As more and more services and socializing shift from the real world to the online world, identifying each other digitally has become a prominent theme. Development of Identity Verification (“IDV”) Technology is one of the most significant trends, which will have a critical impact on the digital economy. However, none of the existing online IDV technologies addresses two fundamental requirements: results generated from online IDV should be undeniable and unalterable. THEKEY smart contract system will use NEO smart contract, and develop under DNA framework. THEKEY will co-establish a smart economy which consists of digital asset, digital identity and smart contract together with NEO. BDMI stands for “Blockchain based Dynamic Multi-Dimension Identification” technology. Such a solution perfectly echoes the main requirements for identifying each other in the digital world, which is ‘The Key’ for migrating people from the real world to the online world. BDMI, as the name of it, synergistically combines Dynamic Multi-Dimension Identification (“DMI”) technology and blockchain technology. DMI has already passed its development stage and is currently applied to THEKEY’s existing first-generation IDV solutions, which has built a very solid ground work to guarantee the successful development of BDMI.