Hi 413j0,

Thanks for the testing out the design! I didn't think it would be feasible to 'pinch' apart the folded layers, at least not without damaging the tamper-evident tape. Honestly, I tried your technique for about 5 minutes, both with a needle and by manipulating the inner fold with some sticky tape on the end of a firm bit of cardboard, but I just couldn't get them to separate so as to attempt an illuminated photograph. I don't doubt you succeeded -- it's just that on my end I wasn't able to. Perhaps it's my paper stock (or even humidity!) that's making it difficult. In any case, I'll think on this challenge a bit and see if there's an improvement I can come up with on the design. In the meantime, your addition of extra duct tape (or as others have suggested, slipping in a bit of tin foil) are great ways to improve the light impermeability.

As a thank you for your work on this, if you private message me your mailing address I'll send you some of the brand new tamper-evident stickers that include unique sets of serial numbers printed in white thermal foil (see image below).

Sorry for the confusion here, I think you might have noticed that for a few days, bitcoinpaperwallet.com (the live website) was a little more up-to-date than the git code. This is because I was soliciting feedback before pushing some significant Oct 1 version changes to github. (For example, you can now use your own keys / vanitygen and you aren't obligated to use the built-in random key generator.)

At the time I'm writing this, both the website and the github code should be identical. I'd post the SHA1SUM here, but what I prefer is for you to check the GPG signature that is distributed with the github zip code:


The reason I prefer the GPG signature method is that it's not vulnerable to situations like bitcointalk.org getting hacked and having its posts modified. Not that this could ever happen of course, because bitcointalk.org never gets hacked.

I think almost any water/rip proof paper will be functionally similar to Teslin. There are a bunch of brands that I'm testing. I believe most of them just use polyester (plastic) instead of paper pulp.

Don't trust it on my word! Just run a "diff" between the two HTML files and you'll see that the only significant changes are in the user interface and graphics, not in the crypto. Well there's one difference -- Gavin Andresen sent me a patch to take advantage of better crypto available in some browsers, and that's been folded into https://bitcoinpaperwallet.com as well.

Thanks for this idea. I was thinking about signing the ZIP but my worry was that some (possibly significant?) number of browsers automatically extract ZIPs. Also, if I'm using GitHub to distribute the ZIP file, where would I publish that message + signature? What I like about GitHub is it's a one-click ZIP download...

Thanks for any additional advice here.

BTW Just chipping in here to say this is a valid deal, not a scam, and presently the only way to get a discount on my paper wallet kits.

I'll be processing orders as they're placed through coinforest -- usually 4 days to ship USA, 10-14 days international.

I'm the author of https://bitcoinpaperwallet.com -- a fork of bitaddress.org that implements a two-sided tri-folding paper wallet design that resists tampering.

I've been encouraging users to download the ZIP of the generator to run in their local browser, but I'm a little stuck in giving them ways to easily verify the integrity and authorship of the file once it's downloaded. (E.g. to show that the ZIP file wasn't molested on github or subsequently messed with on their local filesystem.)

You can download the ZIP from github here: https://github.com/cantonbecker/bitcoinpaperwallet

The best I've come up with is this bit of instructions:


The way I see it, people can easily search forums, etc. to verify that Canton Becker (canton@gmail.com) is the true author of the service, and even if someone else generates a PGP public key for canton@gmail.com, it won't pre-date May 2013.

Is there a better way for me to be signing the wallet generator file?

Thanks for any guidance on either my process or the instructions I'm giving out.

Hell, I'll shamelessly self-promote if asked

https://bitcoinpaperwallet.com

Because:

• It's offline (won't get hacked)
• It resists being accidentally compromised (e.g. photocopied or scanned by helpful family member)
• I know I can trust the generator (I forked it from bitaddress.org myself)

For a "hot" wallet to spend or receive smallish amounts of BTC, my favorite is just blockchain.info using the chrome extension.

As the author of bitcoinpaperwallet.com I'm gratified by your trust! However just to make sure: are you downloading the ZIP file to run the generator on your local secure computer and network instead of running it straight from the website? (You should.) Also, if you want to be extra safe for long-term cold storage, check out synthetic papers like "teslin" and/or sprays like Krylon "Preserve It".

Not sure about laminating, but here's some of the stuff I've been experimenting with:

Krylon "Preserve It!" -- acid-free spray
Teslin brand synthetic paper

At the very least I recommend keeping the wallets in a nice zip-sealing bag like the ones I feature at bitcoinpaperwallet.com

- Canton

I think laminating *should* be fine, and especially will improve inkjet longevity.

Also look into synthetic waterproof tear-proof papers, e.g. "Teslin". These can even make inkjet prints waterproof. However as these are polyester, perhaps they should not be laminated. (Melt?)

For those who are curious, that wallet design is from http://bitcoinpaperwallet.com -- and you can order properly-sized ziplock bags for geocaching etc. on the same site.

Thanks very much to the both of you for the kinds words.

Today I just figured out a really basic solution to (additionally) discourage tampering. Just use a 3rd sticker to seal the bag itself:

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.

Hmm... have you tried?

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:

I believe this has to do with whether a Raspberry Pi Model A vs Model B is being used under the hood. See:

http://www.element14.com/community/docs/DOC-51668/l/raspberry-pi-model-a-versus-model-b-chart

I like WooCommerce + Bitpay plugin. This is what we just used to add acceptance of BTC last week at:

http://synergeticpress.com

Why?

• Bitpay lets you instantly turn sales into 100% USD or 50%/50% USD/BTC, etc. - not bad for a  1% fee.
• Bitpay payments and notifications are sometimes confusing/messed up and woocommerce gives you a good server-side backup of each order
• It just works. And you're using the two biggest players in the field (woo for ecommerce, bitpay for BTC) so there's a decent chance neither half of the solution will go belly-up in just a few months.

As far as I know, Synergetic Press gets to claim bragging rights as the first book publisher (physical books, not just ebooks) to accept Bitcoin. Am I right in this, or is there another business that sells their books for BTC?

http://www.synergeticpress.com

In any case, it's appropriate that Synergetic Press trail-blaze with Bitcoin the since the books they publish are all fairly revolutionary in nature. (Re: LSD / psychedelics, modeling the Earth's environment in closed-systems to prepare for space travel, etc...)

To celebrate their acceptance of BTC they have an unlisted coupon code BITCOIN for 10% off any orders. They ship anywhere in the world as well.

Thanks. I'm trying to confirm whether or not Synergetic Press can claim bragging rights as "the first book publisher to accept Bitcoin". I know that some ebooks have been sold with bitcoin, but as far as I know this is the first time an entire catalog of actual books have been available for BTC.

Also check out their latest publication, Tony Juniper's "What Has Nature Ever Done for Us? How Money Really Does Grow on Trees." I know there are a lot of economist types on this forum, so they might take note:




Order ($30USD / 0.3 BTC): http://www.synergeticpress.com/books/what-has-nature-ever-done-for-us/
Use coupon code BITCOIN for 10% off entire order.

"Look Inside" preview: http://issuu.com/synergeticpress/docs/frontmatter_through_forword