Algoritmo bitcoin cash

At this moment, there are over AltCoin implementations, which use similar principles and various cryptocurrency algorithms. So, what do you need to create something like Bitcoin? What you need is a peer-to-peer P2P network. Information sharing in P2P networks is similar to information sharing among friends and family.

If you share information with at least one member of the network, eventually this information will reach every other member of the network. The only difference is that in digital networks this information will not be altered in any way. You have probably heard of BitTorrent, one of the most popular P2P file sharing content delivery systems. Another popular application for P2P sharing is Skype, as well as other chat systems.

Hashing Algorithm To understand digital identities, we need to understand how cryptographic hashing works. Hashing is the process of mapping digital data of any arbitrary size to data of a fixed size. In simpler words, hashing is a process of taking some information that is readable and making something that makes no sense at all.

You can compare hashing to getting answers from politicians. Information you provide to them is clear and understandable, while the output they provide looks like random stream of words. There are a few requirements that a good hashing algorithm needs: Output length of hashing algorithm must be fixed a good value is bytes Even the smallest change in input data must produce significant difference in output Same input will always produce same output There must be no way to reverse the output value to calculate the input Calculating the HASH value should not be compute intensive and should be fast If you take a look at the simple statistics, we will have a limited but huge number of possible HASH values, simply because our HASH length is limited.

If you think Hamlet is just a name or a word, please stop reading now, or read about the Infinite Monkey Theorem. Digital Signature When signing a paper, all you need to do is append your signature to the text of a document. A digital signature is similar: you just need to append your personal data to the document you are signing.

If you understand that the hashing algorithm adheres to the rule where even the smallest change in input data must produce significant difference in output, then it is obvious that the HASH value created for the original document will be different from the HASH value created for the document with the appended signature. A combination of the original document and the HASH value produced for the document with your personal data appended is a digitally signed document.

And this is how we get to your virtual identity, which is defined as the data you appended to the document before you created that HASH value. Next, you need to make sure that your signature cannot be copied, and no one can execute any transaction on your behalf. The best way to make sure that your signature is secured, is to keep it yourself, and provide a different method for someone else to validate the signed document.

Again, we can fall back on technology and algorithms that are readily available. What we need to use is public-key cryptography also known as asymmetric cryptography. To make this work, you need to create a private key and a public key. These two keys will be in some kind of mathematical correlation and will depend on each other. The algorithm that you will use to make these keys will assure that each private key will have a different public key.

As their names suggest, a private key is information that you will keep just for yourself, while a public key is information that you will share. If you use your private key your identity and original document as input values for the signing algorithm to create a HASH value, assuming you kept your key secret, you can be sure that no one else can produce the same HASH value for that document.

If anyone needs to validate your signature, he or she will use the original document, the HASH value you produced, and your public key as inputs for the signature verifying algorithm to verify that these values match. Since we do not have a central authority that will validate how much money you have, the system will have to ask you about it every time, and then check if you lied or not. So, your transaction record might contain the following information: I have Topcoins I want to send 10 coins to my pharmacist for the medication you would include your pharmacists public key here I want to give one coin as transaction fee to the system we will come back to this later I want to keep the remaining 89 coins The only thing left to do is digitally sign the transaction record with your private key and transmit the transaction record to your peers in the network.

Your job is done. However, your medication will not be paid for until the whole network agrees that you really did have coins, and therefore could execute this transaction. Only after your transaction is validated will your pharmacist get the funds and send you the medication. Cryptocurrency Miners: A New Breed of Agent Miners are known to be very hard working people who are, in my opinion, heavily underpaid.

In the digital world of cryptocurrency, miners play a very similar role, except in this case, they do the computationally-intensive work instead of digging piles of dirt. Unlike real miners, some cryptocurrency miners earned a small fortune over the past five years, but many others lost a fortune on this risky endeavour. Miners are the core component of the system and their main purpose is to confirm the validity of each and every transaction requested by users.

A website can demand a PoW token in exchange for service. Requiring a PoW token from users would inhibit frivolous or excessive use of the service, sparing the service's underlying resources, such as bandwidth to the Internet , computation, disk space, electricity, and administrative overhead. Finney's RPoW system differed from a PoW system in permitting the random exchange of tokens without repeating the work required to generate them.

After someone had "spent" a PoW token at a website, the website's operator could exchange that "spent" PoW token for a new, unspent RPoW token, which could then be spent at some third-party website similarly equipped to accept RPoW tokens. This would save the resources otherwise needed to 'mint' a PoW token. The anti-counterfeit property of the RPoW token was guaranteed by remote attestation.

Since the source code for Finney's RPoW software was published under a BSD -like license , any sufficiently knowledgeable programmer could, by inspecting the code, verify that the software and, by extension, the RPoW server never issued a new token except in exchange for a spent token of equal value.

Until , Finney's system was the only RPoW system to have been implemented; it never saw economically significant use. RPoW is protected by private keys. Rather than miners consuming energy in solving complex, but essentially useless, puzzles to validate transactions, Ofelimos achieves consensus while simultaneously providing a decentralized optimization problem solver. The paper gives an example that implements a variant of WalkSAT , a local search algorithm to solve Boolean problems.

But in Bitcoin, double-spend protection is provided by a decentralized P2P protocol for tracking transfers of coins, rather than the hardware trusted computing function used by RPoW. Bitcoin has better trustworthiness because it is protected by computation.

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