What companies accept ethereum

What companies accept ethereum

Jan 19, 2018 big online retailer to start accepting bitcoins in January of 2014. The company allows its customers to pay for everything from laptops and television sets to throw pillows and ottomans with bitcoins. In fact, allows customers to use all the major cryptocurrencies, including Ethereum, Litecoin, Nov 9, 2017 Today, the process of purchasing cryptocurrencies (like Bitcoin and Ethereum) is cumbersome and difficult. 75 Places to Spend Your Bitcoins - Shopify Who Accepts Bitcoins As Payment? List of Companies Who accept bitcoins as payment? Bitcoins are taking over the crypto-currency marketplace. Apr 7, 2016 DigixGlobal is an asset tokenization platform built on the Ethereum blockchain that aims to marry the functionality and transactional utility of cryptocurrencies with real world physical assets. On DigixGlobal, one Digix Gold token represents a one-gram share of a physical gold bar. Users can redeem their  Feb 27, 2017 JPMorgan Chase & Co (JPM.N), Microsoft Corp (MSFT.O), Intel Corp (INTC.O) and more than two dozen other companies have teamed up to develop standards and technology to make it easier for enterprises to use blockchain code Ethereum in the latest push by large firms to move toward distributed 

Microsoft, Intel, banks form Enterprise Ethereum blockchain alliance

Aug 8, 2017 Online retail giant Overstock has partnered with blockchain startup ShapeShift to accept more than 60 cryptocurrencies as payment at its online stores. With the But whether the company believes this trend will continue remains unclear. Notably UNICEF's Venture Arm Trials Ethereum Smart Contracts Ethereum logistics - ISH Communications Buy Bitcoin/Ethereum In Sweden - Coinbase ethereum metropolis update Spending Bitcoin and any other digital currency shouldn't be limited and restricted only to a certain online stores accepting it. That should be really hassle free experience available in any online store worldwide, like the credit card payments are nowadays. Find the product you want to buy & enter it's link on our site. 1.Oct 23, 2017 However, Ethereum, which is arguably more coveted for its blockchain technology than bitcoin, hasn't had as much luck attracting merchants as a form of payment. In fact, until recently there weren't any brand-name businesses that accepted ether, the digital currency of Ethereum, as a form of payment.

Favored, Inc. (OTC: FVRD) Announces Development on Ethereum Eight Things Cryptocurrency Enthusiasts Probably Won't Tell You Nov 17, 2017 Major credit card tech companies, like Stripe and Braintree, enable developers to accept cryptocurrencies as easily as accepting credit cards. Not only is the process of implementing Bitcoin and Ethereum payments simple, Stripe and Braintree also service a grand majority of online tech companies that  nicholas spencer eth Sep 24, 2017 I'd be stunned if they don't, because they can't just cede that part of the market to us, if we're the only main, large retail site accepting Bitcoin.” This trend has been followed by many companies. It started with Overstock's acceptance of Bitcoin's to include other enterprise-level tech companies. Recent Australia Bound? Brisbane Airport Accepts Cryptocurrencies in a World-First. January 18, 2018 09: Dallas Mavericks to Accept Bitcoin 'Next Season,' Says Owner Mark Cuban · KFC Canada Fried Chicken Ukrainian Shipping Company Accepts Bitcoin for Faster, Sanctions-Free Global Trade. November 19, 2017 14:07 

Mar 6, 2017 In a recent blog post, Microsoft announced their participation in the newly formed Enterprise Ethereum Alliance. Joining them are also companies such as Intel, J.P. Morgan, BNY Mellon, BP, ING, Thomson Reuters and blockchain startups. The mission for this alliance is to: Learn from and build upon the SurfAir Becomes First Airline To Accept Bitcoin And Ethereum Aug 15, 2017 The Ethereum blockchain consortium believes this working group will serve as a base for the success of “various efforts taking place within the organization.” “We are thrilled to see robust interest in blockchain technology by forward-looking law firms and institutions. Lawyers are poised to serve as the  what is the difference between bitcoin and paypal Jan 23, 2017 Nevertheless, Bitcoin grew in popularity and other organizations and merchants took Wikileak's lead and began accepting Bitcoin. The places where you can use Bitcoin these days ranges from small businesses to multi-billion dollar companies,to shady deepweb markets. Not only was Bitcoin revolutionary Hillsdale, SydneyAccepted Crypto Coins: Bitcoin, Ethereum. OptimOz. is about eliminating performance robbing elements from your lifestyle. These could be chemical, physical or emotional stressors that affect your resilience and ability to affect positive change or achieve your goals. For instance, we help 

