Right-click to extract apk, open META-INF file, and get certificate. RSA file, and view the certificate information through the command keytool.exe. You can view the MD5, SHA 1 and SHA256 values of the signature and signature algorithm.

The command line is as follows:

//meta-INF // META-INF/CERTRSA certificate. RSA extracted it for you.

The file META-INF/CERT. Republic of South Africa (Republic of South Africa)

If the obtained signature information is consistent with your signature, it is successful.