About 20% of the total Bitcoin supply is thought to have been lost, owing to discarded desktops and laptops, as well as stolen or misplaced keys
Bitcoin payments can be made with minimal or no fees, depending on the network congestion and the priority of the transaction
Bitcoins are stored in digital wallets that can be accessed with a private key, which is a number between one and ten thousand seven hundred seventy-seven
Losing wallets or private keys means loss of bitcoins, as there is no way to recover them without a backup