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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.

2
votes
1answer
28 views

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 ...
0
votes
1answer
26 views

Sent BTC to Jaxx Wallet Never Received [closed]

A friend suggested I use Jaxx Wallet so I downloaded the software and sent my BTC using their QR Code from Coinbase. Looking back, I should've left it where it was! It never arrived. I also sent LTC ...
0
votes
1answer
32 views

Use of Bitcoin paper wallet

A Bitcoin paper wallet contains a pair keys: public key (address used to receive coins) and private key (allows to spend coins stored at that address). Those keys are printed in a form of QR-codes so ...
1
vote
0answers
68 views

block.io + scan generated QR code

So i created a block.io account and playing around with bitcoin address generation, as well QR codes. My source code for generating a new bitcoin address is that one: include_once("payment/block_io/...
1
vote
1answer
36 views

How can I generate the qrcode client-side that would be compatible with the Ardor Wallet qrcode

I'd like to generate a qrcode the same way the Ardor Wallet generates it, such that it would be compatible. I found qrcode related javascript shipped with the Ardor node download in ardor/html/www/js/...
0
votes
1answer
102 views

possible to generate qr code using only bitcoin core?

Bitcoin core qt generates a qr code. Can I do it with the json rpc or by some other means without using 3rd party libs? Right now, I'm using a 3rd party lib and it's working; just trying to tighten ...
0
votes
1answer
69 views

Wants to send my bitcoin to another wallet

I’m having issues trying to send my bitcoin to another wallet...it been asking me to confirm a whr code which I don’t really understand cos I have enough money on my wallet
1
vote
1answer
58 views

Is it secure to put a wallet address on one's business cards as a QR code?

As a company, we're making business cards, and would like to put our bitcoin addresses on our business cards as QR codes. Yet, I know that it is a best practice for wallets to cycle addresses - I mean,...
0
votes
1answer
186 views

parameters for bitcoin QRCode

im reading up on this page ==> https://github.com/bitcoin/bips/blob/master/bip-0021.mediawiki I am currently trying to incorporate a message in the qr code but when i proceessed the qrcode it pulled ...
-1
votes
1answer
245 views

Lost ETH due to faulty QR code on Ledger Nano S

I was transferring ETH from my Coinbase app to my Ledger Nano S. I used the QR code generated by the Ledger Ethereum Chrome app and it scanned fine. The funds, however, never reached my account. When ...
0
votes
1answer
96 views

Are QR codes on paper wallets necessary

I don't have a wireless printer so I'm thinking about writing down the keys by hand on pieces of paper. Obviously I can't copy the QR codes that way. Are they necessary or do they just exist just for ...
0
votes
2answers
2k views

Possible to transfer BTC via QR code?

Is it possible to embed an amount of BTC in a QR code to transfer to whoever scans it? E.g. I create a QR code for .5 BTC from my wallet, send the QR code to someone (without knowing their BTC wallet ...
2
votes
2answers
1k views

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?
0
votes
1answer
4k views

Encypted Private Key -> QR Code

I have a paper wallet with a public address and an encrypted private key ( with a passphrase ), but no QR code. So I need a way to generate a QR image, or manually input the key. Sadly QR generators ...
2
votes
0answers
487 views

How Can I create a wallet on Electrum from address or QR code?

Suppose I signed up in a website which creates me a bitcoin wallet address for my account and provides me with this address (someting like 2RfG1Ph5KlojhnFi8Dg36lfeshnfDiL3Ji) and the QR code. How can ...
0
votes
1answer
598 views

How do I transfer BTC from my Coinbase account to my Android wallet?

When sending BTC (funds) from the Coinbase website, it asks for a bitcoin address to which to send it. What is one supposed to do, type it in? What I would like to do is display a QR code in my ...
1
vote
1answer
473 views

Whats the use of QR-codes during wallet to wallet transfer?

I want to know hen the QR-code scanning actually takes place. For instance, if I send my wallet address to someone, how does the person verify that the sender is me, and what do I need to do as soon ...
0
votes
1answer
649 views

Is it safe to show the QR code to his friends?

I was opening my Jaxx wallet this morning and some of my friend made a pun saying they would take a phoyo of tmy QR code to buy some tickets with it. I was therefore wondering if it was safe to show ...
3
votes
2answers
2k views

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! ...
1
vote
1answer
522 views

How to put QR Code whenever I generate a unique address? block.io API

Hi guys as the title says. how can I generate a QR code whenever the block_io.php generates a unique address? I seem to have a problem when calling $newAddressInfo or $newAddressInfo->data->address ...
2
votes
0answers
471 views

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 ...
0
votes
1answer
177 views

Generating a QR code using the NXT / Ardor api for scanning

Currently the nxt gui generates a QR code for certain pages where you can scan with your phone or another computer to do an air gap transaction. How can you do this via the api?
5
votes
6answers
13k views

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, ...
0
votes
2answers
538 views

Generate QR Code tesnet

I would like to generate a bitcoin paper testnet wallet. A paper wallet is a QR code of a private key and a QR code of a bitcoin testnet address, I assume it can be generate juste like this link does :...
1
vote
1answer
119 views

First time buyer, questions before I screw up

I am wanting to buy BTC to buy goods but things are a bit confusing to me. First off, would I be better off buying from someone or a website, or use an atm? Once I purchase the BTC what is the best ...
-1
votes
1answer
208 views

Is there any platform where we scan a QR-code and receive the Bitcoin payment?

Like if I want to send 1 BTC to someone I give him a QR-code. He scans it and receives the money. You load your QR code with Bitcoin as payment voucher.
0
votes
1answer
282 views

Dog identifier in blockchain

I would like to print qr-code with transaction that contains my home address to print it for my dog's necklace. If dog will get lost everyone can scan it and get the address. How can I prepare the ...
0
votes
1answer
407 views

Which mobile apps support swiping/importing private keys via QR code?

The bitcoin.org site that provides a list of wallet clients doesn't clearly show which allow for importing bitcoin via a QR paper wallet. Does anyone know a location to see which support such features,...
2
votes
1answer
462 views

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 ...
4
votes
3answers
6k views

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): ...
1
vote
3answers
1k views

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 ...
0
votes
2answers
3k views

Bitcoin transfer through QR codes

Ok, so let's say I have a wallet with 1 BTC in it. Is it possible to transfer that balance to a QR code or some type of barcode? I want to know if it's possible to basically print out a piece of ...
1
vote
1answer
553 views

How to scan QR code with multibit wallet application?

I downloaded the multibit application for windows and was wondering if there was a way to scan a QR code with my webcam? If so where do I click because I dont see an option and no way am I going to ...
-1
votes
1answer
90 views

Any examples of Bitcoins being used to buy bonds to build a Digital Community [closed]

Does anyone have examples of bitcoins being used to buy bonds to build a digital community?
6
votes
4answers
38k views

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 ?
4
votes
2answers
3k views

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 ...
1
vote
1answer
586 views

Which mobile apps allow me to redeem a private key from a QR code?

Which mobile apps will let me scan a QR code of a private key (such as the one created by BitAddress) and then spend the funds from that coin? Please specify Android, iPhone (iOS), etc.
16
votes
1answer
1k views

Given a private key, how do you get a public address [duplicate]

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. ...
10
votes
2answers
2k views

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 ...
11
votes
7answers
1k views

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 ...