If (and this is very much an "if") it really is the case that just an offer can be a binding contact, what happens if you make an offer to two parties in parall

If (and this is very much an "if") it really is the case that just an offer can be a binding contact, what happens if you make an offer to two parties in parallel, and both accept? Does the one who accepted later just not get the domain and noone can sue anyone? (no other option makes sense to me, there usually wouldn't really be any damages you could sue for either) If so, wouldn't it be possible to claim that you sold the domain to someone else for $5 before and get out of needing to sell it? How long does an offer stand? What if someone offered to sell 1 bitcoin for $100 10 years ago, would that offer be still standing and be required to be fulfilled?