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I need to derive public key from my private key in uncompressed form. I know how to create compressed one with libbitcoin, but I can't find appropriate method for uncompressed form there.

Are there any other libraries in C++ which can do that?

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I don't know much about c++ or libbitcoin, but I found a public method in the bc::wallet::ec_public class

bool to_uncompressed(ec_uncompressed& out) const;

So I guess you can probably convert your ec_public to ec_uncompressed(which is just a byte_array) by

ec_uncompressed uncomp;
<public key>.to_uncompressed(uncomp);
std::cout << "Uncompressed: " << uncomp << std::endl;

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