What happens next?

How to get a certificate of authenticity
Find an autograph authentication company.
Autograph authentication companies can help you verify an autograph was legitimate. They use a combination of specialized autograph authentication equipment, as well as handwriting analysis and computer technology, to ascertain if an autograph is legitimate.

Options are: + Speak to someone at the autograph authentication company. Have them write you a letter or email. + If you obtained an autograph secondhand, this can be particularly helpful. If you intend to sell an autograph you obtained in person, this can also be helpful as potential buyers will know your autograph is real. + Specialty medical quality checks may be used as well, as their effectiveness is visible. Traditionally, autograph issuers use copyright-issued photographs or other brands of shields. + The company may also request a " floating marker " (which can be obtained by contacting the company in person) to confirm that someone made an autograph. The company may also order proof of authenticity from certain agencies before issuing the autograph.
If you obtained an autograph secondhand, this can be particularly helpful. If you intend to sell an autograph you obtained in person, this can also be helpful as potential buyers will know your autograph is real.