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I'd like to print many paper wallets which have bitcoins in them. Are there any tools for it?

There are many paper wallet tools which can create and print one paper wallet.

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If you use bitaddress.org, click on paper wallets, you can hide art and generate and print 7 per page on standard paper or 3 per page with art - up to the amount you need. You would then need to xfer btc to these new accounts AFTER printing though. For extra security, you could also use this bitaddress.org solution on a computer with no internet. Just save the entire webpage to a thumbdrive and run it from the non-connected computer. Hope this helps.

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I would never use a online-computer to create a paper wallet. Also, I would never use a browser to generate a seed.

Have a look at: http://cryptographi.com

That looks like a neat project.

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  • You should substantiate that a bit further. window.crypto.getRandomValues() is not Math.random, and is a cryptographically secure way of fetching randoms from /dev/urandom / CryptGenRandom(). I concur with your statement on using a computer that is online.
    – Riaan Swart
    May 23, 2016 at 21:12
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    I'm not saying that javascript can't return a proper seed, but browsers had been an entrance for all types of malware during the last years. Why would you use a browser to generate a seed?
    – Jonas Schnelli
    May 24, 2016 at 13:41
  • Are you being serious? I'm seriously shocked that a Bitcoin Core developer is incapable of understanding why this is a good idea, given the adversarial landscape we're in. Being able to check both the hash of the downloaded file, as well as visually look through the JavaScript for weirdness, puts it one step above even Gitian-signed binaries (which is effectively trusting a small group of hopefully-trustworthy-individuals).
    – Riaan Swart
    May 24, 2016 at 18:38
  • Which means we're left looking at the attack surface a browser represents. Yes, attacks like XSS exist, but they are trivial to defend against in this instance, and always require you to have the malicious tab / window open. If the machine is offline what other possible vectors are there? Bitaddress and similar don't require Flash or anything like that, and they pass the RNG work straight to the OS.
    – Riaan Swart
    May 24, 2016 at 18:42
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    Stuff like this: landing2.trusteer.com/sites/default/files/… and this: dl.packetstormsecurity.net/papers/general/… make me think that you are wrong. I could imaging that there are serval attack vectors where a tab or browser window in the background could attack/read the PRNG. Maybe even a app (Chrome app) in the background.
    – Jonas Schnelli
    May 24, 2016 at 19:29

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