QR

lime_GRN

The new cold card Q1 is such a beautiful hardware wallet. Removable batteries , QR scanner for added protection. The goat of HWWs imo thing is perfection

Revolutionary_Ad6252

I agree! It has the best features of all the hardware wallet companies: Fully Air gapped with QR codes.. My favorite feature is that you can use the adress explorer, displaying the adress QR to receive funds without ever connecting the device to the internet or any wallet software.

Revolutionary_Ad6252

I don´t know if it is really trustless. Raspberry Pi´s have closed source components (Broadcom chips). I think the Krux DIY is fully open source. Anyhow if you never connect the device to the internet I would assume it is save. However a major downside is that you have to keep an unencrypted QR of your seed close to you if you want to do transactions which is definately not optimal. Other signers store your seed encrypted which enabled you to store your backup in a saver location.

ah__there_is_another

I connected my ledger to windows, checked the address in ledger live, scanned its QR directly from the exchange app I meant to send from, and had no issues or concerns. Why would I follow your method? I think not inputting your key on digital devices and checking the network/address is enough.

pullupman

Copy/Paste and then verify the first 4 and last 4 characters of the address you are sending too. That's more than enough to circumvent address poisoning. In most cases the address you are sending to is either your own private wallet, back to the exchange or a third party via QR code. It's not nearly as unsafe as some people think it is if you are using widely accepted tools, wallets, and exchanges IMO.

Spirit_Fox17

What if your purchased an external wallet? I am not promoting, though I found out about ledger through work. They provide a physical device where you can offload your currencies to a wallet you can store wherever (with the potential to scan QR codes and other features and price points).. hope this helps people! God Bless 🧿🪬🧿

Key_nine

$DIGI, it is under a million in market cap but it looks like something with potential, it could fail like any other projects but it is definitely doing some different things than other coins. It wants to bridge the gap between the digital world and real life at its locations. It has one location so far but wants to be an IRL metaverse and NFT art display entertainment venue that only using QR, AR and crypto.

Background-Mark4503

Post a QR code.

mister-marco

HSBC canada was blocking anything related to crypto,not only buying actual crypto but even assets crypto related like coinbase stocks,mining companies etc... sadly the way around it is to change bank or find a way to pay cash. In canada you can get a QR code from kraken, then go to a post office with cash and show the QR code and deposit cash in the kraken account, there might be a similar thing in cyprus

ClairvoyantTrader

Any bitcoin wallet that you use has an address and a QR code you can use. You can either put that on your website or just have the customer scan it when they pay. I own a small business also and my problem is I’d like for customers to be able to pay with their credit card, but then the funds are instantly converted to bitcoin and sent to my wallet. I haven’t found anything that does that.

MacaroonMiddle7229

Why is supply chain tracking with blockchain any better than without? It's impossible to guarantee a package or the tracking method on it such as a QR code hasn't been tampered with, poisoning the now immutable data on the blockchain. No different from doing it with a centralized system.

Rippedyourgetoffme

So i scanned the QR code for this but didn’t send anything to the address provided. Am i at risk bc i scanned this?

MaintenanceGold6992

Bitcoin Well; just provide “an” email address, username, and password, and you’ll be able to buy at any of their ATMs using your account’s QR code to buy non-KYC

anzel2002

Yeah, people sent us tips to the QR code in our movie [Finding Satoshi Nakamoto ](https://www.youtube.com/watch?v=oDcNkggCXRQ)

branajgka

You can actually achieve the same thing with FUN using Fizenwallet. Instead of needing someone's account details, you can just scan a QR code to send them FUN easily. Also, BTC, LTC

RedPanda888

How is accepting payment via crypto for a new business any more simple than say having a PayPal account? Or Stripe integration with your website? Or for example in my country here in Asia most small businesses just have their QR code for their bank account and people just scan the code and pay you directly (no payment terminals or payment processors needed). Honestly thought I am not discounting that there are undoubtedly more benefits I probably haven't thought of...but I just generally think that the benefit of crypto as a currency/payment system is largely dead in countries that have already modernized or advanced banking systems that are easy to use.

CryGlass974

Thanks bro!! Got it to work though check this out... The QR scanned from another lap top by turning the laptop screen upside down and pointed the F ker at the ELECTRUM QR scan ..... DONT WORK. I tried it few times. Then typing it in worked fine. That really threw me off. I screen shot the QR codes private keys and ELECTRUM just blinks and nothing happens when trying to scan. So that something to keep in mind. Maybe cause it's a touch screen laptop but I doubt that's got anything to do with it. So again typing it in worked 2nd time around cause I F it up the first time trying to type the DEVIL in. Currently sending Bitcoin to Kraken and from there to the bank. If you have any pointers on that I would much appreciated.

96geckos

Blockstream Jade in QR air gapped mode is what I prefer.

Corbimos

Go to the wallet, hit those 3 dots for more settings, and then export/backup. You will see a QR code. That QR is just a representation of the 12 words at the bottom. Write down those 12 words and keep them as a backup. This is your private key. Anyone who has these words will have access to your bitcoin. You can share that if you need the wallet on a different phone. But as stated before, do not keep this on your phone or computer. Bitcoin is a bearer asset with these words. You will be stolen from if any device is compromised. And keep these words safe in case you lose your phone. No, you won't need blue wallet specifically. It is a BIP39 standard. As long as the wallet supports BIP39 you will be good. Most good wallets do.

buildooors

$KIN Fully circulating supply Code Wallet allows for fee less instant transfers with visual ‘QR code’ or link Runs on top of Solana (even if down) as an L2 with anonymity Multiple SDKs available to integrate with websites Enables micropayments as low as 5 cents !

