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Can anyone tell me the specified source code to make "checksum bits appended", before doing Base58 conversion? Thanks very much!!!!

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See src/base58.cpp Line 124:

std::string EncodeBase58Check(const std::vector<unsigned char>& vchIn)
{
    // add 4-byte hash check to the end
    std::vector<unsigned char> vch(vchIn);
    uint256 hash = Hash(vch.begin(), vch.end());
    vch.insert(vch.end(), (unsigned char*)&hash, (unsigned char*)&hash + 4);
    return EncodeBase58(vch);
}

As you can see, the data vch is hashed, then the first 4 bytes of the hash are appended to the end of vch before base58 encoding.

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