The KEYPRESERVER is a bitcoin cold wallet intended for use with manually created keys. Entropy must be generated with dice (or other techniques), and entered into the keypreserver. The wallet address is then generated within the device ("air-gapped"). It is also possible to reconcile the existence of the private key from the public key without use of a computer ( reconciliation of inventory, warehousing, auditing ).
To bring the wallet from cold storage back onto a hot device may be done so using the QR WIF.
KP-01 revision 1 front image of PCB prior to fitting of rotary switches
KP-01 revision 1 reverse image of PCB (large chip is STM ARM Cortex-M3
about colddevices.com
I aim to bring a range of cold wallet devices to market for use with a variety of crypto assets. Serving primarily cold custody applications.