http://walletdvl5avrmoxk2fwsf5b76zkmbkoo3r6kqeesq5hsgnq7xhbciad.onion/how-to-check-wallet.dat-is-real-or-fake
In old wallets, when creating a new address, several addresses are created and all of them are stored in a file, while the file size changes. 6. After accepting BIP32 (HD Wallet) a new bitcoin address is created for each payment, and the keys are stored in xpriv, and the file size does not change regardless of the number of addresses.