This feature is only available to paid account holders. When a paid account holder claims a “full” TrustedForm Certificate they will receive a “Masked” Certificate URL as one of the data elements in the response. Masked Certificates have their own unique Certificate ID that is separate and distinct from the original “full” Certificate ID. Simply pass the Masked Certificate to your lead buyer instead of the full certificate.
For a full overview of the concept of 'Masked Certificates' click here.