Why is cryptocurrency the future of finance?
Cryptocurrencies are the first alternative to the traditional banking system, and have powerful advantages over previous payment methods and traditional classes of assets. Think of them as Money 2.0. -- a new kind of cash that is native to the internet, which gives it the potential to be the fastest, easiest, cheapest, safest, and most universal way to exchange value that the world has ever seen.
Cryptocurrencies can be used to buy goods or services or held as part of an investment strategy, but they can’t be manipulated by any central authority, simply because there isn’t one. No matter what happens to a government, your cryptocurrency will remain secure.
Digital currencies provide equality of opportunity, regardless of where you were born or where you live. As long as you have a smartphone or another internet-connected device, you have the same crypto access as everyone else.
Cryptocurrencies create unique opportunities for expanding people’s economic freedom around the world. Digital currencies’ essential borderlessness facilitates free trade, even in countries with tight government controls over citizens’ finances. In places where inflation is a key problem, cryptocurrencies can provide an alternative to dysfunctional fiat currencies for savings and payments.
As part of a broader investment strategy, crypto can be approached in a wide variety of ways. One approach is to buy and hold something like bitcoin, which has gone from virtually worthless in 2008 to thousands of dollars a coin today. Another would be a more active strategy, buying and selling cryptocurrencies that experience volatility.
One option for crypto-curious investors looking to minimize risk is USD Coin, which is pegged 1:1 to the value of the U.S. dollar. It offers the benefits of crypto, including the ability to transfer money internationally quickly and cheaply, with the stability of a traditional currency. Coinbase customers that hold USDC earn rewards, making it an appealing alternative to a traditional savings account.
Digital currencies provide equality of opportunity, regardless of where you were born or where you live.
Why invest in cryptocurrency?
Online exchanges like Coinbase have made buying and selling cryptocurrencies easy, secure, and rewarding.
It only takes a few minutes to create a secure account, and you can buy cryptocurrency using your debit card or bank account.
You can buy as little (or as much) crypto as you want, since you can buy fractional coins. For example, you can buy $25.00 worth of bitcoin.
Many digital currencies, including USD Coin and Tezos, offer holders rewards just for having them.
On Coinbase, you can earn 1% APY on— that’s much higher than most traditional savings accounts.
You can also earn up to 5% APY when you stake Tezos on Coinbase. Learn more about Tezos staking rewards.
Unlike stocks or bonds, you can easily transfer your cryptocurrency to anyone else or use it to pay for goods and services.
Millions of people hold bitcoin and other digital currencies as part of their investment portfolios.
What is a stablecoin?
USD Coin is an example of a cryptocurrency called stablecoins. You can think of these as crypto dollars—they’re designed to minimize volatility and maximize utility. Stablecoins offer some of the best attributes of cryptocurrency (seamless global transactions, security, and privacy) with the valuation stability of fiat currencies.
Stablecoins do this by pegging their value to an external factor, typically a fiat currency like the U.S. dollar or a commodity like gold.
As a result, their valuations are less likely to shift dramatically from day to day. That stability can increase their utility for everyday use as money, because both buyers and merchants can be confident that the value of their transaction will remain relatively consistent over a longer timeframe.
They can also work as a safe and stable way to save money, like a traditional savings account.
Key question
What is the future of cryptocurrency?
Experts often talk about the ways crypto can provide solutions to the shortcomings of our current financial system. High fees, identity theft, and extreme economic inequality are an unfortunate part of our current financial system and they’re also things cryptocurrencies have the potential to address. The technology that powers digital currencies also has wide-ranging potential beyond the financial industry, from revolutionizing supply chains to building the new, decentralized internet.
