Cold wallet creation tutorial: Mobile phone cold wallet creation tutorial: https://youtu.be/MkqgQA6lcII?si=qj3XsgCn515JWaG5 and bitcoin core full node wallet, use it to save handling fees, disconnect from the network to create a wallet, then back up and export the private key and save it For the private key, you can go to the so-called official website of Bitcoin, or you can go to https://bitcoin.vtegn.com. The cold wallet is one that has not been connected to the Internet. If you want to transfer out, you need to transfer it all at once and then use it. A wallet address or purchase a hardware wallet. $BTC #BTC