Blockchain holds the promise to transform the finance industry and other aspects of the digital economy by bringing one of the most important and oldest concepts, the ledger, to the internet age. Ledgers constitute a permanent record of all the economic transactions an institution handles, whether it’s a bank managing deposits, loans and payments; a brokerage house keeping track of stocks and bonds; or a government office recording the ownership and sale of land and houses.

https://blogs.wsj.com/cio/2018/03/09/is-search-of-blockchains-killer-apps/