A Satisfaction of Security Instrument is a document that shows an individual has paid a deed of trust or a mortgage in full. A 10 day payoff is crucial to getting your old loans paid off during a refinance.Learn how it works from start to finish. Creating a payoff letter is essential to any loan or mortgage repayment process. Our free templates and this guide can help you get started. Edit, sign, and share lien payoff letter template online. No need to install software, just go to DocHub, and sign up instantly and for free.