Wireless communication devices for voice, data or image transmission; Wireless communication device for transmitting digital currency using established network protocols for sending and receiving transmissions over a blockchain via wireless technology; Downloadable software for sending, receiving, and transmitting digital currency using established network protocols for sending and receiving transmissions over a blockchain via wireless technology; Downloadable software for managing digital currency payment and exchange transactions; Downloadable computer software for use as a cryptocurrency wallet; Cryptocurrency hardware wallets; Cryptocurrency hardware wallets for communicating with mobile-phone based applications and secure peripheral devices; Downloadable software for verifying and authenticating user identity; Downloadable software for enabling recovery of all accounts generated from a particular seed phrase of any hardware wallet on-chain; Downloadable software for generating and storing cryptographic keys used to create or modify blockchain accounts for receiving and spending cryptocurrency