Tasty_Action5073

Exactly. Don’t all wallets have an address check? Meaning if it wasn’t an address it won’t send. And there is almost 0 chance to fat finger an address with another. Also, who types addresses these days? We have QR codes.

Tasty_Action5073

Why do you still test transactions before sending? I know this was a thing sometime ago, but things got much much better now. I send to QR codes 99.9% of the time.

CryGlass974

I got 2 lap tops both new hardly ever connected to internet if ever. I don't even want to update the windows since I use them for live music. How ever I already sweep the paper wallet with Electrum. I had some issues with scanning QR codes generated by bitaddress .org by turning my laptop screen upside down and trying to scan it in with the other lap top. It would scan but the NEXT button would be grayed out so that force me to try sweeping. Which I did and then QR codes didn't work again until it suddenly work by typing it in. Strange thing is people are talking about the wait period is so long so I chose 10 blocks which took around 5min to transfer fair bit of money. for 43 CAD. Should of chosen 25 that would probably take 10 15 min and the cost was 13 CAD but here on reddit they talking about something like 250 min and so on. Make u s..t your pants. It's either old post or things have changed since then. My paper wallet is at least 8 years old. Was another guy on Reddit who said the same thing as you and the QR scanning stopped me from importing the key. I tried few times and maybe it would work if I just printed on paper instead of trying to scan it in from another laptops monitor. Next step is to send it to Kraken.

CryGlass974

Thank you!! But go it to work but check this out. When I use QR code it don't work. What i did is put of line lap top took a screen shot and then scan it in to the other computer and nothing happens so when I typed it in manually then it work OK. I tried few times to scan the QR code but maybe using laptop screen to scan the QR of it maybe got some issues with that . If it was printed paper then maybe it would work. So That's resolved but luckily I typed it in (Pain in the S). Cause I been doing it all day cause of other reasons. So now it works and I can see the balance and asking how many blocks I want for the fee so I'm choosing between 10 or 5 . But here is the thing 5 blocks and 10 blocks are the same price which are reasonable price but somethings tells me if I choose 5 the price will change later lol. So I'm leaning for 10 to be safe unless they giving discount on 5 making it the same price as 10. Sound like trap. lol. Thanks for the Decrypt info. It really helped Cause I been wondering why no app is asking for the passphrase lol just the private key. But now I know you have to do as you suggested going back to Bitaddress and do the Decrypt there. Any suggestions on how many blocks should I choose for transaction fee and someone said that after you broadcast he was charged a lot of money $450. Probably his moving s..t load of money.

himtnboy

Depending on how tech savvy you are, for hardware wallets, Tangem is simple, secure and cheap. In its easiest setup, you don't know your seedphrase (you can if you want). You just have 3 credit cards. In the middle are simple wallets like Trezor or Ledger. You use usb cables to sign transactions so you are briefly connected to the internet. Most complex and expensive, but most secure are airgapped wallets like Cold Card or Keystone. You sign transactions via SD card or QR codes and are never connected to the internet.

CryGlass974

Thanks. So I reply to you earlier and erase my comment cause now I arrived at that stage you mentioned above. So bitaddress OFF line. Asks for the private key that's on my printer paper from years ago. So I type it and ask for phaseword and then I hit DECRYPT as you mentioned... and the spits out different bitcoin addresses 1Private key WIF and Private Key WIF Compressed QR codes plus binary. That's what the Blockchain.coms wants Compressed private key. I could go there right now like man that I am but since you said no it's a no go BUT if I got to ELECTRUM in sweep option. If I scan or even type those two private keys that it spit out earlier only Compressed key works but nothing happens. Just blinks and I didn't receive anything in my Electrum wallet. I know for sure I used the passphrase which I wrote down and all of this should be working but for some reason it dont work in ELECTRUM. Kinda confused here. Do you think passphrase is wrong?

CryptoSp4de

I haven’t used the QR code part of it cause I honestly just didn’t understand it. Only thing I don’t like is that I have to keep my seed on a flimsy piece of paper 

Odd_Monk_132

It's still unlikely that it will be banned / made illegal. There's always the issue of jurisdiction too - where would it be banned? How do you trade with other countries where it's not banned? Also a thing to consider is it can be banned but such a law would be unenforcable. You can literally roll dice to create a wallet and print QR codes on paper to recieve.

mrpoops

What legit use dwarfs the illicit drug trade on the bitcoin network? Who are these vendors accepting enough bitcoin for your statement to be true? The off brand convenience store down the street that has a “pay with bitcoin” QR code next to the 5hr energy drinks by the register? There is no Amazon or Walmart that takes it. Major retailers don’t deal with it at all. So how is it possible that legit uses offset just the Sinaloa cartel alone?

Internal-Recipe

Update: found a work around via wifi disablement before scanning alternative address QR code, then set the transaction up for review, and enable wifi before spending/sending. Issue now is that the broadcasting will not complete, and no troubleshooting is available. Additionally, blue wallet will only create a for viewing only copy of the samouri wallet, even though the recovery code is used. Options? Unsure.

Shyssiryxius

You are correct, I used the word seed phrase without realising this. It would have just been my Bitcoin core wallet password that I seem to remember using Bitcoin core to generate a 512bit or character password then using a QR code generator to store the info. I might have been just using a random character generator but the built in 512 bit thing really hangs in my memory somehow. The thought of needing the .dat file in addition to password makes me realise how far we've come.

