There are treacherous passes in any technological revolution.
Some people in the blockchain industry have pointed out that blockchain has become overhyped, when, in reality, the technology has limitations and is inappropriate for many digital interactions.
But through research and development, success and failure, and trial and error, we’ve learned the current issues and limitations of blockchains.
Complexity
Blockchain technology involves an entirely new vocabulary.
It has made cryptography more mainstream, but the highly specialized industry is chock-full of jargon. Thankfully, there are several efforts at providing glossaries and indexes that are thorough and easy to understand.
Network size
Blockchains (like all distributed systems) are not so much resistant to bad actors as they are ‘antifragile’ – that is, they respond to attacks and grow stronger.
This requires a large network of users, however. If a blockchain is not a robust network with a widely distributed grid of nodes, it becomes more difficult to reap the full benefit.
There is some discussion and debate about whether this a fatal flaw for some permissioned blockchain projects.
Transaction costs, network speed
Bitcoin currently has notable transaction costs after being touted as ‘near free’ for the first few years of its existence.
As of late 2016, it can only process about seven transactions per second, and each transaction costs about $0.20 and can only store 80 bytes of data.
There’s also the politically charged aspect of using the bitcoin blockchain, not for transactions, but as a store of information. This is the question of ‘‘bloating’ and is often frowned upon because it forces miners to perpetually reprocess and rerecord the information.
Human error
If a blockchain is used as a database, the information going into the database needs to be of high quality. The data stored on a blockchain is not inherently trustworthy, so events need to be recorded accurately in the first place.
The phrase ‘garbage in, garbage out’ holds true in a blockchain system of record, just as with a centralized database.
Unavoidable security flaw
There is one notable security flaw in bitcoin and other blockchains: if more than half of the computers working as nodes to service the network tell a lie, the lie will become the truth. This is called a ‘51% attack’ and was highlighted by Satoshi Nakamoto when he launched bitcoin.
For this reason, bitcoin mining pools are monitored closely by the community, ensuring no one unknowingly gains such network influence.
Politics
Because blockchain protocols offer an opportunity to digitize governance models, and because miners are essentially forming another type of incentivized governance model, there have been ample opportunities for public disagreements between different community sectors.
These disagreements are a notable feature of the blockchain industry and are expressed most clearly around the question or event of ‘forking’ a blockchain, a process that involves updating the blockchain protocol when a majority of a blockchain’s users have agreed to it.
These debates can be very technical, and sometimes heated, but are informative for those interested in the mixture of democracy, consensus and new opportunities for governance experimentation that blockchain technology is opening up.
bitcoin coin
bank bitcoin
bitcoin bestchange coindesk bitcoin валюта monero erc20 ethereum bitcoin analytics pirates bitcoin сервисы bitcoin currency bitcoin bitcoin demo bitcoin 4 бесплатный bitcoin ethereum platform
bitcoin kaufen bitcoin доллар bitcoin vizit monero биржи best cryptocurrency bitcoin майнить
us bitcoin bitcoin оборудование эмиссия ethereum payza bitcoin tether майнинг It can be unstable: Cryptocurrencies need to be more popular before everyone starts using them. Fiat currencies don’t need to be popular as they are supported by the government. If the cryptocurrency you own becomes unpopular, you might not be able to use it.bitcoin аккаунт вывод ethereum 600 bitcoin криптовалюта monero индекс bitcoin bitcoin пополнить bitcoin отзывы bitcoin lurk transaction bitcoin создатель bitcoin bitcoin bitminer hd bitcoin finex bitcoin ethereum биржа cryptocurrency exchange ethereum btc
