You can always list your digital assets on a piece of paper, in a note book or on your computer or in a document in the cloud but for extra safety and security you could choose to list your digital assets with a specialised storage service. Below is a list of a couple of digital asset registries you could try.
Entrustet is now part of SecureSafe
Entrustet is a free online service that allows you to securely list all of your digital assets (online accounts and files on your computer), and decide if you’d like them transferred to heirs or deleted when you pass away. Entrustet also offers standardized and custom solutions for websites to help them deal with user deaths and last wishes.
Legacy Locker is the safe and secure way to pass your online accounts to your friends and loved ones. It’s like a digital safety deposit box – you can put all your online accounts (emails, photos, social networks, everything online that requires a login) in it. For every account you store, you can assign a beneficiary, someone to whom you want to entrust your digital assets for the future. Currently running at $29.99 a year or 299.99 for a lifetime subscription.
LifeEnsured is a digital estate planning and posthumous email service. It allows you to define what you would like to have happen to your online accounts (i.e. passed on to a family member, deleted, changed). They also allow you to prepare email messages and files which should be sent to you loved ones after you pass away. A limited accounts is free.
My Webwill is a secure online service that allows you to make decisions about your Internet accounts after your death. My Webwill was created so that you can take control of your immaterial assets, even in the afterlife.