In parallel with the current auction system, I propose an additional auction mechanism, Secret Bid Tender in Auction.
In this system, projects will make the highest dot bid to win a parachain slot. Offers will be confidential. Bids will be made one time. The project that makes the highest dot bid at the end of 1 week will win the parachain slot. Dots will not be locked for 2 years and will be returned to their owners immediately. Dots of losing projects will be burned.