Is it possible to apply for a patent for the blockchain?

With more and more blockchain technologies, more and more people apply for blockchain patents. However, in the process of applying for blockchain patents, there will be some legal and practical obstacles. For example, judging whether it meets the patent qualification, distinguishing which concepts are abstract and can't apply for a patent, and so on.

However, blockchain technology is still in an open state. Just like the internet in the 1990 s, it is open source and anyone can use it, but they can apply for related patents, not patents on blockchain technology. European crowdfunding has created a new crowdfunding model that combines blockchain, digital currency and physical assets, and should be able to apply for a patent.