Topic: Bounty for Simple platform-independent solution to sign offline transactions? (Read 1560 times)

On an air-gap computer (meant to be a raspberry pi in the near future) that was never connected to Internet, following my own entropy scheme (using a 6-side dice and different easily auditable platform-independent / multi-platforms applications such as bitaddress.org), I have securely created different private keys for long-term deep cold storage bitcoin addresses - destined to hold not only my bitcoins but more importantly those of my family members and close friends (so I can't mess up).

So I am now looking for someone able to develop a highly secure, easily auditable, platform-independent (not based on electrum or armory) and evolutive solution to sign offline transactions from these cold storage addresses. The proposed offline signature solution must:

. Take into account that these cold storage addresses may sometimes be multisig addresses;
. Be easily upgradable as the Bitcoin protocol evolves.

The whole solution should be able to also be ported on raspberry pi running ubuntu or tails or similar.

Selection of the developer will be based on his capacity to demonstrate perfect understanding of the Bitcoin protocol and of my requirements - as well as to provide a simple, easily auditable, and evolutive solution. Bounty to be determined directly with the developer of the project.