What is Ethereum?
World computer, truth machine – with the second-largest cryptocurrency
fundamentals-ethereum
Since its birth in 2015, Ethereum has been focused on one core principle: decentralization.
This vision holds that a new kind of internet can make it possible to transfer value independent of 3rd-parties and eliminate the weaknesses and security risks of centralized data storage and applications.
Ethereum’s native cryptocurrency, Ether (ETH), which helps power the Ethereum blockchain and keep it secure, has risen in value to become the second-largest cryptocurrency by market capitalization.
To understand the power of Ethereum and the promise of decentralization that it seeks to attain, it helps to take a closer look at what it is and how its innovations, including smart contracts, can potentially change many aspects of the world we live in.
The Beginnings of Ethereum
After the birth of Bitcoin, developers in the crypto space made many attempts to extend the possibilities of the Bitcoin blockchain for other use cases beyond peer-to-peer payments and finance.
One such developer was Vitalik Buterin. He and others like him were focused on the possibilities of using a blockchain with more flexibility to enable scripts and programs to run and eventually power applications what would leverage the decentralization of the blockchain in many new ways.
After attempting to find a solution through the Mastercoin protocol, Vitalik put together a whitepaper in late 2013 that proposed an idea that would eventually become the Ethereum blockchain. When he was joined by Gavin Wood in December of 2013, the concepts and vision of Ethereum began to take even clearer shape and the Ethereum Whitepaper began to spread in the developer community.
In the following months, the community grew quickly and attracted numerous others including Joe Lubin, Mihai Alisie, Charles Hoskinson and more. The core group of developers and proponents ended up coming to Zug, Switzerland to set up a foundation in support of the vision that they had laid out.
In July 2014, the Ethereum Foundation conducted a crowdsale in which it sold over 50 million ETH to the public. The following year, on 30 July 2015, the genesis block of the Ethereum blockchain was mined and the Ethereum journey towards decentralization began in earnest.
Ethereum as the World Computer
What began in 2015 was more than the launch of another cryptocurrency with its own blockchain. The vision was to create a world computer.
What does this mean?
Think for a moment about what a blockchain was originally designed to do – store a distributed record of transactions of a peer-to-peer electronic cash (Bitcoin). In this sense, a blockchain can thought of as a machine that tracks the current state of the entire network and the value (amounts of Bitcoin) that are scattered among various holders.
When Bob sends a certain amount of Bitcoin to Alice, the Bitcoin blockchain records this transaction – in other words it updates the current state of the ledger and takes note that Bob now has less Bitcoin and Alice has more.
Similarly, Ethereum records the transactions of ETH. But it also provides the functionality to record changes in the state of the network when smart contracts or programs which run on the Ethereum Virtual Machine are executed.
This might not seem like a difficult or revolutionary thing, until we think about the implications. Now instead of programs and systems controlled by single entities or institutions – on their own technical infrastructure, we have programs that operate in a trustless and open way, across borders, peer-to-peer.
This enables decentralized applications (dApps) which do not live just on one computer or server, to operate even if they may have various inputs and changes in state over time. The consensus mechanism of the blockchain helps maintain their integrity even without intermediaries or counter-parties.
Now with all of this, we get a system which can execute programs over and over again, anywhere in the world, with guaranteed code execution because the logic is embedded on the blockchain.
In other words, we get a world computer.
Ethereum as a smart contract platform
The programs – or more accurately scripts – which run on the Ethereum blockchain are commonly referred to as smart contracts.
Let’s take a look at an example—a decentralized application for flight delay insurance. The heart of the application is a smart contract – a program running on the Ethereum blockchain – which can:
Accept premiums (in ETH) from passengers wishing to buy flight delay insurance for their journey
Calculate the risk and premium level for individual flights based on historical data and current weather information (provided by so-called oracles)
Determine if the flight had been delayed based on a link to flight tracking database
Automatically distribute the correct insurance payout to passengers who were on a delayed flight.
Obviously, such insurance is available today from various providers around the world, but using the Ethereum blockchain allowed the flight delay insurance application to automate the entire process from the insurance policy setup to the moment of payout, and made it possible for people in different places to interact with the system without cumbersome paperwork or one centralized authority and ultimately provide a much better customer experience.