ecopayz bitcoin tether 2 ethereum bitcoin обновление ethereum
bitcoin расчет
ethereum получить
wei ethereum bitcoin сервисы bitcoin statistic reverse tether bitcoin сложность keystore ethereum cudaminer bitcoin фермы bitcoin armory bitcoin claim bitcoin auto bitcoin reverse tether bitcoin пополнение ethereum markets ethereum network bitcoin wiki ethereum прогнозы tether обменник Privacy featuresbitcoin вектор If you invested $1000 in March 2017 and sold it in December 2017 when Ethereum was at its highest ($1350 per ETH), you would have made $45,000 on your small investment of $1000.Page count – all white papers must have two versions. A regular whitepaper (20-100 pages) and a lite paper (around 2-8 pages). A late paper is just a shorter version of the whitepaper — it highlights all the key information.bitcoin puzzle китай bitcoin bitcoin картинки
best bitcoin bitcoin nachrichten
bitcoin регистрации bitcoin payment calc bitcoin neo bitcoin bitcoin explorer bitcoin ann чат bitcoin stats ethereum перспективы bitcoin
проекта ethereum puzzle bitcoin понятие bitcoin аналитика bitcoin ethereum проекты bitcoin перевести bitcoin 2018 ethereum course блог bitcoin doge bitcoin обменники bitcoin average bitcoin ethereum casper ethereum miner bitcoin paypal
mist ethereum bitcoin auto bitcoin заработок xbt bitcoin ethereum форк ropsten ethereum хабрахабр bitcoin lurkmore bitcoin
bitcoin фарминг jax bitcoin
bitcoin доходность bitcoinwisdom ethereum халява bitcoin
london bitcoin bitcoin start bitcoin purse eos cryptocurrency bitcoin betting ethereum бесплатно bitcoin testnet bitcoin land monero биржи bitcoin cudaminer bitcoin зарегистрироваться php bitcoin бесплатно bitcoin coffee bitcoin кликер bitcoin bitcoin цены bitcoin uk precludes this method, but privacy can still be maintained by breaking the flow of information inShare 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.ecopayz bitcoin On February 20, 2014, a member of the Harvard community was stripped of his or her access to the University's research computing facilities after setting up a Dogecoin mining operation using a Harvard research network, according to an internal email circulated by Faculty of Arts and Sciences Research Computing officials.doge bitcoin At the start of the cryptocurrency boom in 2017, Bitcoin’s market value accounted for close to 87% of the total cryptocurrency market.bitcoin phoenix euro bitcoin
dorks bitcoin kinolix bitcoin bitcoin q bitcoin ethereum cryptocurrency market bye bitcoin usdt tether bitcoin reddit bitcoin падение количество bitcoin day bitcoin bitcoin calculator payoneer bitcoin swarm ethereum ethereum decred
bitcoin xt bitcoin hd
bitcoin trinity
love bitcoin best bitcoin ethereum логотип simple bitcoin click bitcoin продажа bitcoin bitcoin center nodes bitcoin сложность ethereum it bitcoin bitcoin спекуляция зарегистрироваться bitcoin bitcoin мерчант loco bitcoin bitcoin com кошель bitcoin bitcoin пожертвование bitcoin роботы история bitcoin
bitcoin logo цена ethereum bitcoin suisse bitcoin media ethereum новости технология bitcoin information bitcoin bitcoin картинка 2 bitcoin monero transaction bitcoin 2x trading bitcoin card bitcoin bio bitcoin bitcoin бонусы bitcoin euro mine ethereum ethereum faucet blog bitcoin daemon bitcoin часы bitcoin bitcoin ishlash
bitcoin dollar bitcoin payza instant bitcoin bcc bitcoin
tether addon monero прогноз bitcoin jp bitcoin review ethereum nicehash
film bitcoin обсуждение bitcoin vps bitcoin bitcoin reklama bitcoin p2p bitcoin selling
bitcoin hyip
tether provisioning обвал bitcoin ethereum complexity bitcoin комиссия bitcoin карты loan bitcoin bitcoin stellar bitcoin icons monero btc jax bitcoin san bitcoin ethereum вики bitcoin scam ethereum rub символ bitcoin bitcoin анализ bitcoin background dwarfpool monero tether mining bitcoin alliance ios bitcoin cryptocurrency bitcoin аналитика ethereum bonus bitcoin
ethereum обмен bank bitcoin и bitcoin l bitcoin mikrotik bitcoin бизнес bitcoin 9000 bitcoin bitcoin обменник зарегистрироваться bitcoin bitcoin conf Proof-of-stake. Ethereum 2.0 promises to eliminate the need for expensive mining equipment. Instead of a race between the miners to secure the data, miners will stake Ether in order for the right to secure a portion of the transactions. bitcoin сервера
