Bitcoin Black



enterprise ethereum bitcoin fake Institutional economists drew a distinction between the management class and the class of 'technical operators' (the people doing the work, in many cases engineers and technicians). The managerial elite consisted of the 'analysts' or 'specialists' who acted as the bureaucratic planners, budgetary allocators, and non-technical managers.bitcoin demo ethereum game the ethereum bitcoin монеты bitcoin background bitcoin minecraft

логотип bitcoin

server bitcoin bitcoin background особенности ethereum cryptocurrency nem bitcoin hardfork boxbit bitcoin bitcoin monkey bitcoin адрес bitcoin capitalization wikileaks bitcoin китай bitcoin транзакции ethereum logo ethereum bitcoin компьютер ethereum clix bitcoin fox registration bitcoin обучение bitcoin продать monero bitcoin графики пулы bitcoin bitcoin открыть monero майнить bitcoin pizza 2 bitcoin ставки bitcoin bitcoin avalon ethereum addresses bitcoin ммвб ethereum info forum bitcoin ethereum transaction captcha bitcoin bcc bitcoin bitcoin форк ethereum blockchain bitcoin биржи moto bitcoin

bitcoin hype

кости bitcoin bitcoin yen bitcoin форк bitcoin center

dance bitcoin

bitcoin evolution bitcoin cap monero сложность information bitcoin

ethereum parity

bcc bitcoin bitcoin map bitcoin scripting 1 bitcoin расчет bitcoin forbot bitcoin bitcoin legal by bitcoin график bitcoin lealana bitcoin credit bitcoin bitcoin россия казино bitcoin bitcoin youtube динамика ethereum ethereum перспективы bitcoin cny

tether wallet

терминалы bitcoin

bitcoin accepted

bitcoin eth

locate bitcoin bitcoin clicker скрипт bitcoin bitcoin novosti time bitcoin

ethereum charts

ethereum russia neo cryptocurrency jax bitcoin bitcoin pay 16 bitcoin автомат bitcoin bitcoin прогноз bitcoin datadir swarm ethereum ethereum проблемы bitcoin dat конференция bitcoin bitcoin платформы ethereum claim bitcoin trader bitcoin майнинга bitcoin bitcoin bloomberg bitcoin статистика робот bitcoin зарегистрировать bitcoin ecdsa bitcoin addnode bitcoin se*****256k1 bitcoin

приложение bitcoin

gemini bitcoin bitcoin get bitcoin statistic сложность monero bitcoin example

ethereum frontier

ethereum online ethereum пулы ethereum купить

футболка bitcoin

pool bitcoin

удвоитель bitcoin bitcoin коллектор ethereum chart global bitcoin bitcoin fan bitcoin настройка сигналы bitcoin bitcoin ads bitcoin habr bitcoin nonce ethereum siacoin bonus bitcoin arbitrage bitcoin инструкция bitcoin cryptocurrency market bitcoin change

bitcoin gif

bitcoin информация bitcoin maps multibit bitcoin майнер bitcoin

bitcoin экспресс

bitcoin nyse bitcoin database MyceliumWhat’s more, it manages to achieve this incredible hash rate whilst remaining efficient when it comes to energy consumption. The unit consumes just 0.075J/GH. That’s around 1480W of power draw. This crushes Bitmain’s flagship model, the Antminer S9, which has a power consumption rating of 0.098J/GH. ethereum регистрация добыча bitcoin bitcoin 4000 bitcoin testnet настройка monero dash cryptocurrency

dark bitcoin

ethereum stratum bitcoin bcc bitcoin download bitcoin redex bitcoin foundation bitcoin transaction bitcoin machines bitcoin pattern today bitcoin bitcoin converter

bitcoin часы

рубли bitcoin ethereum transactions tether приложения

bitcoin лохотрон

credit bitcoin monero wallet майнинга bitcoin bitcoin database bitcoin bitcoin автоматически addnode bitcoin ethereum course bitcoin торговля форум bitcoin сколько bitcoin bitcoin список

bitcoin generator

buying bitcoin

bitcoin fx

карты bitcoin

lazy bitcoin bitcoin matrix

фото bitcoin

ethereum 2017

10000 bitcoin

bitcoin таблица

ethereum сбербанк advcash bitcoin bitcoin wallpaper bitcoin прогнозы ethereum видеокарты ethereum алгоритмы bitcoin программа ethereum pos plus500 bitcoin

microsoft bitcoin

monero usd bitcoin минфин инструкция bitcoin перспектива bitcoin bitcoin биржи ethereum contract monero сложность people bitcoin bitcoin 10

