Polkadot3 is an interchain project that connects different blockchains to enable smooth data transmission between the chains. Polkadot consists of a relay chain and a parachain. The relay chain serves as a central manager that decides whether to make transactions. The parachain serves as an auxiliary chain that collects and processes transactions. Polkadot has a balanced structure of roles among participants (collector, validator, nominee, and auditor) and connects other blockchains. The characteristics of the Polkadot blockchain include interoperability, scalability, easy blockchain configuration, proof of a forkless future, full security, and user regulation network.