Get Private Key – Works with the Bitcoin Address Python library by converting compressed WIF to uncompressed WIF.

To convert a compressed WIF to an uncompressed WIF, you need to do the following:

1. Decode compressed WIF
2. Private key extraction
3. remove suffix
4. Recalculate checksum
5. Re-encode to Base58

One way this could be implemented is as follows:

def decompress_WIF(compressed_wif):
    hex_data = binascii.b2a_hex(base58.b58decode(compressed_wif)).decode()
    if len(hex_data) != 76:
        raise ValueError("Invalid length for a compressed WIF")
    prefix = hex_data(:2)
    suffix = hex_data(-10:-8)
    original_checksum = hex_data(-8:)
    xpriv = hex_data(2:-10)
    if suffix != "01":
        raise ValueError("The provided WIF is not a compressed key")
    if checksum(prefix + xpriv + suffix) != original_checksum:
        raise ValueError("Invalid checksum in the provided WIF")
    new_checksum = checksum(prefix + xpriv)
    uncompressed_wif = base58.b58encode(binascii.a2b_hex(prefix + xpriv + new_checksum)).decode()
    return uncompressed_wif

This code doesn’t check the version byte at all.