Block.io is an easy-to-use wallet for safekeeping of BTC, DOGE, and LTC. The wallet has a smart and intuitive interface, which will be a good choice for beginners in this sector.
Block.io is an HD wallet powered by strong security measures including multi-signature, encryption and security audits. The website requires up to 5 signatures for every withdrawal: one of the service and the remaining of the user. With Distributed Trust (dTrust), every user can configure signature for their all addresses. The service is operating non-stop.