Its the best in that essence why because its offline and whatever is offline can't be hacked but so far how many persons has patronized cold storage,? Because definitely if we block chain investors cant get that statistical fact out,we wont want to trust it even when it's offline and secondly is there a transaction fee? Thirdly,if you want to trade bitcoin meaning you cant trade to an online storage as blockchain and paxful which i do use. And lastly,as for bitcoin fluctuation,it has a statistical record from 2015-2018 that as at this period it does face this kind if market Trauma but take a close look,bitcoin will bounce back in no time because nations has begin to accept crypto currencies as a legal tender and bitcoin,EThereum and ripple is sure a top priority. Thanks for sharing this information,i appreciate. 👌