CN111598389A

CN111598389A - Block chain-based trading system for preventing bill market risk

Info

Publication number: CN111598389A
Application number: CN202010276215.1A
Authority: CN
Inventors: 吴恒鑫; 凌捷; 蔡睿; 谢锐
Original assignee: Guangdong University of Technology
Current assignee: Guangdong University of Technology
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-08-28
Anticipated expiration: 2040-04-09
Also published as: CN111598389B

Abstract

The invention discloses a block chain-based trading system for preventing bill market risk, which comprises: the device comprises a basic layer, a functional layer and an application layer, wherein the basic layer comprises: the system comprises a P2P network, an intelligent contract, a consensus algorithm and a digital signature, wherein the basic layer is in communication connection with a functional layer, the functional layer is used for providing functions of keeping, purchasing, selling and transferring bills, and the functional layer is in communication connection with an application layer. The invention overcomes the defect of centralization of the traditional trading system by constructing the three-layer trading system based on the block chain and improves the trading efficiency.

Description

Block chain-based trading system for preventing bill market risk

Technical Field

The invention relates to the technical field of block chains, in particular to a transaction system for preventing the risk of a bill market based on a block chain.

Background

The Byzantine fault-tolerant technology is a fault-tolerant technology in the field of distributed computing. The byzantine assumption is a modeling of the real world, and unpredictable behavior of computers and networks may occur due to hardware errors, network congestion or interruption, and malicious attacks. A parallel Byzantine Fault-tolerant algorithm (CBFT) is a new consensus algorithm developed from the Byzantine Fault-tolerant algorithm. Compared with the traditional fault-tolerant technology, the CBFT has concurrency, and each block can vote and be established in a mode of being concurrent with other blocks, so that the consensus speed is greatly improved.

The bill market is the main place for short-term fund financing, is the hub directly connecting industrial capital and financial capital, is a sub-market of the currency market, and is the most basic and the most extensive component in the transaction body in the whole currency system. Because the bill market system is centralized, once the central server goes wrong, the whole market is paralyzed, the problems of one bill for many sales, asynchronous paying and endorsement and the like easily occur, the potential risks such as credit risk, operation risk, supervision risk, paper ticket keeping risk and the like exist, the long-term healthy development of the market is influenced to a certain extent, and the bill market system is urgently concerned and solved.

Disclosure of Invention

The invention provides a transaction system for preventing the bill market risk based on a block chain, aiming at overcoming the defects that the bill transaction efficiency is low and centralization is easy to attack in the prior art.

The primary objective of the present invention is to solve the above technical problems, and the technical solution of the present invention is as follows:

a blockchain-based trading system for preventing risk in a ticket market, comprising: the device comprises a basic layer, a functional layer and an application layer, wherein the basic layer comprises: the system comprises a P2P network, an intelligent contract, a consensus algorithm and a digital signature, wherein the basic layer is in communication connection with a functional layer, the functional layer is used for providing functions of keeping, purchasing, selling and transferring bills, and the functional layer is in communication connection with an application layer.

In the scheme, the consensus algorithm is an improved CBFT algorithm, and the improved CBFT algorithm is used for carrying out consensus negotiation on the bills.

In this scheme, the specific process of performing consensus negotiation on the ticket through the improved CBFT algorithm is as follows:

receiving a bill transaction request sent by a user and feeding the request back to a building block node, wherein the building block node builds a block, packs bill transaction records to the block, generates a block timestamp, records transaction time and transaction data, and then sends the block to other nodes;

the nodes receive the created blocks, vote the blocks, digitally sign the voting information and forward the voting information to other nodes, and each node receives the votes of all the nodes and counts the votes to obtain a final result; the voting comprises: agreeing to admit the current block and disagreeing to admit the current block;

if the number of nodes agreeing to accept the current block exceeds two thirds, the block is confirmed, the current block is added to the block chain of the bill transaction, and a response is sent to the client side of the application layer.

In the scheme, in the process of identifying the bill transaction data, each node checks the voting information with other nodes.

In the scheme, the trading system further comprises a leader node, and when the trading system is added with a new node, authentication of the leader node is required. When a new node is added, the leader node authenticates the new node, and the safety of the trading system is enhanced.

In this scenario, the leader node generates the following conditions:

each node of the transaction can send a request for electing to become a leader node, the node after sending the request becomes a candidate node, and when other nodes in the transaction system receive the request, voting is started;

the candidate nodes can vote for themselves, when the number of votes selected by any one of the candidate nodes is greater than or equal to N/2+1, the candidate node becomes a leader node, wherein N is the total number of nodes of the trading system;

only one leader node is allowed to exist in the same period, if the leader node fails, the new leader node is determined by the votes of other nodes, and the original leader node does not have the leader authority any more.

Compared with the prior art, the technical scheme of the invention has the beneficial effects that:

the invention overcomes the defect of centralization of the traditional trading system by constructing the three-layer trading system based on the block chain and improves the trading efficiency.

Drawings

FIG. 1 is a system architecture diagram of the present invention.

Fig. 2 is a flow chart of the agreement negotiation of the receipt transaction in the present invention.

FIG. 3 is a flow chart of electing a leader node in the present invention.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Noun interpretation

Block: the storage unit is a storage unit and adopts a structure of 'block head + block body', data used for verifying the validity of the recorded data in the block head and index data of a previous block are included in the block body, and the recorded data in a certain time is included in the block body.

Block chains: the method is essentially a decentralized database, and is used as a bottom-layer technology of the bitcoin, namely a series of data blocks which are generated by correlation through a cryptographic method, wherein each data block contains information of a batch of bitcoin network transactions, and the information is used for verifying the validity of the information and generating a next block.

