacity for civil conduct;

(2) the meaning is true;

(three) does not violate the mandatory provisions of laws and administrative regulations, and does not violate public order and good customs.