1. Submit an application: You can submit an application for signature handwriting identification to the public security organ or the judicial authentication institution. Usually need to provide relevant evidence, such as transaction vouchers, bank statements, etc.

2. Appraisal arrangement: After the application is approved, the appraisal institution will arrange a professional appraiser to appraise the signature handwriting. The appraiser needs to compare and analyze the signature of the other party with the signature of the sample to determine whether the other party has spent money.

3. Issue appraisal report: After the appraisal is completed, the appraisal institution will issue an appraisal report detailing the appraisal process and results. The appraisal report can be submitted to the court as evidence.