Information resource acquisition method, device and system based on block chain

The embodiment of the invention discloses an information resource acquisition method, device and system based on a block chain, and the method comprises the steps: receiving a data request sent by a demand side client, the data request comprising information corresponding to demand data, an intelligent contract and supplier identification information, and the intelligent contract comprising demandside identification information; wherein the information corresponding to the demand data, the intelligent contract and the supplier identification information are obtained by a demand side through query from a data directory mounted on a block chain, the demand side signs on the intelligent contract by using a public key through a demand side client, and the intelligent contract comprises a request limiting condition for the demand data and stores a request process record; sending the data request to a supplier client; and receiving the encrypted demand data, and feeding the encrypted demanddata back to the demand s