Founders: Arthur and Kathleen Breitman
Introduced: July 2017
This cryptocurrency had the largest ICO on record back when it was launched. Tezos uses a totally different system when it comes to protocol upgrades. There are rules that govern how stakeholders approve a change, which is then automatically deployed on the network. If one of the developers suggests a protocol upgrade, they can submit an invoice. If the protocol upgrade is approved – they get paid.