Track the verified status of keys that have been backed up or shared

[DemiMarie]

Your use case

What would you like to do?

Be able to validate the authenticity of messages in new sessions.

Why would you like to do it?

Obvious security reasons.

How would you like to achieve it?

Key backups should include enough information to validate the authenticity of the keys being backed up, and key sharing should include enough information to verify that the keys being shared are authentic.

Have you considered any alternatives?

None.

Additional context

No response

[t3chguy]

Duplicate of #14323