Topic: The official BitcoinPaperWallet.com thread -- updates and news. - page 4. (Read 55974 times)

That's the best design i've ever seen for a paper wallet

You forgot to mention unicorn breath, which is known to render all muggle technology fully transparent.

Your point is a good one though. What I'm aiming for is "casual" tamper-resistance -- for example, what would be especially useful for a paper wallet given as a gift. Myself, each time I give away 1 BTC to a friend or family member, I'm satisfied knowing that my design ensures that the recipient wont inadvertently lose their balance by letting someone post a photograph of the pretty wallet on Facebook, or to a sneaky bad roommate or ex girl/boyfriend.

This is indeed a very nice design, and canton is an awesome guy to talk with.

An idea I was contemplating, how about if you make a striped line in the middle, and a corresponding unique number per paper wallet on both of the halves.
This would allow to put the private key slip in a bank box, and keeping the public key slip in your wallet.

This way you could keep track of which public slip corresponds to which private slip.

Illustration, now I am no designer, but you get my point

That one worked without folding by using those grey rub-off stickers

You did a really good job. Keep up the good work

I think the concern applies mostly to wallets that are passed on, when you might trust the original creator but not the individual that gave you the wallet (or anyone else in the chain of ownership).

I was told that freons work, and evaporate cleanly, but have not tested it myself. 

Ultimately, what's the actual problem here? If somebody can get to your paper wallet, and wish to steal the funds, they would be much smarter to just steal the damn thing, than to tamper with stickers, solvents, photo flashes, laser scanners, optical coherence tomographs, and neutron beams just so they can scan the priv key while leaving the wallet seemingly intact. Extracting the key without damaging the paper wallet is more of a prank than a crime.

If I am ever to accept a casascius coin or a paper wallet as payment, I'll gladly rip it open and spend it into my address. If it's more than a couple of hundreds of dollars worth, I'll check it for unconfirmed spends. If it's more that a couple of thousands of dollars worth, I'll wait for a confirmation or two. That's all.

Hmm... have you tried?

You can also use some liquid to see it properly.

Make sure the layers are pressed together, perhaps between two plates of glass. This minimizes the blurring related to scattered light.

Hey there!

Someone's posted what might be a pretty good exploit on reddit, using a camera speedflash, see:

http://www.reddit.com/r/Bitcoin/comments/1jqmzv/dont_blindly_trust_bitcoinpaperwalletcom_you_can/

However I'm having a devil of a time trying to reproduce his results. See my attempts here:

http://imgur.com/a/FzPB0

Can anyone else see if they can use a flash to expose a readable QR code off of a properly printed/folded/sealed wallet? I'll gladly put up a token bounty just for fun, say .10BTC (or I'll send you a nice batch of free stickers & sealing bags, your choice.)

This is the best I could manage:

Where tamper resistance is warranted -

A) If the person is a guest in your house when it vanishes, you know who likely did it. So stealing the key to later extract funds is a better move than stealing it.

B) If there isn't much value on it, thief can wait until it has more value.

Out of curiosity... I take it this physical wallet isn't intended to be exchanged like currency?  But rather, it's designed to be a wallet to store incoming funds until such time as you wish to transfer these funds into a secure address?

In which case what's the point of it being tamper proof?  You can't use it as a medium of exchange anyways so there's no point in a tamper-proof private key.  If someone steals the wallet they can just steal the funds in it by opening the wallet anyways.  I guess this protects against someone finding it and writing down the key and leaving it where they found it, or photographic it, then?  But you can just leave the private key at home in a safety deposit box and carry around the QR code for the public address.

I can't imagine a scenario where the average person would need a wallet that can accept an unlimited number of coins until such time as you want to buy something with it, which you can only do once and only with certain technical knowledge (I'm thinking of the change, here) after which it's useless and you need a new one.

A tamper-proof private key is only useful when you want to use it as a medium of exchange, which this thing can't be used as since anyone can print off any nonsense private key they want to on the private key slot before they seal it off.

This might be a stupid question, but why can't I just sandwhich a paper wallet between two pieces of dark construction paper and put it in a sealed envelope?

Seems like a KISS solution that avoids the light thing.

I'm also really interested in using my own addy's and keys from vanitygen. Unfortunately, I have zero coding experience. I was able to use chrome inspector to change the private and public keys, but after making my own QR codes, I got lost trying to figure out where the qr code image files are referenced in inspector.  Any help would be appreciated

Hi Canton,

it's possible right now to make password protected coins using Transaction Scripts.  Thus you could make such 2-factor protected coins, but not necessarily an entire address, but there are probably ways to simulate the functionality you are looking for.

-bm

Hi bluemeanie1,

This is a neat idea, and something I'll consider if BIP38 doesn't come to full fruition for some reason. (As I understand it, visual encryption would effectively do the same thing as https://en.bitcoin.it/wiki/BIP_0038 )

As for the wallet sent to Niko not being secure because I knew the private key, it was even less secure than that because I subsequently inclued the private key in a mockup on an unrelated forum post by accident, and some clever person stole the funds while the wallet was still in transit.

But to answer your concern directly -- the purpose of this wallet isn't to simulate physical cash, it's meant for (1) storing your own coins, or (2) giving coins to people who implicitly trust you, e.g. friends, family.

For a full overview / explanation of the intent (and to try out the working code) please check out https://bitcoinpaperwallet.com

- Canton

 you can make paper wallets more secure with Visual Cryptography.

 https://bitcointalk.org/index.php?topic=226671.new#new

how is this secure?  you have the private key to his account!

are these things meant to be exchangeable?