有很多人不知道时间戳服务器，我这里放几个：
Digicert: http://timestamp.digicert.com
Symantec: http://sha256timestamp.ws.symantec.com/sha256/
Comodo: http://timestamp.comodoca.com
Starfield: http://tsa.starfieldtech.com
GlobalSign: http://timestamp.globalsign.com/scripts/timestamp.dll
Certum: http://time.certum.pl
有很多人不知道时间戳服务器，我这里放几个：
Digicert: http://timestamp.digicert.com
Symantec: http://sha256timestamp.ws.symantec.com/sha256/
Comodo: http://timestamp.comodoca.com
Starfield: http://tsa.starfieldtech.com
GlobalSign: http://timestamp.globalsign.com/scripts/timestamp.dll
Certum: http://time.certum.pl