Digital content evidence obtaining method, device and apparatus based on block chain

The embodiment of the invention provides a digital content evidence obtaining method, device and apparatus based on a block chain. The digital content evidence obtaining method based on the block chain comprises the steps of receiving an evidence obtaining task of digital content by a first node; selecting a plurality of second nodes from the plurality of nodes, and sending an execution instruction of the evidence obtaining task to each second node in the plurality of second nodes; receiving a plurality of evidence obtaining results returned by the second nodes after the second nodes execute the corresponding evidence obtaining tasks; judging whether the plurality of evidence obtaining results are matched or not; if the plurality of evidence obtaining results are matched, selecting any first evidence obtaining result from the plurality of evidence obtaining results as an evidence storage result; storing the evidence storage result locally, and broadcasting the evidence storage result to other nodes except the