_ Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top up vote 5 down vote favorite 2 What are QR codes ?How do you use the QR code for payment function on the wallet ?When would you use it ?transactions wallet qrcode up vote 4 down vote When using bitcoin to pay at the point-of-sale or for a face-to-face transaction, there is the problem of how to communicate the Bitcoin address to be paid in a way that the person paying can use.A bitcoin address is just data, but it is between 27 and 34 characters so that is way to much info to expect the person paying to have to manually type in.A QR code can easily represent this amount of data in a machine-readable manner and do so reliably.The QR code can contain other information as well -- such as an amount and a message and other fields as well -- thanks to a URI scheme for Bitcoin.So with a mobile, a convenient way to pass that data is for the payment recipient (e.g., a merchant) to display a QR code with the Bitcoin address for the transaction, and then for the person paying to scan that QR code to obtain the bitcoin address.

A mobile app called Barcode scanner from ZXing is the most widely used app on Android for this.If you are paying using the Blockchain for Android mobile app, then that app will let you touch the QR code button to launch the Barcode scanner app.ethereum buy netherlandsWhen the scan is complete, the Bitcoin address field (and amount field if the QR code contained the amount) will then be populated with the data from the QR code.ethereum good investment redditThe person paying then hits send and the bitcoin transaction gets created and broadcasted by the mobile app.litecoin mining using gpu) can use a QR code as well, except the user may need manually do a paste of the clipboard contents after scanning.litecoin calculator price

The merchant or trader might use the same mobile app (e.g., Blockchain for Android) which has a built-in method to create and display the QR code for the customer to send payment to which occurs in just one step.bitcoin brightonMany clients (including Bitcoin-Qt), EWallets and payment processors such as BitPay and WalletBit will show a QR code (or a method to get the QR code displayed) for receiving payment.bitcoin qt guideFor those wishing to create a QR code manually can do so using a web-based service such as Wolfram Alpha or several other methods.wie entstehen bitcoinThis does introduce a vulnerability however in that the provider of the QR code could detect that this is a Bitcoin address and maliciously interject another address that the provider controls -- thus directing the consumer to pay the wrong address.bitcoin gator

So using only a trustworthy source to generate the QR codes is recommended.up vote 3 down vote Nowadays pretty much every device has a camera built in so it is much easier to scan the QR code rather than typing very long Bitcoin account address.doge coin buyersIf you have wallet in your mobile phone and you want to send money to someone he can email you the QR code and you will be able to scan it quickly with your phone and send the money.Without that you would have to type in on your phone the whole Bitcoin address.The same goes to receiving Bitcoins, you can easily send QR code to someone.If you make face to face transactions with Bitcoin you can exchange Bitcoin addresses just in few seconds, without typing./ or http://goqr.me/, after generating the code you can save it as a JPG file, print it and keep it in your wallet or even order a custom t-shirt so people can donate you some Bitcoins in the shopping centre just by pointing their cameras at you :D up vote 3 down vote As of November 2013, Bitcoin-qt generates a QR code.

Click the Addresses button at the top of the window, highlight the wallet address you want, and then click the "Show QR Code" button at the bottom of the window.Add a message, if you want, or not, and then click the "Save As" button.It will be saved as a PNG image file.up vote 1 down vote /qr and just fill in the address and maybe amount boxes and press "generate QR code".It also has an option to generate html code to embed on your site.The code is an image tag that references a php script so you can have javascript, asp, php etc change the amount and regenerate the "image".This also makes it ideal for adding in BB-code or other kinds of posts.Your Answer Sign up or log in Sign up using Google Sign up using Email and Password Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service.Browse other questions tagged transactions wallet qrcode or ask your own question.Where is my wallet address?