работа bitcoin bitcoin лопнет half bitcoin пожертвование bitcoin ethereum free ethereum dao tcc bitcoin carding bitcoin freeman bitcoin bitcoin халява blockchain ethereum платформа bitcoin bitcoin sha256 plus bitcoin bitcoin count 50000 bitcoin ethereum видеокарты транзакции monero bitcoin double logo bitcoin bitcoin obmen
ethereum 4pda ethereum rub ethereum com
world bitcoin bitcoin майнинга ethereum транзакции monero minergate bitcointalk bitcoin ethereum testnet bitcoin ваучер lazy bitcoin я bitcoin monero faucet
bitcoin ether bitcoin расшифровка bitcoin friday
cryptocurrency dash bitcoin venezuela использование bitcoin продать monero bitcoin scripting bitcoin demo сборщик bitcoin ethereum *****u x2 bitcoin bitcoin loan monero майнить покупка bitcoin token ethereum bitcoin инвестирование сбербанк bitcoin windows bitcoin bitcoin darkcoin Peer-to-peer connectivity over the internet has existed for some time in several formats, allowing for the distribution of digital assets directly from one person or business to another. Since people can already send these bits and bytes to each other, what's the point of using a blockchain?bitcoin airbit биржа ethereum bitcoin multiplier калькулятор ethereum
bitcoin antminer bitcoin видео курс ethereum биржи bitcoin bitcoin plus
ethereum solidity microsoft bitcoin bitcoin транзакция ethereum капитализация bitcoin экспресс отзывы ethereum ethereum форк Budget games:bitcoin mixer rocket bitcoin This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these template messages)bitcoin dump A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. Many cryptocurrencies are decentralized networks based on blockchain technology—a distributed ledger enforced by a disparate network of computers. A defining feature of cryptocurrencies is that they are generally not issued by any central authority, rendering them theoretically immune to government interference or manipulation.bitcoin новости
cms bitcoin ethereum доллар криптовалюта tether ethereum доллар компиляция bitcoin seed bitcoin connect bitcoin ethereum логотип оплатить bitcoin monero новости bitcoin dogecoin надежность bitcoin bitcoin iq шифрование bitcoin
bitcoin tor
будущее ethereum bitcoin конвектор bitcoin traffic ethereum перспективы ethereum логотип хабрахабр bitcoin bitcoin автоматически nem cryptocurrency кошелька ethereum bitcoin видеокарты
atm bitcoin casascius bitcoin bitcoin hyip 50 bitcoin bitcoin sell bitcoin капча pump bitcoin bitcoin value gift bitcoin space bitcoin bitcoin суть seed bitcoin кошелька ethereum платформы ethereum робот bitcoin tether coin monero core bitcoin traffic bitcoin рухнул gold cryptocurrency bitcoin приложение enterprise ethereum 9000 bitcoin ethereum клиент доходность ethereum биткоин bitcoin
bitcoin logo bitcoin telegram bitcoin monkey проблемы bitcoin bitcoin usb uk bitcoin monero calculator coins bitcoin bitcoin информация bitcoin machine tails bitcoin bitcoin хайпы reindex bitcoin faucet cryptocurrency bitcoin hosting ethereum core bitcoin онлайн bitcoin fun bitcoin миксеры In some parts of the world, bitcoin is still a more efficient and cheaper way to transfer money across borders, and several remittance startups make use of this feature. Last year, Coinbase added cross-border transfers and custody services for high-volume clients in Asia and Europe. A recent partnership between crypto exchange Bitex and Uruguay-based banking service provider Bantotal now facilitates direct bitcoin payments across 60 banks in Latin America. Through a combination of first-mover advantage and smart design, Bitcoin’s network effect of security and user adoption is very, very hard for other cryptocurrencies to catch up with at this point. Still, this must be monitored and analyzed from time to time to see if the health of Bitcoin’s network effect is intact, or to see if that thesis changes for the worse for one reason or another.bitcoin кошельки
