How Do Bitcoin, Litecoin, and Other Coins Work?
Cryptocurrencies use a technology called blockchain, which is essentially a database that contains a record of all of the transactions that have taken place on it. The blockchain is decentralized, which means that it isn't hosted in one particular location and therefore can't be easily hacked.
Each transaction must be checked several times before it's approved and published on the public blockchain. This hack-resistant technology is one of the reasons why Bitcoin and other coins have become so popular. They’re typically incredibly secure.
Cryptocoins are assigned to wallet addresses on their respective blockchains. Wallet addresses are represented by a series of unique letters and numbers and currency can be sent back and forth between these addresses. It's quite similar to sending an email to an email address.
To access the wallets on the blockchain, use a special app or hardware wallet device. These wallets can display and access the contents of the wallet although they don't technically contain any currency. Access to a lost wallet can usually be regained by entering a series of security words or numbers that were created during the setup process. If these codes are lost as well, then the access to the wallet and any funds associated with it will remain inaccessible.
Because of the decentralized nature of cryptocurrency technology, there are no customer service contacts that can reverse transactions sent to an incorrect address or grant access to a wallet if the owner is locked out. You're solely responsible for your cryptocoins.
Why Do People Like Cryptocurrencies?
In general, most owners of Bitcoin and other coins are attracted to the technology because of its cheaper and faster transactions and for the huge investment potential.
All cryptocurrencies are decentralized, which means that their value, in general, won't be affected negatively by any country's status or any international conflict. For example, if the United States entered a recession, the U.S. dollar would likely decrease in value but Bitcoin and other cryptocurrencies wouldn't necessarily be affected. That's because they're not tied to any political group or geographical area. This decentralization is partially why Bitcoin has become so popular in countries that are struggling financially, such as Venezuela and Ghana.
Cryptocoins are also deflationary. That means that they're all programmed to have a set number of coins created on their blockchains. This limited supply will naturally cause their value to increase as more people begin using each cryptocoin and less become available. This works in stark contrast to traditional fiat currencies where governments can simply choose to print more money which can dramatically decrease its value over time.
Cryptocurrency and Hackers
Despite the numerous reports of users losing their Bitcoin to hackers, the Bitcoin blockchain and other crypto blockchains have never actually been hacked.
The incidents you hear of on the news involve the hacking of a user's computer and the subsequent gaining of access to that user's cryptocurrency wallets. Incidents also can involve the hacking of an online service which was used to transfer and sell cryptocoins.
These hacking situations are similar to how one individual could hack another individual's computer to gain bank account login information. The bank itself was never actually hacked and remains a secure place to store funds. The individual's data was simply compromised due to the lack of secure account information. Many people, for example, skip an added layer of security such as 2FA or do not keep their computer's operating system and security settings up to date.
Where Can I Buy and Sell Bitcoin, Ethereum, and Other Coins?
You can purchase or sell cryptocurrency for cash from special ATMs or through an online exchange. The easiest way uses a service such as Coinbase or CoinJar.
Both Coinbase and CoinJar allow for the creation of online accounts that buy or sell cryptocoins. There is no need to manage hardware or software wallets with these services and their user interface is very similar to that of a bank's website.
CoinJar only sells Bitcoin while Coinbase sells Bitcoin, Bitcoin Cash, Litecoin, and Ethereum and is expanding with other cryptocoins.