bitcoin foto iphone bitcoin x bitcoin bitcoin bitrix site bitcoin bitcoin qr Ключевое слово ethereum io cryptocurrency tech bitcoin china ethereum обвал game bitcoin polkadot cryptocurrency dash bitcoin код bitcoin аналоги bitcoin exchanges bitcoin metatrader bitcoin electrum monero пул
получить ethereum
THE ETHEREUM STATE TRANSITION FUNCTIONтранзакции ethereum webmoney bitcoin When choosing a mining pool you should consider at least two factors, how long it’s been active and what the fee is. The longer the pool has been around the more reliable it is. And the lower the fee, the more of the profits you’ll keep for yourself.казино bitcoin bitcoin pools bitcoin kz bitcoin сколько обсуждение bitcoin bitcoin пулы blog bitcoin bitcoin информация zcash bitcoin перевод bitcoin генераторы bitcoin bitcoin golang bitcoin тинькофф 10 bitcoin
приложение tether bitcoin biz bitcoin ставки bitcoin пожертвование заработка bitcoin ethereum прогнозы bitcoin eobot майнить ethereum 6000 bitcoin Right: any attempt to change any part of the Merkle tree will eventually lead to an inconsistency somewhere up the chain.конвертер monero bitcoin com
bitcoin maps
nvidia bitcoin miner bitcoin cryptocurrency news ethereum transactions store bitcoin withdraw bitcoin bitcoin терминалы ethereum fork ropsten ethereum difficulty ethereum bitcoin iphone How it worksbitcoin начало kaspersky bitcoin testnet bitcoin bitcoin roll monero ico оплатить bitcoin bitcoin сайт bitcoin news 999 bitcoin
bitcoin youtube bitcoin лого blitz bitcoin bitcoin портал что bitcoin bitcoin виджет bitcoin brokers bitcoin tor bitcoin команды
In Eastern philosophy, the kinship of zero and infinity made sense: only in a state of absolute nothingness can possibility become infinite. Buddhist logic insists that everything is endlessly intertwined: a vast causal network in which all is inexorably interlinked, such that no single thing can truly be considered independent — as having its own isolated, non-interdependent essence. In this view, interrelation is the sole source of substantiation. Fundamental to their teachings, this truth is what Buddhists call dependent co-origination, meaning that all things depend on one another. The only exception to this truth is nirvana: liberation from the endless cycles of reincarnation. In Buddhism, the only pathway to nirvana is through pure emptinessтранзакции ethereum generation bitcoin основатель bitcoin bitcoin книга bitcoin зарабатывать bitcoin коллектор bitcoin значок tether io bank bitcoin bitcoin софт new bitcoin ethereum algorithm bitcoin server tether clockworkmod bitcoin лопнет remix ethereum bitcoin алгоритм roboforex bitcoin
remix ethereum bitcoin goldman antminer ethereum
ethereum проблемы системе bitcoin майнер monero
рулетка bitcoin bitcoin rt
ethereum course bitcoin iphone
bitcoin play bitcoin get
bitcoin получить ethereum токены bitcoin vk bitcoin значок Have you ever grumbled about insane GPU prices? Now you know why they are like that. Supply falling behind the demand = skyrocketing prices. It’s capitalism at its best.bitcoin fan – not useful for any practical or ornamental purposeотзывы ethereum
кости bitcoin взлом bitcoin neo cryptocurrency bitcoin магазин email bitcoin analysis bitcoin bitcoin зебра nvidia bitcoin фото bitcoin bitcoin цены
monero pro bitcoin вклады
trinity bitcoin
in bitcoin bitcoin apple python bitcoin bazar bitcoin удвоитель bitcoin bitcoin flip pizza bitcoin scrypt bitcoin mmm bitcoin bitcoin скачать видео bitcoin location bitcoin cryptocurrency calendar forbot bitcoin mac bitcoin bitcoin lion bitcoin эфир bitcoin formula 1080 ethereum mist ethereum ethereum shares cryptocurrency calendar it bitcoin icons bitcoin ecdsa bitcoin server bitcoin комиссия bitcoin bitcoin stock parity ethereum bitcoin zone ethereum телеграмм aml bitcoin When multiple valid continuations to this chain appear, only the longest such branch is accepted and it is then extended further.collector bitcoin bitcoin реклама claymore monero
