Keypair cards now available through Bitbills! - page 2.

phillipsjk

legendary

Activity: 1008

Merit: 1001

Let the chips fall where they may.

Quote from: bcearl on July 01, 2011, 03:13:36 AM

How do I know that my engraved key pair is secret?

I will stay with pen and paper (I wouldn't even trust a printer that much!).

I trust all my printers with less than 1 MB or memory

Sandoz

member

Activity: 85

Merit: 10

I love the idea and will definitely order a set BUT there is something I don't understand:

1) The intended use is for an off-the-internet life savings account, right?
2) But as you potentially have the keys for that I cannot trust it to hold my life savings (nothing against you, I think it's just a common sense precaution)

If I got that wrong and it's just for holding a few bucks, then it's more for showing off and probably don't need the private key card as you often use the account anyways..

Is there some safe way you could create those cards without you keeping the private key? Maybe provide you with an encrypted version you would then engrave?

Just wondering.. I want that set, but I also want it to have real practical use

Trader Steve

hero member

Activity: 836

Merit: 1007

"How do you eat an elephant? One bit at a time..."

Looking forward to see how they turn out!

Ryland R. Taylor-Almanza

legendary

Activity: 882

Merit: 1001

Quote from: Noitev on July 01, 2011, 01:43:17 AM

Quote from: SgtSpike on June 30, 2011, 11:23:32 PM

Clarification: Is that for two cards (one with private key and one with bitcoin address) or just one?

This is a special release. you get 1 card witha n address alreay on your wallet engraved, or whatever else really on a gold metal credit card shaped usb drive with 1 gb capacity

Wait, gold? You mean it's colored gold, right? Not actual gold?

bcearl

full member

Activity: 168

Merit: 103

How do I know that my engraved key pair is secret?

I will stay with pen and paper (I wouldn't even trust a printer that much!).

SgtSpike

legendary

Activity: 1400

Merit: 1005

Quote from: Noitev on July 01, 2011, 01:43:17 AM

Quote from: SgtSpike on June 30, 2011, 11:23:32 PM

Clarification: Is that for two cards (one with private key and one with bitcoin address) or just one?

This is a special release. you get 1 card witha n address alreay on your wallet engraved, or whatever else really on a gold metal credit card shaped usb drive with 1 gb capacity

DEFINITELY count me in for one then!

Thanks!

Noitev

hero member

Activity: 812

Merit: 505

The Last NXT Founder

Quote from: SgtSpike on June 30, 2011, 11:23:32 PM

Clarification: Is that for two cards (one with private key and one with bitcoin address) or just one?

This is a special release. you get 1 card witha n address alreay on your wallet engraved, or whatever else really on a gold metal credit card shaped usb drive with 1 gb capacity

Ryland R. Taylor-Almanza

legendary

Activity: 882

Merit: 1001

Awesome! I can't wait!

SgtSpike

legendary

Activity: 1400

Merit: 1005

Clarification: Is that for two cards (one with private key and one with bitcoin address) or just one?

Noitev

hero member

Activity: 812

Merit: 505

The Last NXT Founder

The engraver should be here tomorrow and I have 14 Gold metal USB drive business card I'm gonna test it on befire doing anything else, once i try one, i'll sell it to you with anything you want, whether it be a qr code, design, etc for 2btc. capactiy is 1gb

Noitev

hero member

Activity: 812

Merit: 505

The Last NXT Founder

Quote from: cypherdoc on June 30, 2011, 12:26:19 AM

i don't get it. why wouldn't FirstBits be better?

Because its entirely offline. This is more to secure coins from computer hacking, etc.

amincd

hero member

Activity: 772

Merit: 501

You are notified that it has been broadcasted immediately, as the incoming transaction shows up on your client as unconfirmed. Your client then broadcasts to the rest of the network. The risk is that the stranger then immediately spends the same bitcoins again, and that subsequent spend becomes confirmed, while the ones you thought you received are not transferred to you. I believe that if the first transaction has a head start on the second one though, the chance that the second one will end up as the confirmed one is very low.

phillipsjk

legendary

Activity: 1008

Merit: 1001

Let the chips fall where they may.

Yes, but if strangers are using their own untrusted smartphones for making the payment, I as a merchant would want to make sure the transaction is at least broadcasted.

I didn't really think my objection through anyway: the merchant also needs some way to know whom just broadcasted a payment as well. One way is to give each individual their own address, which would not work in this case. Could still work as a "drop box" for a bitcoin cash register though.

Edit: "Drop box" opens door to disgruntled employee scanning their own address. Better to have the bitcoin register just "know" the "drop box" address.

amincd

hero member

Activity: 772

Merit: 501

This is awesome!

Quote from: phillipsjk

The ~10 minute delay for confirmations may be awkward though

I don't think you need to actually wait for any confirmations for transactions that don't involve large transfers of value. It's only for cases where you think the person has the computational means to pull off a double spend attack that you would need some confirmations to be sure the transaction won't be reversed.

cypherdoc

legendary

Activity: 1764

Merit: 1002

i don't get it. why wouldn't FirstBits be better?

phillipsjk

legendary

Activity: 1008

Merit: 1001

Let the chips fall where they may.

This may be of use in Point-Of-Sale applications: Public address is pasted on counter, private key is kept in a safe and emptied out every night.

The ~10 minute delay for confirmations may be awkward though.

enmaku

hero member

Activity: 742

Merit: 500

If you're keeping a list or something of interested customers, add me to it

Noitev

hero member

Activity: 812

Merit: 505

The Last NXT Founder

Quote from: phillipsjk on June 29, 2011, 12:28:39 AM

Would the wax or plastic over the private key be tamper-evident? What happens when I shine infra-red light on it?

I think the engraving would be too durable and clear to securely store the private key.

I think you guys are missing the message.

The picture is a prototype, the finished product will have 2 linked cards. 1 public and a separate card that's private.

netrin

sr. member

Activity: 322

Merit: 251

FirstBits: 168Bc

Quote from: SgtSpike on June 28, 2011, 09:51:28 PM

I still don't get it.

You'd never have to expose any private keys (beyond having them in your wallet). Just pick an address that your wallet generates, then make a QR code out of it and use that for a tattoo.

It would be nice if our wallets were separated individually into the addresses and the private keys in digital form. The OP is engraving the private key (minimal wallet), hidden under tamper-evident gunk, with a lovely address line in plaintext and luxurious QR.

(I pondered similar ideas for Father's Day, but...)

Why?

phillipsjk

legendary

Activity: 1008

Merit: 1001

Let the chips fall where they may.

Would the wax or plastic over the private key be tamper-evident? What happens when I shine infra-red light on it?

I think the engraving would be too durable and clear to securely store the private key.

Topic: Keypair cards now available through Bitbills! - page 2. (Read 6770 times)