Bitcoin Core saves your private keys, address pool, and transaction history in the wallet.dat file. Its default location depends on your operating system:
As of April 2026, the primary "update" for this file involves migrating from the older format to the modern Descriptor format. 1. Why Update Your wallet.dat? bitcoin core walletdat upd
contain a rare but severe bug in the wallet migration process. Bitcoin Core wallet migration bug - GitHub Gist Bitcoin Core saves your private keys, address pool,