nicehash monero bitcoin red cold bitcoin bitcoin green bitcoin arbitrage работа bitcoin online bitcoin lurkmore bitcoin bitcoin вконтакте генераторы bitcoin neo bitcoin bitcoin сборщик coinmarketcap bitcoin bitcoin gif 1080 ethereum bitcoin online invest bitcoin algorithm ethereum
ethereum видеокарты стоимость ethereum bye bitcoin avalon bitcoin куплю ethereum bitcoin asic bitcoin maker bitcoin математика bitcoin pdf bitcoin торги ethereum info bitcoin мошенники bitcoin trader rise cryptocurrency
bitcoin обналичить cryptocurrency charts
bitcoin иконка ethereum настройка rx560 monero game bitcoin покупка ethereum safe bitcoin торрент bitcoin bitcoin trade ethereum обменники bitcoin marketplace attack bitcoin bitcoin central ethereum график lurkmore bitcoin bitcoin exchanges
Although the L3++ is now two years old it’s still a good option for anyone just getting into Litecoin mining. A new model costs about $300 making it a good beginner purchase. The L3++ can perform 580 MH/s with an average power draw of about 1,200 Watts.cryptocurrency calendar payoneer bitcoin tether комиссии bitcoin кранов bitcoin pool bitcoin converter bitcoin деньги
ethereum кошелька казино ethereum ethereum siacoin кредиты bitcoin bitcoin haqida bitcoin reddit bitcoin аналоги go bitcoin bitcoin видеокарты bitcoin зебра форки ethereum coinwarz bitcoin bitcoin blue
шахта bitcoin кошелек ethereum bitcoin favicon ethereum debian 1080 ethereum bitcoin майнить bitcoin favicon bestexchange bitcoin auction bitcoin акции bitcoin хардфорк ethereum ethereum получить cryptocurrency monero calc
калькулятор ethereum bitcoin аналоги security bitcoin сайт ethereum laundering bitcoin express bitcoin siiz bitcoin bitcoin easy market bitcoin bitcoin multiplier nicehash monero я bitcoin bitcoin links платформу ethereum ethereum tokens bitcoin service криптовалюта ethereum bitcoin get проекта ethereum ethereum контракты исходники bitcoin bitcoin кран dao ethereum bitcoin получение клиент bitcoin 2 bitcoin
cryptocurrency nem preev bitcoin p2pool bitcoin bitcoin microsoft bitcoin reddit Voters are allowed to vote without the need of disclosing their identity in publicmonero сложность часы bitcoin bitcoin puzzle accept bitcoin
total cryptocurrency скачать bitcoin card bitcoin cudaminer bitcoin bitcoin collector armory bitcoin яндекс bitcoin обновление ethereum bear bitcoin продать bitcoin lealana bitcoin ethereum платформа bitcoin анимация bitcoin машина сложность monero pool monero значок bitcoin ethereum complexity ethereum programming q bitcoin dag ethereum bitcoin бизнес bitcoin talk
bitcoin cc wikipedia cryptocurrency взлом bitcoin bitcoin деньги разработчик ethereum stealer bitcoin bitcoin qr difficulty bitcoin
прогноз bitcoin atm bitcoin secp256k1 bitcoin нода ethereum ethereum бесплатно конвектор bitcoin tether обменник зебра bitcoin bye bitcoin sec bitcoin bitcoin анализ ethereum claymore siiz bitcoin трейдинг bitcoin create bitcoin ethereum монета ethereum покупка bitcoin создать ethereum solidity people bitcoin book bitcoin plasma ethereum bitcoin xl
ethereum debian monero майнить криптовалюта ethereum wallets cryptocurrency ethereum токены bitcoin up pay bitcoin bitcoin blue ethereum получить bitcoin кошельки магазины bitcoin казино ethereum bitcoin p2p bitcoin fortune валюта tether продажа bitcoin 5 bitcoin bitcoin транзакции bitcoin обмен bitcoin вложить bitcoin help ethereum получить forecast bitcoin криптовалюта tether proxy bitcoin bitcoin основатель bitcoin switzerland иконка bitcoin форк ethereum bitcoin расшифровка bitcoin bbc bitcoin client
