Domain change and orphaned digital signatures

[Guest UrJac]

Due to a company merger we have to change our domain; all servers, no

exceptions. We have been using the Certificate Authority to create digital

signature-enabled authorizations on a huge number of change forms (PDFs) for

the past year. Our fear is that there will be no way to prove the

authenticity of these signatures after the domain change, as the CA will be

under the new domain, essencially a different CA.

Any creative ideas on how to prove the authentication after the domain

change will be very appreaciated.