Bitcoin Stack Exchange
Bitcoin Stack Exchange

Questions tagged [qrcode]

A kind of two-dimensional barcode that can be scanned by many smartphones. They can be used to encode URLs or Bitcoin addresses.

57 questions
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1 answer

Given a private key, how do you get a public address

Possible Duplicate: How are public & private keys in an address created? I am scanning in a private key from a QR code in an app I am writting to handle the import of physical bitcoins. Given a private key, how can I get the public key so that I…
RobKohr
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7 answers

What additional benefits can QR codes bring to Bitcoin applications beyond payment requests?

Anyone who has recently used one of the Bitcoin wallets on a mobile device (and some desktop clients) will have seen a Bitcoin QR code. Clearly, QR codes allow for a succinct method for transferring complex information in a reliable and…
Gary
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10
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2 answers

Using QR codes for bitcoin giveaway

Suppose I wanted to have a bitcoin treasure hunt, where QR codes were used. The first person who scanned a given QR code should receive some preset amount of bitcoins. Is this possible? (Preferably with as little need for knowledge on the part of…
lemonginger
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4 answers

What are QR codes and How do you use them as request payment from Wallet?

What are QR codes ? How do you use the QR code for payment function on the wallet ? When would you use it ?
BitCoin New Guy
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6 answers

Generating a Bitcoin Address QR code with current USD price embedded?

I'm creating a Bitcoin QR link with my website, but I want to be able to just link to a page that generates the QR code with the current USD price equivalent of BTC in the QR. I tried blockchain.info, but it only displays the QR code and I can't…
Patoshi パトシ
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4 answers

Bitcoin QR codes: raw address or Bitcoin URI scheme

I am the author of bitcoinaddress.js library and I am wondering what's the best content for Bitcoin QR codes. What Bitcoin QR codes should contain (for mobile wallet apps and other barcode scanners): Only Bitcoin address (this is only one I have…
Mikko Ohtamaa
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2 answers

Is there an Android app that will scan a QR code and show the balance?

What I'm looking for is an app that lets a person scan a QR code containing a Bitcoin address and then see the balance and transaction history for that address. For a specific use case, a mobile phone (or Android tablet, more likely) is going to be…
Stephen Gornick
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2 answers

Lightning Invoice QR-Code minimum size/display resolution?

what would be the minimum screen size to display lightning invoices as a qr-code? For the Raspberry Pi Zero I found these displays: 128x128 pixel LCD display (1.44 inch) 200x200 pixel e-paper/e-Ink display (1.54 inch) 128x64 pixel OLED display…
Jon Doe
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QR to pay more than one address?

I know that I can generate syntax for a payment qr code like so: bitcoin:xxxaddressxxx?lable=reason&amount=0.051 this pays (to) 1 address! I however, would like to know if I can scan a QR that will construct a tx that pays to two addresses (can I…
Ben Muircroft
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2 answers

Scanning QR codes with Electrum 3.0.1

When trying to scan QR codes with Electrum 3.0.1 it asks for zbar software. I'm not sure which one to download as some of them might be unsafe. Which Zbar QR scanner should we download?
Patoshi パトシ
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2 answers

How do I spend a paper wallet into my coinbase.com account using the Android Coinbase app and the paper wallet QR code?

I created a paper wallet using bitaddress.org and spent bitcoins into it using the Coinbase mobile (Android App). I then noticed that the paper wallet cut off part of the private key during printing! They don't leave anough room for the entire…
Walt Howard
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QR code on my phone looks different

I just set up a personal wallet, and the QR code on my phone, looks different from the QR code that blockchain.info shows. When I scan, the code on blockchain.info, I get the same address. I thought the QR codes were Unique. what is going on? This…
j0h
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2 answers

Do I need an app and internet on my smartphone to enable a Lamassu ATM to detect and scan my QR code?

I want to send bitcoins to a friend through a Lamassu ATM. She has emailed me her request QR code and when I went to the Lamassu ATM point, after pressing on the start button and showing the QR code on my smartphone, nothing happens. I learned that…
pearl
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How do you generate a QR code for a not so popular coin?

I'm running a the datacoin-qt client and was wondering how do you generate a QR code? This is relatively a new coin and I can generate an address, but I'm not sure where I can goto to generate a QR code for this.
Patoshi パトシ
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3 answers

How can I securely create a QR code from a bitcoin address?

My Problem I am trying to generate a QR code for a public bitcoin address, preferably using command-line tools. The process poses a security risk because malicious software can generate a QR code that represents an address different than the one…
Adam Matan
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