And (3) node: the nodes in the ticket market risk system of the present invention are made up of a group of trustworthy participants who participate in building a P2P network environment, referred to as nodes.

Federation chain: a plurality of preselected nodes are designated as billers for members of a specific group and limited third parties, and generation of each block is determined by all the preselected nodes.

Digital signature: only the sender of the information can generate a digital string which cannot be forged by others, and the digital string is also a valid proof for the authenticity of the information sent by the sender of the information.

Intelligent contract: a contract that can be automatically executed on a computer system when certain conditions are met allows us to execute a traceable, irreversible, and secure transaction without the need for a third party.

The present invention is a client/server schema architecture with consensus on ticket trading based on a federation chain environment that is de-centric. The alliance chain network is composed of nodes and is responsible for storing block chain data, maintaining data consistency and providing block chain service for clients through alliance chains.

The node deploys an intelligent contract of the bill transaction when the alliance chain environment is built, the intelligent contract restricts the business rules of the bill transaction, and the intelligent contract is automatically executed when called by the transaction and strictly complies with the contract flow. The nodes play a transaction consensus role, and the nodes perform consensus on the bill transaction data through a modified CBFT algorithm.

Example 1

As shown in fig. 1, a block chain based trading system for preventing the risk of the bill market includes: the device comprises a basic layer, a functional layer and an application layer, wherein the basic layer comprises: the system comprises a P2P network, an intelligent contract, a consensus algorithm and a digital signature, wherein the basic layer is in communication connection with a functional layer, the functional layer is used for providing functions of keeping, purchasing, selling and transferring bills, and the functional layer is in communication connection with an application layer.

The nodes of the bill transaction participants form block chain nodes, the bills are regarded as a pass certificate (certificate of rights and interests), the safety and reliability of transaction data are guaranteed through the block chain, and the circulation of the pass certificate is completed.

It should be noted that, because the improved parallel byzantine fault-tolerant algorithm (CBFT algorithm) may exchange wrong voting information due to a system error when coordinating nodes on a trading system, thereby causing a situation that final consistency of the system is affected, each node needs to check the voting information with other nodes in the process of consensus on the data of the bill transaction, thereby ensuring final consistency of the system.

The improved parallel Byzantine fault-tolerant algorithm plays an important role in a trading system for preventing the ticket market risk, when trading operation is carried out, the consensus node can verify the operation validity of updating the contract data, and the trade uplink is refused in a mode of casting a negative ticket in the negotiation process. The transaction confirmation time of the transaction system for preventing the ticket market risk is shortened through an improved parallel Byzantine fault-tolerant algorithm.

As shown in fig. 2, in the present solution, the specific process of performing consensus negotiation on a ticket through the improved CBFT algorithm is as follows:

The improved CBFT algorithm improves the consensus speed, shortens the transaction confirmation time, and ensures the final consistency of the system through checking the voting information among the nodes, thereby effectively realizing the consensus on the bill transaction data.

It should be noted that, the same piece of ticket transaction data generally needs to be distributed to a plurality of distributed nodes, which is vulnerable to the threat of witch attack, and if a malicious node exists in the P2P network, and the data that originally needs to be distributed to the plurality of nodes is fraudulently backed up to the same malicious node, the malicious node can control a large part of the system, thereby destroying the redundancy policy of the system. In order to reduce the influence of Sybil attacks on a trading system for preventing the ticket market risk, a reliable leader node is elected, and when the system joins a new node, authentication of the leader node is required:

as shown in fig. 3, the step of electing the leader node, in this scheme, the leader node generates the following conditions:

and only one leader node is allowed in the same period, if the leader node fails, the new leader node is determined by the votes of other nodes, and the original leader node does not have the leader authority any more.

When a trading system for preventing the bill market risk joins a new node, the leader node sends a request of a certificate capable of proving the identity of the node to the new joining node, after the new joining node receives the request, the new joining node responds to the leader node and sends related certificate information, and then the leader node carries out authentication according to the information of the new joining node and determines whether the new joining node can really join the network or not.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A blockchain-based trading system for preventing risk in a ticket market, comprising: the device comprises a basic layer, a functional layer and an application layer, wherein the basic layer comprises: the system comprises a P2P network, an intelligent contract, a consensus algorithm and a digital signature, wherein the basic layer is in communication connection with a functional layer, the functional layer is used for providing functions of keeping, purchasing, selling and transferring bills, and the functional layer is in communication connection with an application layer.

2. The blockchain-based trading system for preventing ticket market risk of claim 1, wherein the consensus algorithm is a modified CBFT algorithm, and the consensus negotiation is performed on the tickets through the modified CBFT algorithm.

3. The block chain-based trading system for preventing the market risk of the bills according to claim 2, wherein the specific process of the consensus negotiation of the bills through the improved CBFT algorithm is as follows: receiving a bill transaction request sent by a user and feeding the request back to a building block node, wherein the building block node builds a block, packs bill transaction records to the block, generates a block timestamp, records transaction time and transaction data, and then sends the block to other nodes;

4. The blockchain-based trading system for preventing the market risk of the bills according to claim 1, wherein each node checks the voting information with other nodes in the process of identifying the data of the trades of the bills.

5. The block chain-based trading system for preventing the risk of the bill market according to claim 1, further comprising a leader node, wherein the certification by the leader node is required each time the trading system joins a new node.

6. The blockchain-based trading system for preventing ticket market risk according to claim 5, wherein the leader node generates conditions including: