Another example is rental, car’s ownership goes from Alice to Carol in a 2-of-2 transaction from Alice to Carol and locked transaction to return the car’s possession after a fixed time. Multi-party randomness: Alice sends a commitment to x to Bob, Bob sends y, Alice reveals x and the random number is x XOR y. This means that by the time someone calculates the hash, the blockchain would have advanced on one of the chains and then the hash of the block on the main chain counts.