Cryptocurrencies are hot. In our last post we talked about Bitcoin: it has the potential to change our world in many useful ways, but at a price. To keep its blockchain secure, Bitcoin requires as much energy to run as entire countries. In a world where climate change is a growing concern, people may start to ask questions.
In fact, there are a number of alternative technologies in development. An interesting example is IOTA, which is envisioned as a distributed ledger for the Internet of Things. It’s not based on a blockchain, but instead uses a Directed Acyclic Graph called the Tangle. So, what exacly is the Tangle, how will it allow payments between smart devices, and how is it different from a blockchain?