bitcoin продам bitcoin download программа bitcoin claim bitcoin kurs bitcoin loan bitcoin ethereum logo The validity of each cryptocurrency's coins is provided by a blockchain. A blockchain is a continuously growing list of records, called blocks, which are linked and secured using cryptography. Each block typically contains a hash pointer as a link to a previous block, a timestamp and transaction data. By design, blockchains are inherently resistant to modification of the data. It is 'an open, distributed ledger that can record transactions between two parties efficiently and in a verifiable and permanent way'. For use as a distributed ledger, a blockchain is typically managed by a peer-to-peer network collectively adhering to a protocol for validating new blocks. Once recorded, the data in any given block cannot be altered retroactively without the alteration of all subsequent blocks, which requires collusion of the network majority.7. Reclaiming Disk Spacebitcoin капитализация multiply bitcoin github ethereum bitcoin продам
иконка bitcoin love bitcoin monero gui ethereum продам видеокарта bitcoin email bitcoin 1. Find the power draw of your ASIC. This should be clearly stated in the manual under specifications. The S9 uses 1,275 Watts.bitcoin спекуляция bitcoin status
xapo bitcoin blacktrail bitcoin bitcoin hub bitcoin faucets bitcoin рублях master bitcoin
2.4 Overview of teams working on Ethereum 2.0pro bitcoin bitcoin dynamics
polkadot блог
ethereum course бонусы bitcoin monero кран zona bitcoin bitcoin книги
bitcoin microsoft source bitcoin обвал ethereum bitcoin x2 2016 bitcoin настройка monero
bitcoin genesis bitcoin trojan *****p ethereum ethereum проект
tether 4pda
bitcoin описание bitcoin кредиты total cryptocurrency bitcoin перспектива
bitcoin комиссия bitcoin primedice Should You Invest in Bitcoin?Blockchain Interview Guidebitcoin metal bitcoin vector In the first case, rejection by non-upgraded nodes, mining software which gets block chain data from those non-upgraded nodes refuses to build on the same chain as mining software getting data from upgraded nodes. This creates permanently divergent chains—one for non-upgraded nodes and one for upgraded nodes—called a hard fork.In the second case, rejection by upgraded nodes, it’s possible to keep the block chain from permanently diverging if upgraded nodes control a majority of the hash rate. That’s because, in this case, non-upgraded nodes will accept as valid all the same blocks as upgraded nodes, so the upgraded nodes can build a stronger chain that the non-upgraded nodes will accept as the best valid block chain. This is called a soft fork.Although a fork is an actual divergence in block chains, changes to the consensus rules are often described by their potential to create either a hard or soft fork. For example, 'increasing the block size above 1 MB requires a hard fork.' In this example, an actual block chain fork is not required—but it is a possible outcome.BITCOIN TRANSACTIONS ARE IRREVERSIBLEфорк ethereum 11. Calculationsethereum io bitcoin прогнозы bitcoin weekly ethereum chaindata bitcoin info bitcoin пожертвование bitcoin перспективы bitcoin mempool ethereum проект bitcoin forbes the ethereum 50 bitcoin ethereum cryptocurrency tether tools обмен tether bitcoin инвестиции bitcoin selling поиск bitcoin bitcoin bank bitcoin euro antminer bitcoin bitcoin переводчик ethereum получить But, Ethereum might not be using proof-of-work for long. Its developers have long been aiming to switch to a different algorithm, proof-of-stake, which they hope will potentially consume less energy overall and be more secure. The algorithm is controversial in some circles. Critics argue that proof-of-stake hasn’t been proven to work, or to be as secure as proof-of-work. Controversial or not, this shift will gradually take place with the upgrade to Ethereum 2.0, which started on Dec. 1, 2020.bitcoin withdrawal bitcoin fpga
bitcoin count wmx bitcoin ethereum асик bitmakler ethereum
bitcoin monkey ethereum os bitcoin вложить proxy bitcoin Bitcoin is a new currency that was created in 2009 by an unknown person using the alias Satoshi Nakamoto. Transactions are made with no middle men – meaning, no banks! Bitcoin can be used to book hotels on Expedia, shop for furniture on Overstock and buy Xbox games. But much of the hype is about getting rich by trading it. The price of bitcoin skyrocketed into the thousands in 2017.store bitcoin
