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1  Bitcoin / Hardware / DIY water block to suit Klondike K16 and Burnins 20 (Bitburner?) on: May 25, 2013, 01:08:10 PM
Water cooling block for multiple boards

I am going to make a single water cooling block to cool either 30 Burnin or 38 Klondike K16 boards.
The strategy is to keep it simple KISS and use off the shelf parts. This is not built yet so any suggestions welcome.

The preliminary plans and CAD drawings below is for a 10 x Burnin board water block (for 30 board size it will be 3 x the length)
Aluminum rectangular tube 200mm x 50mm x 600mm x wall thickness 3mm
Aluminum flat bar (x2) 160mm x 560mm x 3mm
Aluminum flat bar (x2) 50mm x 200mm x 3mm
Aluminum weld in hose fitting (x2) TBA
Heat sink compound TBA
Heat transfer insulator TBA
Aluminum mesh 10-20mm mesh size.

End plates fully welded both ends of rectangular tube to make waterproof and then pressure tested - TIG weld.
Heat sink plates to be tack welded in place on both sides of rectangular tube - TIG weld

Heat sink materials
The plan is to put a heat sink compound between the pre-drilled and tapped heat sink plate and aluminum sq tube.
Heat transfer insulator material TIM between the plate and the boards. At this stage I have no idea what i am going to use and any suggestions would be welcome.

CAD files
I will post the CAD files when complete.

This is a consolidation of discussions in threads here and here.
Mesh will be stuffed into the aluminum sq tube to increase surface area and create turbulence.

Concept drawing

Heat sink plate render - fit Burning board

Heat sink plate CAD

Aluminum tube render

End plate render

2  Bitcoin / Hardware / Sydney - Klondike assembly EOI on: May 20, 2013, 08:44:39 AM

Klondike assembly EOI

I am looking to get around 37 Klondike boards professionally assembled in Sydney. At this stage I will be waiting on the final PCB design and BOM so I can get quotes.

If you are interested in adding to my possible order please post. The larger the run the cheaper it is.

I used to work in the smd assembly industry, admittedly that was a long time ago but it does mean I am comfortable getting this done.
3  Bitcoin / Wallet software / android wallet to webcam client? on: January 20, 2012, 05:12:24 PM

I am still fairly new to BTC so please forgive me if this has been suggested before. My concern is having my BTC secure and easy to use without the headache of use a bootable usb or worry about malware trojans etc.

1. Cheap $50 android pad, no web access ,app that has your private keys and can do transactions (suitably backed up).
2. PC with webcam and a client that keeps track of your transactions plus internet.

Step 1. Display your beneficiaries QR code on the PC's monitor.
Step 2. Use android pad to scan QR code.
Step 3. Carry out transaction and display resulting QR code on pad's screen.
Step 4. Scan Android pad's screen using PC's webcam
Step 5. Client on PC sends transaction to the net.
The only communication to the web by the device holding the private keys is via QR code so should be petty much hacker proof.
The inconvenience factor is relativity small in light of other methods such as booting the PC off a USB OS.

What do you think? And better still where can I get the software needed ready made Cheesy

4  Other / Beginners & Help / unhackable wallet concept on: January 01, 2012, 04:41:04 AM
I have been reading up and there appears to be a lot of concern about wallet security against thieves and trojans. There seems to be a lot of methods for making your wallet more secure and most are a PIA.

I have an idea using hardware but do not know how feasible it would be....I am hoping those with more experience might comment on it.

| usb plug |------| PIC |-----| memory |-----| micro usb socket |
                     | button |

The idea is to have a usb stick with a micro processor built in such as a PIC. The key data is stored in memory only directly accessible via the mico usb slot.

1. Store all primary keys on memory via micro usb socket (one time only with precautions)
2. plug into PC via usb plug
3. the client sends key data to PIC (recipient key, amount and number of primary key needed)
4. PIC relays same data back to client for verification
5. User presses button for PIC to generate new key off the selected primary key and send result back to client.
6. Client now has payment data and at no time did it have access to any primary key.

As the PC has no access to the primary keys and physical access is needed to generate a pair I don't see how a hacker could steal money.....unless i am missing something.

What do you think?
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