Electronic Promissory Notes. Welcome to ECSI's Electronic Promissory Note site.A lender does not need to prove a promissory note's chain of custody for all time in order to enforce the note and mortgage. You can complete the Master Promissory Note online. Terms. The Master Promissory Note can be used for up to 10 years of borrowing at Cleveland State. How long will it take? Most people complete each MPN in less than 30 minutes. By filing a traditional promissory note, one must sue and allow the debtor to contest the debt.