To protect yourself, request that the buyers sign an irrevocable deposit release. Even though they are going with 100% financing, there should be some sort of deposit. This will allow Escrow to release the deposit to you should the buyers fail to perform. If you don’t do this, Escrow, as a neutral fiduciary, won’t release the funds to you in case of failure to perform unless stipulated via a judgment or negotiated settlement at arbitration. Then, to protect the buyers, you submit an addendum to the contract that credits the deposit back to the buyers at COE. I have done this several times in the case of 100% financing.