On a USB drive or other storage media.
On a Paper wallet.
On a bearer item such as a physical bitcoin.
Use a offline Bitcoin Hardware wallet.

well everyone knows,.Satoshi Nakamoto is the creator of bitcoin, authored the bitcoin white paper, created and deployed bitcoin's original reference implementation.[1] As part of the implementation, they also devised the first blockchain database.

Master Node (Cryptocurrency)' Master nodes are full nodes that incentivize node operators to perform the core consensus functions of running a blockchain.