Data transaction and right confirmation method based on block chain

The invention relates to a data transaction and right confirmation method based on a block chain, and belongs to the technical field of block chains. The invention provides a data transaction and right confirmation method realized by using a block chain technology and a digital watermarking technology; a data buyer and a data seller publish transaction demands to a block chain platform, and a system performs transaction recommendation on the data buyer and the data seller according to the demands published by the data buyer and the data seller; when the two transaction parties conclude the transaction intention, asset transfer is completed through an intelligent contract; in order to better determine the ownership of the data, the data is marked by using a digital watermarking technology, and when a data dispute occurs, the mark of the data can be extracted and the transaction record can be traced to make right confirmation. Compared with the prior art, the scheme of carrying out data transaction by utilizing