For WebTust Certification, a WebTust compliant SAS-70 WebTrust Root Signing [4] ceremony is required, unless you have SAS-70 personnel available
Links:[1] https://www.digi-sign.com/product/webtrust [2] https://www.digi-sign.com/winpop/roaming.php [3] https://www.digi-sign.com/winpop/key-ceremony.php [4] https://www.digi-sign.com/digi-ca/buyer/key+ceremony