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Author Topic: Coin Armor - steel cryptocurrency wallet  (Read 380 times)
Anna Landik
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January 04, 2018, 03:32:06 PM
 #1

Hi there. New to this forum, but ain't a newbie in crypto world.
I'm trying to popularize the idea of investment in cryptocurrency among small households.

And immediately after newcomer buy his first digital coin you need to decide- where to store it?
We propose to store it on a cold wallet that can be made by me in a form of steel card:
https://i.imgur.com/SXgEUb0.jpg

If you like the  idea - please check the description of our project on Kickstarter.com:
https://www.kickstarter.com/projects/437309334/coin-armor-steel-cryptocurrency-wallet

and support us  Grin
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January 05, 2018, 02:22:45 AM
 #2

Interesting idea, I like it!

What happens if the kickstarter doesn't fully fund? Would you still produce them for buyers here on the forums?
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January 05, 2018, 03:29:25 AM
 #3

Cool idea, and great use of BIP38 to get around the issue of you also having the private key...  I'm in for 3!  Wink  Will you print different icons on them depending on the token choice?  Like if I want a ZEC one, I'm assuming you'll print the Zcash logo on it?  Also, how are you etching them?  I also have a CO2 laser cutter, so I'm assuming you're treating them first with a coating, then that's actually making the marking (similar to dealing with anodized aluminum)... Do you have any issues with it scratching off?
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January 05, 2018, 06:22:03 AM
 #4

How safe is the wallet if or when released? Obviously, using this wallet would mean trusting the wallet's developer or creator. And, most importantly, being convinced that such wallets are at no risk of being accessed via a backdoor system.

I love the idea of engraving both the public and private keys on the card, protected by a passphrase-protected Bitcoin private key. Is it really secure? I mean is there any way to reverse engineer the encoding in any way? Sorry for asking. Just paranoid about these things. I always believe that a private key, encrypted or not and in whichever format it is generated, is only secure if it is known to and controlled by the wallet's owner and nobody else.

If it is really secure and impenetrable, I would love to have one of these cards and will be happy to support the Kickstarter. I do want to see the earlier question answered: what if the project fails to achieve full funding? Would you still move forward with it?


Anna Landik
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January 05, 2018, 07:32:16 AM
 #5

Cool idea, and great use of BIP38 to get around the issue of you also having the private key...  I'm in for 3!  Wink  Will you print different icons on them depending on the token choice?  Like if I want a ZEC one, I'm assuming you'll print the Zcash logo on it?  Also, how are you etching them?  I also have a CO2 laser cutter, so I'm assuming you're treating them first with a coating, then that's actually making the marking (similar to dealing with anodized aluminum)... Do you have any issues with it scratching off?

Hi Markaz. Sure logo depends on currency. I have a fiber laser, not CO2. Engraving is very deep ( about 0.2 mm) so I don't need coating and don't have a problems with scratching.
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January 05, 2018, 07:38:53 AM
 #6

How safe is the wallet if or when released? Obviously, using this wallet would mean trusting the wallet's developer or creator. And, most importantly, being convinced that such wallets are at no risk of being accessed via a backdoor system.

I love the idea of engraving both the public and private keys on the card, protected by a passphrase-protected Bitcoin private key. Is it really secure? I mean is there any way to reverse engineer the encoding in any way? Sorry for asking. Just paranoid about these things. I always believe that a private key, encrypted or not and in whichever format it is generated, is only secure if it is known to and controlled by the wallet's owner and nobody else.

If it is really secure and impenetrable, I would love to have one of these cards and will be happy to support the Kickstarter. I do want to see the earlier question answered: what if the project fails to achieve full funding? Would you still move forward with it?



It is as safe as BIP38 encoding. I will not know your passphrase and will not know how to encode your password and gain access to your coins. And BIP38 for now is among most advanced and safe algorithms.
If KS funding will fail I will not produce those cards. Guys, frankly speaking that project is not about profit. It's about advertisment of cryptoworld to new people and helping to solve problems with security for long term storage.
So I still hope you'll support me Wink
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January 05, 2018, 04:58:40 PM
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How safe is the wallet if or when released? Obviously, using this wallet would mean trusting the wallet's developer or creator. And, most importantly, being convinced that such wallets are at no risk of being accessed via a backdoor system.

As the poster said, BIP38 is the key to this - when I first say it I thought the same thing, just another version of one of those coins people used to make back in the day that had their private key printed on them... And when I saw the private key printed on the BACK of the card, I was like "Good lord this is the mother of bad ideas!"  But then I read further and saw the BIP38 part, and realized how they were doing things, and really it's as secure as whatever pass phrase you use to encrypt the private key - so a great solution.

And very cool about the fiber laser, I wish I had the coin to get one of those bad boys, but it's hard to justify when I just play around with mine for fun.  I'll have to wait for the wazer before I can start destroying metal like you. Wink
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January 05, 2018, 09:53:54 PM
 #8

Yep. People are shouting Scam! Scam! all time on forums. Need to explain about pass-phrase protection over and over again Wink
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January 08, 2018, 03:29:15 PM
 #9

In for 3 Titanium! I'd really like to see this make it into production.
Anna Landik
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January 09, 2018, 12:16:17 PM
 #10

Thanks Olaf! Really appreciate that.
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January 09, 2018, 06:26:40 PM
 #11

Interesting concept honestly, but my question comes down to the passphrase. How would they know How would the private key be encoded with a second passphrase and only they (the customer) would know it?
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January 10, 2018, 11:15:23 AM
 #12

Interesting concept honestly, but my question comes down to the passphrase. How would they know How would the private key be encoded with a second passphrase and only they (the customer) would know it?