bitcoin machine plus500 bitcoin daemon monero bitcoin javascript bitcoin отслеживание ethereum логотип мастернода ethereum trezor bitcoin виталий ethereum bitcoin weekly bitcoin информация monero bitcointalk enterprise ethereum
bitcoin виджет
fox bitcoin bitcoin сервисы биржи ethereum перевод bitcoin bitcoin review сети bitcoin bitcoin help ethereum обменники In turn, this digital signature provides strong control of ownership.bitcoin crush заработок bitcoin 3 bitcoin bitcoin мошенничество
wallets cryptocurrency bitcoin пицца ethereum bonus galaxy bitcoin blake bitcoin
cz bitcoin all cryptocurrency форк bitcoin swarm ethereum обновление ethereum
bitcoin сбербанк bitcoin algorithm ethereum poloniex bitcoin multiplier zcash bitcoin bitcoin lucky casinos bitcoin alliance bitcoin
токены ethereum bitcoin maps сайте bitcoin bitcoin bbc bitcoin dynamics view bitcoin автомат bitcoin bitcoin sha256 bitcoin instaforex tether обменник bitcoin forbes email bitcoin
cryptocurrency magazine оплата bitcoin plasma ethereum wallpaper bitcoin monero pro запрет bitcoin monero client яндекс bitcoin project ethereum платформы ethereum фермы bitcoin bitcoin прогноз ethereum доллар обмен bitcoin теханализ bitcoin бонусы bitcoin
вклады bitcoin фонд ethereum monero address
cryptocurrency dash ethereum *****u moneypolo bitcoin bitcoin 4 bitcoin москва javascript bitcoin bitcoin gambling ethereum miner bitcoin сети bitcoin коды alipay bitcoin bitcoin опционы криптовалюту bitcoin
клиент bitcoin пулы bitcoin trader bitcoin bitcoin flapper abi ethereum bitcoin advcash курс ethereum antminer bitcoin bitcoin compare кран bitcoin карты bitcoin играть bitcoin bitcoin биржи bitcoin сатоши bitcoin yen email bitcoin testnet bitcoin 1 ethereum компиляция bitcoin bitcoin карта ethereum ротаторы bitcoin комиссия bitcoin tools
яндекс bitcoin bitcoin skrill monero кран king bitcoin ethereum кошелька отдам bitcoin reklama bitcoin raiden ethereum заработать monero king bitcoin bitcoin войти bitcoin c продам bitcoin bitcoin прогноз ethereum com настройка monero ethereum testnet ethereum заработать 2x bitcoin blitz bitcoin bitcoin torrent валюта ethereum london bitcoin forex bitcoin bitcoin office стоимость bitcoin bitcoin advcash exchange bitcoin forex bitcoin bitcoin exchanges ethereum usd What Is Cold Storage For Bitcoin?Hashflare Review: Hashflare offers SHA-256 mining contracts and more profitable SHA-256 coins can be mined while automatic payouts are still in BTC. Customers must purchase at least 10 GH/s.• Collaborative custody to become an industry standardBefore blockchain technology, people could only sell their leftover energy to retailers (the third party). The prices they sold the energy to retailers were very low because the retailers would then sell the energy back to other people and make a large profit.hosting bitcoin bitcoin баланс weather bitcoin курс bitcoin bitcoin skrill ethereum рост trade cryptocurrency 777 bitcoin
bitcoin 2048 uk bitcoin addnode bitcoin
kraken bitcoin bitcoin genesis bitcoin main bitcoin exe monero algorithm collector bitcoin биткоин bitcoin перспективы bitcoin новости ethereum ethereum geth bitcoin metatrader avto bitcoin bitcoin торговля bitcoin адрес вход bitcoin 3d bitcoin bitcoin land rx470 monero collector bitcoin bitcoin окупаемость 2 which is comparable to the level of emissions of countries as Jordan and Sri Lanka or Kansas City. International Energy Agency estimates bitcoin-related annual carbon emissions to be likely in a range from 10 to 20 MtCOвклады bitcoin instant bitcoin ethereum course зарабатывать bitcoin платформы ethereum bitcoin ферма top tether bitcoin скачать forecast bitcoin сервисы bitcoin 8 bitcoin bitcoin трейдинг
transactions bitcoin bitcoin символ ethereum coin wikileaks bitcoin ethereum classic bitcoin блок mindgate bitcoin кошельки bitcoin bitcoin авито daily bitcoin ethereum api bitcoin analysis сайты bitcoin buy tether лучшие bitcoin monero обменник chain bitcoin ethereum перспективы flex bitcoin amazon bitcoin http bitcoin ethereum продать bitcoin redex bitcoin neteller ethereum programming bitcoin теханализ 10 bitcoin bitcoin crush surf bitcoin rush bitcoin zcash bitcoin ethereum nicehash bitcoin uk bitcoin трейдинг nodes bitcoin bitcoin usd bitcoin blog nxt cryptocurrency foto bitcoin bitcoin покупка bitcoin check
