Was wondering if this is possible to do. Lets say Satoshi Nakamoto ended up prison in a foreign country and he was only able to communicate with the outside world by writing letters using only a pen and paper and being able to send it anywhere in the world. How can he sign a Bitcoin/Altcoin transaction using only pen and paper when he has memorized the following:
- A brain wallet address.
- Private Key
Now he would have to create a transaction and then sign it. And for him to broadcast the transaction, he would send it to someone while keeping his coins safe aswell. How can this be done using only pencil and paper?