/// <summary>
        /// Adds an outpoint to the list of elements that will be used for building the filter.
        /// </summary>
        /// <param name="outpoint">The outpoint.</param>
        /// <returns>The updated filter builder instance.</returns>
        public GolombRiceFilterBuilder AddOutPoint(OutPoint outpoint)
        {
            if (outpoint == null)
            {
                throw new ArgumentNullException(nameof(outpoint));
            }

            MemoryStream ms = new MemoryStream(32 + 4);

            outpoint.ReadWrite(new BitcoinStream(ms, true));
            _values.Add(ms.ToArrayEfficient());
            return(this);
        }