Live data from Hacker News

PaperCoin - paper offline Bitcoin wallets

papercoin.org

21–30 of 51 posts

Re: PaperCoin - paper offline Bitcoin wallets

#21
post #19

Am I the only person who can't follow the instructions? What is the finished product supposed to look like?

Where the instructions say fold - you fold 180 degrees, not 90. So the wallet stays always flat. I added the 180 degrees note to the instructions.

Re: PaperCoin - paper offline Bitcoin wallets

#22
post #19

Am I the only person who can't follow the instructions? What is the finished product supposed to look like?

I am not a Bitcoin user and I also don't get it. Could anyone else please explain what this hash on the piece of paper is? Is this an address used to send Bitcoins to?

Re: PaperCoin - paper offline Bitcoin wallets

#23
post #22
post #19

Am I the only person who can't follow the instructions? What is the finished product supposed to look like?

I am not a Bitcoin user and I also don't get it. Could anyone else please explain what this hash on the piece of paper is? Is this an address used to send Bitcoins to?

Sequence starting with "1" together with the QR code are the Bitcoin address where you can send Bitcoins to. Sequence starting with "5" inside of the wallet is the private key, which you use to redeem the funds sent to the address in the first step.

Re: PaperCoin - paper offline Bitcoin wallets

#25

Using a Bitcoin address provided by a web site to store your coins is Extremely Unwise. You would be giving the owners of that site the power to steal your money later. Promoting a site which gives a small convenience in exchange for the power to steal your Bitcoins is not okay . Even if the site's original creators are trustworthy, it can be broken into and perverted. You risk creating a repeat of MyBitcoin (an "onl…

So you are saying even hybrid wallets like blockchain.info are unsafe?

Re: PaperCoin - paper offline Bitcoin wallets

#26
post #19

Am I the only person who can't follow the instructions? What is the finished product supposed to look like?

Follow the instructions and all you end up with is a folded piece of paper. The site doesn't bother to explain what you can do with the paper though. Seems like a significant ommission to me!

And where's my promised pizza?

Re: PaperCoin - paper offline Bitcoin wallets

#27
post #15

There seems to be some confusion about this project, so I'll try to explain: PaperCoin creates paper Bitcoin gift cards. You put money on the address, then you give the private key to whoever, and now they own the wallet. (Correct me if I'm wrong, I'm not the author.) It all happens client-side using jsPDF, and you can run it locally by downloading the .zip in the footer. It's really not meant to replace any financia…

The design may be swell, shame they didn't care enough to include useful instructions or explanations in that design!

Re: PaperCoin - paper offline Bitcoin wallets

#28
post #17

Some related apps: optar - http://ronja.twibright.com/optar/ PaperBak - http://ollydbg.de/Paperbak/ https://en.bitcoin.it/wiki/WalletPaperbackup

Have you experience with paperback?

I tried optar and did everything wrong i could find. I upscaled with gimp, upscaled not by a natural number, used a horrible laser printer with lots of artifacts, gray, thin, checkered recycling paper, folded it and it still worked. I was stunned. The decoder seems to be quite good, it can handle distortion reasonably well.

But it was only 50kB per page.

How does it compare to paperbak?

Re: PaperCoin - paper offline Bitcoin wallets

#29
post #28
post #17

Some related apps: optar - http://ronja.twibright.com/optar/ PaperBak - http://ollydbg.de/Paperbak/ https://en.bitcoin.it/wiki/WalletPaperbackup

Have you experience with paperback? I tried optar and did everything wrong i could find. I upscaled with gimp, upscaled not by a natural number, used a horrible laser printer with lots of artifacts, gray, thin, checkered recycling paper, folded it and it still worked. I was stunned. The decoder seems to be quite good, it can handle distortion reasonably well. But it was only 50kB per page. How does it compare to pape…

I also only have experience with optar, which worked for me. However, here are some reviews of PaperBak:

http://www.codinghorror.com/blog/2009/07/the-paper-data-stor...

http://www.extremetech.com/extreme/134427-a-paper-based-back...

Re: PaperCoin - paper offline Bitcoin wallets

#30
post #20
post #14

Earlier quoted context omitted.

It seems this is a bug in jsPDF - the same happens with their basic example. I might look into that, but for now please use Chrome/Firefox.

In Opera it opens a new tab with: papercoin.org/undefined

Yep, same kind of error ... :(
Post reply on HN