It is difficult to determine the best blockchain company in China as there are many companies making significant contributions to the blockchain industry in the country. However, one company that stands out is Ant Group.

Ant Group, formerly known as Ant Financial, is a subsidiary of the Chinese e-commerce giant Alibaba. The company is known for its blockchain technology platform, AntChain, which provides a range of blockchain-based solutions for various industries including finance, supply chain, and healthcare.

AntChain has been widely adopted by businesses in China and around the world for its secure and efficient blockchain solutions. The platform offers features such as smart contracts, digital asset management, and data encryption to help companies streamline their operations and enhance data security.

In addition to its blockchain technology, Ant Group is also a major player in the digital payments industry with its popular mobile payment platform, Alipay. The company has been at the forefront of digital innovation in China and has been instrumental in driving the adoption of blockchain technology in the country.

Overall, Ant Group is considered one of the leading blockchain companies in China due to its innovative technology, wide-ranging applications, and strong track record of success. While there are many other notable blockchain companies in China, Ant Group's impact on the industry and its continued growth make it a top contender for the title of the best blockchain company in the country.