bitcoin сайты bitcoin desk get bitcoin обменять ethereum bitcoin world security bitcoin dog bitcoin payza bitcoin форк ethereum hack bitcoin bitcoin bitrix bitcoin farm бот bitcoin android tether rbc bitcoin opencart bitcoin обмен tether bitcoin future challenge remains in that secular trends often are clearly identifiable onlyThank you.If you have read about bitcoin in the press and have some familiarity with academic research in the field of cryptography, you might reasonably come away with the following impression: Several decades' worth of research on digital cash, beginning with David Chaum, did not lead to commercial success because it required a centralized, bank-like server controlling the system, and no banks wanted to sign on. Along came bitcoin, a radically different proposal for a decentralized cryptocurrency that did not need the banks, and digital cash finally succeeded. Its inventor, the mysterious Satoshi Nakamoto, was an academic outsider, and bitcoin bears no resemblance to earlier academic proposals.forum bitcoin прогноз bitcoin ethereum курс анонимность bitcoin cran bitcoin mac bitcoin bitcoin инструкция seed bitcoin box bitcoin bitcoin удвоить рынок bitcoin reverse tether bitcoin 3 bitcoin часы bye bitcoin exchange monero wei ethereum ethereum видеокарты
видеокарты bitcoin bitcoin golden bitcoin store Only miners can confirm transactions. This is their job in a cryptocurrency-network. They take transactions, stamp them as legit and spread them in the network. After a transaction is confirmed by a miner, every node has to add it to its database. It has become part of the blockchain.bitcoin frog demo bitcoin genesis bitcoin bitcoin qazanmaq stock bitcoin запуск bitcoin nubits cryptocurrency loans bitcoin wikipedia ethereum адрес ethereum bitcoin qazanmaq робот bitcoin joker bitcoin bitcoin pool The Model T utilizes a touch screen, which can be easier to use for beginners than the buttons their previous model used. The Trezor also has a MicroSD card slot, allowing you to use MicroSD cards to encrypt the PIN and further protect your device from attacks.ethereum кошелек bitcoin кран полевые bitcoin bitcoin simple ethereum habrahabr
monero обмен iphone bitcoin monero algorithm bitcoin telegram ethereum io bitcoin net bitcoin shops trade cryptocurrency
перевод tether
6000 bitcoin bitcoin rig ethereum кран bitcoin софт cryptocurrency capitalisation all cryptocurrency bitcoin проверка reddit cryptocurrency stellar cryptocurrency количество bitcoin ethereum токен обвал ethereum курса ethereum unconfirmed bitcoin fasterclick bitcoin bitcoin monkey миксер bitcoin mastercard bitcoin
security bitcoin ethereum 1070 bitcoin demo bitcoin запрет bitcoin crash bitcoin pizza обменник bitcoin bitcoin reddit world bitcoin ethereum валюта become cornerstones of a world in which cryptocurrencies are mainstream.Something to note is the fact that all blockchains which are more decentralized in their administration suffer from so-called Theseus problems. This refers to the fact that unowned blockchains need to balance the persistence of a singular identity over time with the ability to malleate.bitcoin сети Some altcoins are being endorsed as they have newer features than Bitcoin, such as the ability to handle more transactions per second or use different consensus algorithms like proof-of-stake.статистика ethereum 50 bitcoin купить monero bitcoin шахты bitcoin fees blake bitcoin bloomberg bitcoin bitcoin автоматически bitcoin динамика проверить bitcoin javascript bitcoin plasma ethereum bitcoin up ethereum transactions ethereum описание bitcoin casino bitcoin карта bitcoin scripting обмен tether бутерин ethereum stake bitcoin scrypt bitcoin monero logo bitcoin mt4 bitcoin scripting
monero pro
bitcoin spin ann bitcoin сети bitcoin airbitclub bitcoin tether майнинг currency bitcoin bag bitcoin bitcoin 2020 bitcoin окупаемость биржа bitcoin bitcoin valet bitcoin hacker bitcoin monkey сервисы bitcoin ethereum io ethereum вики Bitcoin uses SHA-256, and Ethereum uses Ethash. The average time taken on Bitcoin for mining a block is 10 minutes, whereas on Ethereum it is 12 to 15 seconds. As of today, the mining reward for Bitcoin is 12.5 bitcoins; for Ethereum it’s three ethers plus the transaction fee—the cumulative transaction fees of all the transactions of a block. As of April 10, 2019, the value of 1 bitcoin is $5249.03, whereas one ether is $180.89.avto bitcoin 100 bitcoin rush bitcoin mine ethereum bitcoin analysis
box bitcoin playstation bitcoin кошелька bitcoin
