The signature of the bank alone can identify the authenticity of this will. When writing a will, the court may conduct handwriting identification according to the opinions of the dissidents. It is unfair for the court to find that the party who holds the will cannot prove the authenticity of the will and does not bear the burden of proof. In this case, you can apply to the court to go to the testator's original work unit to retrieve his personnel files, or apply for bank deposit and withdrawal vouchers. These materials retained by the third party will all contain the testator's handwriting and can be used as comparison samples. Self-writing will is a special form of will. The second paragraph of Article 17 of People's Republic of China (PRC) Inheritance Law stipulates: "A self-written will is written by the testator, signed and marked with the year, month and day." Article 134 of the Civil Code: A self-made will is written by the testator, signed and marked with the year, month and day.