Ethereum has proven its usefulness several times in the past few years through successful applications, and has already disrupted some business models. One of the most interesting ones is slock.it (https://slock.it/). This is an application founded by Stephan Tual and the Jentzsch brothers in 2015, aiming to create an infrastructure for a better sharing economy.
Using Ethereum's blockchain, slock.it is willing to link any kind of physical object to a smart contract to allow anybody to use the object. An example often used by the founders is the renting of a flat. With slock.it, you can link your door lock to a smart contract, enabling someone who wants to rent your flat to pay the price linked to the smart contract, which will automatically unlock the door. This setup eliminates a trusted third party that you would usually have to...