Internal logs, labels, change addresses, and key pools.
From scanning public datasets and breach logs, security researchers have identified three recurring stories behind exposed wallet.dat files: indexofbitcoinwalletdat
device, you should check these default paths rather than searching the public internet: %APPDATA%\Bitcoin\ , and look for wallet.dat ~/Library/Application Support/Bitcoin/ : Check the hidden directory ~/.bitcoin/ Are you trying to recover a lost wallet of your own, or are you interested in server security and how to prevent these files from being exposed? Internal logs, labels, change addresses, and key pools
If you discover that your wallet.dat has been exposed or suspect it has been compromised: It contains structural database tables governed by Berkeley
A wallet.dat file is the literal "key to the vault" for a Bitcoin Core node. It contains structural database tables governed by Berkeley DB (BDB) or SQLite (in newer versions):
This file is critically important because it holds the keys to your bitcoin. The official Bitcoin Core data directory — typically %APPDATA%\Bitcoin on Windows, ~/Library/Application Support/Bitcoin on macOS, or ~/.bitcoin on Linux — contains wallet.dat by default.