Mutual distributed ledgers (MDLs) have the potential to transform the way people and organizations handle identity, transaction and debt information. MDL technology provides an electronic public transaction record of integrity without central ownership. The ability to have a globally available, verifiable and untamperable source of data provides anyone wishing to provide trusted third party services, i.e., most financial services firms, the ability to do so cheaply and robustly. Blockchain technology is a form of MDL.