биржи ethereum

bitcoin word In this section, we have elucidated how computers on the Bitcoin network achieves decentralized and distributed consensus at a global scale. We’ve examined why Proof-of-Work is a critical enabler of machine consensus, and how Proof-of-Stake, while flawed, may be used in addition to Proof-of-Work to make human consensus (ie., project governance) more transparent and inclusive. In the next section, we will discuss the value of public cryptocurrency systems when stakeholders are held in a stable balance of power.How Value Accrues In Proof-of-Work Networksпокер bitcoin

tether верификация

bitcoin debian up bitcoin coindesk bitcoin настройка monero kaspersky bitcoin bitcoin nvidia mine monero opencart bitcoin bitcoin прогноз start bitcoin зарабатывать bitcoin ethereum видеокарты

bitcoin компьютер

ethereum ферма datadir bitcoin wirex bitcoin bitcoin обозреватель wechat bitcoin ethereum dag bitcoin config polkadot stingray A stock image representing various types of cryptocurrenciesbitcoin сети bitcoin миллионеры программа ethereum карты bitcoin bitcoin hyip iphone bitcoin bitcoin рост bitcoin fan продать ethereum tera bitcoin bitcoin сервисы bitcoin проверка client ethereum ethereum эфир код bitcoin bitcoin betting bitcoin ishlash ethereum пулы monero новости верификация tether ethereum пул boxbit bitcoin nicehash bitcoin

ethereum coin

трейдинг bitcoin фарминг bitcoin bitcoin coingecko bitcoin valet alpha bitcoin bitcoin grant

locals bitcoin

bitcoin world frontier ethereum faucet bitcoin scrypt bitcoin 3 bitcoin bitcoin formula bitcoin evolution

пополнить bitcoin

api bitcoin ethereum casper free ethereum ultimate bitcoin ethereum проекты bank bitcoin bitcoin лайткоин рост bitcoin sha256 bitcoin

таблица bitcoin

взломать bitcoin hourly bitcoin coins bitcoin ethereum forks connect bitcoin r bitcoin

bitcoin nachrichten

bitcoin delphi бесплатно bitcoin bitcoin symbol ethereum эфир расшифровка bitcoin reddit ethereum buy ethereum bitcoin монеты get bitcoin collector bitcoin a large number of leaf nodes at the bottom of the tree that contain the underlying datasuper bitcoin The legality of Bitcoin mining depends entirely on your geographic location. The concept of Bitcoin can threaten the dominance of fiat currencies and government control over the financial markets. For this reason, Bitcoin is completely illegal in certain places.

bitcoin greenaddress

bitcoin protocol bitcoin paypal ethereum проблемы mining bitcoin bitcoin legal time bitcoin express bitcoin bitcoin generate бесплатный bitcoin bitcoin miner tether верификация half bitcoin free monero проверка bitcoin rx580 monero транзакции ethereum bitcoin cc wisdom bitcoin халява bitcoin bitcoin vk контракты ethereum bitcoin миллионеры bitcoin x2 bitcoin client bitcoin freebitcoin 1080 ethereum бесплатные bitcoin

ethereum токен

bitcoin video ethereum эфир ethereum картинки magic bitcoin mindgate bitcoin 3 bitcoin

tether майнинг

bitcoin tm bitcoin отследить миксер bitcoin bitcoin лохотрон bitcoin millionaire ethereum dao bitcoin pool

bitcoin компания

The network is secured by specialized computer units called miners that are distributed across a large number of unique entities. When you submit a transaction to the Bitcoin blockchain, these miners need to check that you have the necessary Bitcoin to send it, and that various other rules are followed.dat bitcoin bitcoin вконтакте bitcoin ira korbit bitcoin ethereum usd tether clockworkmod сколько bitcoin продажа bitcoin bitcoin взлом ethereum telegram Too much debt → Create more money → More debt → Too much debtBob alone can withdraw a maximum of 1% of the funds per day, but Alice has the ability to make a transaction with her key shutting off this ability.blake bitcoin bitcoin инвестирование easy bitcoin bitcoin darkcoin lamborghini bitcoin bitcoin step капитализация bitcoin ethereum stratum bitcoin продам exmo bitcoin bitcoin code bitcoin london bitcoin видеокарты анонимность bitcoin bitcoin machines bitcoin pay difficulty bitcoin

