Blockchains are secure by design and are an example of a distributed computing system with high Byzantine fault tolerance. Decentralized consensus has therefore been achieved with a blockchain.[29] Blockchains solve the double-spending problem without the need of a trusted authority or central server, assuming no 51% attack (that has worked against several cryptocurrencies).
It is important investors realize not all exchanges and brokers that offer delivery of the underlying Bitcoin are created equal. Some firms have fallen victim to theft by hackers who have stolen Bitcoin belonging to clients whose money was held at the exchanges. Meanwhile, other Bitcoin exchanges have gone bankrupt (as in the case of Mt. Gox),  as a result of fraud or mismanagement.
Founded in 2014, Poloniex is one of the world’s leading cryptocurrency exchanges. The exchange offers a secure trading environment with more than 100 different Bitcoin cryptocurrency pairings and advanced tools and data analysis for advanced traders. As one of the most popular trading platforms with the highest trading volumes, users will always be able to close a trade position. Poloniex employs a volume-tiered, maker-taker fee schedule for all trades so fees are different depending on if you are the maker or the taker. For makers, fees range from 0 to 0.15%, depending on the amount traded.
In 2006, US-based digital currency exchange business GoldAge Inc., a New York state business, was shut down by the US Secret Service after operating since 2002.[8] Business operators Arthur Budovsky and Vladimir Kats were indicted "on charges of operating an illegal digital currency exchange and money transmittal business" from their apartments, transmitting more than $30 million to digital currency accounts.[5] Customers provided limited identity documentation, and could transfer funds to anyone worldwide, with fees sometimes exceeding $100,000.[5] Budovsky and Kats were sentenced in 2007 to five years in prison "for engaging in the business of transmitting money without a license, a felony violation of state banking law", ultimately receiving sentences of five years probation.[9]
Advice from 2015: As a rule of thumb, don’t acquire any volatile assets you can’t afford to lose. This is a valuable guideline for investments in general. It’s important to look at the history of the value of Bitcoin. In late 2013 and early 2014, Bitcoin gained considerable Media attention, and the price of all coins inflated wildly and unreasonably. Since then most coins have leveled out at about double their pre-2014 value, but there is still plenty of room for the price to go down. History has shown us that there is plenty of room to go up as well. $1,000 Bitcoins? It happened once; it could happen again.
Verification Requirements – The vast majority of the Bitcoin trading platforms both in the US and the UK require some sort of ID verification in order to make deposits & withdrawals. Some exchanges will allow you to remain anonymous. Although verification, which can take up to a few days, might seem like a pain, it protects the exchange against all kinds of scams and money laundering.
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Bücher über Bitcoin waren bisher schmal und meist verwirrend, Bücher von Technikfreaks für Technikfreaks. Das ist nicht sehr überraschend, weil diese Technologie bis vor etwa 1,5 Jahren auch fast ausschließlich von diesen Leuten dominiert wurde. Das ändert sich seitdem rasant und auch wenn Bitcoin als Währung und als Technologie noch nicht im Hauptstrom angekommen sind und niemand sicher sagen kann, ob sie sich durchsetzen werden, sie haben das Potential unsere Gesellschaft sehr stark und je nach Sichtweise sogar radikal zu verändern.
Casey und Vigna sind Wirtschaftsjournalisten, die regelmäßig für die Financial Times, die Washington Post, für das Wall Street Journal und CNN und BBC arbeiten. Mehr an klassischer Ökonomie geht fast nicht mehr: „Wir waren beiden Skeptiker, als wir von Bitcoin hörten. Geld, das nicht vom Staat garantiert wird? Verrückt!“ Aber sie sind neugierig und beiden steckt noch der Crash von 2008 in den (Schädel-)knochen. Sehr nachvollziehbar beschreiben sie die Phasen der Akzeptanz von Geringschätzung über Skepsis, Neugier bis hin zum Moment „wo der Groschen fällt“, wo sie „plötzlich eine Vorstellung von einer ganz neuen Art, Dinge zu tun“ haben bis hin zur Akzeptanz. Das Buch ist eine Entdeckungsreise in die Welt der Krytowährungen und der Technologie dahinter und sie versuchen, die vielen Puzzelteile zusammenzusetzen. Das ist ihnen nicht nur gelungen, sie haben es in einer Sprache geschrieben, die jeder verstehen kann. Aus meiner Sicht ist es derzeit das Standardwerk, einfach guter Journalismus.

Blockchains are secure by design and are an example of a distributed computing system with high Byzantine fault tolerance. Decentralized consensus has therefore been achieved with a blockchain.[29] Blockchains solve the double-spending problem without the need of a trusted authority or central server, assuming no 51% attack (that has worked against several cryptocurrencies).
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