I believe the questioner also knows that futures are as risky as stocks, even more dangerous than stocks. Futures can be wiped out, while stocks will not be wiped out as long as they don't borrow money.

Attach the basic knowledge of futures trading, and don't repeat it.

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The key is the sentence "He said he would give us money even if he lost money".

If you have the following two prerequisites, you can sign a contract with him boldly and confidently.

1) He has enough collateral on you, which is proportional to his valid real estate license, etc.

2) The rights and obligations of mortgage are stated in the contract, which is legal and effective after being appraised by lawyers.

-It's a practice of pawnshops.

Of course, you have to consider other risks, such as the possible depreciation of collateral (downward adjustment of house prices) and other factors.