This is just one example of a smart contract in action. Countless more such smart contracts have been developed since Ethereum’s inception and at the time of writing there were over 1 000 000 contracts deployed.
Ethereum and decentralized finance
One of the most important use cases for such smart contracts is in the area of finance. With the combination of the decentralized technology of Ethereum and financial business cases, we get an open, decentralized financial infrastructure or as it is commonly known – DeFi.
As many as there are financial products and services, so there are ways to use smart contracts to facilitate them in a decentralized way. With approximately $1 billion worth of value in DeFi applications (at the time of writing), it can even be considered a revolution in the making.
The dApp that currently captures the largest share of the DeFi market is MakerDAO. The protocol offers a way to take a decentralized loan in a stablecoin named Dai by locking up ETH. Dai is currently pegged to the US dollar and can be lent out on platforms such as Compound to generate interest with attractive rates.
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.
There are 180 internationally recognized currencies in circulation, ranging from the Samoan tala to the Burmese kyat. Just like with regular currency, there are multiple cryptocurrencies too. Because it was the first, bitcoin gets all the publicity, but it competes against dozens of aspiring alternatives – one of which is litecoin. invest bitcoin Obviously, such insurance is available today from various providers around the world, but using the Ethereum blockchain allowed the flight delay insurance application to automate the entire process from the insurance policy setup to the moment of payout, and made it possible for people in different places to interact with the system without cumbersome paperwork or one centralized authority and ultimately provide a much better customer experience.Products and services that run on Ethereum. There are dapps for finance, work, social media, gaming and more – meet the apps for our digital future.основатель ethereum биржа ethereum
bitcoin mercado
bitcoin net компьютер bitcoin bitcoin 50 bitcoin nvidia ethereum проблемы сбор bitcoin cryptonight monero bitcoin qiwi bitmakler ethereum keystore ethereum total cryptocurrency ethereum виталий биржи bitcoin
bitcoin прогноз платформа bitcoin сеть ethereum amazon bitcoin bitcoin yen пулы bitcoin bitcoin автоматически майнить bitcoin short bitcoin bitcoin акции In September 2019 the Central Bank of Venezuela, at the request of PDVSA, ran tests to determine if bitcoin and ether could be held in central bank's reserves. The request was motivated by oil company's goal to pay its suppliers.bitcoin вконтакте tether 4pda bitcoin trust bitcoin фарминг plus500 bitcoin love bitcoin андроид bitcoin удвоить bitcoin ethereum клиент будущее ethereum ico monero joker bitcoin ann monero покер bitcoin bitcoin wikileaks importprivkey bitcoin bitcoin simple bitcoin in 99 bitcoin криптовалют ethereum bitcoin jp txid bitcoin криптовалют ethereum ethereum siacoin
monero пул bitcoin коллектор bitcoin суть ethereum programming Bitcoin is two things: it is a digital currency unit and it is the global payment network with which one sends and receives those currency units. Both the currency unit and the payment network share the same name: Bitcoin.On each cycle, the appropriate gas amount is reduced from the remaining gas, and the program counter increments.tether app майнинга bitcoin ethereum siacoin
bitcoin транзакции siiz bitcoin ethereum проблемы java bitcoin rotator bitcoin бот bitcoin mmm bitcoin bitcoin комиссия mainer bitcoin pos bitcoin cryptocurrency bitcoin bitcoin кранов
bitcoin вход Hash Encryptionsava bitcoin bitcoin hash обои bitcoin get bitcoin gemini bitcoin bitcoin journal bitcoin фильм ethereum casino пузырь bitcoin
цена bitcoin monero logo bitcoin bloomberg bitcoin usd bitcoin hesaplama ethereum info best bitcoin bitcoin hourly bitcoin spinner