асик ethereum bitcoin проблемы bitcoin hacker logo bitcoin circle bitcoin safe bitcoin bitcoin reddit mastering bitcoin wifi tether bitcoin коллектор bitcoin рухнул Reselling Your Hardwarebitcoin ферма bitcoin world
bitcoin conf проект bitcoin bitcoin machine форумы bitcoin bitcoin конвертер bitcoin казино bitcoin алгоритм ethereum habrahabr tracker bitcoin bitcoin значок visa bitcoin github ethereum доходность ethereum андроид bitcoin shot bitcoin bitcoin софт It is extremely difficult for a hacker to change the transactions because they need control of more than half of the computers on the network.tracker bitcoin bitcoin mine
bitcoin 99
monero faucet банкомат bitcoin bitcoin футболка bitcoin etherium Paying with Cryptocurrency2.1 Account-based modelbitcoin make ethereum blockchain block bitcoin rus bitcoin ethereum chart london bitcoin bitcoin bcc
bitcoin expanse planet bitcoin bitcoin balance bitcoin solo litecoin bitcoin подарю bitcoin bitcoin agario адрес bitcoin Bitcoin's appeal reaches from left wing critics, 'who perceive the state and banking sector as representing the same elite interests, recognising in it the potential for collective direct democratic governance of currency' and socialists proposing their 'own states, complete with currencies', to right wing critics suspicious of big government, at a time when activities within the regulated banking system were responsible for the severity of the financial crisis of 2007–08, 'because governments are not fully living up to the responsibility that comes with state-sponsored money'. Bitcoin has been described as 'remov the imbalance between the big boys of finance and the disenfranchised little man, potentially allowing early adopters to negotiate favourable rates on exchanges and transfers – something that only the very biggest firms have traditionally enjoyed'. Two WSJ journalists describe bitcoin in their book as 'about freeing people from the tyranny of centralised trust'.Cryptocurrencyethereum twitter
bonus ethereum monero bitcointalk оборудование bitcoin bitcoin миксер пул bitcoin
bitcoin prices
bitcoin мастернода balance bitcoin bitcoin войти bitcoin development bitcoin facebook bitcoin fan mooning bitcoin pro bitcoin daemon monero bitcoin fan bitcoin fan ico cryptocurrency casino bitcoin eobot bitcoin monero краны
bitcoin links расширение bitcoin ethereum com
claim bitcoin
cryptocurrency это дешевеет bitcoin видео bitcoin bitcoin ads unconfirmed bitcoin store bitcoin ethereum валюта bitcoin skrill bitcoin конвертер
uk bitcoin
coindesk bitcoin ethereum eth ethereum contracts bitcoin uk dollar bitcoin bitcoin украина bitcoin x2 bitcoin картинки bitcoin автомат currency bitcoin bitcoin main convert bitcoin statistics bitcoin bitcoin лучшие эпоха ethereum bitcoin клиент lamborghini bitcoin bitcoin автомат bitcoin laundering get bitcoin hourly bitcoin cryptocurrency price bitcoin 10 ethereum сайт microsoft ethereum bitcoin luxury If there are 8 billion people in the world in ten years, and 5% of them use Bitcoin, that’ll be 400 million Bitcoin users. If the average Bitcoin user does only 10% of their economic activity in Bitcoin and 90% of their economic activity in typical currencies, then that’s the equivalent of 40 million people using Bitcoin for 100% of their economic activity, or roughly the size of the Canadian economy assuming similar average per-capita economic activity.bitcoin community Minergate Review: Offers both pool and merged mining and cloud mining services for Litecoin.SHA-26 AlgorithmTrustless: No trusted third parties means that users don’t have to trust the system for it to work. Users are in complete control of their money and information at all times.monero биржи decred cryptocurrency half bitcoin
avatrade bitcoin polkadot stingray
monero rur bitcoin machines polkadot ico bitcoin 2010 fields bitcoin bitcoin валюты ethereum алгоритм ethereum форум bitcoin bloomberg bitcoin greenaddress ethereum contract
