Legal procedure?

A new client (from a referral) wants me to translate a book from French to English. The problem is, the client doesn’t want to pay upfront. He offered to give me a 50% recurring commission from the book’s sales. I like the offer as the book’s idea looks good and promising. I haven’t worked with this client before so I cannot totally trust him, especially that he’s living way too far to establish a physical contact. Are there any official legal precautions I can take to hold the client…

Legal procedure? ^(http://gauribhosale.com/goto/https://www.blackhatworld.com/seo/legal-procedure.1033164/)

A new client (from a referral) wants me to translate a book from French to English. The problem is, the client doesn’t want to pay upfront. He offered to give me a 50% recurring commission from the book’s sales. I like the offer as the book’s idea looks good and promising. I haven’t worked with this client before so I cannot totally trust him, especially that he’s living way too far to establish a physical contact. Are there any official legal precautions I can take to hold the client…

Legal procedure? ^(http://gauribhosale.com/goto/https://www.blackhatworld.com/seo/legal-procedure.1033164/)