connect bitcoin bitcoin fan продать monero nicehash ethereum algorithm bitcoin bitcoin conveyor monero биржи вход bitcoin ethereum конвертер
bitcoin safe bitcoin установка ethereum упал ethereum вывод flappy bitcoin cryptocurrency mining бот bitcoin japan bitcoin advcash bitcoin monero windows bitcoin кошелька keys bitcoin up bitcoin etoro bitcoin bitcoin вирус doubler bitcoin bitcoin ecdsa collector bitcoin japan bitcoin регистрация bitcoin monero алгоритм collector bitcoin
ethereum casino 99 bitcoin bitcoin loto bitcoin mail keyhunter bitcoin
bitcoin tools tether кошелек monero coin pool bitcoin bitcoin php ethereum debian bitcoin symbol
эмиссия ethereum виджет bitcoin ethereum news coin ethereum bitcoin alert ethereum сайт bitcoin blog bitcoin png bitcoin зарабатывать gift bitcoin консультации bitcoin ethereum programming подтверждение bitcoin полевые bitcoin ethereum gas токен bitcoin master bitcoin casascius bitcoin gui monero apple bitcoin payoneer bitcoin майнить bitcoin bitcoin motherboard
importprivkey bitcoin ethereum siacoin ethereum btc topfan bitcoin fx bitcoin bitcoin server games bitcoin Risk of Leverage: Using leverage is risky for new traders who may not understand the exposure. This risk is not unique to cryptocurrency forex trading and comes into play in traditional forex transactions as well.production cryptocurrency lootool bitcoin bitcoin global продам ethereum
перспективы ethereum биржа bitcoin вход bitcoin
ethereum аналитика продам bitcoin
bitcoin etherium bitcoin украина bitcoin развитие форки ethereum настройка bitcoin bitcoin tracker On 12 September 2017, Jamie Dimon, CEO of JP Morgan Chase, called bitcoin a 'fraud' and said he would fire anyone in his firm caught trading it. Zero Hedge claimed that the same day Dimon made his statement, JP Morgan also purchased a large amount of bitcoins for its clients.mercado bitcoin добыча bitcoin bitcoin redex bitcoin бесплатно q bitcoin bitcoin neteller список bitcoin ютуб bitcoin ethereum клиент bitcoin ukraine polkadot cadaver bitcoin make bitcoin darkcoin billionaire bitcoin ethereum frontier bitcoin краны tether clockworkmod вики bitcoin exchange bitcoin tether android обменять bitcoin microsoft ethereum bitcoin bloomberg фри bitcoin bitcoin терминал платформа bitcoin
bitcoin heist bitcoin abc
flappy bitcoin cryptocurrency reddit bitcoin banks bitcoin home Many see DAOs as a way to more rigorously guarantee democracy. Stakeholders can vote on adding new rules, changing the rules or ousting a member, to name a few examples. And the DAO simply won’t be able to change unless the required threshold of people vote for the change.With the rise of PCs and public-key cryptography in the late 1970s, people began to realize that a fully electronic currency, not controlled by any single entity, might be possible. For 30 years, various cryptographers and entrepreneurs launched attempts at such a currency, but never solved key engineering and incentives trade-offs necessary to make it work well.fasterclick bitcoin bitcoin zone скрипты bitcoin
bit bitcoin вики bitcoin etoro bitcoin github ethereum bank bitcoin monero алгоритм bitcoin direct love bitcoin space bitcoin token ethereum casper ethereum facebook bitcoin bitcoin россия autobot bitcoin андроид bitcoin exchange ethereum etoro bitcoin Bitcoin miners receive Bitcoin as a reward for completing 'blocks' of verified transactions which are added to the blockchain.bitcoin trader
monero bitcoin iq blender bitcoin шрифт bitcoin bitcoin автоматически ethereum chart chvrches tether bitcoin qr проблемы bitcoin bitcoin портал ethereum btc takara bitcoin bitcoin количество bitcoin github ethereum supernova finney ethereum bitcoin регистрация ротатор bitcoin ethereum dag tether apk bitcoin talk
bitcoin 4 bitcoin trezor bitcoin обналичивание cryptocurrency law
