[IDEA] Plastic QR codes

[Stephen Gornick]

I believe the purchaser would just generate public addresses himself and keep his private key secret. All manufacturer need to know are public addresses after all.

Oh, I see.  You are going to produce these on-demand then.   That's going to be spendy.  When I read "very massive production" I figured there would be large batches of these made all at once.  Creating a handful of them, each one produced independently, are hugely different.

[TeslaUa]

Yes, apparently so. That makes me sad

[Phraust]

I had a similar idea a while back, here:

https://bitcointalk.org/index.php?topic=29102.msg366672#msg366672

Here is what I ended up with, printed in stainless steel via shapeways:




It's simply a bitcoin address as a QR code on the back, with the same address encoded around the rim in a raised barcode.  The initial idea was that you could either scan it to send payment (i filled the negative space in the QR code with paint, then polished it nice and smooth), or you could "sign" a document with the rim by using a stamp pad, rolling the rim in ink, then rolling the rim on paper.

3d Metal Printing leaves a little to be desired when it comes to resolution.  The QR code works fine, but the raised barcode doesn't.  I also printed it in high-detail clear here:




The detail is much much better, but it tends to be a bit fragile on the raised barcode.

[Jouke]

Wow, that coin looks awesome!

[Newar]

Now, THAT'S what I'm talking about!

[CoinLab]

We've thrown the idea of 3D printing phone cases with a QR code on the back.  If anyone has a 3D printer and is good at modelling , let us know!

[Phraust]

Here is the model, much better detail:

http://shpws.me/2s9G

We've thrown the idea of 3D printing phone cases with a QR code on the back.  If anyone has a 3D printer and is good at modelling , let us know!

Sadly, I don't have my own 3D printer...  yet.

[truckingeek]

That clear is gorgeous, have you access to a dual-nozzle unit with which you could fill in the negative parts of the QR with black?

I might have to splurge and get one myself, and start doing these on demand.  BTC0.20 sound about a fair price?

[Phraust]

That clear is gorgeous, have you access to a dual-nozzle unit with which you could fill in the negative parts of the QR with black?

I might have to splurge and get one myself, and start doing these on demand.  BTC0.20 sound about a fair price?

For the steel one I just used a syringe and some black acrylic paint to fill in the qr code, worked well enough.  but yeah, if I could get a good printer that could do multiple colors...