IOST Partners With Polkadot for Cross-Chain Interoperability Breakthrough IOST has announced it is now at the final development stage for building a cross-chain transfer bridge to the Polkadot Ecosystem. The move is part of IOST’s plans to promote its cross-chain interoperability, bringing tremendous value for IOST users & developers and drive bigger adoption scenarios for its blockchain, according to a blog post on 5 March 2021.