Use root Hint if Failed Query From Public Forwardes

[Ramin Malekgahsemi via Unbound-users]

Hi Dear Friend I have Unbound But some Name servers Block My DNS server IPS 
Beacuse My IP For IRAN (Do not Back IP Address For webSite ) 
FOr this  situation Use For Public Forwardes For Get ip Address For web Site 
How solve this In unbound ?
Please Help me