Jul 27, 2017 The more businesses and countries that accept cryptocurrencies as legal tender, the more legitimate they become. Finally, investors are putting their faith in the technology behind cryptocurrencies such as bitcoin and ethereum. The broad belief is that their blockchain-based technology -- essentially a Sep 1, 2017 Imagine what the internet did for communication and the exchange of information. Now picture that kind of sweeping change to the world of money; that sort of ease and transparency applied to banking, stock markets and the ability of companies to raise money. As Alex Tapscott tells Day 6 guest host Peter  Jul 21, 2016 It is always good to see more websites focusing on making Bitcoin shopping more convenient. Albeit there are a few of these sites available already, more competition is never a bad thing. Shopawl was launched recently, and the company seems to focus its attention on people who shop in China on a  mist ethereum Dec 12, 2017 Ethereum has risen more than 6,100 percent this year to $636.49, while Litecoin has soared more than 9,000 percent. A growing number of companies also are raising funds through "initial coin offerings," or ICOs, complete with celebrity endorsements ranging from boxing legend Floyd Mayweather to ERC223 token standard · Issue #223 · ethereum/EIPs · GitHub

Mar 2, 2017 Major investment banks as well as several other Fortune 500 companies joined an effort to develop blockchain technology for use in reducing inefficiencies in financial interactions Tuesday. Called the Ethereum Enterprise Alliance, companies including J.P. Morgan, Credit Suisse, Accenture and UBS Nov 2, 2017 Amazon has bought a trio of domain names related to cryptocurrencies and blockchain technology amidst rumors it will soon accept Bitcoin. That said Initially, one may think the retailer is preparing to reveal something related to Ethereum and Ether tokens, or that it's about to launch its own crytocurrency. Aug 29, 2017 Learn how to accept Ethereum for payments with Shopify. Ethereum has become a popular payment method - also known as ETH or Ether - accept it now on Shopify. Joe Dempsey is Head of Design with Liquify Web Design Company London and a leading Shopify Developer. He specialises in Shopify  ethereum confido Ethereum potential 2017 - ArenaAug 12, 2017 Microsoft, the $561 bln US-based technology company, has released the Confidential Consortium (Coco) Framework, an Ethereum-based protocol which commercial companies and large-scale organizations will be able to utilize to process information on the Ethereum Blockchain with increased privacy.

Marathon Money - Bitcoin, Litecoin, Ethereum, Cryptocurrency Oct 11, 2017 There's little doubt that if Amazon were to accept Bitcoin directly it would legitimize the currency. Many Bitcoin users see Amazon as the Holy Grail, and believe that the floodgates would open from retailers if Amazon led the way. James Altucher, the American hedge fund manager and venture capitalist,  Ethereum for windows 7 - Flamingdon coinmarketcap com ethereum “Initial Coin Offering”: Ethereum To The Rescue? - NewsonomicsOraclize joins the Enterprise Ethereum Alliance – Oraclize

Here's a really simplistic contract to give you some ideas. I would suggest playing with it in Browser Solidity. It records an order using orderNumber to identify them. orderNumber is presumed to come from order processing outside of the contract it's a reference you can use to see how much Eth was sent In this article about 10 companies and businesses that accept ethereum, you will find the answers to what ethereum is, which companies accept digital currencies like bitcoin and litecoin, and (most importantly for some) if anything can be purchased on Amazon with them. There are two types of readers of this article: those  Ethereum oracle api david seaman ethereum Aug 31, 2015 If you accept bitcoin as a currency you are implicitly accepting a broader definition of money than has ever existed before. This is because bitcoin is not just a digital store of value, it's a simultaneous digital payment system. If you accept Ethereum as money, you are accepting an even broader definition than People who were opposed to the hard fork decided to stick with the original chain calling it Ethereum Classic. What is Ethereum Classic?

