“top 5 cryptocurrency +asic bitcoin miner”

Bitcoin is the mainstream choice. If you’re looking for a cryptocurrency with first-mover advantage, unmatched popular visibility and the highest market capitalization, it’s a no-brainer. On the downside, it’s now nearly impossible to mine profitably, incredibly energy-intensive and, after rising more than 1,000 percent over the past year, could have expended most of its potential for growth. (This is debatable. No one knows anything.)
But first, a disclaimer: Bitcoin, Ethereum, and so many of the other cryptocurrencies out there can be a way to pay for stuff online, sure. And they can also be (if they aren’t already more popular as) investments. And investments, you might know, can go up and down. You can gain money on them, or lose it. And those values can fluctuate wildly, as you might’ve also seen lately. 
Regardless of your intent, the same logic applies. Keep the crypto that you won’t need for a while in a secure wallet, a vault, or cold storage. And keep a separate wallet with a portion of your overall funds—perhaps a mobile one—for those daily transactions.
Update: In late 2017 Kraken was temporarily unlisted here following extensive trading engine and UI issues. Thankfully, in January 2018 the website underwent a successful migration and all systems are now reported to be functioning to everyone’s satisfaction.
An added benefit of Zcash’s optional privacy is that it enables any Zcash token to be traded like any other Zcash token. So-called private transactions allow users to obscure the details of their payments and therefore help prevent anyone from discriminating between coins based on their history. This property, known as fungibility, is “necessary in order for [a currency] to become a liquid medium of exchange,” Beck says.
The author hedges, however, in blaring all caps, that “THE FUTURE ZEC PRICES SHOWN ARE PURELY HYPOTHETICAL AND SPECIFICALLY ASSUME THAT ZEC PRICES WILL INCREASE…NO REPRESENTATION IS MADE THAT ANY RESULTS WILL OR ARE LIKELY TO ACHIEVE PRICES SIMILAR TO THOSE SHOWN.”
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The issue with Virwox is that even though it supplies various payment methods many users have complained about their services. Some have even reported that their money was taken with no return. However most of the reviews tend to show that either the purchase of Bitcoins was successful or that the money was refunded.
Second, it is possible the charges are classified as cash advances in which cases different fees or policies may apply. So, be sure you are familiar with your credit card company and how they handle purchases of bitcoins.
If you wish to buy Bitcoin via bank transfer on Coinbase, it can take up to five days which is a bit annoying. Although, if you do buy using a connected bank account, Coinbase charges a much lower fee for purchases – it’s 3.99% for credit/debit card purchases and only 1.49% for bank transfer purchase.
The most bullish thing for any cryptocurrency is to be listed on an exchange. If a place like Coinbase, Bittrex or Kraken announces plans to list a coin that is still in its ICO phase, this is an excellent sign.
Formerly known as Bitx, Luno is a bitcoin exchange and wallet provider, they only offer bitcoin trading and ethereum trading. Launched in 2013, their reach is massive, currently serving traders in over 42 countries. It has a lot of similarities as Coinbase, however only sticking to bitcoin reduces its draw for traders however the fact that they cover so many countries is a selling point. For more analysis, read my in-depth review.
I use bitcoin.de which still isn’t mentioned here. For small transactions, the bid/ask spread is smaller than most other sites, and the fees are lower (0.5%). They accept SEPA transfers too (which are zero cost). For people living in Europe, this is probably the top choice, which makes me wonder why these reviews omit it. Admittedly, it probably isn’t the top choice for US residents unless they can use a European bank account, but there are plenty of buyers/sellers in Europe.
This is an important question to ask. Yes, putting the words trustworthy bitcoin exchange in the same sentence seems like an oxymoron, especially when remembering the shiny days of MtGox (aka Empty-Gox). While the bitcoin protocol has never been hacked, many peripheral businesses have. Perhaps the best question to ask would be: which are the least secure bitcoin exchanges. Generally, those listed here are optimum and of good standing, but please proceed with caution. Remember never to leave more btc online than you can afford to loose.
Platforms such as LocalBitcoins will help you to find individuals near you who are willing to exchange bitcoin for cash. Also, LibertyX lists retail outlets across the United States at which you can exchange cash for bitcoin. And WallofCoins, Paxful and BitQuick will direct you to a bank branch near you that will allow you to make a cash deposit and receive bitcoin a few hours later.
Operating out of San Francisco, USA since 2011 – this site is optimised for serious buyers wanting to actively trade BTC (Kraken uses the official “XBT” currency code). More and more Cryptocoin markets are up and running too (for example Ethereum & Zcash trading have been added recently).