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.
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need help completing my order to sell bitcoin [closed]
I created an order to sell my bitcoin but don't know how to complete the transaction. How do I scan the QR code or copy and paste the details to where you are sending / withdrawing the crypto from. ...
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Where is a good source of information for procedural algorithm to program my own Bitcoin QR code generator?
Not trusting those already available QR code generators available, I would want to program my own. The idea is to input a Bitcoin key ( private or public ) and the program would simply generate the ...
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Message signing with airgapped wallet that doesn't support it
I need to implement message signing for various HWs, many of them support it on a firmware level, but some airgapped wallets like SeedSigner or Jade still don't. I was wondering if there's a way to ...
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If I scanned my QR Code once with my android phone from a paper wallet, but now it wont..Why
I can no longer scan QR code from my paper wallet that I purchased from kiosk atm machine. I was able to scan it once, now the paper wallet has smears, rubbed off sections, etc. The kiosk machine's ...
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How to gift an entire BTC wallet via QR code?
I have a unique scenario where I'd like to:
Create a BTC wallet and add a small amount of funds to it.
Generate a QR code that contains the private key.
Then gift that QR code to a friend so they can ...
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2
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Electrum's custom Base43 - looking for a 2-way deterministic hex converter
I am looking for a tool, suitable for an amnesiac offline air-gapped Linux Live host
that will deterministically convert in both directions, between raw hex and Electrum's custom Base43 format, used ...
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How to use Bitcoin Core on a laptop as a hardware wallet [duplicate]
I would like to have the following setup:
Bitcoin Core on an offline laptop. Here the private keys are stored. Full disk encryption.
Bitcoin Core on an online laptop. Here watch-only addresses from ...
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Prepare transaction with multiple recipient
Do you think it is possible programmatically prepare a Bitcoin transaction that has multiple recipient to send the amount to?
Do you think I can show this trasaction in QR code, so payer can scan it ...
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How do you generate a qr code for a new address and check for incoming payments from the command line?
Which one do you recommend for this
Command line to generate QR-Code + address for requesting money
Command line to check if the above has been received
I don't want to install too many versions of ...
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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 ...
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Does a Bitcoin qr code become invalid after 1 Year?
I have been trying to figure out if there exist a software which preserves a BTC QR code for more than one year.
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How to test my Bitcoin QR code without giving my bank account
I set up a QR code on my website to receive Bitcoin payments. So now I need to test it. I thought that if I install a Coinbase app it would let me scan it with its QR code scanner to see how my QR ...
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How could PSBT deal with data capacity limit of QR code?
QR code has very limited data capacity. (According to Wikipedia) one single QR code can only carry <3KB of binary data.
It's not rare for a PSBT to hit this 3KB limit, especially for ones which ...
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QR code life span
Once the QR code is generated, how long is the code good for 24 hours, 48 hours? I googled for the answer with no success.
Thank you
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QR Scan "Unrecognized format" mycelium "Mastering Bitcoin'
Noobie here.
In Ch. 2 of Antonopoulos' "Mastering Bitcoin", I try to scan figure 2-2 (per his instruction) using a recently installed Mycelium on my Android.
Why do I keep getting "Unrecognized ...
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Is it fraud? Would banks ask for fees through bitcoin?
So a man came to me on Instagram saying that he wanted to buy old money specifically from Hong Kong for a museum in Philadelphia, and that he would pay me good money for my old coins and bills, then ...
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Can I print my public key using a custom logo?
qrycode monkey allows me to print a qr code with my company's logo in the middle.
Q: Can I do the same for our public key?
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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 ...
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Is BTCFrog bitcoin QR code generator hacked?
The following URL is self explanatory. It is trying to generate a QR code requesting 0.005BTC at the shown address
http://www.btcfrog.com/qr/bitcoinPNG3.php?address=31oLAAQDmuRAGfkviHPDXFgV15To4idott&...
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Bitcoin QR code on a product sold in stores [closed]
How and which company do i turn to implement a QR code for bitcoin on a product sold within stores.
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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 ...
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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 ...
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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 ...
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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/...
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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/...
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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 ...
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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
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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,...
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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 ...
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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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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! ...
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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 ...
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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 ...
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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?
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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, ...
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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 :...
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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 ...
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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.
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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 ...
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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,...
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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 ...
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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):
...
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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 ...
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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 ...