I found an old paper wallet on an old computer of mine which is offline (I can count the number of coins with my fingers). I would like to distribute these coins now among 6-9 wallets (I want to give some family members coins) and have a few questions. Partially they are also out of curiousity, since I am learning more about bitcoin now that I have discovered the coins again.
1.) Is it safe if I create a raw transaction on the offline computer so I can execute it on my online computer?
2.) I read that making a transaction will reveal the public address of the current address. I also read that the signature of multiple transactions can help hackers to figure out my private key. It is therefore recommended to empty the old address when I move stuff around. Nevertheless, I am curious about the following:
However, wouldn't you say that the old address is still relatively secure after doing a single transaction? Meaning, while I should empty the old address at some point, a brute force attack would most likely not be able to hack the public key within a month of the transaction.
3.) If I send the bitcoins to multiple addresses in one multi-recipient transaction, will this raw transaction have a signature for each receiver? Or will I only sign with one signature (effectively the same as if I just moved money to one address)? Meaning, does an address become more exposed after a single multi-recipient transaction vs. a single one-recipient transaction?