What are commentKey and commentSurfaceKey in the response of innertube api?

Youtube API ResponseThis is a clip of response printed in dev console in a youtube video page.

{"commentViewModel": {"commentId": "UgyOF36mgUSQ5oZ2ZFNAAaABAg","commentKey": "EhpVZ3IPrjn2WdWVlLE1em8yWkZONEFlhQUJBZyAskAE%3D","commentSurfaceKey": "EhpVZ3IPrjn2WdWVlLE1em8yWkZONEFlhQUJBZyAskAE%3D","pinnedText": "Pinned by Honkai: Star Rail","renderContext": {"loggingDirectives": {...},"sharedKey": "EgAGKYgB","toolbarStateKey": "EhpVZ3IPrjn2WdWVlLE1em8yWkZONEFlhQUJBZyAskAE%3D","toolbarSurfaceKey": "EhpVZ3IPrjn2WdWVlLE1em8yWkZONEFlhQUJBZyAskAE%3D"        }    },"isModeratedElqComment": false,"loggingDirectives": {"trackingParams": "CM4EEEMJGGMDIIMIZp_kgda5hQM9ZPIBR0OwmM","visibility": {...},"enableDisplayLoggerExperiment": true    },"renderingPriority": "RENDERING_PRIORITY_PINNED_COMMENT","replies": {"commentRepliesRender": {}    },"trackingParams": "CM4EEEMJGGMDIIMIZp_kgda5hQM9ZPIBR0OwmM","renderingPriority": "RENDERING_PRIORITY_UNKNOWN","isModeratedElqComment": false}

I want to know if these keys are helpful when contructing new comments or some operations related to youtube? include toolbarStateKey and toolbarSurfaceKey.