Oct 31, 2017 One company is helping schools in South Africa collect government funds. Another is trying to bring cheaper electricity to Texas residents.May 31, 2017 The goal is not a definitive list, but I will be adding Canadian businesses that accept Bitcoin. If you know a website of a business accepting Bitcoin that's missing, please provide the following in a comment: Their website; What they sell *You can also pay with Bitcoin, Ethereum, Litecoin or Bitcoin Cash* Enterprise Ethereum Alliance (EEA) Plants the Seeds of Enterprise sell bitcoin for gold Ethereum buy or sell - J.R.'s Sportsbar & GrillEthereum Mining Guide - for all Operating Systems - BestVPN.com

Microsoft Goes Ethereum: $561 Bln US Company Releases

I don't really think that there are many places you can buy this with ether. Most people use ether to do something like gamble, there are a number of sites that take stakes in ether, or to invest in ICOs. It seems bitcoin and liteCoin are accepted in more places. If you want to buy goods then the best way would be to exchange Apr 4, 2017 OCTAGON Strategy, a Hong Kong-based commodities and digital assets trading house, takes a huge step into the world of cryptocurrencies when they announced last Friday they would formally commence trading Ethereum on its OTC trading desk. Ethereum is a fairly new cryptocurrency on the scene  Ethereum mining tips - Bitcoin Cloud Mining Services | Earn on Bitcoin ethereum classic hashrate Ethereum buy or sell - Rexburg HousingWho Accepts Ethereum – LarkTrail – Crypto-Currency Trading

This Dark Web Market is Planning to Add Support for Ethereum Cryptocurrency Report covering Blockchain, Bitcoin, and Ethereum Jan 13, 2018 They could have easily tweeted about the potential that their platform has or the fact that dozens of companies have joined the Enterprise Ethereum Alliance (oddly enough, JPMorgan is one of them, despite its CEO having an Bitcoin Lawyer: Law Firms are Accepting Cryptocurrency as Payment. turbo bitcoin faucet Mar 25, 2017 Companies and entrepreneurs all over the world are looking at blockchain technology to create new business models. Some of these projects rely on the bitcoin blockchain, whereas others seemingly favor Ethereum. Both distributed ledgers offer quite a few advantages. As a result, various companies and Online payment processing for internet businesses. Stripe is a suite of payment APIs that powers commerce for businesses of all sizes.

Ethereum sell or buy - Driving Test TipsJun 13, 2017 Further, Australia declared that it will accept bitcoins as a legal currency from July 2017, while Russia is planning to adopt bitcoin as a legal payment method in 2018. The company believes that closer to home, the demand for bitcoins in India is rising exponentially with Indians actively exploring bitcoins as  May 11, 2017 Ethereum cripto currency chrystal art icon for apps and websites. Ethereum vector logo for print While those trading Bitcoin rejoiced over its price peaks, the darknet market AlphaBay recently announced it would begin accepting Ether, the cryptocurrency more popularly known as Ethereum or ETH. ethereum address for sale Jan 10, 2018 Blockchain-based supply chain tech company joins organization with mission to increase the adoption of Ethereum-based enterprise solutions - ICO starting next By being accepted by the EEA, OriginTrail further solidifies itself as an enterprise-grade software capable of handling one of the most complex, SelfKey Self-Sovereign Identity Network

Nov 11, 2015 This, according to Gray, inspired the creation of Ethereum Blockchain as a Service, allowing companies to begin working with the technology without having to first make significant investments in hardware. This isn't Microsoft's first move towards legitimising cryptocurrency -- it began accepting payments in Oct 19, 2017 With news of Bitcoin hitting an all-time high of $5,829 last week, the cryptocurrency world looks like a good bet for businesses. Bitcoin has grown 500 percent in 2017, and other cryptocurrencies like Ethereum continue to rise in value. Plenty of businesses and individuals have begun to accept Bitcoins as  Aug 8, 2017 Adopting these currencies, which have proven to be popular trading vehicles on crypto- exchanges , is another bold move by the company that boasts being the first major retailer to accept bitcoin. In addition, has a history of innovating with blockchain technology and was the first publically  mercury protocol ethereum PayPal was one of the first payment companies to enable merchants to accept Bitcoin through Braintree, by way of partnerships with payment processors BitPay, We are also exploring Hyperledger (created to advance cross-industry blockchain technologies), Ethereum (a decentralized platform that runs smart contracts), Payment gateway providing buy now buttons, shopping carts, and more to accept Bitcoin, Litecoin, and other cryptocurrencies/altcoins on your website/online store.

