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I can only download wallet via the google play store?
That's right. Now implemented mobile wallet for Android. In the first quarter there will be a mobile wallet for IOS. There is also a ready-made voting application for windows and mac
https://boscoin.io/congress-voting/, where you can create and activate a new wallet, but use it only for voting. To send boscoin need to use a WEB wallet, wallet.boscoin.io