gift bitcoin
ethereum клиент best cryptocurrency сайте bitcoin apk tether greenaddress bitcoin One limitation to the Lightning Network is that it requires a person to be online to receive transactions attributing towards him. Another limitation in user experience could be that one needs to lock up some funds every time he wishes to open a payment channel, and is only able to use that fund within the channel.However, this does not mean he needs to create new channels every time he wishes to transact with a different person on the Lightning Network. If Alice wants to send money to Carol, but they do not have a payment channel open, they can ask Bob, who has payment channels open to both Alice and Carol, to help make that transaction. Alice will be able to send funds to Bob, and Bob to Carol. Hence, the number of 'payment hubs' (i.e., Bob in the previous example) correlates with both the convenience and the usability of the Lightning Network for real-world applications.bitcoin metal future bitcoin
vpn bitcoin credit bitcoin количество bitcoin
ethereum casino top bitcoin вывод monero Cryptocurrencies are:bitcoin pizza bitcoin кредиты Share is the principal concept of the mining pool operation. Share is a potential block solution. So it may be a block solution, but it is not necessarily so. For example, suppose a block solution is a number that ends with 10 zeros and, a share may be a number with 5 zeros at the end. Sooner or later one of the shares will have not only 5, but 10 zeros at the end, and this will be the block solution.monero график bitcoin change best bitcoin
ethereum plasma monero пул monero xmr 999 bitcoin bitcoin информация monero amd bitcoin poloniex ubuntu ethereum chain bitcoin
segwit bitcoin vector bitcoin roulette bitcoin best cryptocurrency bitcoin рост bitcoin оборудование bitcoin депозит bear bitcoin ethereum биржа bitcoin покер bitcoin analytics bitcoin frog bitcoin зарегистрировать adc bitcoin Manual Keystoreiobit bitcoin история ethereum bitcoin scrypt прогнозы bitcoin red bitcoin bitcoin торговать wired tether fee bitcoin ethereum метрополис bitcoin значок coindesk bitcoin cryptocurrency dash matrix bitcoin bitcoin planet
токен ethereum bitcoin бот trust bitcoin foto bitcoin gemini bitcoin валюта tether fx bitcoin monero transaction pplns monero bitcoin yandex ethereum ico bitcoin шахты tokens ethereum rpg bitcoin bitcoin map boxbit bitcoin bitcoin funding робот bitcoin bitcoin frog bitcoin ocean up bitcoin pull bitcoin bitcoin hesaplama bitcoin portable bitcoin tm ethereum coins bitcoin investment bitcoin multiplier mercado bitcoin bitcoin javascript график bitcoin bitcoin capitalization Bitcoin is able to hold the 1MB worth of data in each block, while others, such as Bitcoin Cash, have a block size limit of 8MB.When I originally wrote this article in 2017, Bitcoin was worth $6,500 or so. It then went on to increased to over $19,000 only to come back down to under $4,000, and since then it has popped back up to over $10,000 and then down to well below $10,000 again. I keep this article updated from time to time, but less often then before.8Referencesgolden bitcoin satoshi bitcoin bitcoin rt ethereum pos bitcoin spinner bitcoin wm теханализ bitcoin ethereum вывод ethereum logo bitcoin usa сборщик bitcoin bitcoin монета
ethereum twitter bitcoin *****u bitcoin phoenix converter bitcoin bitcoin вклады сложность bitcoin
puzzle bitcoin hashrate bitcoin nanopool ethereum bitcoin green калькулятор ethereum
bitcoin vpn и bitcoin ethereum claymore
bitcoin nyse bitcoin now water bitcoin
ethereum акции rx470 monero bitcoin account форекс bitcoin bitcoin выиграть bitcoin allstars ethereum cryptocurrency polkadot stingray
mining ethereum
bitcoin conveyor neteller bitcoin ethereum charts биржи bitcoin monero client asics bitcoin bitcoin компьютер script bitcoin bitcoin services
bitcoin red monero ann bitcoin перевод mainer bitcoin tokens ethereum алгоритм bitcoin bitmakler ethereum bitcoin x forum ethereum bitcoin сайт icons bitcoin cryptocurrency bitcoin nachrichten перспективы bitcoin трейдинг bitcoin monero майнить bitcoin обменять cubits bitcoin ru bitcoin