Dec 20, 2016 The ShapeShift Shifty Button provides websites the option of accepting dozens of leading digital currencies by generating an easy-to-implement snippet of code. The Button's code is free and open source and has been integrated by dozens of bitcoin-friendly merchants to broaden customer payment needs Oct 19, 2016 BitPay provides a payment platform and the capability that allows businesses to accept Bitcoin payments and provides a way to then deposit those to a bank account. BitPay provides ConsenSys. ConsenSys is a venture production studio that builds decentralized applications on the Ethereum blockchain. Aug 15, 2017 According to a LocalCoinATM press release, the company added ethereum support to six existing bitcoin ATMs in the Toronto area on Thursday. uses beyond being playthings for speculators, and in Canada's most populous city, there's only a handful of locations that accept cryptocurrency as payment. vontobel bitcoin certificate Ethereum's 5001% Price Rise Explained | Bitcoin InsiderEthereum as a Common Economy , Sydney - 1.21GWs

Ethereum wallet gui - Iron House CrossFitJan 5, 2018 Cryptocurrencies may not be legal tender in Malaysia yet, but that did not stop a car dealer in Seri Kembangan, Selangor from offering customers the option to pay with Bitcoin and Ethereum. 397f Image via   Dec 1, 2017 Bitcoin is accepted in a number of major retailers, including travel agents, spaceflights from Virgin Galactic and gaming stores like Steam and Micros zulutrade bitcoin I know lots of places accept bitcoin and the number of merchants are growing everyday. If you have trouble with ether, it might be an idea to exchange it into bitcoin so that you can easily use it as an everyday currency. I'm not sure if anyone is accepting ether yet, but it's fast growing so hopefully soon it will Ethereum Homestead Documentation - Read the Docs

100+ Companies That Accept Bitcoins As Payment | eBay

Oct 18, 2017 NEW YORK, Oct. 18, 2017 /PRNewswire/ -- Stayawhile, a startup building a global network of furnished designer apartments, announced today that they have begun accepting digital currencies Bitcoin and Ethereum for rent payments. The company is among the first in the real estate industry to accept Sell ethereum paypal Mar 1, 2017 30 the largest companies from sectors including tech and finance have joined to form an alliance to allow easier use of the blockchain enterprise code Ethereum. Blockchain is no longer the outsider technology driving bitcoin. It is the technology that could define the future of the financial world, and almost  eth english courses Competition Tether USD on Ethereum - The Barn and Pinn CottageWhether you're interested in Bitcoin, Ethereum, Litecoin, Ripple or any other cryptocurrency, it is important to work with a company or custodian that has a successful track . The main issue with that is that many wallets are not accepting business customers, and those that will will either take weeks to respond or will place 

Jul 1, 2017 Experts call for caution about digital currencies, such as bitcoin and Ethereum, but financial firms are considering adopting them or even establishing their own.Ethereum command line options - MG Versicherungsmakler GmbH Ethereum gold coin - MOVILOCKERS msi gtx 1060 ethereum hashrate Jul 16, 2017 Stores which accept payment in Bitcoin are detailed on Luno's blog and include Takealot, Raru, PiShop, FirstShop, and more. Ethereum is not widely supported for payment in South Africa, however, due to the lack of local cryptocurrency exchanges which support the blockchain. Bitcoin is still the most The Bitclub Guide - Have your Bitcoins questions answered

Jan 16, 2018 Houston-based TapJets, which allows customers to instantly book a private jet with their smartphone, is accepting payment in Bitcoin and Ethereum. The company began accepting Bitcoin in July 2017, and the number of flights booked using that cryptocurrency tripled month over month. The company Jun 28, 2017 But it's a gamble, in more ways than one. Not only for the holders of Ether, whose value fluctuates, just like gold, as the demand for the currency rises and falls. But also those businesses built are on the Ethereum blockchain. As firms on Ethereum can only accept Ether, confidence in the currency is crucial. Jan 14, 2018 Who accepts bitcoins? Many companies are accepting bitcoins, many are not. Here is a list of the biggest names accepting bitcoins as a currency. buy ethereum on poloniex Like many online retailers, currently only allows us to use existing fiat currencies for payments. This is bad both for consumers (you and I) and for for a number of reasons described below. To fix these issues, should lead e-commerce merchants by embracing the use of the Ethereum Jan 29, 2017 From Boom to Whimper – Where are the Bitcoin merchants and can Ethereum revive cryptocurrency payments? claims that over 100,000 merchants accept bitcoin, but most of who they list appear to be companies that don't and never have accepted bitcoin (e.g. amazon, 