Frogolocalypse

> Bitcoin used to be this cool concept where I'd convert my seed phrase to a QR code and store under my bed. Not 12 years ago it wasn't. Seed phrases were introduced in Septemper 2013.

lntipbot

Hi u/Financial_Design_801, thanks for tipping u/direktor4eto_reborn **⚡︎500** (satoshis)! You didn't have enough balance, you can pay the following invoice [[QR](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/qr?id=bbba543735e24c3586dfb9ac665a9c75 "Generate QR") / [URI](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod//uri?id=bbba543735e24c3586dfb9ac665a9c75 "Generate URI")] instead. *** >!lnbc5u1pnzjw3rpp579xxd5nl4347zdy56eqjj68vhk7gey9hjdfc0lrxh9lg383a85rqdp5vf3xycf4xsenwve4v5ergcenx5urverxvgukzcekxc6kzwtrxu6scqzzsxqyz5vqsp5sl7pdc6x3dcnpdql9akp6vu42ueunlyc39plkzm5w60v6gw20jcs9qyyssq738vz0g6xmkyxq5tlsl2v6n4g2h7jzgffx49nyptddp4ew3jpvdzjrg3nezrtc7q77njmustvceaj2xfzj4s9hfqhnw2vh257frazzcptzrqkz!< *** *[^(More info)](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/info) ^| [^(Balance)](https://www.reddit.com/message/compose/?to=lntipbot&subject=balance&message=!balance) ^| [^(Deposit)](https://www.reddit.com/message/compose/?to=lntipbot&subject=deposit&message=!deposit 10000) ^| [^(Withdraw)](https://www.reddit.com/message/compose/?to=lntipbot&subject=withdraw&message=!withdraw put_invoice_here) ^| ^(Something wrong? Have a question?) [^(Send me a message)](https://www.reddit.com/message/compose/?to=drmoore718)*

Shyssiryxius

Hahaha, I have enough where I'll never be poor. Have realised it's enough to not trust others or hardware wallets with its security. It's really humbling to see how little Bitcoin core has changed. Yet everything else got so complicated. Bitcoin used to be this cool concept where I'd convert my seed phrase to a QR code and store under my bed. Address validation wasn't a thing and it's was easy to lose funds. It peaked around $120 bucks and everyone I talked to about it thought it was in a bubble! I remember this Russian exchange (btc-e) and chat box with a user 'fontas' who used to pump feathercoin like night and day. Didn't know it at the time big he must have been an OG whale. Can't say I didn't make a bit of money on those pumps... Wonder where he is now? Times changed and companies saw an opportunity to simplify custody and made it easier, but we seem to have come full circle and now 3rd party is risky again. Feels good to fire this up and dedicate a PC to protecting my generational wealth. Not only am I taking it all into my own hands but the memories from a decade ago it's made me remember from another life is really cool. Keep stacking mate, we can't rewind the clock and I made plenty of mistakes along the way. But it's the lessons we learn and people we meet that's important. God speed!

UncleMoonSoon

$VELO are about to launch Orbit, their crypto payment super app that'll be installed across thousands of retailers, with the aim of getting over 500,000 merchants on board before the end of 2024! This is a game changing, mass adopting Web3+ crypto payment solution for the everyday person. Launching in Thailand where the vast majority of the population already uses QR code payment options in their everyday lives, $VELO plan implement Orbit across neighbouring SE Asian economies before a global launch campaign. We are witnessing the early stages of a globally recognised name that'll dominate the industry for decades to come. This is just 1 or many products for the Velo labs team. You are early. You do not have enough $VELO

UncleMoonSoon

$VELO are about to launch Orbit, their crypto payment super app that'll be installed across thousands of retailers, with the aim of getting over 500,000 merchants on board before the end of 2024! This is a game changing, mass adopting Web3+ crypto payment solution for the everyday person. Launching in Thailand where the vast majority of the population already uses QR code payment options in their everyday lives, $VELO plan implement Orbit across neighbouring SE Asian economies before a global launch campaign. We are witnessing the early stages of a globally recognised name that'll dominate the industry for decades to come. This is just 1 or many products for the Velo labs team. You are early. You do not have enough $VELO

Ok-Translator4438

This is true but I created this sheet for quick reference of many public addresses with QR codes without the need to open an app. This could be export as a PDF and stored on the desktop or whatever. And more importantly this is useful to manage multiple bip 84 child accounts index numbers for organization.

sporadicmoods

“I’ll sell when I can buy milk and eggs with a QR code” Realest shit I read today 🔥🔥🔥💯💯

taribor

doh, sorry. I'd be full of crap if I tried to have an encryption dialogue with you. I follow/read macro articles by nsa/ibm/etc and follow the news, but am in no way qualified to talk about schemes or specific tech. I know QR is a big deal in the government right now, so I try to pay attention to it.

Lookralphsbak

For those of us using BTC like a savings account, we don't... I'm not interested in selling BTC for USD. Sure if we could all tell the future and sell at the top, and then again at the bottom, it would be great, but for 99% of us that's just impossible and most of us would sell too early or too late and buy back in too early or too late. The average retail investor can't time markets, and especially with all the factors we have during this cycle - you have people projecting various tops: $100k, $120k, $300k, $500k, and some people are so high on hopium they really think that we're gonna hit $1MIL this cycle. Imagine selling at $100k and then watching BTC 2x or 3x from the point where you sold, and then waiting to buy back in but it never goes below the point where you sold it at. That's why I'm better off just buying weekly and having cash buying power to buy in bulk during big dips. I'll "sell" btc when I can go to most local grocery stores and buy milk and eggs by scanning a QR code.

