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Merkle trees. Bitcoin uses essentially the data structure in Haber and Stornetta's 1991 and 1997 papers, shown in simplified form in Figure 2 (Nakamoto was presumably unaware of Benaloh and de Mare's work). Of course, in bitcoin, transactions take the place of documents. In each block's Merkle tree, the leaf nodes are transactions, and each internal node essentially consists of two pointers. This data structure has two important properties. First, the hash of the latest block acts as a digest. A change to any of the transactions (leaf nodes) will necessitate changes propagating all the way to the root of the block, and the roots of all following blocks. Thus, if you know the latest hash, you can download the rest of the ledger from an untrusted source and verify that it has not changed. A similar argument establishes another important property of the data structure—that is, someone can efficiently prove to you that a particular transaction is included in the ledger. This user would have to send you only a small number of nodes in that transaction's block (this is the point of the Merkle tree), as well as a small amount of information for every following block. The ability to efficiently prove inclusion of transactions is highly desirable for performance and scalability.бесплатный bitcoin bitcoin nvidia виталик ethereum bitcoin strategy magic bitcoin In the 1980s, Dr David Chaum wrote extensively on topics such as anonymous digital cash and pseudonymous reputation systems, which he described in his paper 'Security without Identification: Transaction Systems to Make Big Brother Obsolete'.

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What Are Cryptocoins?
How cryptocurrency works, where to buy it, and which ones to consider
by Brad Stephenson
Updated on August 25, 2019
Digital room with padlock and word blockchain, 3d illustration
Westend61 / Getty Images

Cryptocurrency
What Are Bitcoins?
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Cryptocoins, also called cryptocurrency or crypto, is a form of digital currency powered by blockchain technology. Cryptocoins do not have a physical, real-world equivalent. No physical coins represent cryptocurrency value, although some replicas have been made for promotional purposes or as a visualization tool. Cryptocoins are purely digital.


Bitcoin is the most popular example of a cryptocurrency but there are many more such as Litecoin and Ethereum that are made to rival it or be used in competing markets.

How Many Crypto Currencies Are There?
Hundreds of cryptocurrencies have been created since the debut of Bitcoin in 2009. Some of these have spun-off of the Bitcoin blockchain such as Bitcoin Cash and Bitcoin Gold. Others use the same technology as Bitcoin such as Litecoin, and many more are based on Ethereum or use their own unique programming language.


Like traditional fiat currencies (currency not backed by a physical commodity), some cryptocurrencies are more valuable and practical than others and most have a very limited use case. Given that anyone can create a cryptocurrency, it's likely that most will remain niche while only a few popular cryptocoins will achieve mass adoption through mining or investments and go mainstream.

What's The Most Popular Cryptocoin?
The No. 1 cryptocurrency by ownership, price, and usability is undoubtedly Bitcoin. Bitcoin's popularity is mostly a result of it being the first cryptocoin on the market and its unmistakable brand identity. Everyone's heard of Bitcoin and very few people can name another cryptocurrency. Many online and offline stores accept Bitcoin and it's also accessible via the growing number of Bitcoin ATMs popping up in major cities around the globe.


Major rivals to Bitcoin include coins such as Litecoin, Ethereum, Monero, and Dash while smaller cryptocurrencies like Ripple and OmiseGo also have the potential for larger adoption in the future due to their backing by major financial institutions.

Bitcoin spin-off currencies such as Bitcoin Cash (BCash) and Bitcoin Gold can get a lot of buzz online and their prices can appear impressive but it's unclear if they will have any true lasting power due to the growing perception of these coins as cheap imitations of the main Bitcoin blockchain.

Despite using the Bitcoin name, these coins are very much separate currencies from the main one even though they use similar technology. New investors are often tricked into buying BCash, thinking it's the same as Bitcoin when it's not.



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