May 23, 2017 Corporate support for the Enterprise Ethereum Alliance (EEA) is growing after 86 firms including State Street, Toyota, Merck, ING, Broadridge and Rabobank joined the collective that is seeking to use blockchain technology to run smart contracts at Fortune 500 companies. Ethereum is an open-source, What is a Splitter Contract? – Bitcoin Isle Buy & Sell Bitcoin or Accept Bitcoin & Altcoins with our Merchant Payment Gateway on any online shop quick & easy. Get paid in EUR, USD or BTC. Sign up now! which exchanges support bitcoin cash Dec 8, 2017 Surf Air, a California based airline company, announced on December 5, 2017, that it would be accepting payments in bitcoin and ether, two of the most popular cryptocurrencies. The airline has become popular because of its monthly “all you can fly” membership in addition to its air charter services.Ethereum potential 2017

De 0 à 5000 % de R.O.I avec l'ETHEREUM ! BITCOIN et - 我的标题Jan 4, 2018 As for ethereum, the fork happened and ethereum kept on chugging away, became the de-facto platform for the ICO (initial coin offering) boom that . Evidence suggests that in 2018 that a growing number of larger retailers and service providers will accept bitcoin (and cryptocurrency in general) as  Jun 3, 2017 But today, the tech and entrepreneurial community has gotten their hands on blockchain and cryptocurrency with the creation of other coins and technology. And now cryptocurrencies such as Ethereum are being used and backed by the biggest companies in the world such as Microsoft, JP Morgan Chase  claymores dual ethereum v9 8 Jan 24, 2017 Do any Singaporean merchants actually accept Bitcoin payments? We're pleased to announce that Singapore has a bustling Bitcoin market, with more and more merchants accepting the digital currency as a payment method. Below is a list of places, both online and offline, where you can spend Bitcoin in Sep 14, 2017 And some people purchase Bitcoin as a means of investing in companies that raise money through an ICO, since equity in those companies cannot be purchased with traditional currency. You can only purchase tokens with Bitcoin or Ether, which is Ethereum's cryptocurrency. Ethereum. Ethereum is 

STEP 4: PAYMENT. Select your preferred Bitcoin payment option. If your digital wallet software is. Installed on your computer, click the "Pay with Bitcoin" button; Stored on your smartphone, scan the QR code to process the payment; Hosted on the web, click "View Address" link to display digital wallet address, then send the Monax | Blog | Why we're joining the Enterprise Ethereum Alliance Team - ConsenSys theymos bitcoin Mar 24, 2017 Ethereum is a decentralized application that supports a cryptocurrency, or digital currency, just like Bitcoin. You can pay for things online, trade money, and buy and sell anywhere that accepts it. But there's more to Ethereum than there is to Bitcoin. The cryptocurrency, called ether, runs on a "smart contract.Nov 27, 2017 Bitcoin and other increasingly valuable cryptocurrencies like Ethereum have brought huge rewards to investors and to companies that have launched Online, of course, it's easier to search for merchants that accept cryptocurrency, and some stores have attracted followings of digital cash enthusiasts.

Ethereum Capital launches $50 mln private offering, RTO - PE Hub

OpenReaktor#32 with I/O Ventures, Ethereum & TechSoup Jul 20, 2017 Around 12:00 PST, an unknown attacker exploited a critical flaw in the Parity multi-signature wallet on the Ethereum network, draining three massive wallets of The library is called in several places, via an EVM instruction called DELEGATECALL , which does the following: for whatever method that calls  Nov 7, 2017 cryptocurrencies. Mint, Bloomberg, Intuit, Zynga, Shopify, etc are some of the major sites which are accepting Bitcoin as payment method. However, with recent forks and the introduction of new cryptocurrencies like Ethereum, Monero, Ripple etc, retailers have more options in terms of currencies. check your ethereum balance Ethereum app for blackberry - İstanbul Proje YapıBlockchain: The Invisible Technology That's Changing the World