Hi. We recommend to use this service https://walletgenerator.net to generate Crypto address and pass-phrase protected private key. Please try to generate paper wallet and hit checkbox "BIP38 Encrypt?". After that you need to enter passphrase that will be needed to encode your key. And nobody except you will know that passphrase.
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January 10, 2018, 11:23:11 AM
 #13

How safe is the wallet if or when released? Obviously, using this wallet would mean trusting the wallet's developer or creator. And, most importantly, being convinced that such wallets are at no risk of being accessed via a backdoor system.

I love the idea of engraving both the public and private keys on the card, protected by a passphrase-protected Bitcoin private key. Is it really secure?
This thread gives a good idea of how strong BIP38 encryption is: I'm BIP38 curious, please help me out!.
In short: password zLwMiR was not cracked in 2 years for a 1 BTC (more than $1000 at the time) prize. It would cost more in computing power than it's worth.

I can think of one scenario to crack it though: suppose a hacker has access to a botnet of a million computers, that would give him enough computing power to crack this password without high cost.
This can of course easily be prevented by using a longer password.

That being said, I'd still have a very hard time trusting anyone with my BIP38 encrypted private key. It feels scary, even though the math says it's okay.

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January 10, 2018, 11:00:48 PM
 #14

this looks really cool  Grin
is it possible not to print the private key on the back and just print the bitcoin logo instead?
also how much is the shipping to the UK?

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January 11, 2018, 06:51:30 AM
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Great idea best of luck with the campaign looks like you will hit your target soon
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January 12, 2018, 06:27:49 AM
 #16

The wallet does seem good and is nothing new tbh
I have had such wallets before but never in steel

How safe are these to everyday friction in our wallet and card cases? How long till the BIP38 privkey printed on it starts to fade a little? Well, that can be dealt with

I would be interested in 2 of these but i want some addition to my card, something that would even hide my BIP38 privkey, why risk it by showing and give others a chance to bruteforce?

Do you have any innovative idea to hide the BIP38 privkey as well? i would love to see something innovative
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January 12, 2018, 06:35:09 AM
 #17

The wallet does seem good and is nothing new tbh
I have had such wallets before but never in steel

How safe are these to everyday friction in our wallet and card cases? How long till the BIP38 privkey printed on it starts to fade a little? Well, that can be dealt with

I would be interested in 2 of these but i want some addition to my card, something that would even hide my BIP38 privkey, why risk it by showing and give others a chance to bruteforce?

Do you have any innovative idea to hide the BIP38 privkey as well? i would love to see something innovative

They are laser engraved. Friction and day to day use wouldnt make a dent in it. If the steele is good quality this would last a very long time. Besides how often are you gonna take it out to use the QR code there are very few places that accept Bitcoin face to face
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January 12, 2018, 04:13:14 PM
 #18

I got excited this morning when I looked and saw the project 100% funded, I can't wait to get these! I pledged for 3 titanium, now I have to decide which wallets they will be Cheesy
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January 12, 2018, 05:33:02 PM
 #19

The wallet does seem good and is nothing new tbh
I have had such wallets before but never in steel

How safe are these to everyday friction in our wallet and card cases? How long till the BIP38 privkey printed on it starts to fade a little? Well, that can be dealt with

I would be interested in 2 of these but i want some addition to my card, something that would even hide my BIP38 privkey, why risk it by showing and give others a chance to bruteforce?

Do you have any innovative idea to hide the BIP38 privkey as well? i would love to see something innovative

They are laser engraved. Friction and day to day use wouldnt make a dent in it. If the steele is good quality this would last a very long time. Besides how often are you gonna take it out to use the QR code there are very few places that accept Bitcoin face to face

Well, given i will opt for a good vanitygen address, and how i am planning to use this to show and help people understand cryptocurrency. It would be more of a sample type of thing to show some security aspects so will be used alot but i understand the laser engraving
Still waiting for OP to tell about hiding BIP38 key
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January 12, 2018, 05:56:13 PM
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The wallet does seem good and is nothing new tbh
I have had such wallets before but never in steel

How safe are these to everyday friction in our wallet and card cases? How long till the BIP38 privkey printed on it starts to fade a little? Well, that can be dealt with

I would be interested in 2 of these but i want some addition to my card, something that would even hide my BIP38 privkey, why risk it by showing and give others a chance to bruteforce?

Do you have any innovative idea to hide the BIP38 privkey as well? i would love to see something innovative

They are laser engraved. Friction and day to day use wouldnt make a dent in it. If the steele is good quality this would last a very long time. Besides how often are you gonna take it out to use the QR code there are very few places that accept Bitcoin face to face

Well, given i will opt for a good vanitygen address, and how i am planning to use this to show and help people understand cryptocurrency. It would be more of a sample type of thing to show some security aspects so will be used alot but i understand the laser engraving
Still waiting for OP to tell about hiding BIP38 key

Agree, tremendous trust has to be placed on the cardmaker with regards to the BIPP32 Private key , how its generated and last but not least how it is handled and by whom.

 How is this being worked on? Will the private keys be destroyed and no traces left when sold?

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