Clearbelow12000

I recently purchased a the ELLIPAL titan mini which is air gapped and user friendly using QR codes that interfaces with their app. It’s was $99 I am very happy with it.

lntipbot

Hi u/BirdLooter, thanks for tipping u/hateschoolfml **⚡︎500** (satoshis)! You didn't have enough balance, you can pay the following invoice [[QR](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/qr?id=535c1db185af4caabd651f04d0fd03c3 "Generate QR") / [URI](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod//uri?id=535c1db185af4caabd651f04d0fd03c3 "Generate URI")] instead. *** >!lnbc5u1pnzgt0cpp5vsafdqad0tjslm4wwx9rcz4qj2p44hglt6qhec9yd63frp7cjkrqdp5x5en2ce3v33rzwp4v9nrgcmpv93xgd34x9nrqdryxpnxgvpnvvescqzzsxqyz5vqsp5pwk757qud3374m6w9p8ph8y658a8s5q2kf2ma877fm3h02rzghrs9qyyssqy0fkk523wn5h62ne33pj844lgv6a09s4j3wpjcx6fe94qzxdup0nyaqcel7899ytvfxtvhljl98f4cu062vn5kvffft5jxjc4atp7wsqcrtk5u!< *** *[^(More info)](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/info) ^| [^(Balance)](https://www.reddit.com/message/compose/?to=lntipbot&subject=balance&message=!balance) ^| [^(Deposit)](https://www.reddit.com/message/compose/?to=lntipbot&subject=deposit&message=!deposit 10000) ^| [^(Withdraw)](https://www.reddit.com/message/compose/?to=lntipbot&subject=withdraw&message=!withdraw put_invoice_here) ^| ^(Something wrong? Have a question?) [^(Send me a message)](https://www.reddit.com/message/compose/?to=drmoore718)*

lntipbot

Hi u/FunWithSkooma, thanks for tipping u/hateschoolfml **⚡︎500** (satoshis)! You didn't have enough balance, you can pay the following invoice [[QR](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/qr?id=68c39e92632c4c5bb01f84b8a33dd4d7 "Generate QR") / [URI](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod//uri?id=68c39e92632c4c5bb01f84b8a33dd4d7 "Generate URI")] instead. *** >!lnbc5u1pnz8tcapp56g0lpvuh2sr47czzp80sq0hxszlxqfnusudvr9n9fqrea398kz3sdp5xcuxxveev5unyd3nxf3ngce4vf3rqvtx8q6xywrpxvekgep5vsmscqzzsxqyz5vqsp5pmxtqnz0akyxk560cxwz7zun87r3hrklkqv6d7wehlmvl63nkt9q9qyyssqu6pexaqvw7uenm86zjua8zrhcuz24hzteqqkmk0tucdz7jzaf0lpqg2045hdmwc8pmd6nucddlh986avuu36t2yj7cxketd6wwux70sp0weryg!< *** *[^(More info)](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/info) ^| [^(Balance)](https://www.reddit.com/message/compose/?to=lntipbot&subject=balance&message=!balance) ^| [^(Deposit)](https://www.reddit.com/message/compose/?to=lntipbot&subject=deposit&message=!deposit 10000) ^| [^(Withdraw)](https://www.reddit.com/message/compose/?to=lntipbot&subject=withdraw&message=!withdraw put_invoice_here) ^| ^(Something wrong? Have a question?) [^(Send me a message)](https://www.reddit.com/message/compose/?to=drmoore718)*

Jiten

QR Code is just a way to present a short piece of text in a way that a computer can easily read. It can have anything. Usually used for links, though.

Aussiehash

USB flash can degrade over time, you would be best also printing out on paper your multisig quorum (all cosigners' XPUB and the wallet descriptors) I would also recommend for confidence and redundancy that you recreate the exact same multisig quorum in other wallet software (not export the wallet from Electrum, but recreate) in SparrowWallet or Specter. Specter has a very nice PDF wallet export function with all of the public data in text and QR format, and SparrowWallet is overall the best wallet software.

DarthLiberty

Hot wallets I would recommend: (In no particular order) Exodus Green Nunchuk OneKey Green can also used with the Jade hardware wallet. Green can also be used with any QR code style airgapped hardware wallet. OneKey can also be used with the OneKey hardware wallet. Nunchuk can also be used with Coinkite Tapsigner, Satscards, Coldcard. Nunchuk can also be used with any QR style airgapped hardware wallet. Nunchuk can also set up multisig wallets using multiple hardware as keys.

According-Ad-2594

Yeah. The QR code you drew is just a visual version of your 24 words. The list of words and QR code both contain the same information - just shown and stored in different ways. They are interchangeable so both can be used to restore the same wallet.

Illustrious_Plate610

Short answer: yes QR is air gapped After you type in the seed phrase one time into a phone / computer: don’t use it ever again - just create a new one

OalBlunkont

When I hit the backup button it generated a pdf with four QR codes (two for each wallet). On the screen I was presented with a 15 letter password with a one Ietter checksum. I generated these wallets in 2016. Mycelium Wallet version is 3.16.2.0 Addresses?

