Nonce
A "number used once" — in blockchain, a nonce serves two purposes: in mining, it's the value miners iterate to find a valid block hash; in transactions, it's a sequential counter preventing replay attacks and ensuring transaction ordering.
A "number used once" — in blockchain, a nonce serves two purposes: in mining, it's the value miners iterate to find a valid block hash; in transactions, it's a sequential counter preventing replay attacks and ensuring transaction ordering.