How does it
Crypto assets only exist on the blockchain. The only way they can be accessed and used is by knowing the private key associated with the address that the blockchain says is the owner of the assets.
When you buy crypto assets, you don’t download or hold them as a file on your own device — you hold the assets in a digital address on a blockchain. Wallets are technologies or products that help you manage the keys associated with your assets on the blockchain.
Your digital wallet comes with an assigned public key and a private key, which are comprised of a string of letters and numbers.