Effective.

Each code signing certificate has a timestamp. The role of the timestamp is: any digital certificate has a validity period and supports a validity period of 1-3 years. However, the life cycle of your software will generally be longer. In order to avoid the need to re-sign the software and re-release it after the signing certificate expires, you must use a free timestamping service. When you sign code, the hash value generated by the code is sent to a timestamp server for timestamp de-signing.