How can I create a bitcoin QR code securely?

Rahar02

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Quote from: LoyceV on October 09, 2018, 02:03:11 AM

So they do selective scamming? Address 3Jqm9TynrExdKifkwdmVGfcYpz3nmQqnVT has received over 4 Bitcoin.

Most likely yes, as I have tried another address but the result still that address. Whatever address we submit, the QR code generated refers to that address. Sadly if 4 bitcoin comes from innocent people who didn't aware of this matter.

Quote

This makes it very important to test your QR-codes before ever using them, but I wouldn't know how te securely test a private key code other than with a phone that will never go online after that.

Yeah, double check before putting bitcoin on the line as there is no payback.

LoyceV

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Quote from: Rahar02 on October 09, 2018, 01:51:29 AM

Yes, it makes me wonder whether it is safe to generate bitcoin QR code online since there are many sites offers this service. After googling, chose one site on top of the search (https://bitcoinqrcodeSCAMgenerator.win/) and then try to generate my address (bc1qf7zhzckwr2nymljs5m7tdm0qx7nwslg5sde30p)

The result was surprised me because the QR code generated refers to address (3Jqm9TynrExdKifkwdmVGfcYpz3nmQqnVT) I have tried it 3 times, still generated that address. and then I thought; maybe it is another address of mine, connected. Check it through blocktrail. But it totally different address.

So they do selective scamming? Address 3Jqm9TynrExdKifkwdmVGfcYpz3nmQqnVT has received over 4 Bitcoin.

This makes it very important to test your QR-codes before ever using them, but I wouldn't know how te securely test a private key code other than with a phone that will never go online after that.

Rahar02

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Quote from: OgNasty on October 08, 2018, 05:36:59 PM

Quote from: TryNinja on October 08, 2018, 05:11:55 PM

Just use Google's API:

Yes, that would work great for public keys. I would think any of the "a lot of bitcoin QR creation tools" mentioned by the OP could do that. Him mentioning "secure" makes me think he's wanting to make a QR code for a private key.

Yes, it makes me wonder whether it is safe to generate bitcoin QR code online since there are many sites offers this service. After googling, chose one site on top of the search (bitcoinqrcodegenerator.w**) and then try to generate my address (bc1qf7zhzckwr2nymljs5m7tdm0qx7nwslg5sde30p)

The result was surprised me because the QR code generated refers to address (3Jqm9TynrExdKifkwdmVGfcYpz3nmQqnVT) I have tried it 3 times, still generated that address. and then I thought; maybe it is another address of mine, connected. Check it through blocktrail. But it totally different address.

Tried another site, ~~bitcoin-qr-code.com/qr3~~ but the result is disappointing as well.

So, this is probably why OP ask it in the first place.

LoyceV

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Quote from: OgNasty on October 08, 2018, 05:36:59 PM

Him mentioning "secure" makes me think he's wanting to make a QR code for a private key.

Bitcoinpaperwallet.com can do this, running offline from a LIVE Linux DVD (download the site first). I'm not sure how well it works with SegWit though.

vit05

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I think you want one that you can use on an off-line computer. There are these two in github, just fork them.

https://github.com/soldair/node-qrcode

https://github.com/kazuhikoarase/qrcode-generator

OgNasty

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Quote from: TryNinja on October 08, 2018, 05:11:55 PM

Just use Google's API:

Yes, that would work great for public keys. I would think any of the "a lot of bitcoin QR creation tools" mentioned by the OP could do that. Him mentioning "secure" makes me think he's wanting to make a QR code for a private key.

TryNinja

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Just use Google's API:

Code:

https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=YOUR-BITCOIN-ADDRESS-HERE

Example: 1NinjabXd5znM5zgTcmxDVzH4w3nbaY16L

Code:

https://chart.googleapis.com/chart?chs=150x150&cht=qr&chl=1NinjabXd5znM5zgTcmxDVzH4w3nbaY16L

Result:

Bitcoinexch

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There are a lot of bitcoin QR code creation tools but which of them are secure, and create a genuine qr code?

Thank you

Topic: How can I create a bitcoin QR code securely? (Read 237 times)