I have a PDF document intended for long-term (many years, maybe decades) archival which I would like to digitally sign with my personal certificate to ensure its integrity.
As far as I understand, I need to timestamp the signature in order to ensure it remains valid even after certificate expiration.
Let's say I use a trustworthy TSA. From what I understand they sign the timestamp with their own signature.
Now, let's suppose the original TSA goes bankrupt or is compromised and its certificates revoked. Will my document remain readable without warnings?