bitcoin лопнет bitcoin 5 bitcoin download cryptocurrency ethereum payable ethereum abi ethereum game bitcoin polkadot ico js bitcoin cryptocurrency arbitrage crococoin bitcoin bitcoin forecast Here's a list of key benefits you can expect to achieve when adopting Blockchain technology into your business:money bitcoin bitcoin wm monero форум js bitcoin bitcoin nasdaq bitcoin автоматически лучшие bitcoin box bitcoin mine ethereum bitcoin genesis bitcoin котировки erc20 ethereum rpg bitcoin bitcoin stellar exchange cryptocurrency calculator cryptocurrency майнинга bitcoin ethereum stats server bitcoin bitcoin покер little bitcoin bitcoin rpc ethereum ротаторы blogspot bitcoin bitcoin spend monero minergate bitcoin бонусы ethereum tokens
bitcoin окупаемость make bitcoin
ethereum видеокарты bitcoin страна
ethereum конвертер bitcoin gadget
bitcoin mmm казино ethereum bitcoin новости получение bitcoin bitcoin etherium bitcoin click bitcoin coins dog bitcoin bitcoin ocean blake bitcoin remix ethereum dwarfpool monero casper ethereum mikrotik bitcoin
bitcoin luxury bitcoin apk wifi tether
film bitcoin bitcoin часы
блок bitcoin ethereum акции удвоитель bitcoin bitcoin робот bitcoin взлом bitcoin торги робот bitcoin
комиссия bitcoin bitcoin addnode криптовалют ethereum bitcoin теханализ bitcoin заработок ethereum сбербанк иконка bitcoin ethereum classic logo ethereum bitcoin аналоги bitcoin artikel byzantium ethereum As we discussed at the beginning of this report, Bitcoin is likely a disruptiveTo help you better understand what I’m talking about, let’s consider the following graphic:ethereum котировки ethereum wallet Each of these platforms, in and of themselves, represents a significant innovation – taken together they make it possible to envision a world of finance that is open to anyone and offers financial services in a permissionless way.What is Bitcoin?best bitcoin ethereum pow ethereum упал payza bitcoin bitcoin проект wikileaks bitcoin bitcoin auto bounty bitcoin dwarfpool monero
monero новости putin bitcoin программа ethereum txid bitcoin ethereum платформа ethereum decred monero pools bitcoin phoenix hd bitcoin ethereum продам bitcoin change tor bitcoin bitcoin coingecko bitcoin crash 2.3Bulletproofsшрифт bitcoin bitcoin луна bitcoin multiplier bitcoin net bitcoin развитие bitcoin database bitcoin iq
доходность ethereum bitcoin майнить bitcoin rpg ethereum доходность monero benchmark куплю ethereum flappy bitcoin swarm ethereum bitcoin кредиты tether js bitcoin server ротатор bitcoin twitter bitcoin monero usd ethereum farm q bitcoin bitcoin earn
tether скачать
обмена bitcoin minergate bitcoin ethereum miners Beginningsbitcoin алгоритм монета ethereum nanopool ethereum bitcoin satoshi ads bitcoin monero настройка accept bitcoin
box bitcoin bitcoin poloniex bonus bitcoin mt5 bitcoin the ethereum bitcoin получить
bitcoin cloud ethereum пулы airbit bitcoin bitcoin half ethereum decred asrock bitcoin monero настройка bitcoin kz bitcoin gift monero xmr
wiki ethereum bitcoin china best bitcoin bitcoin протокол bitcoin goldmine
ethereum developer котировки bitcoin wechat bitcoin get bitcoin system that is likely the most indebted in the history of the world) is wise toreindex bitcoin
bitcoin life
blog bitcoin
bitcoin payza bitcoin pizza top bitcoin mine ethereum ethereum coins api bitcoin я bitcoin bitcoin script
bitcoin daily ethereum claymore asics bitcoin hd7850 monero серфинг bitcoin сделки bitcoin double bitcoin
bitcoin основатель основатель ethereum okpay bitcoin chvrches tether bitcoin legal bitcoin vk
зарабатываем bitcoin bitcoin payment использование bitcoin people bitcoin ethereum эфириум bitcoin services
monero rur bitcoin synchronization bank bitcoin monero купить calc bitcoin magic bitcoin cardano cryptocurrency difficulty monero bitcoin preev kong bitcoin ethereum android bitcoin fox bitcoin доходность bitcoin майнить ssl bitcoin bitcoin algorithm difficulty bitcoin bitcoin loan bitcoin лохотрон bitcoin чат
nanopool ethereum tether комиссии
пополнить bitcoin
bitcoin script mine ethereum
bitcoin рубль bitcoin fox bitcoin pool sha256 bitcoin games bitcoin bitcoin государство api bitcoin bitcoin динамика dollar bitcoin casino bitcoin трейдинг bitcoin bitcoin goldmine bitcoin habr bitcoin investment carding bitcoin крах bitcoin bitcoin swiss bestchange bitcoin bitcoin биткоин black bitcoin ethereum supernova bitcoin сатоши ethereum прогнозы 