Short answer. An old wallet.dat file from Bitcoin Core can still hold coins. Copy it first, then load the copy in a current version of Bitcoin Core on an offline-capable machine, or extract the addresses to check balances on a block explorer. If the file is encrypted and you have forgotten the passphrase, recovery depends on how much of the passphrase you remember.
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Before you open it
Copy the file to two separate drives and keep the original untouched. Old wallet files can be damaged by opening them in newer software if something goes wrong.
Never upload a wallet.dat to a website that promises to 'check' or 'unlock' it. That is one of the most common ways people lose old coins.
Checking whether it holds anything
Current Bitcoin Core can load old wallet files. A full sync takes time and disk space, but it is the most reliable way to see the true balance.
Alternatively, technical users can extract the addresses from the file and look them up on a public block explorer without exposing any keys.
If the wallet is encrypted
Bitcoin Core wallets encrypted with a passphrase need that passphrase to spend. Recovery means testing passphrase candidates against the file, offline. It works when you remember the general shape of the passphrase.
- Write every phrase, word and number you might have used
- Note capitalization habits and common substitutions
- Think about the period you created it: old usernames, pets, addresses
Moving the coins safely
Once unlocked, send the coins to a new wallet created today, with a fresh seed phrase written on paper. Do not keep using a wallet file that has been copied many times.
Very old coins can carry forks, such as Bitcoin Cash from 2017. Claim those only after the bitcoin itself is safely moved, and only with reputable software.
FAQs
Can a corrupted wallet.dat be recovered?
Sometimes. Bitcoin Core includes salvage tools, and keys can occasionally be extracted from damaged files. Always work on a copy.
Do I need to download the whole blockchain?
To use Bitcoin Core fully, yes, though pruned mode reduces disk use. Checking addresses on a block explorer is a lighter first step.
Will I owe tax when I move old bitcoin?
Moving coins between your own wallets is not usually a sale, but selling them is. Ask a tax professional where you live.
Official sources