Broker management method and system based on block chain

The invention discloses a broker management method and system based on a block chain. The method comprises the steps of obtaining broker identity information; generating a DID digital identity of the broker and a private key associated with the DID digital identity of the broker after the verification is passed; obtaining broker information of the broker, forming broker data signed by a DID digital identity of the broker and a public key associated with the broker data, encrypting the broker data and generating a decoding key associated with the encrypted broker data; obtaining a public key to query corresponding broker data on the first block chain node, and obtaining a decryption key to decrypt the broker data; the server platform opens cooperation authority to the broker; and obtaining cooperation information of the broker and the served party. According to the method, broker information uplink is realized based on the decentralization characteristic of the block chain, and meanwhile, upstream and downstre