CN111210342B

CN111210342B - Method and storage medium for exporting buying credit based on blockchain

Info

Publication number: CN111210342B
Application number: CN202010039766.6A
Authority: CN
Inventors: 宋瑜超; 马超群; 周中定; 李信儒; 兰秋军
Original assignee: Hunan University
Current assignee: Hunan University
Priority date: 2020-01-15
Filing date: 2020-01-15
Publication date: 2023-09-22
Anticipated expiration: 2040-01-15
Also published as: CN111210342A

Abstract

The application discloses a method for exporting buying credit based on blockchain and a computer readable storage medium. The method utilizes the technical scheme of combining the blockchain with the identity authentication and the intelligent contract, simplifies the transaction execution process, ensures that the whole credit export process is automatically carried out on the blockchain, reduces manpower expenditure and resource waste, and improves the transaction efficiency and safety. And moreover, the problem of data sharing is solved by using a blockchain distributed account book technology, so that all participants can participate in accounting equally, a complete distributed database is maintained together, all data information is disclosed and transparent on a blockchain, the risk of trade fraud in the international financing trade process is solved, and the credit risk of importer is reduced to the maximum. In addition, by utilizing asymmetric encryption, a Hash algorithm and a digital signature technology, the problem of forging the bill is solved, and meanwhile, the efficiency of bill verification is improved.

Description

Method and storage medium for exporting buying credit based on blockchain

Technical Field

The present application relates to the technical field of export credit in international trade, and in particular, to a method for conducting export credit based on blockchain, and a computer readable storage medium.

Background

As shown in fig. 1, the export buyer credit refers to the state supporting the export of products in the country, and encourages the national financial institutions to offer preferential medium-term loans to importers, banks or importers by providing insurance, financing or interest subsidies and the like, and is mainly used for the foreign importers to purchase complete sets of equipment such as ships, airplanes, power stations, automobiles and other electromechanical products in the country. The export buyer credit can be divided into two forms according to the loan style: the export buyer credit directly loaned to the importer is loaned to the export buyer credit of the importer's place bank. And the export buyer credit which is loaned to the bank of the importer is loaned to the importer bank by the exporter bank, and the importer bank provides credit for the importer. The importer bank can successively return loans to the exporter bank according to the installment payment time of the importer's original plan, and can also transact according to a repayment method which is separately agreed by the two banks, and the debt between the importer and the importer bank is directly settled and paid by the two banks in China.

However, the existing way of loaning out the buyer credit to the importer's local bank has the following problems:

1. the operation risk is large: the large number of paper documents and contracts are likely to be counterfeited and difficult to distinguish, and the traditional internal flow is long and complex and is easily affected by external events and misoperation of individual participants.

2. The credit risk is large: the possibility of traditional business settlement violations is relatively high, and the reliability of the rating is reduced due to the potential benefit conflict problem of the rating institution and the credit participation parties.

3. The efficiency is low: in the traditional export buyer credit process, the opening and verification of a large number of paper documents are involved, and the document transmission process often adopts a postal delivery mode, so that the efficiency of trade activities is greatly reduced, and a large amount of resources such as manpower, material resources and the like are wasted.

Disclosure of Invention

The application provides a method for carrying out export buying credit based on a blockchain and a computer readable storage medium, which are used for solving the technical problems of high operation risk, high credit risk and low efficiency of an import collection mode in the existing export buying credit.

According to one aspect of the present application, there is provided a method of performing export credit of a buyer based on a blockchain, the loan being provided to a banking node at which an importer is located, comprising the steps of:

step S1: the importer node and the exporter node sign trade contracts and upload the trade contracts onto the blockchain;

step S2: after the importer node provides a repayment guarantee, the exporter local bank node processes the credit of the exporter for the importer based on the request of the exporter node, the exporter local bank node and the importer local bank node sign a loan agreement and upload the loan agreement to the blockchain, and the importer local bank node and the importer node sign the loan agreement and upload the loan agreement to the blockchain;

step S3: the exporter node and the exporter logistics node sign a freight contract on the blockchain;

step S4: the export business node carries out cargo export transportation activities, and relevant information in the cargo export transportation process is uploaded to the block chain after being signed by relevant node Hash;

step S5: the importer nodes carry out goods import transportation activities, and relevant information in the goods import transportation process is uploaded to the blockchain after being signed by relevant node Hash;

step S6: loan settlement activities are carried out based on requests of exporter nodes, and transfer records among all the party nodes are uploaded to a blockchain after being signed by relevant node Hash.