RTX_Raytheon

There’s a bunch of ways to do it. But just use an offline QR code maker lol

bun-bun-time

this is the first time i hear about QR code.. where can i find more info about this? i would like to learn about it. thanks

brainbone

I have 3 of 4 QR quadrants... but am stuck in the arcade :\\

tea_and_biology

Alrighty, I've collated a dictionary for most of the script used in Serpen's Arcade, have a password, a quadrant of a QR code, and all but eight of the card phrases. Elsewhere, there's something about a blue cat, a bloody doll, a missing item needed as an input, and a hidden 4 of spades. Also received this message via e-mail (after correctly inputing 34 as the fibonnaci number index for a triangle [here](https://www.cutehumangame.com/iliiillilliliiliilliliillililliliilililliilliliillillililliliiil) - which I think might be a teaser clue?): QOX⅂+Φ=2 xㆁQ+/O=1 ᕒx𖦑ᕒxᕒ=19 \>⊙ㆁQ𖦑x=9 x+⊙O+x=12 \>>O/<⊙=9 ▽<ᕒᕒ>ᕒ=19 Φx𖦑▽++=11 ㆁᕒ><⊙𖦑=? The symbols will reflect numbers and/or operators, but don't have time to figure them out right now. If the symbol translation map in the same way as in Serpen's Arcadem, X may equal ÷. What else have peeps found?

tea_and_biology

To check, in the Helicopter game in Serpen's Arcade, has anyone managed to get past the first QR quadrant? Flying blind, eep!

bullfy

Look for QR code to send seeds to?

Javelinx65

I am trying to get some funds off a Blue Wallet with some lightning tokens in it. I scan the QR code on the new muun wallet and it says the transaction is on the network but it never processes. Any suggestions?

GregoryGoose

>CoinBase stating I was involved in a data breach from Turbo Tax. wha- what? Hey, dont feel bad, I see scams in my line of work every day. I'm just always impressed by how they can give people the most made up excuses and it never raises any flags. They can just be like, "Oh, this is your itunes account executive, a russian satellite hacked your phone from space and now you need to send us $500 of itunes gift cards or youll lose all your music" and people will just believe that shit. Just today I handed a survey card to a customer, and yeah, it has a QR code on it, but we also have it written down for people who dont know how QR codes work. Anyway, I wasnt paying attention and this woman downloads a scam app to scan the QR code with, which acts as its own internet browser and pops up a payment screen whenever you click anything. So she's entered all of her credit card info, and asks me how to specify the tip amount. I'm like what? We dont take tips. And when I saw what she was doing my heart sank. I had to tell her that even if she doesn't press enter, that website has likely recorded all of her keystrokes. She'll want to get her card replaced. All because she was trying to leave a good review. Poor lady.

advias

A POS company needs to do this to scale by making some sort of tap-to-pay or a QR code to pay

Odd_Monk_132

Use 2 of 3 or 3 of 5. If you do 4/4 you will loose your money. The point is to make it more resistant to loss or theft. 2 of 3 means you can loose 1 key, 3 of 5 means you can loose 2 keys. 4 of 4 is the same as 1 of 1. Except you have 4 things that you can loose. For generating keys you can generate them on any of the devices. You can make the wallet in Bluewallet, Sparrow or whatever. Save the wallet description file alongside the seed word backups. You can import the wallet description file into any online wallet, it'll be a "watch only wallet" and you can generate recieve addresses with it and unsigned transactions. When you spend you send the unsigned transactions to the HWW's (signers) as PSBT on sd cards or via QR codes. You sign the transaction on the signers and then transfer it to the online computer. The hardware wallets are designed so you don't need to expose the keys to the internet. You can happilly spend and use a wallet offline with HWW signers.

Duford6

I am surprised SeedSigner is not mentioned as much here. The only draw back of a SeedSigner is the creation of a metal seed QR, which is a little more involved. Other than that, it is the best in my opinion. Computers cannot generate purely random numbers, so the SeedSigner camera to seed function is very safe (and less hassle than throwing. Dice 50 times). Gives your seed phrase more entropy. Additionally, having the seed not live on the device is also nice added security for people who don’t plan on spending much and can keep the metal seed safe.

puffman123

Cold card waste of $. Go seed signer or foundation passport. Both use QR codes. Seed signer way cheaper and better UI. Foundation passport better UI UX and better support. And better quality IMO

RTX_Raytheon

Just go old school, print out a QR code!

Squezeplay

Yeah but in digital age almost everything has variable pricing now. Go to a restaurant with one of the QR codes and they don't need to reprint menus to update prices. Every time I go to the grocery store meat and veggies have different prices, up or down, depending on various suppliers. A more obvious example is airfair, hotels, or anything time dependent.

Original-Assistant-8

I think I inquired on that long ago, but haven't seen exactly what the solution would be. Can you share what has been built or documented? I believe it would allow for inserting a QR signature scheme, but that's all I know.

onetruecharlesworth

Right but with my phone and my headphones they are directly communicating via the Bluetooth protocol. I’m not even scanning an QR code to sign the receive address or anything when I make it in sparrow. They just seem to be blindly know they belong together somehow and that’s the part I don’t get. Super appreciate the response btw thank you so much for trying to help me work this out.

Onad55

The technology you want is Shamir Secret Sharing. But the implementations for Bitcoin wallets seem to be proprietary which is not appropriate for long term backup. SSS allows you to split one master key into many sub keys where N of the sub keys are required to reconstruct the master key. I’m not familiar with all the offerings out there so perhaps somebody has a solution that does the right thing. What I know is the math and from that I can deduce what can be done. But the math can’t say what has been done. SSS is not multi-sig since it has the vulnerability that combining the sub keys always generates the master key so the hardware that does the combining has to be trusted not to leak the master key (Never use an online tool to generate, encode or decode keys these sites likely log every use and can easily determine if there is a real wallet behind the key). For archival storage you want to be able to recover your wallet master key from just the archived sub keys. Some tools want to store additional data with the keys. All you should need to reconstruct a wallet from scratch is the number N, a set of N sub keys, the index of each of those sub key and a device that follows the standard protocol. The first N sub keys or master could be keys you already have or generated with tools following bip39. Any additional sub keys will have a value dictated by the rest so bip39 would not be applicable. QR Codes could still be used to store the additional sub keys.

