Being notified for submission is not directly a built-in feature but yes, you could get an email notification once a submission lands in your user account using the rest services as outlined and discussed in our previous post:
The record validation feature does not support a digital signature but you could definitely create a survey field and your team validating the record could sign the record once the validation is complete.
Besides, you should also know who validated the record as it’s you who control the access of providing a record validation access to your team as outlined in the support article Managing Permissions.
