IOTA’s distributed ledger, by contrast, does not consist of transactions grouped into blocks and stored in sequential chains, but as a stream of individual transactions entangled together.

In order to participate in this network, a participant simply needs to perform a small amount of computational work that verifies two previous transactions. Rather than creating a hierarchy of roles and responsibilities in the network, every actor has the same incentives and rewards. In order to make a transaction in the Tangle, two previous transactions must be validated with the reward for doing so being the validation of your own transaction by some subsequent transaction. With this 'pay-it-forward' system of validations, there is no need to offer financial rewards. Transacting with IOTA is and will always be completely fee-free.