/// <summary>
/// Generates a new ID.
/// </summary>
/// <returns></returns>
public long Generate()
{
long ms = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
long state = Interlocked.Increment(ref this._state) & 0x07; // 3 bits of state
using var rng = new SecureRandom();
long differentiator = (rng.GetUInt8() & 0x0F) << 8; // 4 bits of differentiator
return((ms << 12) | differentiator | this._pid | state);
}