Do you have a signature certificate?
Yes The pro-signer also has a certificate and a security code, and the signature photo on the salted fish without a certificate is fake. Pro-signing means that the author personally signs his name and directly signs his own name. Special signature is special signature. Besides signing the author's name, the author can also write some words. First, it is necessary to determine whether the author is willing to give it and whether it can be specially signed.