//C++ TO C# CONVERTER WARNING: 'const' methods are not available in C#:
//ORIGINAL LINE: virtual bool checkIfSpent(const Crypto::KeyImage& keyImage) const = 0;
        public abstract bool checkIfSpent(Crypto.KeyImage keyImage);
//C++ TO C# CONVERTER WARNING: 'const' methods are not available in C#:
//ORIGINAL LINE: virtual bool checkIfSpent(const Crypto::KeyImage& keyImage, uint blockIndex) const = 0;
        public abstract bool checkIfSpent(Crypto.KeyImage keyImage, uint blockIndex);