CaptainDr

If you can copy and paste, or point at a QR code you can move your coins

JivanP

NGU is a good breakdown of what's wrong with the cryptocurrency sector as a whole: it's rife with scams being peddled to an uninformed/misinformed general public. The actual money/currency use case is pretty sound, and relatively easy to use. The vast majority of wallet apps have a simple workflow: 1. Recipient shares their address with you, in either text or QR code format. 2. Sender enters the recipient's address, either by copy-pasting the address or scanning the QR code. The address string / QR code may optionally specifically an amount the recipient wishes to receive. 3. Sender enters amount and chooses transaction fee, then hits send. 4. Recipient instantly sees incoming funds waiting to be confirmed (akin to traditional bank clearing, but truly irreversible). For the Lightning network, the workflow is slightly different, for technical reasons: 1. Recipient specifies the amount they want to receive, and beverages a Lightning invoice, which is a string of text similar to an address. It can be represented as a QR code in the same way as an address can. 2. Sender pastes invoice string or scans QR code, confirms payment details, then hits send. 3. If payment was successful, recipient instantly sees funds available in their wallet to spend, no other confirmation of any kind is necessary.

robeewankenobee

Even so, it's one thing to let them deal with data collection/processing, and another thing to invite them to the party ... anyway. There are QR chains already. Any L1 can scale up or implement a QR system/upgrade.

SpectaularMediocracy

I might agree if I wasn’t going for a stateless QR setup. But using a HW this way means I wouldn’t benefit from the many features offered by the price tag of the Q. Especially when I want 3 for multisig. But I’ve never heard anyone who has a coldcard complain about it so must (and should) be good for the price.

SpectaularMediocracy

The Jade on paper has all the features you’d ever need. But I had a lot of trouble using the QR mode when scanning the QR on the small Jade screen from my laptop with Sparrow wallet. I think the next iteration of the Jade will be great if it makes this feature more reliable. On the other hand it pushed me to use mobile wallets as my phone camera is much better than the laptop webcam. But HW’s like the Coldcard Q and Foundation passport do better with larger screens for QR mode. Obviously there’s a step up in price though

hitma-n

What do you mean stateless QR mode it’s very temperamental?

SpectaularMediocracy

I wanted to get the Q but the price + delivery + taxes seems ridiculous. Building a seedsigner which seems best from a QR stateless perspective

SpectaularMediocracy

I’ve had a Trezor, Jade and building DIY a seed signer. I really like the Jade, but for stateless QR mode it’s very temperamental. Otherwise a great HW. Seedsigner seems pretty user friendly and a bigger screen. Thinking this might be the one while being user friendly too.

Hsiang7

I checked out the website. I like the idea behind it, particularly the payment request option for requesting a specific amount of a particular cryptocurrency. However, I'll say that I DID encounter some technical difficulties in trying to link my ETH address. I try to add a new address and press confirm, but it just kept loading forever without actually linking the address. This I'm not able to provide a link for my address here unfortunately. I assume there are some technical difficulties that need to be worked out on the site still. I understand the idea of it being just an address book essential for your different wallet addresses? How does the sending of such crypto work then, since you need authorization from your personal wallet to send funds, but the website is not linked to your personal wallet? Wouldn't you have to copy the wallet address from the site and input it manually into your personal wallet anyways to authorize the transaction and send crypto to that person? In that case, why not simply just copy and past the address or scan the QR Code directly? How does your website deal with this problem without being directly being integrated into someone's personal wallet?

Substantial_Bear5153

Please educate yourself on how public-private key cryptography works. A public key is like a postbox/IBAN, while the secret private key works like a stamp which signs messages associated with the mailbox, and it can open the mailbox. Connecting to a web3 website is an operation which just lets the website know the postbox/account address. This is completely passive and harmless, and is the “Connect” action prompted by your wallet. Making any non-passive actions, such as approving some contract (e.g. Uniswap, or a hacker) to be able to spend your funds, requires a stamp/signature for this action to be made with your secret private key. Just like a deed needs to be signed to become effective. The UI prompt for these two operations looks similar due to Metamask’s questionable UI design. This is one of the reasons why it is A VERY GOOD IDEA to use a hardware wallet or at least a smartphone QR code scanning based wallet such as AirGap Vault. This way, your private key does NOT reside on your PC, it can not be stolen, and you can not accidentally use it to SIGN something that can harm you unless you plug in the hardware walley and click its signing button. Or you scan the QR code to be signed into AirGap wallet. Using a wallet such as Metamask with the seed on your PC is thus a very very very bad idea. Scam sites present the signing action as just some minor thing to do (you wrote “I just signed something above”) while it is in fact everything but. And since the secret key is on your PC in Metamask, it will happily do this harmful signing action. Performing a signing action === funds leaving your account, simple as that. Do not use Metamask, it forces you to keep a seed on PC. Rabby is a much better wallet extension. Get a hardware wallet or use airgap vault. Delete the seed from your PC and keep it in a hardware wallet or in airgap vault. Learn the difference on web3 between the actions of connecting (harmless, does not need private key) and signing (results in moving funds, needs private key).

riscten

Ledger is lower tier. It's not super safe, and not super convenient. It's designed around older paradigms and connects over USB/BT, meaning it is not fully airgapped. For higher security, look into wallets that can be used airgapped, and possibly also stateless. Jade, Seedsigner and Foundation Passport are good examples. All of them can transact using QR codes, meaning they are fully usable with iOS.

