One of the most important problems that any payment network has to solve is double-spending. It is a fraudulent technique of spending the same amount twice. The traditional solution was a trusted third party - a central server - that kept records of the balances and transactions. However, this method always entailed an authority basically in control of your funds and with all your personal details on hand.

Bitcoin Cash holds an important place in the history of altcoins because it is one of the earliest and most successful hard forks of the original bitcoin. In the cryptocurrency world, a fork takes place as the result of debates and arguments between developers and miners. Due to the decentralized nature of digital currencies, wholesale changes to the code underlying the token or coin at hand must be made due to general consensus; the mechanism for this process varies according to the particular cryptocurrency. When different factions can’t come to an agreement, sometimes the digital currency is split, with the original remaining true to its original code and the other copy beginning life as a new version of the prior coin, complete with changes to its code. Bitcoin cash began its life in August of 2017 as a result of one of these splits. The debate which led to the creation of BCH had to do with the issue of scalability; bitcoin has a strict limit on the size of blocks, 1 megabyte. BCH increases the block size from 1 MB to 8 MB, with the idea being that larger blocks will allow for faster transaction times.

An increase in cryptocurrency mining increased the demand of graphics cards (GPU) in 2017.[37] Popular favorites of cryptocurrency miners such as Nvidia's GTX 1060 and GTX 1070 graphics cards, as well as AMD's RX 570 and RX 580 GPUs, doubled or tripled in price – or were out of stock.[38] A GTX 1070 Ti which was released at a price of $450 sold for as much as $1100. Another popular card GTX 1060's 6 GB model was released at an MSRP of $250, sold for almost $500. RX 570 and RX 580 cards from AMD were out of stock for almost a year. Miners regularly buy up the entire stock of new GPU's as soon as they are available.[39]

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Bitcoin Cash and Bitcoin Forks: Bitcoin Cash is a spin-off of bitcoin, meant to have faster transactions, voted on and implemented by the Bitcoin community. Bitcoin Cash was probably the most successful Bitcoin fork in history, but there are always new forks popping up. Maybe Bitcoin Gold, Bitcoin Diamond, Bitcoin SV, or another will catch on.. although history says this is a rare occurrence. Keep your eye on the forks, but don’t expect them to be guaranteed the staying power of Bitcoin. Bitcoin forks are interesting altcoins, but it’s unlikely either will ever truly challenge Bitcoin for the top spot. The concept here is that Bitcoin is so relevant that it is important to keep an eye on its forks, especially the one that has really weathered the storm so far, Bitcoin Cash.

The first decentralized cryptocurrency, bitcoin, was created in 2009 by pseudonymous developer Satoshi Nakamoto. It used SHA-256, a cryptographic hash function, as its proof-of-work scheme.[14][15] In April 2011, Namecoin was created as an attempt at forming a decentralized DNS, which would make internet censorship very difficult. Soon after, in October 2011, Litecoin was released. It was the first successful cryptocurrency to use scrypt as its hash function instead of SHA-256. Another notable cryptocurrency, Peercoin was the first to use a proof-of-work/proof-of-stake hybrid.[16]