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.<p>Promoting a site which gives a small convenience in exchange for the power to steal your Bitcoins is <i>not okay</i>. Even if the site's original creators are trustworthy, it can be broken into and perverted. You risk creating a repeat of MyBitcoin (an "online wallet service" run anonymously that predictably ran off with everyone's deposits).
I hate dinging hobby projects, but then it's Bitcoin and people seem to be actually trusting hobby projects with non-trivial fractions of their (extremely notional) net worth, so I'll just point out that transferring a public/private key pair which allows people to spend money together over HTTP is not a security best practice.
Note that <a href="http://bitaddress.org" rel="nofollow">http://bitaddress.org</a> was the pioneer in this field.<p>Bitaddress.org has more options, and includes all necessary code in a single .HTML file. So if you download it to run it locally/offline -- <i>as you should</i> -- whether you grab it from your browser, or from the Bitaddress github project, there's just one file and hash to check against the published hash from others who have reviewed the code.<p>Papercoin adds the 'printer' graphics and the folding-friendly layout, but trust should be the top quality in any such utility, since private key secrecy is everything.
Safari gets redirected to a URL like this: blob:<a href="http://papercoin.org/some-big-hash" rel="nofollow">http://papercoin.org/some-big-hash</a><p>This, of course, doesn't work. When I try to remove the "blob:" it throws a 404.<p>Edit: works in Chrome, just not in Safari. Neat idea!
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.)<p>It all happens client-side using jsPDF, and you can run it locally by downloading the .zip in the footer.<p>It's really not meant to replace any financial infrastructure. It's just a novelty thing. Don't use this to store your life's savings, or anything unless you understand the risks. Who knows, maybe it will inspire the next person build something cool in a further direction.<p>I like it. The design is pretty swell too. Good job.
Why would the receiving party trust that they are receiving the amount promised? The paper itself holds no value, and as clearly both the "buyer" and "seller" are privy to the wallet access code, the "buyer" could simply put 0 BTC in the wallet, or remove it at a later date.
I have a hard time following the origami. After folding 1-2-3-4, I have a retangular cube. How am I supposed to accomplish fold #5? Sorry for being dense, not an origami guy. Anyone got a pic how how it's supposed to look like?
I can't help noting the irony in reverting to to paper cash; I figure it can only be a matter of time before I see a case titled 'United States vs. 2633.5 Bitcoins.'
Yeah, I love the web and webapps, but generating paper wallets is still something I prefer to do with a native app running in Tails or something similarly secure to avoid eavesdropping or other leakage of the private key.