IDAG is the representative of the next generation of encrypted money. By combining the block chain with the directed acyclic graph (DAG) technology, a point to point electronic cash system is created, and solve the problem which the transaction speed is too slow and the formalities are too high. IDAG creatively introduces blocks and main chains in the DAG entanglement network, realizes the POW consensus mechanism, and is based on a thorough solution to the impossible triangulation of centralization, security and efficiency. In the future, we will introduce various technologies such as Turing's complete intelligent contract and zero knowledge proof.