edit: Meuh6879, you didn't understand the question.
Offline wallet ... offline ?!?
You can not emit transactions with an offline thing (harware wallet are connected to internet to emit transaction ... script from an extension at minimal level).
COLD Storage is a backup of a wallet ... not an offline thing.
You NEED an online software (local or others) to use the COLD Storage wallet and emit transactions.
"Cold storage in the context of Bitcoin refers to keeping a reserve of Bitcoins
offline. This is often a necessary security precaution, especially dealing with large amounts of Bitcoin."
@Kprawn
Buying a second hand computer to create an offline address is not very secure.
Here is a good guide that I wrote a while ago:
https://bitcointalk.org/index.php?topic=1559277.msg16944426#msg16944426I do it like this:
- Download the latest Tails OS:
https://tails.boum.org/index.en.html- Download latest Bitcoin Core:
https://bitcoin.org/en/choose-your-wallet- Download the latest GPG4USB:
https://www.gpg4usb.org/download.htmlVerify the downloads, burn Tails on DVD, put Bitcoin Core and GPG4USB on a clean USB
then
1. Start a computer with the TailsOS (Higher sec: randomly buy a new and packed computer and USB stick for that) and disable your network and WLAN card.
2. Start GPG4USB and create a new keypair with a strong password. Export your GPG private key and save the file on your USB
3. Start Bitcoin core and create a new wallet. Copy the public wallet address to a textfile and save it on your USB (or write it down, if you don't want your public address being digitalized). Encrypt the wallet within Bitcoin Core with another password.
4. Encrypt the ~/.bitcoin/wallet.dat file with your new GPG keypair and copy the GPG encrypted file to the USB stick. Check back, if you can decrypt both, Bitcoin wallet and GPG file. Always remember: If you later lose your wallet file and/or can't remember your passwords, you lose everything in that wallet.
5. Shutdown
You can now send funds to the public address of your offline wallet.
You better make tests with small amounts to make sure everything is working, before you lose everything.