Monero is the most prominent example of the cryptonite algorithm. This algorithm was invented to add the privacy features Bitcoin is missing. If you use Bitcoin, every transaction is documented in the blockchain and the trail of transactions can be followed. With the introduction of a concept called ring-signatures, the cryptonite algorithm was able to cut through that trail.
Below, we’ll examine some of the most important digital currencies other than bitcoin. First, though, a caveat: it is impossible for a list like this to be entirely comprehensive. One reason for this is the fact that there are more than 1,600 cryptocurrencies in existence as of this writing, and many of those tokens and coins enjoy immense popularity among a dedicated (if small, in some cases) community of backers and investors. Beyond that, the field of cryptocurrencies is always expanding, and the next great digital token may be released tomorrow, for all anyone in the crypto community knows. While bitcoin is widely seen as a pioneer in the world of cryptocurrencies, analysts adopt many approaches for evaluating tokens other than BTC. It’s common, for instance, for analysts to attribute a great deal of importance to the ranking of coins relative to one another in terms of market cap. We’ve factored this into our consideration, but there are other reasons why a digital token may be included in the list as well.
On 21 November 2017, the Tether cryptocurrency announced they were hacked, losing $31 million in USDT from their primary wallet.[71] The company has 'tagged' the stolen currency, hoping to 'lock' them in the hacker's wallet (making them unspendable). Tether indicates that it is building a new core for its primary wallet in response to the attack in order to prevent the stolen coins from being used.
Once you bought your cryptocurrency, you need a way to store it. All major exchanges offer wallet services. But, while it might seem convenient, it’s best if you store your assets in an offline wallet on your hard drive, or even invest in a hardware wallet. This is the most secure way of storing your coins and it gives you full control over your assets.
Darknet markets present challenges in regard to legality. Bitcoins and other forms of cryptocurrency used in dark markets are not clearly or legally classified in almost all parts of the world. In the U.S., bitcoins are labelled as "virtual assets". This type of ambiguous classification puts pressure on law enforcement agencies around the world to adapt to the shifting drug trade of dark markets.[76]
Bitsquare is a user-friendly peer to peer exchange that allows you to buy and sell bitcoins in exchange for fiat currencies or cryptocurrencies. Bitsquare markets itself as a truly decentralized and peer to peer exchange that is instantly accessible and requires no need for registration or reliance on a central authority. Bitsquare never holds user funds and no one except trading partners exchange personal data. The platform offers great security with multisig addresses, security deposits and purpose-built arbitrator system in case of trade disputes. If you want to remain anonymous and don’t trust anyone, Bitsquare is the perfect platform for you. Check out the Bitsquare FAQ
But while cryptocurrencies are more used for payment, its use as a means of speculation and a store of value dwarfs the payment aspects. Cryptocurrencies gave birth to an incredibly dynamic, fast-growing market for investors and speculators. Exchanges like Okcoin, poloniex or shapeshift enables the trade of hundreds of cryptocurrencies. Their daily trade volume exceeds that of major European stock exchanges.

The term altcoin has various similar definitions. Stephanie Yang of The Wall Street Journal defined altcoins as "alternative digital currencies,"[20] while Paul Vigna, also of The Wall Street Journal, described altcoins as alternative versions of bitcoin.[21] Aaron Hankins of the MarketWatch refers to any cryptocurrencies other than bitcoin as altcoins.[22]
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