Justchain is a decentralized platform that allows developers to quickly and easily create and launch smart contracts and decentralized applications (DApps). It is a first-level blockchain platform, which is being created to solve problems of scalability and transaction speed in blockchain networks. Justchain uses a combination of new technologies to provide high speed and low cost. In addition, Justchain uses a combination of the Proof of History (PoH) consensus protocol with the Proof of Authority (PoA) consensus protocol, which is an original approach that we will use to ensure the historical integrity of the blockchain, as well as increase the level of trust in authoritative nodes - Supernodes. This makes Justchain more environmentally friendly and efficient compared to other blockchain platforms that use, for example, Proof of Work (PoW).