Valid & Invalid transactions

Selling a vehicle or property if one does not have the logbook or title deeds in one's possession

Q: 

1. A dealer purchases cars from auctions. Payment is made for these vehicles and the dealer has possession of the vehicle. However, the auctioneers generally delay paperwork and release the logbook, etc. months later. Can the dealer sell the cars before receiving paperwork? 

2. A person purchases a property but does not have the title deed as yet. It is still being processed with the master's office. Is he considered as the owner? Can he sell the property? Can he rent out the property and receive rentals?

Selling various products via Whatsapp or a website

Q: 

1. I sell products from my business website. My supplier has 200 products. I stock 100 items but list all 200 items on the website stating 'available on order'. The customer purchases and pays for the item and I then order and ship it to the customer. Is this permissible? 

2. I post items on my WhatsApp for sale... Customers know I don't have the product. The supplier has numerous agents like myself who advertise and purchase according to order. Customers place orders and once I receive the item, they pick up and pay. Is this permissible or how can this be structured in a permissible manner?

Trading on a crypto exchange group

Q: I have a question about a certain crypto exchange group called “mega”. Basically it’s a group that trades in a platform called “2139 exchange”. Me and my friends group joined this group because we did our research and we didn’t find anything haraam concerning it. But now I’m having some doubts. 

Basically a certain individual studies the market and predicts the direction of a certain currency and makes profits through the price fluctuations. The participants can join the trade through a futures feature and get a profit but he takes a percentage also when the participants withdraw their profits he also takes a percentage. So I want to know if it’s halaal or haraam because I heard some people saying it’s like gambling. 

Businessman preventing two people from transacting a sale on his property

Q: Could mufti advise on the following: 

Person A owns a Cash n Carry, person B and person C both are his customer's and purchase from him. At the premises of person A, person B and C meet and start transacting on person A's premises. Person A in turns tells Person B that person C is my customer and you cannot supply him. 

1. Is this type of clause permissable in shariah where person A stops person B from supplying person C as he feels it's his customer. 

2. If person B and C transacted on person A's property, is the sale valid.