Keypair cards now available through Bitbills!

[enmaku]

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

[1713296415]

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[phillipsjk]

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.

[cypherdoc]

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

[amincd]

This is awesome!

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.

[phillipsjk]

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]

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.

[Noitev]

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.

[Noitev]

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

[SgtSpike]

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

[Ryland R. Taylor-Almanza]

Awesome! I can't wait!

[Noitev]

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

[SgtSpike]

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!

[bcearl]

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!).

[Ryland R. Taylor-Almanza]

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?

[Trader Steve]

Looking forward to see how they turn out!

[Sandoz]

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

[phillipsjk]

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

[cypherdoc]

i already have a secure key pair.

i suppose i could just order the public key half for my card?

[Noitev]

i already have a secure key pair.

i suppose i could just order the public key half for my card?

to clarify

SOON I will have 2 cards, 1 private one public

This is a limited release since people asked for cards with just an address already on their wallets.

I got a shipment of gold colored credit card sized usb drives with 1gb capacity.

you send me an address or a design and ill engrave it. this is just a demo to see how the engraver works, honestly idk how well they will engrave on these cards but we'll see

[Sandoz]

Just a question: how easily can the QR codes be scanned if they are etched and appear white (instead of a high-contrast black and white)?

I tried to scan the QR on the photo of your prototype but the QR apps I usually use would not recognize it...