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I have a random private key (compressed or uncompressed) 5HpHagT65TZzG1QDbnQCzdudnpknN7nA1SLEt4ZcxsH2SV92yqt or KwDiBf89QgGbjEmUcXPRwPuKPFnFECvJkvovGNiyjaujMCrQXy98. How do I convert this private key back to an integer?

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Assuming the key is the posted compressed WIF KwDiBf89QgGbjEmUcXPRwPuKPFnFECvJkvovGNiyjaujMCrQXy98:

  1. Decode the key you have using the encoder used (in this case base-58)
    80-00000000000000000006f5d7d806edef2e1110b0b243f9a90c2aaaaaaaaaaaaa-01-098dbf37
  2. Remove the extra bytes (version byte, compressed byte if present, checksum)
    00000000000000000006f5d7d806edef2e1110b0b243f9a90c2aaaaaaaaaaaaa
  3. Take the remaining bytes (in this case it must be 32 bytes) and convert it to an integer assuming it is positive and in big-endian (most significant value is stored first).
    666666666666666666666666666666666666666666666666666666
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    @The Gripmaster you should also add that entering "private key" in a website is not a good idea. – Coding Enthusiast Sep 4 at 3:36

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