Zero knowledge position proving method and system based on block chain

The invention discloses a zero-knowledge position certification method and system based on a block chain, and the method comprises the steps: searching a witness in a preset range under the condition that a certifier needs to certify the position of the certifier, and transmitting a communication keeping request to the witness; under the condition that the reply of at least one target witness is received, sending a position certification request to the at least one target witness; and under the condition that positioning information of at least one target witness is received, a zero-knowledge proof request is sent to a verifier based on the positioning information, and the zero-knowledge proof request comprises a first coordinate point and a first parameter. By utilizing the characteristics of decentralization, tampering resistance, traceability and the like of the block chain and combining a zero-knowledge proof protocol, the problems existing in centralized position proof can be avoided, the confidentiality