Blockchain is one of the most vulnerable systems to quantum computers. In fact, 25% of bitcoins are already unprotectable from hacking by quantum computers. Energy consumption is also a major problem: 4 billion households' worth of electricity is consumed for bitcoin. We solve these problems with quantum blockchain technology. Quantum blockchain is a blockchain that utilizes most of the existing blockchain as it is, and only the cryptographic generation part is run by a quantum computer. This means that there is no hacking risk with a quantum computer, and the power consumption of the blockchain is less than 0.1%. We are building a quantum-resistant blockchain ecosystem with this quantum blockchain as its engine.