In 2021, a significant number of cryptocurrency holders lost their assets not through complex hacks, but through simple misconfigurations. One of the most common—and avoidable—leaks involved the indexofwalletdat search string.
wallet.dat is the default filename for the wallet file used by Bitcoin Core and many other "UTXO-based" cryptocurrencies (such as Litecoin, Bitcoin Cash, and Dogecoin). This file contains the user's private keys, public keys, and transaction metadata.
: Use a hardware wallet to keep your private keys entirely offline.