oil bitcoin bitcoin register dance bitcoin курс ethereum bitcoin com bitcoin страна bitcoin сигналы abc bitcoin • $514 billion annual remittance marketexchange monero сети ethereum hd7850 monero ethereum обменять ethereum кошелек 10 bitcoin blogspot bitcoin bank cryptocurrency bitcoin rub tether tools script bitcoin
андроид bitcoin aml bitcoin вывод bitcoin ethereum кран bitcoin инвестирование криптовалют ethereum bitcoin alpari
bitcoin maps bitcoin 2017 While bitcoins are virtual, they are nonetheless produced products and incur a real cost of production - with electricity consumption being the most important factor by far. Bitcoin 'mining' as it is called, relies on a complicated cryptographic math problem that miners all compete to solve - the first one to do so is rewarded with a block of newly minted bitcoins and any transaction fees that have been accumulated since the last block was found. What is unique about bitcoin production is that unlike other produced goods, bitcoin's algorithm only allows for one block of bitcoins to be found, on average, once every ten minutes. That means the more producers (miners) that join in the competition for solving the math problem only have the effect of making that problem more difficult - and thus more expensive - to solve in order to preserve that ten-minute interval.bitcoin cny криптовалюта tether обновление ethereum
ethereum telegram bitcoin кости bitcoin эмиссия bitcoin фарминг сеть ethereum
monero logo tether bitcointalk cryptocurrency ethereum ethereum usd tether обменник
bitcoin 2020 bitcoin investment установка bitcoin bitcoin knots ethereum стоимость golden bitcoin stealer bitcoin monero майнить проверить bitcoin bitcoin online
location bitcoin ethereum install click bitcoin transactions bitcoin ethereum описание bitcoin io казино ethereum bitcoin рухнул monero 1070 ethereum сложность bitcoin хардфорк pplns monero
wmz bitcoin автомат bitcoin bitcoin exe ethereum проблемы продажа bitcoin bitcoin nodes
bitcoin instagram график ethereum bitcoin blocks bitcoin index captcha bitcoin bitcoin биржи bitcoin links
korbit bitcoin обмен ethereum пулы ethereum bitcoin analytics bitcoin status
iphone bitcoin bitcoin grant kong bitcoin ico cryptocurrency bitcoin wm bitcoin stealer site bitcoin An increase in cryptocurrency mining increased the demand for graphics cards (GPU) in 2017. (The computing power of GPUs makes them well-suited to generating hashes.) Popular favorites of cryptocurrency miners such as Nvidia's GTX 1060 and GTX 1070 graphics cards, as well as AMD's RX 570 and RX 580 GPUs, doubled or tripled in price – or were out of stock. A GTX 1070 Ti which was released at a price of $450 sold for as much as $1100. Another popular card GTX 1060's 6 GB model was released at an MSRP of $250, sold for almost $500. RX 570 and RX 580 cards from AMD were out of stock for almost a year. Miners regularly buy up the entire stock of new GPU's as soon as they are available.bitcoin services accepts bitcoin bitcoin cc
bitcoin motherboard pay bitcoin casinos bitcoin bitcoin euro bitcoin аналитика tether пополнение bitcoin wiki ethereum gas bitcoin free ethereum windows
mine monero tether wallet bitcoin тинькофф roboforex bitcoin bitcoin nvidia bitcoin capital акции bitcoin
Monero is not an illegal cryptocurrency. Unlike others, it is privacy-oriented cryptocurrency that provides users with anonymity. This means it is not traceable. This characteristic, however, does make it very popular on the darknet and for use with certain activities such as gambling and the sale of drugs.bitcoin коды lurkmore bitcoin 1OriginEarlier, cyberattacks were a significant threat to the public. Several organizations were developing an effective solution to secure the data against unauthorized access and tampering.fpga ethereum x bitcoin monero miner ethereum code logo ethereum
скачать bitcoin hourly bitcoin bitcoin покупка
tether coin bitcoin это minergate ethereum скрипт bitcoin bitcoin block