lntipbot

Hi u/Generationhodl, thanks for tipping u/rizzobitcoin **⚡︎1000** (satoshis)! You didn't have enough balance, you can pay the following invoice [[QR](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/qr?id=74086a983af04feaa0727d2d12e9b107 "Generate QR") / [URI](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod//uri?id=74086a983af04feaa0727d2d12e9b107 "Generate URI")] instead. *** >!lnbc10u1pnpd0ecpp5ccsan2evcqcdyvcv30zxe4h4xxugsqyc5ptuhhxelfk6zyws3h8qdp5xu6rqwpkvyunsvmpvccrgen9v9snqdejxajryep3xfjnjc33xqmscqzzsxqyz5vqsp59zzuafh3yx0fgqtf20vj4tz7mfznpgeplkp0dvmvktj08cyp6w2q9qyyssqxncwcurfvh9adq66xn5grcme4csk6vr0sechy3s8jrydymxtdhq4cujw0yyy00t4th9vtrsl8dyet0ez0p98wsrrcc6m68gpyyr7kycqzahmqs!< *** *[^(More info)](https://xnf5cwpq73.execute-api.us-west-2.amazonaws.com/prod/info) ^| [^(Balance)](https://www.reddit.com/message/compose/?to=lntipbot&subject=balance&message=!balance) ^| [^(Deposit)](https://www.reddit.com/message/compose/?to=lntipbot&subject=deposit&message=!deposit 10000) ^| [^(Withdraw)](https://www.reddit.com/message/compose/?to=lntipbot&subject=withdraw&message=!withdraw put_invoice_here) ^| ^(Something wrong? Have a question?) [^(Send me a message)](https://www.reddit.com/message/compose/?to=drmoore718)*

safehodl

1. Possibly depending on the hardware wallet, most will only change their firmware if it's cryptographically signed by the wallet developer. 2. Again, depends on the hardware wallet, but most use a special chip for signing and the display for showing what is being signed. It would be difficult to compromise this with malware alone, likely it would require physical tampering with the device. 3. The problem with USB is you don't know what communication is occurring. If you use an SD card or QR code based signing this greatly limits the communication that can occur. TLDR - I recommend you use a Coldcard + Sparrow and only use the MicroSD for communication. If you want additional security consider a 2/3 multisig with 3 different kinds of hardware wallets.

riscten

Generally, the simplest yet safest way is to use an open source wallet that doesn't have wireless functionality (Bluetooth, NFC) or USB, or at peast that can have these features disabled, and works instead using QR codes or SD cards. Blockstream Jade, Seedsigner, Coldcard and Foundation Passport are the top contenders that I know of.

BOFPH

-- 1. Yes -- For maximum security you want the interaction between the cold wallet and the software wallet to be as simple as possible, so that you can monitor as much of it as you can. USB, Bluetooth and NFC are generally not the safest as there could be a ton of data going on over these channels that you don't see. With SD cards and QR codes it's easier to control what data gets transmitted. You won't necessarily be able to decipher what data is transmitted, but you'll at least know when data is being transmitted So the problem is that I can be hacked even by using the cold wallet. Because if my laptop is compromised I don't know it of course.

riscten

1. Yes 2. The hardware wallet doesn't connect to Internet through your PC. In fact it doesn't connect to the Internet at all. The job of a cold wallet is to keep your keys from ever being exposed to the Internet. You can always check the balance on your address by just looking it up on the blockchain (for instance by searching for your public address on mempool.space). When you want to spend from that address, you'll use wallet software (such as Sparrow or Nunchuk on your PC or phone). The software will generate a transaction from your address to the address you want to send the funds to. But then that transaction will be unsigned, meaning that it won't be accepted by the network (otherwise anyone would be able to send money from any address they want). That's where the cold wallet comes in. The transaction that was prepared by the wallet software is sent to the cold wallet, either via USB, Bluetooth, NFC, SD card or QR code. Then the cold wallet will sign the transaction using the private key it knows, and send back the signed transaction to the software wallet (again via USB, BT, etc). That's all the cold wallet does. Once the software wallet has the signed transaction, it can send it to the network, which will then move the coins. For maximum security you want the interaction between the cold wallet and the software wallet to be as simple as possible, so that you can monitor as much of it as you can. USB, Bluetooth and NFC are generally not the safest as there could be a ton of data going on over these channels that you don't see. With SD cards and QR codes it's easier to control what data gets transmitted. You won't necessarily be able to decipher what data is transmitted, but you'll at least know when data is being transmitted.

robyer

QANX is currently just ERC20 token living on Ethereum network, which makes it not quantum resistant. They keep promising mainnet launch since 2020, postponing it year after year. Cellframe is better, but the CELL you are buying/selling on exchanges is again just ERC20 token on Ethereum. They have one-way bridge from this ERC20 token to their native blockchain, but since it's one-way, you won't be able to sell that native coin anymore! QRL is fully working open source quantum-resistant blockchain project since 2018. Available on MEXC, LBank and XT exchanges as the real QR coin.

robyer

QANX is currently just ERC20 token living on Ethereum network, which makes it not quantum resistant. They keep promising mainnet launch since 2020, postponing it year after year. Proof: [https://postimg.cc/mP9pVntY](https://postimg.cc/mP9pVntY) Cellframe is better, but the CELL you are buying/selling on exchanges is again just ERC20 token on Ethereum. They have one-way bridge from this ERC20 token to their native blockchain, but since it's one-way, you won't be able to sell that native coin anymore! Proof: [https://postimg.cc/8JZZjQ0S](https://postimg.cc/8JZZjQ0S) (on their website) QRL is fully working open source quantum-resistant blockchain project since 2018. Available on MEXC, LBank and XT exchanges as the real QR coin.

robyer

QANX is currently just ERC20 token living on Ethereum network, which makes it not quantum resistant. They keep promising mainnet launch since 2019, postponing it year after year. Cellframe is better, but the CELL you are buying/selling on exchanges is again just ERC20 token on Ethereum. Then have one-way bridge from this ERC20 token to their native blockchain, but since it's one-way, you won't be able to sell that native coin anymore! QRL is fully working open source quantum-resistant blockchain project since 2018. Available on MEXC, LBank and XT exchanges as the real QR coin.

