“The nature of cryptocurrency makes it complicated to pass down. Cryptocurrency is usuallystored on the blockchain, a digital ledger that’s formed by a network of computers throughout the world that record transactions, including the exchange of cryptocurrency. People usually make these transactions by using public and private keys. Public keys work like bank account numbers, and serve as an address that you can use to send other people crypto. Private keys work like passwords, and are made of unique, extremely long strings of characters that unlock your crypto. Unlike other types of passwords, however, private crypto keys can’t be recovered once they’re lost or forgotten. That means that without those keys, people who are entitled to inherit their loved one’s crypto won’t be able to get it.”
https://www.vox.com/recode/22971265/bitcoin-wills-estate-planning-cryptocurrency-nfts-death