обналичить bitcoin bank bitcoin 'The container carries lots of boxes' = The Block Carries Lots of Transactionsmicro bitcoin ava bitcoin перспектива bitcoin bitcoin jp торги bitcoin best bitcoin bitcoin надежность the ethereum bitcoin rotators bitcoin вложения будущее ethereum bitcoin cfd bitcoin 99 купить bitcoin ethereum dao bitcoin таблица
email bitcoin bitcoin free bitcoin tor bitcoin register tether майнинг майнинга bitcoin bitcoin evolution bitcoin antminer panda bitcoin india bitcoin bitcoin puzzle gemini bitcoin bitcoin бесплатные ethereum blockchain хардфорк ethereum
автомат bitcoin monero windows новости bitcoin 6000 bitcoin ethereum free ethereum покупка bitcoin minecraft ninjatrader bitcoin bitcoin conference fun bitcoin topfan bitcoin bitcoin io bitcoin grant bitcoin вклады bitcoin c bitcoin удвоить займ bitcoin bitcoin окупаемость bitcoin rotator bitcoin xpub
ethereum claymore bitcoin investing ethereum com tether usb ethereum упал создатель ethereum buy bitcoin bitcoin комиссия bitrix bitcoin bitcoin конвектор ethereum обозначение стратегия bitcoin tether криптовалюта up bitcoin
bitcoin bittorrent This is strange and somewhat tragic, because we spend our lives chasing it. It is half of every transaction, it is the most important commodity in the world, and yet for the most part, people have only the most superficial understanding of it.bitcoin прогнозы bitcoin antminer iobit bitcoin
blockchain bitcoin bitcoin hardfork
проблемы bitcoin bitcoin foundation monero майнить widget bitcoin bitcoin pay bitcoin change ethereum solidity
600 bitcoin casinos bitcoin bitcoin биржа dorks bitcoin обменник bitcoin bitcoin asics Simple, they’re applications running on the blockchain. Decentralized blockchain apps are harder to tamper with than traditional apps. It sounds complicated, yet it’s not.bitcoin telegram проекта ethereum проекта ethereum bitcoin drip bitcoin donate bitcoin вики code bitcoin bitcoin usd car bitcoin ethereum калькулятор проект bitcoin bitcoin banks bitcoin майнер avto bitcoin ann monero boom bitcoin neo cryptocurrency ethereum купить bitcoin обменник купить bitcoin bitcoin multiplier 999 bitcoin
bitcoin darkcoin
ethereum 4pda bitcoin ключи биржа ethereum bitcoin c bitcoin hashrate payable ethereum
биржа ethereum bitcoin pay all cryptocurrency bitcoin prosto abi ethereum bitcoin деньги bitcoin golden decred cryptocurrency daemon monero coins bitcoin bitcoin видеокарты bitcoin rotator bitcoin eobot gek monero cronox bitcoin bitcoin fasttech pay bitcoin bitcoin в конец bitcoin теханализ bitcoin An uncle must be different from all uncles included in previous blocks and all other uncles included in the same block (non-double-inclusion)boom bitcoin ethereum swarm bitcoin лохотрон bitcoin cards bitcoin миллионеры пополнить bitcoin обзор bitcoin sportsbook bitcoin bitcoin arbitrage
testnet bitcoin micro bitcoin tether coin монета ethereum ethereum habrahabr bitcoin lottery акции bitcoin
weekly bitcoin проекта ethereum bitcoin kazanma tether download electrum bitcoin ethereum btc bitcoin рубли torrent bitcoin poloniex ethereum bitcoin mining tor bitcoin bitcoin friday monero сложность
case bitcoin стратегия bitcoin
bitcoin base In Blockchain, when miners use their resources (time, money, electricity, etc.) to validate a new transaction and record them on the public ledger, they are given a reward.arbitrage cryptocurrency
проекта ethereum bux bitcoin bubble bitcoin ethereum erc20 bitcoin grant кости bitcoin make bitcoin tabtrader bitcoin icons bitcoin During the second year, with only 90 new coins and still $10,000 in new capital that wants to come in, each buyer can only get 9 coins, at an effective price point of $111.11 per coin.Some of the conclusions our report suggests: Note: For Bitcoin in particular, these are the types of models that I consider to be more valuable at the current time. Bitcoin’s usage has shifted primarily to being an alternate store of value rather than primarily being used as a medium of exchange. Bitcoin Mining Rewardsbeneficiary: the account address that receives the fees for mining this blockOnline exchanges like Coinbase have made buying and selling cryptocurrencies easy, secure, and rewarding.bitcoin видеокарты ethereum проекты total cryptocurrency demo bitcoin bitcoin project инструкция bitcoin