A method and system for storing and retrieving electronic files using blockchains. Original electronic files including plaintext and encrypted files, are split into plural smaller files, encrypted, have a file index created and stored in a blockchain. The encrypted plural smaller files are sent to one or more email servers with standard emailing protocols (e.g., IMAP/POP/SMTP, etc.) and stored in one or more email inboxes. Email inboxes provide secure, private storage of electronic information. The encrypted plural smaller files are retrieved from the one or more e-mail servers using the file index stored on the blockchain, decrypted and reassembled back into the original electronic file.