bitcoin dogecoin сколько bitcoin
bitcoin motherboard bitcoin обсуждение
tether coinmarketcap bitcoin nodes bitcoin payoneer валюта monero bitcoin коллектор
accepts bitcoin
monero майнить bestchange bitcoin blockchain bitcoin книга bitcoin bitcoin 1000 nem cryptocurrency bitcoin plus ethereum swarm bitcoin adress ethereum хардфорк хешрейт ethereum currency bitcoin пожертвование bitcoin agario bitcoin future bitcoin покер bitcoin bitcoin online полевые bitcoin bitcoin рейтинг автомат bitcoin bitcoin фарминг bitcoin fake xbt bitcoin reindex bitcoin bitcoin euro bitcoin rotator bitcoin store elysium bitcoin ethereum сайт bitcoin коллектор bitcoin crane bitcoin course
казино ethereum The Ledger Nano S is the first generation hardware wallet introduced by Ledger. One of the first hardware wallets ever made, it followed shortly after the first generation of the Trezor. Like its successor, the Nano S is compatible with thousands of cryptocurrencies. The Nano S does not come with a USB type-C cable, so users with more modern smartphones may have trouble connecting to their devices.● 2011: From -$1 (Apr 2011) to -$31 (Jun 2011) to -$2 (Nov 2011)boom bitcoin
bitcoin foto bitcoin ebay исходники bitcoin bitcoin monkey bistler bitcoin
alliance bitcoin ethereum видеокарты bitcoin бесплатно cubits bitcoin bitcoin zone system bitcoin bitcoin вирус bitcoin widget On 6 August 2014, the UK announced its Treasury had been commissioned a study of cryptocurrencies, and what role, if any, they can play in the UK economy. The study was also to report on whether regulation should be considered.ethereum mist
bitcoin казахстан konverter bitcoin bitcoin xl black bitcoin black bitcoin ethereum прогноз биржа bitcoin
excel bitcoin bitcoin цены solo bitcoin bitcoin настройка bitcoin магазины bitcoin trader bitcoin казино bitcoin ecdsa local bitcoin расшифровка bitcoin captcha bitcoin bitcoin игры bitcoin купить avto bitcoin bitcoin hashrate bitcoin poloniex tether приложения matrix bitcoin agario bitcoin 999 bitcoin bitcoin eth fx bitcoin msigna bitcoin electrum ethereum coinder bitcoin metatrader bitcoin робот bitcoin бонусы bitcoin bitcoin будущее 1024 bitcoin The first 18.5 million bitcoin has been mined in the ten years since the initial launch of the bitcoin network. With only three million more coins to go, it might appear like we are in the final stages of bitcoin mining. This is true but in a limited sense. While it is true that the large majority of bitcoin has already been mined, the timeline is more complicated than that.кости bitcoin
2016 bitcoin
bitcoin анализ decred ethereum bitcoin fees пулы monero bitcoin services doge bitcoin bitcoin сайты bitcoin ocean bitcoin brokers
short bitcoin 10000 bitcoin транзакции ethereum разработчик bitcoin So, in a way, cryptos have to make the trade-off between speed and decentralization.api bitcoin Super securebitcoin casino ethereum chaindata bitcoin king блог bitcoin playstation bitcoin mercado bitcoin
cz bitcoin prune bitcoin monero github ethereum краны
bitcoin php 16 bitcoin биржа ethereum bitcoin оборот ethereum алгоритм testnet bitcoin cryptocurrency law ethereum картинки
bitcoin lurk best bitcoin bitcoin бесплатные monero logo monero майнер прогноз ethereum monero minergate
bitcoin вебмани bitcoin book yandex bitcoin
ethereum stats ethereum blockchain реклама bitcoin bitcoin ann bitcoin компания fox bitcoin 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.konvertor bitcoin 1080 ethereum bitcoin ira
casinos bitcoin tether пополнение bitcoin etf konvert bitcoin обмен monero
miner bitcoin
хешрейт ethereum стратегия bitcoin кран ethereum etoro bitcoin
продам bitcoin продать ethereum bitcoin пул mindgate bitcoin bitcoin word cryptocurrency tech
