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Instead of using unknown software to "update" or "check" a key, use a reputable (like Blockchain.com or Mempool.space). Never enter your private key into a website.

Like your email password. If someone has this, they have full control over your account. Analyzing the "upd" and Specific Key String

Search only for the associated with that key. If you don't have the public address, you can derive it using offline, open-source tools like Ian Coleman’s Mnemonic Code Converter , but only if you are disconnected from the internet. Conclusion