What you could do is to try to use tool such as: https://coinb.in/
I've been using it for quite some time and so far my keys are safe with me. What is coinb.in anyways? It is a website open-source that have basic functionality of signing an address and creating and managing transactions in general.
I use LIVE OS installed on my USB for this because every time I use this USB it is only existent in my RAM. Basically you want to boot up your live OS, download coinb.in pull the information about available inputs via some available block explorers out here and simply go offline after you get your inputs. Plugin other usb with your priv key or you can install software that can read QR from your camera codes before you even go offline and can read your private key this way. Sign a message with that private key and simply save your hex encoded bitcoin transaction either on your hard drive or plugin another USB so you can simply broadcast that hex later on.
I found this to be effective thing to do for me, might be a bit complicated but so far it have served me well.
I don't really see an other offline solution as you will still have to pull unspent inputs from somewhere.
Topic: Request - Offline app to sweep Paper wallets? - page 2. (Read 453 times)
technically impossible.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
No it is not impossible. The scanning and encryption of the private key is done offline, to protect it from the above mentioned dangers. Nobody can visually record or snoop your session, if this is done offline.
The App will have to contain some software to convert the QR Code to text
technically impossible.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
OP said that he wants to automatically sweep it as soon as he goes online, while having all the data encrypted, and I think the following program should work.
First, we need a digital camera to take a photo of QR code, then you connect it via USB to an offline machine, and decode the QR code from a photo to get the private key. Then you insert the address you want to sweep to, and the app creates a signed transaction with paper wallet's address as an input. Then you can transfer this signed transaction via USB or by scanning it's QR code on your phone, check that it is correct by some other software (Core, Electrum, etc.) and broadcast it.
But I'm not sure if this app is needed - it can be useful if someone is dealing with huge amounts of paper wallets, but if it's one-time only, then it's not a problem to do everything I've described step-by-step. Maybe it can be implemented as a feature in some wallet that already has a good cold storage functionality, like Electrum or Armory.
The App will reduce the risk in doing this ONLINE. You cannot have a situation where you stored coins securely for years in a paper wallet and the moment you go online to sweep it, then it is gone.
Every time I have to sweep paper wallets, I get that tightness in my ass, because you never know who is looking over your shoulder.
My long-term strategy for cold storage require me to have multiple paper wallets with small quantities. I do not want to store all my eggs in one paper wallet and every time I want to sell, I have to sweep all my coins and expose my whole hoard/private key. It just make sense to have multiple paper wallets, if you want to store bitcoins for a long time, but sometimes you have a need to use some and then you only have to sweep 1 or 2.
technically impossible.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
OP said that he wants to automatically sweep it as soon as he goes online, while having all the data encrypted, and I think the following program should work.
First, we need a digital camera to take a photo of QR code, then you connect it via USB to an offline machine, and decode the QR code from a photo to get the private key. Then you insert the address you want to sweep to, and the app creates a signed transaction with paper wallet's address as an input. Then you can transfer this signed transaction via USB or by scanning it's QR code on your phone, check that it is correct by some other software (Core, Electrum, etc.) and broadcast it.
But I'm not sure if this app is needed - it can be useful if someone is dealing with huge amounts of paper wallets, but if it's one-time only, then it's not a problem to do everything I've described step-by-step. Maybe it can be implemented as a feature in some wallet that already has a good cold storage functionality, like Electrum or Armory.
technically impossible.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
The process of sweeping private keys involves a transaction in the blockchain.
I think what you meant was "importing" private keys.
But all in all, one time exposure of your paper wallet's private key means that you intended to spend its balance,
so there is no need for such security measure unless the wallet you're using is unsecured too.
I just need a user-friendly way to sweep bitcoins from a offline paper wallet onto the Blockchain, without having to expose your private key, whilst you are online. People can screen grab the private key or they can use key capturing or clipboard highjacking in Malware to steal your private key. ^grrrrrr^
Give us a offline method to scan the QR code for the private key and then to copy & paste that onto a application, linked to the Bitcoin address you want to sweep it to and then encrypt that before you go online. The moment you go online the app connects to the Blockchain and it decrypts the information and sweep the key.
The source code should be OpenSource and posted on Github with a signed message from the developer. No logs must be kept or information redirected.
Can this be done?
Give us a offline method to scan the QR code for the private key and then to copy & paste that onto a application, linked to the Bitcoin address you want to sweep it to and then encrypt that before you go online. The moment you go online the app connects to the Blockchain and it decrypts the information and sweep the key.
The source code should be OpenSource and posted on Github with a signed message from the developer. No logs must be kept or information redirected.
Can this be done?
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