GreenAddress is an open source wallet that allows users to save, send and receive bitcoin. Its hardware wallet system makes it safe by cold storage of private keys. As it is only a portfolio for BTC, it may be similar to others, but it differs to other simple portfolios. Green addres is based on a “sophisticated purse”, due to the wide variety of accessories that it brings, which makes it the ideal purse for people who have experience handling bitcoins in which it can also be used by retail investors in BTC