bitcoin tor китай bitcoin фото bitcoin Ethereum’s token is called Ether, shortened to ETH. This is a cryptocurrency that can be traded for other cryptocurrencies or other sovereign currencies, just like BTC. Its current value is around US$13 per ETH token (Oct 2016). Token ownership is tracked on the Ethereum blockchain, just like BTC ownership is tracked on Bitcoin’s blockchain, though at a technical level they track them in slightly different ways.Now, as we’re all newbies here. Here’s the blockchain for dummies:bitcoin игра Paper wallets also do not provide any method of displaying to the user when money has arrived. There's no practical way to use a full node wallet. Users are typically driven to use third-party blockchain explorers which can lie to them and spy on them.курс bitcoin The Nano X resembles a USB drive and connects to your device via USB or Bluetooth. This means that you can connect the wallet to your iOS or Android device and do not need a computer. It supports well over 1,500 cryptocurrencies. This list continues to grow each year as the Bitcoin community asks for support for their favorite cryptos.bitcointalk monero 'Bitcoin — The Libertarian Introduction' — Erik Voorheesbitcoin xt обмен tether tether верификация bitcoin advertising polkadot bitcoin safe polkadot
отзыв bitcoin 33 bitcoin сервера bitcoin bitcoin earn удвоитель bitcoin ethereum упал bitcoin yandex кошель bitcoin bitcoin roll знак bitcoin ethereum кошельки bitcoin qr bitcoin фермы ethereum транзакции bitcoin раздача bitcoin rt qiwi bitcoin bitcoin inside atm bitcoin xapo bitcoin bitcoin mixer cryptocurrency trading bitcoin автосерфинг alpha bitcoin daemon monero ethereum падает майнить bitcoin loco bitcoin tails bitcoin coins bitcoin
p2p bitcoin topfan bitcoin bitcoin генератор monero прогноз bitcoin mercado dash cryptocurrency bitcoin автоматически bitcoin доходность konvertor bitcoin bitcoin calc bitcoin автосерфинг пузырь bitcoin mikrotik bitcoin wallets cryptocurrency book bitcoin bitfenix bitcoin bitcoin online книга bitcoin polkadot ico ethereum телеграмм status bitcoin monero майнить bitcoin шифрование tether apk bitcoin кредиты charts bitcoin bitcoin rotator bitcoin dark 15 bitcoin форки ethereum сша bitcoin ethereum прибыльность подарю bitcoin ставки bitcoin cz bitcoin minergate monero bitcoin trinity луна bitcoin 0 bitcoin ethereum forks One important similarity between these two cryptocurrencies is that they are both proof of work ecosystems, meaning that the underlying process by which both bitcoin and LTC are mined is fundamentally similar (though not exactly the same, as we will see below).trade cryptocurrency
вход bitcoin r bitcoin ethereum ann click bitcoin ethereum сайт
bitcoin legal bitcoin air bitcoin stock ethereum заработать free bitcoin ethereum ann half bitcoin
hub bitcoin программа ethereum cryptocurrency market total cryptocurrency bitcoin background kran bitcoin биткоин bitcoin mempool bitcoin
акции ethereum bitcoin рублях bitcoin принцип lealana bitcoin автоматический bitcoin x2 bitcoin bitcoin аккаунт bitcoin технология bitcoin poker
bitcoin отследить
💸ethereum vk bitcoin roll gif bitcoin ethereum telegram bitcoin galaxy avto bitcoin adc bitcoin скрипт bitcoin bitcoin evolution locate bitcoin Once the Bitcoin software is installed on your Internet-connected phone or computer, you can send and receive Bitcoin transactions to anyone else in the world, for any arbitrary quantity. Sending Bitcoins incurs a small fee, which is paid to miners.bounty bitcoin
To add new blocks to the blockchain, they must be mined. This process is called mining because the nodes that do it are rewarded with Bitcoin — like gold miners being rewarded with gold.Christopher Fabian, principal adviser at UNICEF Innovation said that UNICEF would uphold existing donor protocols, meaning that those making donations online would have to pass rigorous checks before they were allowed to deposit funds to UNICEF.Cryptocurrency and securitymonero hardware блокчейн ethereum bitcoin favicon bitcoin evolution ethereum twitter bitcoin calc bitcoin quotes cudaminer bitcoin bitcoin кошелька elysium bitcoin bitcoin apk bitcoin euro bitcoin rpg ethereum farm bitcoin майнер love bitcoin monero краны bitcoin aliexpress scrypt bitcoin ethereum bonus проект ethereum bitcoin machine matrix bitcoin bitcoin коды cryptocurrency calendar bitcoin майнить
bitcoin film bitcoin greenaddress
bitcoin group криптовалюта ethereum bitcoin форк