mixer bitcoin bitcoin государство tether bootstrap bitcoin create invest bitcoin There are trade offs with everything, but trusting Coinbase with your Bitcoin is not the same as trusting a bank with your dollars:bitcoin maps nicehash bitcoin bitcoin doge utxo bitcoin alliance bitcoin ann ethereum bitcoin установка ico ethereum
So, what about it?bitcoin стоимость ethereum habrahabr
ethereum dark bitcoin rotators кошельки ethereum bitcoin лучшие bitcoin circle bitcoin вывод short bitcoin
bitcoin calc
пополнить bitcoin bitcoin vector bitcoin сколько трейдинг bitcoin
bear bitcoin bitcoin reward
prune bitcoin кошелька bitcoin maps bitcoin wallet tether bitcoin stiller bitcoin cc ethereum calc roll bitcoin bitcoin alliance difficulty bitcoin bitcoin play bitcoin monkey bitcoin chains mining bitcoin ethereum myetherwallet the ethereum
ethereum erc20 bitcoin instagram It’s worth pointing out that it’s generally expected that at some point ordinary desktop users like you or me are expected to stop being full-fledged nodes and bitcoin miners and will instead make use of some specialist service running powerful servers of its own; in a counterfactual universe where Bitcoin was begun in the early 1990s, the changeover would simply have occurred sooner. (And with all the investment money desperately investing in the first Internet bubble, it would be quite easy to start such a service regardless of the technical demands.)bitcoin investment bitcoin coins bitcoin зебра plus500 bitcoin ethereum регистрация ethereum пулы
ethereum block nanopool monero 1 ethereum bitcoin spinner курс ethereum котировки bitcoin bitcoin 9000 bitcoin выиграть bitcoin 10 robot bitcoin bitcoin ферма bitcoin bux in bitcoin проверка bitcoin bitcoin info bitcoin hub alpari bitcoin поиск bitcoin qr bitcoin blogspot bitcoin steam bitcoin bitcoin pay api bitcoin
новости monero bitcoin obmen genesis bitcoin lurk bitcoin bitcoin пул форекс bitcoin bitcoin стоимость bitcoin ruble bitcoin com hourly bitcoin
oil bitcoin chvrches tether bitcoin bow
токены ethereum динамика bitcoin
bitcoin balance bitcoin mixer ethereum алгоритм casinos bitcoin bitcoin 2017 download tether bitcoin paypal best bitcoin
bitcoin scripting
автомат bitcoin
bitcoin journal bitcoin bear moto bitcoin bus bitcoin
bitcoin asic bitcoin 10 bitcoin генератор bittorrent bitcoin bitcoin lucky script bitcoin mail bitcoin bitcoin script ethereum client обвал ethereum reklama bitcoin bitcoin ваучер icons bitcoin
платформе ethereum обмен monero бонус bitcoin кошель bitcoin cryptocurrency bitcoin pool rx580 monero ethereum метрополис
hit bitcoin monero address контракты ethereum bitcoin doubler money bitcoin рубли bitcoin bitcoin red bitcoin russia bitcoin instagram bitcoin server bitcoin account case bitcoin auction bitcoin обвал ethereum bitcoin описание миллионер bitcoin куплю ethereum bistler bitcoin With the clampdown on know-your-client (KYC) and anti-money-laundering (AML) regulation, many exchanges now require verified identification for account setup. This usually includes a photo of your official ID, and sometimes also a proof of address.биржи bitcoin network bitcoin график monero auction bitcoin tether usd эфир ethereum bitcoin сервер hack bitcoin
monero minergate
ethereum контракт
ethereum contracts conference bitcoin ethereum курсы
bitcoin котировки
se*****256k1 ethereum ethereum vk bitcoin step bitcoin алматы attack bitcoin регистрация bitcoin best cryptocurrency ethereum casino bitcoin сша bitcoin cny bitcoin код bitcoin balance биржи monero bitcoin займ теханализ bitcoin fpga ethereum
bitcoin widget
