The invention discloses a building method of a digital copyright tracing
system based on a block chain and a cloud platform. The method comprises the following steps: designing a general framework of the digital copyright tracing
system based on the block chain and the cloud platform; building a block chain
consensus mechanism, wherein nodes in the block chain reach a consistent
consensus on the aspects of node reliability and data real-time performance; designing a
digital content storage way based on the block chain and the cloud platform, wherein the block chain stores a
Hash function value formed after dimension reducing
processing of
digital content, and the cloud platform saves
digital content on which a digital content producer performs a
digital signature with a private key; building a digital content transaction platform based on the block chain to perform a registration transaction and an
authentication transaction of the digital content; and building a digital content copyright tracing model, and performing tracing by using a chain-style relation of a
Hash chain in the block chain. Through adoption of the method, safe and effective propagation of digital products can be realized, and the problem that digital content copyrights cannot be traced is solved.