Rollblock (RBLK) has recently joined the ranks of Ethereum and Ripple as one of the top altcoins to invest in for the month of June. With a current trading price of $0.014, up from its initial price of $0.010, Rollblock is gaining momentum after reaching the third phase of its cryptocurrency Initial Coin Offering (ICO). The project has already raised an impressive $670k during its presale, indicating strong support and interest from the community.