The concept of BTCU is similar to the concept of the second cryptocurrency by capitalization - Ethereum. Like Ethereum, the Bitcoin Ultimatum blockchain provides smart contracts in the blockchain protocol as one of the important functions for the implementation of transactions and DAPP applications. The BTCU team sets itself the task of developing the direction of smart contracts and implementing atomic swap technology natively to the blockchain protocol to allow carry out transactions not only within the framework of a single blockchain protocol, but also to conclude smart contracts interacting with other protocols, which will globally expand the possibilities of this technology.