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MyEtherWallet · Keystore

MyEtherWallet: a keystore with no password, what can be tried

If you saved a file with a long name starting with UTC that looks inside like text full of letters and numbers, you have a keystore. It is your private key locked with your password. The good news: the file itself tells you how hard it will be to open.

October 2, 2026 · 5-minute read

What a keystore is, in one sentence

It is your private key inside a safe whose combination is your password. Nothing more and nothing less. There is no server, no account and nobody to appeal to: the file plus the password are the entire wallet. I go into it in what a keystore JSON is.

The value that decides your case

Inside the file there is a word that is usually scrypt or pbkdf2, with some numbers beside it. That describes how much effort a single password attempt costs. It is not a minor detail: it is the difference between testing millions of candidates a day or a few thousand.

  • With the light setting, a keystore works very well: if you remember the style of your password, the odds are good.
  • With the heavy setting, every attempt is expensive and only cases where you remember nearly the whole password succeed.
  • With no memory of the password at all, neither setting helps: there is nowhere to begin.
You can open the file in Notepad and look at that word with no risk at all: there is nothing inside that is useful to anyone without your password. Do it on a copy, though, and never paste it into a website or send it to a stranger.

The three mistakes I see in these cases

  1. Downloading it again «just in case» from a lookalike site. Fake copies of MyEtherWallet have existed since 2017. Put your file and password in there and the loss is immediate.
  2. Renaming or editing the file. Keep it exactly as it is. One changed character can make it useless.
  3. Confusing the keystore with the phrase. If you also have twelve words written down from that era, try them: you may not need the file at all.

What to gather if you want me to look

I don’t need your file or your password to tell you whether there is a case. The approximate year, what you remember about the password, and what that configuration word inside the file says is enough. With that I’ll tell you for free whether it is worth it — and if it isn’t, I’ll tell you that too.

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