Problem showing edit form based on edit link

So I’m successfully generating the edit link like so /edit-offer/?gform_post_id=126&nonce=549ba5aeaa

On the edit form page, I’m just fetching the post id via a GET request which is obviously terrible security-wise – see code below.

$edit_post_id = isset( $_GET['gform_post_id'] ) ? (int) $_GET['gform_post_id'] : 0;

if ( !empty( $edit_post_id ) ) {
echo do_shortcode('[gravityform id="4" title="false" description="false" update="'.$edit_post_id.'" ]');
}

How should I use the nonce that’s appended in the URL to make this more secure. I didn’t see anything in the docs about it. Thanks

https://wordpress.org/plugins/gravity-forms-post-updates/