Ask HN: Idea of a little simple lottery system with hash

I just came up with the idea of a little simple lottery system with hash.

{Time of purchase of lottery } + {lottery number} + {buyer id} +...

The above form is listed each time the buyer continues to be added, and the winner's lottery number is derived from the hashing value of the data.

I think it is difficult to manipulate because it does not require the reliability of any random number generator and because the participants provide random numbers.

I don't think the hardware resources will be big, and I think it's a pretty easy way to implement and for participants to verify, so can you give me some advice?