How to generate qr codes for address and private keys?

Altoidnerd

sr. member

Activity: 406

Merit: 251

http://altoidnerd.com

Using the new bitcoin-core binaries in linux (be sure you have qrencode installed):

Code:

addr=$(./bitcoin-cli getnewaddress) && ./bitcoin-cli dumpprivkey $addr| qrencode -o ~/Desktop/$addr.privkey.png && echo "private key dumped for: "$addr

See http://altoidnerd.com/2015/09/06/how-import-a-bitcoind-address-private-key-into-breadwallet-ios-with-a-qr-code-using-bitcoin-core-for-ubuntu-linux/

Keep in mind the above snippet generated a new address. You can use and address you have in mind e.g. "address":

Code:

addr="address" && ./bitcoin-cli dumpprivkey $addr| qrencode -o ~/Desktop/$addr.privkey.png && echo "private key dumped for: "$addr

Or if you have the private key as a string = "privkey":

Code:

key="privkey"; echo $key | qrencode -o ~/Desktop/mykey.png && echo "private key qr mykey.png created for $key

empoweoqwj

hero member

Activity: 518

Merit: 500

Quote from: Rannasha on December 16, 2013, 05:17:45 PM

Quote from: smeagol on December 16, 2013, 04:56:59 PM

Quote from: Rannasha on December 16, 2013, 04:51:48 PM

You can use bitaddress.org, the "wallet details" tab lets you input a private key and it will generate a QR code.

Of course, to ensure more security, you can save the website to disk and disconnect the machine from the internet (or better yet, copy the saved page to an offline machine) before you input your private key.

I already have a vanity address and a priv key, so I would like to convert that.

Yes, you can do that with bitaddress.org. It does more than generate keys. Open the page, go to the "Wallet details" tab, input your private key and it will make the QR codes.

I second that. Bitaddress.org is excellent and easy to use.

smeagol

legendary

Activity: 1008

Merit: 1005

Quote from: Rannasha on December 16, 2013, 05:17:45 PM

Quote from: smeagol on December 16, 2013, 04:56:59 PM

Quote from: Rannasha on December 16, 2013, 04:51:48 PM

You can use bitaddress.org, the "wallet details" tab lets you input a private key and it will generate a QR code.

Of course, to ensure more security, you can save the website to disk and disconnect the machine from the internet (or better yet, copy the saved page to an offline machine) before you input your private key.

I already have a vanity address and a priv key, so I would like to convert that.

Yes, you can do that with bitaddress.org. It does more than generate keys. Open the page, go to the "Wallet details" tab, input your private key and it will make the QR codes.

Thank you!

Rannasha

hero member

Activity: 728

Merit: 500

Quote from: smeagol on December 16, 2013, 04:56:59 PM

Quote from: Rannasha on December 16, 2013, 04:51:48 PM

You can use bitaddress.org, the "wallet details" tab lets you input a private key and it will generate a QR code.

Of course, to ensure more security, you can save the website to disk and disconnect the machine from the internet (or better yet, copy the saved page to an offline machine) before you input your private key.

I already have a vanity address and a priv key, so I would like to convert that.

Yes, you can do that with bitaddress.org. It does more than generate keys. Open the page, go to the "Wallet details" tab, input your private key and it will make the QR codes.

smeagol

legendary

Activity: 1008

Merit: 1005

Quote from: Rannasha on December 16, 2013, 04:51:48 PM

You can use bitaddress.org, the "wallet details" tab lets you input a private key and it will generate a QR code.

Of course, to ensure more security, you can save the website to disk and disconnect the machine from the internet (or better yet, copy the saved page to an offline machine) before you input your private key.

I already have a vanity address and a priv key, so I would like to convert that.

MA5H3D

member

Activity: 99

Merit: 10

brainwallet.org will do that among other things.

Rannasha

hero member

Activity: 728

Merit: 500

You can use bitaddress.org, the "wallet details" tab lets you input a private key and it will generate a QR code.

Of course, to ensure more security, you can save the website to disk and disconnect the machine from the internet (or better yet, copy the saved page to an offline machine) before you input your private key.

smeagol

legendary

Activity: 1008

Merit: 1005

Quote from: smeagol on December 16, 2013, 04:39:50 PM

Is there a service which can convert plaintext addresses and private keys into qr codes?

Thanks

I found this: https://github.com/casascius/Bitcoin-Address-Utility

Is there an already compiled version? I don't want to install the deps.

smeagol

legendary

Activity: 1008

Merit: 1005

Is there a service which can convert plaintext addresses and private keys into qr codes?

Thanks

Topic: How to generate qr codes for address and private keys? (Read 9831 times)