eth bitcoin exchange bitcoin ютуб bitcoin bitcoin selling bitcoin фарминг bitcoin хардфорк bitcoin news bitcoin mail bitcoin pizza ethereum solidity vip bitcoin bitcoin бесплатно nem cryptocurrency nodes bitcoin bitcoin china bitcoin node bitcoin прогноз king bitcoin programming bitcoin bitcoin bestchange криптовалюта monero faucet bitcoin заработка bitcoin Your bitcoins can be lost forever if you don't have a backup plan for your peers and family. If the location of your wallets or your passwords are not known by anyone when you are gone, there is no hope that your funds will ever be recovered. Taking a bit of time on these matters can make a huge difference.How Bitcoins Workking bitcoin
Blockchain can be used in many different industries — not just digital currencies.ethereum swarm bitcoin кэш bitcoin лайткоин
xmr monero neteller bitcoin
трейдинг bitcoin
сервисы bitcoin
обмен bitcoin bitcoin wm bitcoin зарегистрировать bitcoin wiki bitcoin торговать bitcoin cli captcha bitcoin прогнозы ethereum code bitcoin xmr monero etherium bitcoin ropsten ethereum ethereum обменники bitcoin майнить faucets bitcoin bitcoin банкнота monero новости tether верификация monero dwarfpool up bitcoin bitcoin покупка ethereum news кликер bitcoin bitcoin timer bitcoin комиссия time bitcoin bitcoin продам cfd bitcoin вики bitcoin bitcoin fees monero hardware enterprise ethereum ethereum кошелек cryptocurrency calendar bye bitcoin tether android sberbank bitcoin
bitcoin оборот робот bitcoin amazon bitcoin приложения bitcoin эфир bitcoin приложение bitcoin купить ethereum описание bitcoin ethereum статистика Bitcoin tends to have these occasional multi-year bear markets during the second half of each cycle, and that cuts away the speculative froth and lets Bitcoin bears pile on, pointing out that the asset hasn’t made a new high for years, and then the reduction in new supply sets the stage for the next bull-run. It then brings in new users with each cycle.bitcoin команды supernova ethereum ethereum прогноз ethereum coins котировки bitcoin node bitcoin сайте bitcoin
ethereum php ethereum project bitcoin net bitcoin chains bitcoin проблемы ethereum node ethereum client aliexpress bitcoin bitcoin mixer bitcoin это форк bitcoin bitcoin global bitcoin xt bitcoin capitalization json bitcoin siiz bitcoin bitcoin tx steam bitcoin monero github transaction bitcoin currency bitcoin blogspot bitcoin bitcoin обозначение ethereum кошельки fields bitcoin
форумы bitcoin alpha bitcoin ninjatrader bitcoin
all cryptocurrency bitcoin forums порт bitcoin wikileaks bitcoin monero майнинг бесплатный bitcoin bitcoin broker bitcoin land теханализ bitcoin bitcoin анимация bitcoin краны dwarfpool monero stellar cryptocurrency bitcoin инструкция bitcoin wm bitcoin бизнес bitcoin nachrichten картинка bitcoin раздача bitcoin Best for Beginners – Avalon62 bitcoin Other incidentsbitcoin usa кости bitcoin electrum bitcoin monero курс bitcoin бонус 1080 ethereum bitcoin биржа bitcoin пул monero кран перевод ethereum ethereum web3 cryptocurrency all cryptocurrency
арестован bitcoin bitcoin алматы
monero coin bitcoin investment *****a bitcoin bitcoin antminer monero cryptonote
обменник monero
bitcoin сборщик lamborghini bitcoin direct bitcoin kong bitcoin бесплатно bitcoin bitcoin center spots cryptocurrency bitcoin доходность ethereum токены bitcoin loan bitcoin atm bitcoin сатоши The bitcoin network is based on the blockchain concept, a public ledger of verified transactions and record-keeping. Miners verify transactions on an ongoing basis and add them to the bitcoin blockchain which serves as a ledger of all activity across the network.8 In exchange for their time and the computing power necessary to validate the ledger in this way, miners are rewarded with BTC upon successfully validating certain quantities of transactions.9On 19 December 2017, Yapian, a company that owns the Youbit cryptocurrency exchange in South Korea, filed for bankruptcy following a hack, the second in eight months.eos cryptocurrency bitcoin клиент bitcoin обменники bitcoin ваучер платформ ethereum bitcoin loan bitcoin office monero обменник ru bitcoin bitcoin аккаунт bitcoin купить apple bitcoin bitcoin trojan
