Basically, cryptocurrencies are entries about token in decentralized consensus-databases. They are called CRYPTOcurrencies because the consensus-keeping process is secured by strong cryptography. Cryptocurrencies are built on cryptography. They are not secured by people or by trust, but by math. It is more probable that an asteroid falls on your house than that a bitcoin address is compromised.

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I strongly suggest only seriously entertaining the top say 100 coins by market cap. I personally rarely consider an investment in any coin that isn’t roughly in the top 10 – 20 (there are some rare exceptions, such as with ICOs, but I’m never putting the bulk of my investable funds in anything without proven staying power and community in almost every case).

The cryptocurrency market is insanely volatile. You can make a fortune in a moment and lose it in the next whether you trade Bitcoin, another coin, or the GBTC Bitcoin trust. Consider mitigating risks, hedging, and not “going long” with all your investable funds. TIP: If you trade only the top coins by market cap (that is coins like Bitcoin and Ethereum), or GBTC, then the chances of losing everything overnight are slim (not impossible, but slim). Other cryptocurrencies are riskier (but can offer quick gains on a good day).
Aus meiner Sicht besonders spannend sind die Kapitel zu den weiteren Anwendungsmöglichkeiten, die sich aus dem Blockchain-Konzept für ein "automatisiertes Vertrauen" ergeben. Die Konsequenz, darüber nachzudenken, wofür wir in Zukunft Vertrauensvolle (zentrale) Instanzen benötigen und wo und wie wir Vertrauen algorithmisch (dezentral) abbilden können, finde ich absolut faszinierend. Es geht also nicht nur bei Banken und in der Finanzwelt um die Fragen „zentral oder dezentral“, „Torwächter oder Macht“, sondern auch in vielen anderen Branchen. - Eine absolute Leseempfehlung!
Litecoin, launched in 2011, was among the initial cryptocurrencies following bitcoin and has often been referred to as “silver to bitcoin’s gold.” It was created by Charlie Lee, an MIT graduate and former Google engineer. Litecoin is based on an open source global payment network that is not controlled by any central authority and uses "scrypt" as a proof of work, which can be decoded with the help of CPUs of consumer grade. Although Litecoin is like bitcoin in many ways, it has a faster block generation rate and hence offers a faster transaction confirmation. Other than developers, there are a growing number of merchants who accept Litecoin. As of February 9, 2019, Litecoin had a market cap of $2.63 billion and a per token value of $43.41.
The biggest problem of the Blockchain is its reliance on miners. This is exactly why the cryptocurrency called IOTA (the Internet of Thigs Application) was created in 2016. IOTA also battles increasing transaction fees and network scalability. IOTA’s blockchain is called Tangle. It is a blockchain with no blocks and no chains. In this system, the users themselves are responsible for validating transactions. This means there’s no need for approval from miners; so users enjoy a fee-free transaction and an increased process speed.
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Ethereum: an open-source cryptocurrency launched in 2015 and proposed by Vitalik Buterin, Garvin Wood, and Joseph Lubin. It is based on the blockchain model whose main objective is the decentralization of the market. In 2016 there was a fork from which the Classic Ethereum emerged. Currently and since its inception, Ethereum ranks second in tems of the market capitalization.
A digital currency exchange can be a brick-and-mortar business or a strictly online business. As a brick-and-mortar business, it exchanges traditional payment methods and digital currencies. As an online business, it exchanges electronically transferred money and digital currencies.[1] Often, the digital currency exchanges operate outside the Western countries to avoid regulation and prosecution. However, they do handle Western fiat currencies and maintain bank accounts in several countries to facilitate deposits in various national currencies.[2][3] Exchanges may accept credit card payments, wire transfers or other forms of payment in exchange for digital currencies or cryptocurrencies. As of 2018, cryptocurrency and digital exchange regulations in many developed jurisdictions remains unclear as regulators are still considering how to deal with these types of businesses in existence but have not been tested for validity.

One of the key differences between 0x and other decentralized exchanges is that 0x is fast. To reduce blockchain bloat, all orders are transported off-blockchain and later verified. In addition to making transactions quick, this removes the necessity of spending gas to pay for network transaction costs, like on other decentralized exchanges such as EtherDelta.
There are also purely technical elements to consider. For example, technological advancement in cryptocurrencies such as bitcoin result in high up-front costs to miners in the form of specialized hardware and software.[87] Cryptocurrency transactions are normally irreversible after a number of blocks confirm the transaction. Additionally, cryptocurrency private keys can be permanently lost from local storage due to malware, data loss or the destruction of the physical media. This prevents the cryptocurrency from being spent, resulting in its effective removal from the markets.[88]
For takers, fees range from 0.10 to 0.25%. There are no fees for withdrawals beyond the transaction fee required by the network. One of the unique tools on the Poloniex platform is the chat box which is constantly filled with user help and just about everything. Any user can write almost anything but inappropriate comments are eventually deleted by moderators. It can sometimes be hard to distinguish the good advice from the bad, but the Chatbox is a great tool that will keep you engaged.
Gray Box Ive opened a few short positions in tether, eventually it will probably crash (which I think will precipitate the proper BTC bottom of this cycle) and until then its not going to past its $1 peg, So huge downside and no upside.  Very hard to predict when it will happen other than it will be caused by regulatory action so will probably happen on a weekday. I don't use it as a settlement anymore, its the main reason i only dabble in alts these days(most of my volume is on kraken trading against proper USD/EURO/YEN pairs.- If tether crashes, btc will crash and most exchanges will offer to refuge. Oh it will be fun to watch but horrific for those trapped.

The proof-of-stake is a method of securing a cryptocurrency network and achieving distributed consensus through requesting users to show ownership of a certain amount of currency. It is different from proof-of-work systems that run difficult hashing algorithms to validate electronic transactions. The scheme is largely dependent on the coin, and there's currently no standard form of it. Some cryptocurrencies use a combined proof-of-work/proof-of-stake scheme.[16]
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