This is the Bitcoin wallet from the company with the most digital Bitcoin wallets and a great track record of security. Miner Premium. Ultimately, making cryptocurrency mining a profitable process. This is why we created this bitcoin app list. Fold allows users to pay at such stores as Target, Starbucks and Whole Foods using their Bitcoins, right from their mobile device. What is the Blockchain Anyone who has studied accountancy or owns a bank account knows what a ledger is. Now that you know what a ledger is, and how the banking system deals with transactions, let us get back to Blockchains.