Intrepid_Ad4398

Using dice to generate the seed minimises the chance of supply chain risk along with using the device statelessly and airgapped via QR codes, as they would need to compromise both the software wallet (Nunchuk or Sparrow) in addition to the Jade - this is my understanding.

Cntrlsquare

This is an interesting point though - what happens in a quantum resistant fork? Presumably people will need to prove ownership of wallets to transition them to QR via the existing encryption mechanism. So will there be a time window to transition after which the old “lost” coins are locked, or will those be a target for the best encryption breakers to crack the wallets and take ownership?

pha3th0n

The most complete answer yet. I remember that QRL published articles explaining why it matters to be QR from the onset instead of appending it afterwards. It's a long play, I have a small bag and see it a bit as "insurance" in the case of a surprise breakthrough event in quantum computing. And I guess you are being downvoted because people don't like to hear that their QR coin is not as QR as they were told...

callmev269

As far as I know, QRL is the only chain with audited technology that has quantum resistant capability. And it's superior to others out there that claim to have QR but actually don't.

robyer

The current leader is QRL - www.theqrl.org - which is using post-quantum cryptography (currently XMSS) since their mainnet launch in 2018. They are professional and serious in their goals, the project is open-source and actively developed. They will soon be releasing a major upgrade which will bring Proof of Stake (currently it's PoW) and EVM-compatible smart contracts, together with support for new CRYSTALS-Dilithium signature scheme, to their blockchain. There are some other projects which are claiming to be using post-quantum cryptography, but they are in many cases just trying to ride on the QR hype which is slowly starting (and it will get worse with time) in a way that they are just ERC20 token, are closed source, centralized, dead or just plain scam. Some are claiming QR but they are still using Elliptic curves and PQ is only optional/"for future". Someone mentioned Algorand, but they use QR only for their state proofs (and even there it seems it's not used correctly as they match it with not-PQ zero-proof method) and not for the wallets (which is the important thing). So just be careful and do your research on the QR claims of each project as it's often just false marketing.

Kriskao

I have a QR code of the public address of one of my wallets, decorated with the B logo in the center. I have never has anyone scan it and send me bitcoin, but there is still tome for that to happen. Unfortunately it is not visible unless I am shirtless and I am almost never shirtless outside my house :-)

Fidulsk-Oom-Bard

Buy some, don’t use that napkin QR code tho

Charlie-boy1

Don’t use the QR code! Buy anywhere but there. Now if it was a swan or strike ad, I’d be down.

radman430

If you are at one of these ATMs and I can walk up behind you and take a picture of the QR code I can now decide in the next few minutes if you are somebody I want to rob. All I have to do is watch that address and keep refreshing to see when you send some BTC to it. As soon as you do, I now know your personal wallet address. How much do you have in there? It might be worth my while to confront you in the parking lot or follow you home to try strong arming you into giving up what you have left. Unlikely sure, but not out of the question. You’ll surely notice somebody lingering around you while trying to type in that long string of letters and numbers.

radman430

If you are at one of these ATMs and I can walk up behind you and take a picture of the QR code I can now decide in the next few minutes if you are somebody I want to rob. All I have to do is watch that address and keep refreshing to see when you send some BTC to it. As soon as you do, I now know your personal wallet address. How much do you have in there? It might be worth my while to confront you in the parking lot or follow you home to try strong arming you into giving up what you have left. Unlikely sure, but not out of the question. You’ll surely notice somebody lingering around you while trying to type in that long string of letters and numbers.

iwanttoendmylife22

NDAX didn't, which is why I'm criticizing it. They don't expose functionality to scan a QR code; from what I could find at least

iwanttoendmylife22

I tried using the iphone camera app but it was unresponsive to the QR code. I guess it's configured to only display QR codes that result in a URL rather than ones that result in an alphanumeric, like bitcoin addresses

radman430

I’m not entirely sure on this but what I got from the post is that there may not have even been a QR presented to be scanned. If that is the case then I would assume this is an attempted security measure by the ATM operator. No QR code means no one can snipe a picture over your shoulder without you noticing. It also forces you to manually verify the entire address since you have to manually type the whole thing out.

pezdal

I don't know what NDAX's app looks like, but you could have scanned the QR code with any app and then cut and pasted the address. :-)

Kallen501

A wire requires account numbers, a routing number, the name and addresses of the recipient and recipient bank, and the sender has to go through an authorization procedure. The wire won't be sent without several forms of confirmation if it's over a certain threshold. A crypto payment requires only 2 values: a recipient address and an amount. Yes, it can be confusing at first, but given QR code integration and copy/paste functions, a reasonably techie youngster can learn to crypto in less than 10 minutes. I've taught hundreds of people to use mobile wallets. I help them write down their seed phrase and send them a payment. Then I have them pay me half of the coin back to practice sending coins. Think of Apple Pay, Paypal, Venmo, etc. Thousands of people are learning to use these apps daily. It's really not that hard.