Suppose I'm stuck in the middle of nowhere with no internet access and I want to make a payment to a certain Bitcoin address.
Is it possible to do a transfer via postal mail, and if so what information would I need to send?
Assume the following:
- I have both the recipient's Bitcoin address and my (the sender's) own private key(s) memorized or written down on a piece of paper.
- The person who receives the mail (my agent) has access to the Bitcoin network and will act on my behalf.
- The mail is delivered securely (i.e. no chance of theft)
What information would I need to send in the mail?
Consider the following possibilities:
- I trust my agent to do the transfer to the given address (e.g. the agent is the recipient), but I can't trust my agent with my private key(s)
- I trust my agent with all my information (private keys and all)
- I do not trust my agent at all
B) Access to a computer
- I have access to a computer, so I can run any program/scripts that may be required for generating any signatures
- I don't have access to a computer (and I'm not Rain Man)