In principle, it does not constitute a crime, but if the other party submits false evidence in the proceedings, if the circumstances are serious, it may constitute litigation fraud, and criminal responsibility may be investigated for the crime of obstructing testimony according to law.

In addition, regarding the signature on the receipt: the signature of the receipt is subject to the creditor's signature, and the proxy signature is invalid in principle unless there is a chain of evidence to prove that the debtor has repaid the debt.

At the same time, the handwriting on the white note is recognizable, even if it is added on the original receipt.

For example, the debtor repays 5000 yuan and asks the creditor to write a receipt. The creditor wrote, "I have received the arrears of RMB 5,000 returned by XXX", and the debtor secretly added a 0, and then issued a receipt to indicate that RMB 50,000 was returned. This 0 is recognizable, which involves the recognition technology.

Therefore, if the person who forged the signature dies, the authenticity of the receipt can be determined by identifying the creditor's handwriting.

If the creditor dies, the heir to the right can also identify it by keeping the creditor's handwriting before his death.