Wallet system and transaction method

A wallet system, comprising a communication node, a scheduling node, and at least one backup node, wherein each node stores one private key, and all the private keys are for a same account;

• the communication node is configured to generate a transaction request based on received payment transaction information and send the transaction request to the scheduling node;
• the scheduling node is configured to select a plurality of nodes as signature nodes in response to the transaction request;
• the scheduling node is further configured to:
• after scheduling private keys of the signature nodes to sign a payment transaction one by one, generate signature success information and feed the signature success information back to the communication node;
• the communication node is further configured to perform a payment transaction operation after receiving the signature success information;
• the system further comprises a replacement node;
• the replacement node is configured to obtain a private-key encryption file of a designated to-be-replaced node from a cloud end in response to a node replacement instruction entered by a user, generate a node replacement request, and send the node replacement request to the scheduling node;
• the scheduling node is further configured to schedule, in response to the node replacement request, private keys of a plurality of other nodes than the to-be-replaced node to sign the private-key encryption file, such that the replacement node opens the private-key encryption file to obtain a private key of the to-be-replaced node, wherein the private-key encryption file of the to-be-replaced node is generated by encrypting the private key of the to-be-replaced node by using the private keys of the other nodes;
• and
• the replacement node is further configured to:
• after setting the private key of the to-be-replaced node as a private key of the replacement node, generate node change information and send the node change information to the scheduling node, such that the scheduling node is capable of performing node scheduling accurately.