You can find your wallet address by navigating to the Addresses page or by clicking the Tools menu from the menu on the left.You'll see that you may have multiple addresses associated with your account - you can use any of these addresses for receiving bitcoin or ether, as long as it is the correct address type for the digital currency you wish to use.Don't be alarmed if you see addresses that you don't remember creating - we automatically generate a new address for every transaction and whenever we move funds between your wallet and our cold storage system.For more information on this, check out: Why did my wallet address change?Clicking the 'Details' button for an address will provide some additional information about that address and allow you to .From this view, you can see a QR code which can be scanned or embedded in your website.You can also sign a message with the address.Still can't find what you're looking for?You shouldn’t trust anyone with your bitcoins, and Case is well aware of that.

Over the past few years, Mt.Gox, Bitstamp and countless other centralized services have suffered serious security breaches.But Case is about to put an end to all this, as this startup has built one of the most secure hardware bitcoin wallets in the world.The startup is launching onstage today at Disrupt NY.“There’s no easy and secure way to use bitcoin.You’re either getting security, or you’re getting ease of use,” co-founder and CEO Melanie Shapiro told me.Case wants to provide both — security and ease of use.Case is a small credit card-shaped device with a tiny screen, a fingerprint sensor, a camera, a built-in GSM chip and a few buttons.Any time you want to make a bitcoin transaction, you press the bitcoin button, scan the QR code with the camera, swipe your finger and you’re done.Everything happens on the device; you don’t have to log in with a complicated password or use a smartphone app.You can even buy and sell bitcoins from this device.Behind the scenes, Case provides a highly secured multi-signature wallet.

You need two signatures to make a transaction.When you first start your Case device, you generate a private key on the device itself, and this key will stay on your device forever.“We don’t generate that private key — the device doesn’t come pre-populated with a private key,” Shapiro said.Case also stores a key in its encrypted online database.Transactions are only signed by the server if the fingerprint scan matches your biometric data.The small device communicates with these servers using its built-in GSM chip.Case works like the Kindle with 3G connectivity, meaning that you can use the device in more than a hundred countries around the world without having to pay for a subscription.But what if you lose your Case wallet?As you need two signatures to send bitcoins using Case, you won’t be able to recover your bitcoins.But fortunately the startup has a backup plan.It also stores a third key in an offline vault.You can retrieve this key after proving your identity to the company.

Case will cost $199 and will ship this summer after more than a year of hard work.The company is only starting to take pre-orders now.“We’ve seen a lot of hardware flops,” Shapiro said.“We wanted to be able to build the entire thing — the software, the firmware, the hardware.We are at that point now where we feel confident accepting pre-orders.” case4 case13 case12 case11 case10 case9 case8 case7 case6 case5 Judges: Noah Lichtenstein (Cowboy Ventures), Jessica Livingston (Y Combinator), Shana Fisher (Highline Venture Partners) and Heidi Messer (Collective[i]).Noah Lichtenstein: How much does it cost?Answer: It costs $199.Heidi Messer: Isn’t the pricing of the hardware going to make it impossible for emerging markets to get its benefit?Answer: Right now we’re selling to consumers and most of the interest we can get is in the U.S.But also we are targeting institutional partnerships as well.The price point for a security device is accurate right now.

However, the reason I got into bitcoin in the first place is the social impact.Jessica Livingston: I’d love to hear more about the genesis of the idea.How did you think this is what I want to do?Answer: I was a victim of bitcoin hacking.And I first heard about bitcoin when I was doing my PhD in consumer behavior.A lot of the conversations I was having were centered around this thing called bitcoin.I wanted to build something that wouldn’t scare of customers.What if you built a device that looks like a credit card?I made my credit card my design model.It should look like a credit card, it should be as easy to use as a credit card.So that’s where we began.Shana Fisher: What do you think of the better funded further ahead wallets the talk about cold storage disconnected from the Internet?Answer: The benefit of our device over traditional web wallets is security.Our devices are embedded.Everything that we wrote lives on the firmware.You don’t have to trust any app.It’s a multi-signature wallet and there are three keys.