email bitcoin

bitcoin продать добыча bitcoin bitcoin work lootool bitcoin bitcoin markets

bcc bitcoin

trade bitcoin market bitcoin sberbank bitcoin

bitcoin de

poloniex ethereum bitcoin автоматически символ bitcoin bitcoin red tether приложения bitcoin purse bitcoin котировка top cryptocurrency bitcoin playstation

bitcoin ставки

bitcoin car

monero прогноз stake bitcoin bitcoin отзывы

wikileaks bitcoin

bitcoin frog 777 bitcoin 2018 bitcoin dao ethereum bitcoin com перевод bitcoin bitcoin сети bitcoin master metal bitcoin bitcoin опционы bitcoin maps bitcoin машина стоимость monero moneypolo bitcoin mail bitcoin tether android ann ethereum взлом bitcoin

ethereum erc20

система bitcoin bitcoin доллар youtube bitcoin bitcoin путин bitcoin gold bitcoin main

maining bitcoin

fee bitcoin ethereum cryptocurrency bitcoin hesaplama 100 bitcoin сложность bitcoin

reddit bitcoin

bitcoin accelerator buying bitcoin

майн ethereum

bitcoin презентация пул ethereum Categorizing coins for investmenttether gps алгоритмы ethereum пулы bitcoin ethereum обменять

bitcoin nedir

bitcoin knots boom bitcoin dog bitcoin nodes bitcoin ethereum news биржа ethereum bitcoin change wikileaks bitcoin

bitcoin yen

bitcoin payza bitcoin презентация bitcoin click аккаунт bitcoin

tether майнить

segwit2x bitcoin bitcoin world I’m not trying to criticize or praise Peter Schiff here; just highlighting a recent sentiment sampling.

2016 bitcoin

bitcoin анализ decred ethereum bitcoin fees пулы monero cubits bitcoin The cryptocurrency itself is not in the wallet. In the case of bitcoin and cryptocurrencies derived from it, the cryptocurrency is decentrally stored and maintained in a publicly available distributed ledger called the blockchain.Wondering what is SegWit and how does it work? Follow this tutorial about the segregated witness and fully understand what is SegWit.due to an attack or performance issues. x bitcoin bitcoin инструкция купить bitcoin ethereum фото ethereum zcash сети bitcoin bitcoin plugin cryptonator ethereum

casper ethereum

finney ethereum bitcoin вики

bitcoin стоимость

ethereum обмен

bitcoin book биржа bitcoin bitcoin bcc total cryptocurrency зарабатывать bitcoin bitcoin партнерка

ethereum доходность

testnet bitcoin future bitcoin

ethereum swarm

компиляция bitcoin bitcoin billionaire bistler bitcoin заработка bitcoin комиссия bitcoin ethereum txid bitcoin mining tether верификация bitcoin traffic windows bitcoin

bitcoin отследить

bitcoin income конвертер bitcoin ethereum myetherwallet прогнозы bitcoin machine bitcoin bitcoin майнер se*****256k1 bitcoin bitcoin farm bounty bitcoin bitcoin обои bitcoin сбербанк bitcoin microsoft coin bitcoin кран bitcoin xpub bitcoin coin ethereum icons bitcoin bitcoin таблица ethereum рост monero dwarfpool bitcoin space

tether купить

2 bitcoin coinmarketcap bitcoin 60 bitcoin

бесплатный bitcoin

reddit ethereum платформ ethereum bitcoin вирус проблемы bitcoin accepts bitcoin майн ethereum

сложность monero

bitcoin иконка bitcoin strategy

bitcoin telegram

weekly bitcoin сервер bitcoin порт bitcoin bitcoin statistic monero ico bitcoin вконтакте autobot bitcoin bitcoin вирус forum ethereum bitcoin s twitter bitcoin ethereum биржа bitcoin история bitcoin регистрация bitcoin income bitcoin 2017 блокчейн bitcoin roboforex bitcoin рейтинг bitcoin ethereum news

bitcoin neteller

ethereum история bitcoin 5 bitcoin local british bitcoin

bitcoin pdf

bitcoin 5

bitcoin компания

bitcoin форк

bitcoin exchange

bitcoin darkcoin

bitcoin рубль bitcoin шахты tether android скрипты bitcoin bitcoin код сайте bitcoin ethereum кошельки bitcoin make bitcoin луна ethereum difficulty bitcoin обои

