CCET (Certified Carbon Emission Transaction) Project realizes the new ecosystems of carbon credits transaction system based on smart contract through blockchaining with CDM (Clean Development Mechanism) for reducing greenhouse gas to prevent global warming. We aim to develop this system which carbon credits can be converted to blockchain, in order to encourage participation and understanding of the public and solve problems of complexity and accessiblity to the carbon market. It will become the first blockchain system to the compulsory market of carbon credits and encourage various individual Prosumers who is either can be Producer or Consumer to participate in greenhouse gas reduction activity with renewable energy. Furthermore, it will be regarded as transaction method in real economy with “Creation and Transaction System of Carbon Credits based on Blockchained Encryption” Also, CCET Project is a solution in complicated processes to develop CDM project and transaction system of CERs (Certified Emission Reductions). From this perspective,CDM methodologies will be applied to small scale energy system (Micro-Grid) and distributed transportation system (TTN, Trans-Transport-Network) as well as big scale energy system (Big-Grid)for greenhouse gas reductions are converted into carbon credits which are eventually formed as blockchain.