When I try to verify I signed my code correctly, SignTool reports the following error:
SignTool Error: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider.
This is because of the 'verify' command you may have run: signtool verify myfile.exe. If you run this command, signtool will use the Windows Driver Verification Policy. In order for your file to 'verify' properly you need to include the /pa switch, so that SignTool uses the Default Authentication Verification Policy.
signtool verify /pa myfile.exe
* Sign Tool (SignTool.exe) (MSDN.Microsoft.com)