Upvote:1
The most normal "proof of assets" are statement from a bank or other investment accounts. The intention is to show that you have enough money to be able to afford the trip you are going to make. If you can do that by just providing financial statements that will be fine. If you can't showing you own a house will not help much, as hardly anybody will sell their house in order to take a vacation.
Proving you own a house does establish ties to your country - for that reason it may be worth including a deed, but the precise value is probably not important.