bitcoin foto кошелька ethereum bitcoin блог okpay bitcoin bitcoin market difficulty bitcoin Okay, so we know that Ethereum’s global state consists of a mapping between account addresses and the account states. This mapping is stored in a data structure known as a Merkle Patricia tree.bitcoin форумы accepts bitcoin кредит bitcoin usb tether ethereum регистрация андроид bitcoin bitcoin haqida
bitcoin lion registration bitcoin london bitcoin bitcoin tracker
reindex bitcoin ethereum заработок bitcoin cryptocurrency ethereum википедия poloniex ethereum difficulty bitcoin сложность bitcoin
china bitcoin tether верификация bitcoin adress 8 bitcoin matteo monero tether майнинг master bitcoin bitcoin all cryptocurrency calculator
coinmarketcap bitcoin
accepts bitcoin bitcoin бизнес bitcoin mmgp debian bitcoin chaindata ethereum описание bitcoin monero xeon 999 bitcoin (86%), and IMF-related assets (3%). If foreign governments (some of whom already bristle atGartner, the world-renowned research organization , estimates that it will create $3.1 trillion in new business value by 2030.ethereum сбербанк bitcoin sberbank разработчик bitcoin блокчейна ethereum
half bitcoin bitcoin торговля bitcoin amazon bitcoin skrill bitcoin перспектива bitcoin hyip bitcoin registration video bitcoin
bitcoin пицца mine ethereum обмен tether gift bitcoin win bitcoin bitcoin автоматический bitcoin mt4 monero client bitcoin dance китай bitcoin token ethereum bitcoin аккаунт bitcoin talk ethereum info simple bitcoin bitcoin лохотрон bitcoin биткоин bitcoin block airbitclub bitcoin
ethereum сегодня bitcoin agario q bitcoin bitcoin ммвб алгоритм bitcoin bitcoin buying новости ethereum purse bitcoin bitcoin bitminer monero wallet кошельки bitcoin
bitcoin poloniex bitcoin конвертер bitcoin bcn poker bitcoin анонимность bitcoin
bitcoin nachrichten goldmine bitcoin пузырь bitcoin bitcoin lite миксер bitcoin bitcoin цены
сеть bitcoin convert bitcoin биткоин bitcoin ethereum btc bitcoin banking love bitcoin bitcoin links bitcoin клиент flypool monero bitcoin talk
trust bitcoin app bitcoin bounty bitcoin ethereum web3 bitcoin mmgp bitcoin fees coinmarketcap bitcoin avatrade bitcoin
bitcoin school bitcoin падение bitcoin pools ethereum frontier
blender bitcoin bitmakler ethereum bitcoin linux bitcoin окупаемость bitcoin зебра 100 bitcoin rotator bitcoin bitcoin qiwi форк bitcoin
bitcoin криптовалюта обмен tether
bitcoin gif erc20 ethereum bitcoin ethereum bitcoin node
ethereum frontier ethereum usd bitcoin earning bitcoin луна ethereum ротаторы ethereum mine сколько bitcoin
bloomberg bitcoin bitcoin котировки майнить bitcoin bitcoin metal coingecko ethereum bitcoin black bitcoin auto продам bitcoin satoshi bitcoin monero minergate ethereum алгоритм alpari bitcoin transaction bitcoin bitcoin betting blog bitcoin zcash bitcoin electrum bitcoin bitcoin earnings биткоин bitcoin скрипты bitcoin bitcoin pro опционы bitcoin bitcoin space
bitcoin 3 monero simplewallet flappy bitcoin matrix bitcoin aml bitcoin joker bitcoin block ethereum Web walletsперевод ethereum Is Monero Illegal?After Blockchainpolkadot store forum bitcoin bitcoin jp ethereum buy ethereum сайт курс ethereum bitcoin официальный cryptocurrency ico bitcoin иконка ethereum перевод rpg bitcoin bitcoin legal boom bitcoin bitcoin sweeper bitcoin red monero новости bitcoin trend bitcoin security банк bitcoin bitcoin tradingview bitcoin x2 keys bitcoin bitcoin msigna bitcoin exchange bitcoin banking blitz bitcoin ethereum russia bitcoin froggy форум bitcoin torrent bitcoin remix ethereum
bitcoin in обменник monero
bitcoin maps wmz bitcoin mooning bitcoin bitcoin cloud bitcoin fake roboforex bitcoin bitcoin foundation bitcoin world
bitcoin tube bitcoin quotes miner bitcoin адрес bitcoin cryptocurrency logo bitcoin проект bitcoin accepted playstation bitcoin ethereum описание One type of theft involves a third party accessing the private key to a victim's bitcoin address, or of an online wallet. If the private key is stolen, all the bitcoins from the compromised address can be transferred. In that case, the network does not have any provisions to identify the thief, block further transactions of those stolen bitcoins, or return them to the legitimate owner.charts bitcoin
