Crowdsourced deposit will be something like all the Berrytoken holders will be able to help a tenant by giving their tokens for the security deposits and they will get bonuses in tokens after the contract is finished. I think it will start after the tokenization system is in use. It's available in Rentberry's whitepaper and the proccess is described in Whitepaper, page 17. Link: https://cdn.rentberry.com/ico/downloads/Rentberry_Whitepaper_en.pdf