Click here for cryptocurrency Links

Cryptocurrency bubble
From Wikipedia, the free encyclopedia
Jump to navigationJump to search
Ambox current red Americas.svg
Parts of this article (those related to documentation) need to be updated. Please update this article to reflect recent events or newly available information. (January 2021)
Predictions of a collapse of a speculative bubble in cryptocurrencies have been made by numerous experts in economics and financial markets.

Bitcoin and other cryptocurrencies have been identified as speculative bubbles by several laureates of the Nobel Memorial Prize in Economic Sciences, central bankers, and investors.

In 2018, there was a large sell-off of cryptocurrencies. From January to February 2018, the price of bitcoin fell 65 percent. By September 2018, the MVIS CryptoCompare Digital Assets 10 Index had lost 80 percent of its value, making the decline of the cryptocurrency market, in percentage terms, larger than the bursting of the Dot-com bubble in 2002. In November 2018, the total market capitalization for bitcoin fell below $100 billion for the first time since October 2017, and the Bitcoin price fell below $4,000, representing an 80 percent decline from its peak the previous January. From March 8–12, 2020, the Bitcoin price fell by 30 percent from $8,901 to $6,206 (with it down 22 percent on March 12 alone). By October 2020, Bitcoin was worth approximately $13,200.

In November of 2020, Bitcoin again surpassed its previous all time high of over $19,000. After another surge on 3 January 2021 with $34,792.47, bitcoin crashed by 17 percent the next day. Bitcoin traded above $40,000 for the first time on 8 January 2021.


Contents
1 Bitcoin
2 Altcoins
3 Initial coin offerings
4 2017 boom and 2018 crash
4.1 Timeline of the crash
5 Early 2021 Bitcoin boom
6 See also
7 References
8 Further reading
Bitcoin
Further information: Economics of bitcoin

Bitcoin price fluctuations in 2011, 2013 and 2017
Bitcoin has been characterized as a speculative bubble by eight winners of the Nobel Memorial Prize in Economic Sciences: Paul Krugman, Robert J. Shiller, Joseph Stiglitz, Richard Thaler, James Heckman, Thomas Sargent, Angus Deaton, and Oliver Hart; and by central bank officials including Alan Greenspan, Agustín Carstens, Vítor Constâncio, and Nout Wellink.

The investors Warren Buffett and George Soros have respectively characterized it as a "mirage" and a "bubble"; while the business executives Jack Ma and Jamie Dimon have called it a "bubble" and a "fraud", respectively. J.P. Morgan Chase CEO Jamie Dimon said later he regrets calling bitcoin a fraud.

Altcoins
Since the release of bitcoin, over 6,000 altcoins (alternative variants of bitcoin, or other cryptocurrencies) have been created.

A January 2018 article by CBS cautioned about a cryptocurrency bubble and fraud, citing the case of BitConnect, a British company, which received a cease-and-desist order from the Texas State Securities Board. BitConnect had promised very high monthly returns but hadn't registered with state securities regulators or given their office address.

Initial coin offerings
Wired noted in 2017 that the bubble in initial coin offerings (ICOs) was about to burst. Some investors bought ICOs in hopes of participating in the financial gains similar to those enjoyed by early bitcoin or Ethereum speculators.

Binance has been one of the biggest winners in this boom as it surged to become the largest cryptocurrency trading platform by volume. It lists dozens of digital tokens on its exchange.

In June 2018 Ella Zhang of Binance Labs, a division of the cryptocurrency exchange Binance, stated that she was hoping to see the bubble in ICOs collapse. She promised to help "fight scams and shit coins".

2017 boom and 2018 crash
The 2018 cryptocurrency crash (also known as the Bitcoin crash and the Great crypto crash) is the sell-off of most cryptocurrencies from January 2018. After an unprecedented boom in 2017, the price of bitcoin fell by about 65 percent during the month from 6 January to 6 February 2018. Subsequently, nearly all other cryptocurrencies also peaked from December 2017 through January 2018, and then followed bitcoin. By September 2018, cryptocurrencies collapsed 80% from their peak in January 2018, making the 2018 cryptocurrency crash worse than the Dot-com bubble's 78% collapse. By 26 November, bitcoin also fell by over 80% from its peak, having lost almost one-third of its value in the previous week.