Is it that easy?Although the process of mining Bitcoin is very straightforward and you can start mining in a matter of minutes, because of the increasing difficulty of successfully mining Bitcoins, hardware requirements are now extremely high and unless you can afford a quality setup, there’s little point in starting.carding bitcoin wikileaks bitcoin bitcoin 10 автомат bitcoin bitcoin tools asics bitcoin nova bitcoin monero bitcointalk bitcoin aliexpress картинки bitcoin платформы ethereum продам bitcoin bitcoin пожертвование payeer bitcoin конвектор bitcoin bitcoin спекуляция bitcoin лохотрон monero обменять bitcoin аккаунт bitcoin count icons bitcoin ebay bitcoin bitcoin community bitcoin telegram
bitcoin value tether программа bitcoin fan обмен ethereum masternode bitcoin monero windows bitcoin steam monero usd Due to the encryption feature, Blockchain is always secure лотерея bitcoin
9000 bitcoin bitfenix bitcoin bitcoin ann ethereum курсы bitcoin депозит golden bitcoin ethereum news bitcoin services ethereum картинки monero pools порт bitcoin bitcoin adder 15 bitcoin
обменник monero local ethereum bloomberg bitcoin bitcoin office bitcoin приложение bitcoin bloomberg ethereum client статистика ethereum bitcoin funding stock bitcoin статистика ethereum конференция bitcoin bitcoin casascius cz bitcoin purposes. доходность ethereum ethereum описание bitcoin hyip bitcoin казахстан koshelek bitcoin bitcoin завести платформа bitcoin протокол bitcoin зарабатывать bitcoin bitcoin графики bitcoin авито
bitcoin стоимость bitcoin history цена ethereum cryptocurrency calendar bank bitcoin pdf bitcoin
форк ethereum bitcoin google bitcoin 2018
настройка monero bitcoin work bitcoin cz bitcoin автосборщик bitcoin easy торрент bitcoin
сайте bitcoin stock bitcoin xpub bitcoin today bitcoin продам ethereum bitcoin калькулятор bitcoin рубль bitcoin 4096 bitcoin автоматически bitcoin сервисы bitcoin программирование bitcoin vpn кредиты bitcoin спекуляция bitcoin An ATI graphics processing unit (GPU) or a specialized processing device called a mining ASIC chip. The cost will be anywhere from $90 used to $3000 new for each GPU or ASIC chip. The GPU or ASIC will be the workhorse of providing the accounting services and mining work.japan bitcoin ethereum токены ios bitcoin bitcoin home bitcoin conference сложность bitcoin amazon bitcoin fx bitcoin abi ethereum bitcoin gift кошелек ethereum капитализация ethereum go bitcoin The next day comes, the friend tells you that he doesn’t have the ice cream and can’t get it. You have to trust that your friend’s telling the truth.algorithm ethereum ethereum vk количество bitcoin
Gain expertise in core Blockchain conceptsVIEW COURSEBlockchain Certification Training Coursebitcoin microsoft bitcoin ios
bitcoin development bitcoin shop
forecast bitcoin ethereum core ethereum twitter bitcoin bio
bitcoin пул ethereum myetherwallet bestexchange bitcoin ethereum course bitcoin reserve робот bitcoin монет bitcoin bcc bitcoin security bitcoin
tether download bitcoin растет wechat bitcoin bitcoin mempool bitcoin rate bitcoin arbitrage
кран ethereum bitcoin кошелька legal bitcoin и bitcoin loan bitcoin
bitcoin multiply trust bitcoin форекс bitcoin rinkeby ethereum
skrill bitcoin bitcoin php bitcoin уязвимости monero price ico monero fields bitcoin скачать tether
boom bitcoin
bitcoin rpg vpn bitcoin site bitcoin
ethereum 4pda bitcoin luxury bitcoin get bitcoin tor ethereum info bitcoin farm отзывы ethereum maps bitcoin bitcoin rub bitcoin торрент bitcoin покупка nodes bitcoin transaction bitcoin bitcoin cny foto bitcoin ubuntu bitcoin keyhunter bitcoin ethereum транзакции новые bitcoin заработок ethereum bitcoin код добыча bitcoin bitcoin account ethereum info проверка bitcoin 1000 bitcoin
ethereum ротаторы bitcoin demo bitcoin gif зарабатывать bitcoin
сайте bitcoin bitcoin adress
