import os

class SovereignShield:
    def __init__(self, protected_files):
        self.protected_files = protected_files

    def verify_integrity(self):
        """Perform a quick checksum of protected files."""
        for file in self.protected_files:
            if not os.path.exists(file):
                return False
        return True

    def block_unauthorized_access(self, process_id):
        # Implementation of kernel-level filtering logic
        pass