Timeline of the crash
December 17, 2017: bitcoin's price briefly reaches its all time high of $19,783.06.
December 22, 2017, bitcoin fell below $11,000, a fall of 45% from its peak.
January 12, 2018, Amidst rumors that South Korea could be preparing to ban trading in cryptocurrency, the price of bitcoin depreciated by 12 percent.
January 26, 2018, Coincheck, Japan's largest cryptocurrency OTC market, was hacked. 530 million US dollars of the NEM were stolen by the hacker, and the loss was the largest ever by an incident of theft, which caused Coincheck to indefinitely suspend trading.
From 26 January to 6 February, the price of bitcoin halved, and reached 6,000 US dollars.[citation needed] Additional negative news for the cryptocurrency market continued in the first quarter of 2018.[citation needed] The price remained low though the level slightly recovered in the first quarter of 2018.[citation needed]
March 7, 2018, Compromised Binance API keys were used to execute irregular trades.
Late March 2018, Facebook, Google, and Twitter banned advertisements for initial coin offerings (ICO) and token sales.
November 15, 2018, bitcoin's market capitalization fell below $100 billion for the first time since October 2017 and the price of bitcoin fell to $5,500.
Early 2021 Bitcoin boom
In early 2021, bitcoin price witnessed another boom, soaring more than 700% since March 2020 and surged above the $40,000 mark for the first time on 7 January. On 11 January, the UK Financial Conduct Authority warned investors against lending or investments in cryptoassets, that they should be prepared "to lose all their money"



Bitcoin’s algorithm limits it to 21 million bitcoins total.Cash transactions offer an increased level of anonymity, yet are still taxed successfully. It is up to you to follow the applicable tax laws in your home country, or face the consequences.sgminer monero fake bitcoin bitcoin магазин bitcoin machine

bitcoin icons

bitcoin обои

bitcoin работа qiwi bitcoin generator bitcoin

ethereum com

wired tether ethereum alliance tcc bitcoin видеокарты ethereum сложность monero ethereum адрес monero simplewallet

bitcoin demo

future bitcoin space bitcoin bitcoin 2010 bitcoin пополнить эфириум ethereum bitcoin конвектор usa bitcoin bitcoin криптовалюта

moneybox bitcoin

bitcoin purse up bitcoin bitcoin adress хайпы bitcoin bitcoin x2 хешрейт ethereum monero обменять monero coin pow bitcoin bitcoin картинки metal bitcoin hashrate bitcoin accepts bitcoin регистрация bitcoin Downloadblitz bitcoin topfan bitcoin locate bitcoin bitcoin proxy робот bitcoin счет bitcoin

bitcoin покупка

cryptocurrency dash

платформа bitcoin

bitcoin продать

bitcoin список bitcoin 3 bitcoin получение bitcoin приложение bitcoin арбитраж casper ethereum bitcoin hash segwit bitcoin bitcoin вектор bitcoin rub

faucet cryptocurrency

ethereum форум bitcoin blue биткоин bitcoin обменники bitcoin foto bitcoin bitcoin авито locate bitcoin deep bitcoin bitcoin express ethereum faucet

bitcoin продать

fire bitcoin bitcoin технология escrow bitcoin The central bank must be trusted not to debase the currency, but the history of fiat#8 Protection of intellectual property

tether wallet

bitcoin книга

arbitrage cryptocurrency ethereum zcash monero форум

bitcoin weekly

ethereum myetherwallet ethereum programming сложность bitcoin bitcoin javascript bitcoin покупка bitcoin мошенничество 123 bitcoin 4000 bitcoin транзакции bitcoin перевод ethereum mini bitcoin bitcoin passphrase When it went live in 2009, Bitcoin was worth zero dollars and zero cents. In April 2011, you could get 1 Bitcoin for $1. On December 17, 2017, Bitcoin had its best day so far. You could trade 1BTC for $20,052! Today, on August 7, 2021, you can trade 1BTC for $11,822. Not bad, right?rx580 monero importprivkey bitcoin пример bitcoin bitcoin обои ethereum перспективы direct bitcoin gadget bitcoin вики bitcoin bitcoin комиссия mining bitcoin падение ethereum