Synechron - Synechron Enters the Enterprise Ethereum AllianceJan 17, 2018 Welcome to Crypto Daily News, this news piece "Private Jet Company Now Accepting Bitcoin And Ethereum" is breaking news from the Crypto sector. Nov 13, 2017 The list of 25 big companies that accept Bitcoin, Ethereum and other cryptocurrencies consists of retailers, tech giants, fast food chains and many other companies that have jumped on the bandwagon as cryptocurrencies have gone mainstream. And it's a good thing, because given the popularity that  ethereum in 2017 Ethereum merchants - Herbert FisheriesMar 23, 2017 With these giant companies and successful entrepreneurs backing Ethereum, and only a handful of detractors, I will be a very interested observer to see what transpires for Ethereum in 2017 and beyond and how entrepreneurs continue to find ways to utilize the platform. Speaking of timing, there is an 

Oct 22, 2017 Despite being underwritten by the same technology, Ethereum has a far lower profile than the more popular Bitcoin – and this could help the new technology have a far greater impact. This is according to Monica Singer, former CEO of Strate, who has speaking in her new position as a Blockchain Business Bitcoin, Ethereum and what the future holds - 451 Research Here at ABACOHosting we're always adapting, growing and offering the latest and greatest technologies. After a lot of demand we have decided to accept Ethereum! Simply place your order and pay with Ethereum at checkout, Pay for Domain registrations, Web hosting, VPS's, Dedicated servers and Reseller hosting with  ethereum for beginners Mar 20, 2017 The Ethereum platform has received a lot of traction from legitimate businesses, mainly for its smart contracts capabilities. Many banking and financial institutions are already working on creating various applications built on the technology. The creation of Enterprise Ethereum Alliance recently is another Nov 2, 2017 The company has not made an announcement regarding the reason for the registrations, but it could be preparing to accept the currencies as payment or launching an exchange for customers to purchase them. Amazon's legal department is listed as the registrant for the .com domains amazonethereum, 

The above-mentioned cryptocurrency wallets offer the ability to purchase Ethereum and other cryptocurrencies in over 30 countries with easy to use steps in place. To create an account, visit their websites and hit register. The process requires personal details of the account holder, mobile number, email address, and other May 21, 2017 An effort to transform how businesses work by using blockchain technology added new members from multiple industries as Toyota Motor Corp., Merck KGaA, State Street Corp. and other companies joined industry group the Enterprise Ethereum Alliance. They join existing EEA members JPMorgan Chase  model, while it does help to increase security and validity, does have some negative effects. First, it does not give miners an incentive to collaborate and they don't have anything at stake which means there is no consequence for malicious activity (Janin, Ethereum For Investors Part. II, 2015). The second problem with  eth online Ethereum Archives - Toolbox for HRJan 4, 2018 Ethereum has become a popular cryptocurrency alternative to Bitcoin over the last year. However, unlike Bitcoin and rival currency Litecoin, Ethereum has been adopted by many companies and startups as a way to transact (and more). In the cryptocurrency wars, I like to view Ethereum like the diamond of 

Aug 15, 2017 Etherscan, an analytics platform for Ethereum, suggests there are nearly 5.5 million Ethereum accounts holding more than 93 million Ether. As a currency, Ether is accepted as payment by a number of web hosting companies and independent online businesses, and can be used with cryptocurrency “credit 3 days ago A number of cryptocurrencies have risen in popularity over the past 12 months with bitcoin, ripple, and ethereum all seeing surges. Since bitcoin was first It is the success of the mobile app that leads Mr Shultz to believe his company could become a world leader in accepting cryptocurrencies. He also  Jan 17, 2018 After seeing gains in the Bitcoin market, a Houston-based private jet company knew some people were flush with digital currency but lacked a way to spend it. TapJets, billed as the Uber for private jet travel, decided in early 2017 to jump into accepting Bitcoin as payment and started seeing results quickly. turkiye bitcoin Jan 4, 2018 Ethereum's market capitalization is only about a third of Bitcoin, but some think it is gaining ground fast.Dec 1, 2017 There's no denying that 2017 was great for cryptocurrencies. Bitcoin's skyrocketing price drove huge growth in the cryptocurrencies market. Reports from Forbes point out that many people believe that cryptocurrencies will find more space in the market next year. Which companies will be accepting bitcoin?