31000 line of code is not a big task for any programmers because I am just a moderate level programmer and writing 1000 to 2000( or may be more then that ) line of code is daily time table so I think writing 31000 line for a revolutionary technology is not behind our imagination. its possible to do that may he had some assistance or if he was alone then also writing 31000 line would hardly 1 month and for logics and algorithms and testing I will give him 1 year to write those and I think its enough
I don't think he's saying that 31,000 lines is too much for a human; he's saying that it's not too much for a computer. With that aside, I don't think that there are AI's capable of writing that kind of complex code, especially when bitcoin was created in 2008. Do you know if there are code-writing AI's yet? Because I feel that logic itself is too complex for an AI to create even a fizzbuzz program, or something else simple.