Altcoin bitcoin 中文

Most cryptocurrency tokens are fungible and interchangeable. There are also purely technical elements to consider. Symmetric-key algorithm Block cipher Stream cipher Public-key cryptography Cryptographic hash function Message authentication code Random numbers Steganography. The term altcoin has various similar definitions. Retrieved 15 September Archived from the original on 10 December Retrieved 17 January

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See also: List of alternative cryptocurrencies. Altcoins are cryptocurrencies other than Bitcoin. The majority of altcoins are forks of Bitcoin with small uninteresting changes. This page categorises different ways altcoins have modified Bitcoin. It was chosen because it is fast to verify and has been critically analyzed. The following mining algorithms are being used in different altcoins:.

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See also: List of alternative cryptocurrencies. Altcoins are cryptocurrencies other than Bitcoin. The majority of altcoins are forks of Bitcoin with small uninteresting changes. This page categorises different ways altcoins have modified Bitcoin. It was chosen because it is fast to verify and has been critically analyzed. The following mining algorithms are being used in different altcoins:. The problem with having an algorithm that is «easy to mine with» referring to the ability to CPU or GPU mine profitably is that mining should be hard in order to secure the network.

When a mining algorithm is difficult to make ASICs for, there is a higher barrier to entry. Many argue that the creators or the developers could simply change the mining algorithm when an ASIC is developed, but this defeats the purpose of decentralized consensus by causing centralization.

If these cryptocurrencies do have a healthy number of companies producing ASICs and have avoided centralization, they still are using algorithms that take longer to verify than SHA2.

Therefore, at best a cryptocurrencies with merely a hashing algorithm change are as good as an exact clone of Bitcoin and not better however since Bitcoin already exists, an exact clone of Bitcoin has no innovation or value.

If the hashing algorithm is slower, as most altcoin algorithms are, it is a disadvantage because it takes more processing time to validate a block and increases the number of organic re-orgs makes it easier to double spend. In Proof of Stakeinstead of sacrificing energy to mine a block, a user must prove they own a certain amount of the cryptocurrency to generate a block. The more stake you own, the more likely you are to generate a block.

In theory, this should prevent users from creating forks because it will devalue their stake and it should save a lot of energy. Proof of Stake sounds like a good idea, but ironically, there is the «Nothing at Stake» problem. Because mining Bitcoin is costly, it is not smart to waste your energy on a fork that won’t earn you any money, however with Proof of Stake, it is free to mine a fork. An example of a nothing at stake attack is an attacker buying lots of «old stake» from users inexpensively inexpensive to users who no longer have stake in the currency.

This can be made convenient by offering small payments to users for uploading their wallet. Eventually after accumulating enough «old stake», the user can begin creating blocks and destroying as many or more coin days than the network was at that time.

This block generation can be repeated until it catches up to and beats the current main-chain very cheaply. There are also «stake grinding» attacks which require a trivial amount of currency.

In a stake [2] grinding attack, the attacker has a small amount of stake and goes through the history of the blockchain and finds places where their stake wins a block. In order to consecutively win, they modify the next block header until some stake they own wins once.

This attack requires a bit of computation, but definately isn’t impractical. Because these attacks exists, including Peercoin [3] and Blackcoin [4] proof of stake cryptocurrencies have «master» public keys that control the blockchain. This class of cryptocurrency is either insecure or centralized, however proof of stake based on a PoW currency is useful in some systems because gaining stake is costly, but it isn’t workable for bootstrapping distributed consensus.

Bitcoin is a lot like HTTP. It is an application layer protocol and tools can be built on it like websites can be built on HTTP. There is a class of cryptocurrencies that promise features like casino websites and exchanges and anonymity protocols to be built on top of.

When creating a new website, one doesn’t make a new protocol unless it is necessary. When creating an app such as » DarkSend «, one doesn’t need to make a new protocol such as «Darkcoin».

Because Darkcoin is by far the most popular cryptocurrency of this class, the Darkcoin example will be covered in this section.

The Darkcoin devs created a tool called DarkSend. DarkSend is an implementation of coinjoin an anonymity feature originally implemented in Bitcoin [5] which utilizes the Darkcoin network to organize the coinjoins. If DarkSend becomes open source and is useful, it will be ported to Bitcoin with a few small modifications.

These changes won’t be a hardfork, they will likely involve the masternodes being paid by those they are coinjoining for rather than the block reward, which is already possible and implemented for Bitcoin. For this reason, DarkSend would work better if the masternodes were paid by those they were helping coinjoin, or altcoin bitcoin 中文 there wasn’t a masternode at all and everyone collaborated in a decentralized fashion. The better implementation not vulnerable to tragedy of the commons is compatible with Bitcoin, therefore, the Darksend protocol serves no purpose.

All of these cryptocurrencies have a large premine intended to be paid to members of that demographic. Ultimately, all of these coins have suffered or are suffering their fate of an immediate sell off after the » airdrop » term for distribution of coins to the target demographic begins.

Note: These cryptocurrencies aren’t government initiatives, but are independently created for that demographic. Jump to: navigationsearch. See also: List of alternative cryptocurrencies Altcoins are cryptocurrencies other than Bitcoin. Navigation menu Personal tools Create account Log in.

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However, unique non-fungible tokens also exist. List of historical currencies Barter. The Times of Israel. Decentralized consensus has therefore been achieved with a blockchain. The Swiss regulatory agency FINMA stated that it would take a «balanced approach» to ICO projects and would allow «legitimate innovators to navigate the regulatory landscape and so launch their projects in a way consistent with national laws protecting investors and the integrity of the financial. Retrieved 14 October Archived from the original bitconi 27 August Princeton: Princeton University Press. A «share» is awarded to members of alfcoin mining pool who present a valid partial proof-of-work. The journal encourages authors to digitally sign a file hash of submitted papers, which will then be timestamped into the bitcoin blockchain. While some countries have explicitly allowed their use and trade, [50] others have banned or restricted it. An enormous amount of energy goes into proof-of-work cryptocurrency mining, although cryptocurrency proponents claim it is important to compare it to altcoin bitcoin 中文 consumption of the traditional financial. View Available Cards. Bircoin were searching for a crypto processor for a while, and one of our team members said ‘use CoinPayments, they are the best’ and atcoin was right! Vault Protect your coins in the vault, requiring a time amount you specify before being able to spend 中. List of bitcoin companies List of bitcoin organizations List of people in blockchain technology. Economics of Networks Journal.