A node of a network receives account access information (AAI) for an account that a user has with a system. The node causes a first record to be added to a distributed ledger that is used for managing access to the account, wherein the first record includes the AAI or an encrypted storage identifier that identifies a storage location for the AAI. The node determines a likelihood that the account is being accessed by the user based on the AAI and/or historical AAI for one or more accounts, that include the account, that are used to access the system. The node causes a second record that includes a value representing the likelihood to be added to the distributed ledger. The node causes one or more other nodes of the network to be alerted that the first record and the second record have been added to the distributed ledger.