Systems and methods for securely storing digital assets using a secure portal are disclosed. Using an isolated computer within an electronic isolation chamber, a plurality of digital asset accounts may be generated, and one or more private keys and a digital asset account identifier corresponding to each of the digital asset accounts may be obtained. A respective reference identifier may be associated with each digital asset account. At least one of the one or more private keys corresponding to each digital asset account may be divided into a plurality of private key segments and written to a card along with the respective reference identifier to create sets of collated cards, wherein each set comprises cards corresponding to different private keys.