tether 2

free ethereum tether wallet bitcoin хабрахабр е bitcoin keepkey bitcoin bitcoin обменник bitcoin forbes monero обменять mastering bitcoin bitcoin testnet системе bitcoin

rise cryptocurrency

полевые bitcoin bitcoin карты tether wallet bitcoin fake miningpoolhub monero обмен tether bitcoin фарм bitcoin казино компиляция bitcoin bitcoin комиссия bitcoin лого ethereum wallet инструмент bitcoin ethereum pos bitcoin развод

bitcoin сбор

hashrate bitcoin ethereum прогнозы ethereum logo tether отзывы bitcoin daily обмен ethereum казино ethereum difficulty ethereum

бот bitcoin

bitcoin knots bitcoin программа ethereum github bitcoin сбербанк

bitcoin lurkmore

mist ethereum

ethereum вывод

monero gpu

bitcoin proxy

принимаем bitcoin flappy bitcoin sberbank bitcoin bitcoin trade протокол bitcoin миксер bitcoin ethereum стоимость bitcoin loan bitcoin официальный bitcoin information торрент bitcoin bitcoin окупаемость bitcoin кранов txid bitcoin отследить bitcoin british bitcoin bitcoin суть bitcoin india

ethereum decred

карты bitcoin price bitcoin россия bitcoin bitcoin биржи bitcoin switzerland bitcoin оборот monero free nvidia monero bitcoin electrum hacking bitcoin bitcoin de график ethereum love bitcoin bitcoin сигналы

адрес ethereum

bitcoin расчет bitcoin портал moneybox bitcoin dwarfpool monero

bitcoin xbt

bitcoin spend bitcoin development abc bitcoin short bitcoin ethereum addresses bitcoin community bitcoin masternode ethereum видеокарты криптокошельки ethereum poloniex monero ethereum com bitmakler ethereum bitcoin magazine bitcoin hyip bitcoin instant bitcoin hype bitcoin аналоги tether gps bittorrent bitcoin monero fr bitcoin forum ethereum network компиляция bitcoin bitcoin комиссия

video bitcoin

карты bitcoin bitcoin сети bitcoin flapper клиент bitcoin bitcoin bounty youtube bitcoin bitcoin кошелька buying bitcoin to bitcoin

bitcoin fire

bitcoin green ethereum miners ethereum stratum

bitcoin news

c bitcoin отзыв bitcoin bitcoin эмиссия flappy bitcoin bitcoin segwit2x monero прогноз Blockchain explained: a network over a city.Can you imagine how valuable this will be for financial institutes?

bitcoin scam

bitcoin block shot bitcoin armory bitcoin

cryptocurrency wallet

эмиссия ethereum bitcoin server token ethereum ethereum bitcointalk bitcoin карты bitcoin primedice bitcoin change

bitcoin ne

Hashing verifies data integrity, maintains the structure of the blockchain and encodes people’s account addresses and transactions. It also generates the cryptographic puzzles that make block mining possible.Automotive track and traceshort bitcoin что bitcoin bitcoin обвал ethereum coins green bitcoin проверка bitcoin captcha bitcoin ethereum geth bitcoin qr bitcoin registration bitcoin скачать bitcoin vip express bitcoin bitcoin easy

bitcoin buying

bitcoin котировки moon bitcoin wallets cryptocurrency bitcoin dance

отзыв bitcoin

bitcoin linux

config bitcoin hashrate bitcoin bitcoin сервера

конец bitcoin

bitcoin linux

bitcoin bounty

coin bitcoin usa bitcoin block bitcoin портал bitcoin ethereum логотип bitcoin bloomberg

bitcoin миллионеры

golden bitcoin

bitcoin книга bitcoin news blocks bitcoin bitcoin work goldmine bitcoin zebra bitcoin cms bitcoin bitcoin игры bitcoin global usb tether bitcoin tm blogspot bitcoin dark bitcoin surf bitcoin monero bitcointalk bitcoin in пример bitcoin bitcoin мошенники перспективы ethereum blitz bitcoin ethereum вывод ethereum 1080 monero обмен bistler bitcoin in bitcoin