Further, the step S2 includes the steps of:

step S21: the importer node provides a repayment guarantee approved by the bank node of the place where the exporter is located, and the repayment guarantee is stored and recorded on the blockchain;

step S22: applying for export buyer credit from an export business node to an export business local bank node, deploying a credit application form on a block chain and carrying out Hash signature;

step S23: after receiving the credit application form, the bank node of the place where the exporter is located informs the third party credit agency node to apply for checking the credit condition of the node of the exporter;

step S24: the third party credit bureau node submits a request for investigating business, tax and social evaluation of the export bureau node to the Oracle node, the Oracle node returns an investigation report, and the third party credit bureau node generates a credit bureau condition table about the export bureau node according to the investigation report and trade contract, performs Hash signature confirmation and records the Hash signature on a blockchain;

step S25: the bank node of the exporter determines whether to agree with the credit application of the exporter according to the credit condition of the node of the exporter and the market condition of the trade goods, if the credit application is refused, a refusal notice of the node of the exporter is generated, if the credit application is refused, a Hash signature is carried out on an application form, and then the report is recorded on a blockchain;

step S26: after negotiating the insurance content under the node line of the exporter's place bank node and the node line of the exporter's insurance company, the node of the exporter's insurance company generates an insurance policy, sends the bank node of the place where the exporter is located after Hash signature is carried out and uploads the insurance policy to the blockchain, and after the bank node of the place where the exporter is located receives the insurance policy and confirms that the insurance policy content is correct, the insurance policy is subjected to Hash signature confirmation and uploaded to the blockchain;

step S27: the bank node at the place where the importer is located generates a corresponding loan agreement and carries out a Hash signature and then records the corresponding loan agreement on the blockchain, notifies and sends the corresponding loan agreement to the bank node at the place where the importer is located, which has a cooperative relationship with the importer, the bank node at the place where the importer is located carries out a Hash signature confirmation after receiving the loan agreement for verification, stores the certificate and records the certificate on the blockchain, the bank node at the place where the importer is located generates a loan agreement with the importer node, sends the Hash signature to the importer node after carrying out the Hash signature after the importer node verifies and records the Hash signature on the blockchain;

step S28: and after confirming that the importer node is subjected to loan agreement acknowledged by the banking nodes of the two parties, prepaying a deposit to the exporter node, signing the transfer certificate by Hash, and recording the signature on the blockchain.

Further, the step S2 further includes the following steps:

after the local bank node of the exporter agrees with the credit application of the node of the exporter, the local bank node of the exporter puts forward the credit patch application of the export buyer to the local government department node of the exporter, and the local government department node of the exporter sends out notification after checking agreement and carries out Hash signature and records the notification on the blockchain;

after the banking node of the place where the exporter is located and the banking node of the place where the importer is located sign a loan agreement, the government department node of the place where the exporter is located issues subsidies to the banking node of the place where the exporter is located according to the loan agreement, and the subsidies are stored and recorded on the blockchain after Hash signature is carried out on the subsidies.

Further, the step S1 includes the steps of:

step S11: after negotiating under the line of the importer node and the exporter node, the exporter node carries out Hash signature on the trade contract, encrypts the abstract of the trade contract by using the private key of the exporter node, sends the abstract to the importer node and records the abstract on the blockchain;

step S12: the importer node uses the public key of the exporter node to verify, determines that the trade contract is drawn by the exporter node and the content of the trade contract is correct, uses the private key to carry out Hash signature confirmation, and records the Hash signature on the blockchain.

Further, the step S3 includes the steps of:

step S31: after determining that the exporter node is a loan agreement acknowledged by the banking nodes of the two parties and confirming receipt of the deposit, the exporter node deploys a freight contract on a blockchain and sends out a logistics node of the exporter after Hash signing;

step S32: and after receiving the freight contract, the exporter logistics node verifies and confirms that the contract is correct, confirms the receipt, confirms the Hash signature on the freight contract and records the Hash signature on the blockchain.

Further, the step S4 includes the steps of:

step S41: the export commodity node prepares the commodity, applies for commodity inspection to the export quality inspection bureau node and records the commodity inspection to the block chain;

step S42: after the export quality inspection bureau node is qualified in business inspection, a business inspection report is issued, a Hash signature is carried out, and the report is uploaded to a blockchain, and the export bureau node is notified;

step S43: the export business node applies for the export proof of the enterprise permission to the export business office node, the export business office node receives the application notice, and after the export business office node is qualified in verification, the export proof of the enterprise permission is issued, hash signature is carried out, and the export proof is uploaded to the blockchain;

step S45: the exporter node stores and records the complete customs clearance bill on the blockchain, applies for clearance to the exporter customs node, opens a release notice after the exporter customs node performs field auditing and checking success, performs Hash signature and uploads the Hash signature to the blockchain;

step S46: the outlet side logistics node generates a bill of lading after receiving the goods, sends out the bill of lading after carrying out a Hash signature, stores the certificate and records the certificate on the block chain, and carries out the Hash signature confirmation and records the certificate on the block chain after verifying and confirming the bill of lading.

Further, the step S4 further includes the following steps between the step S43 and the step S45:

step S44: after negotiating under the node line of the exporter and the node line of the insurer of the exporter, the node of the insurer of the exporter generates a policy, sends the policy to the node of the exporter and records the policy on the blockchain after Hash signature, verifies the node of the exporter and confirms that the content of the policy is correct, and then confirms the Hash signature, and stores and records the policy on the blockchain.

Further, the step S5 includes the steps of:

step S51: the importer node applies for commercial inspection to the importer quality inspection bureau node, and the importer quality inspection bureau node checks the goods to be qualified, then issues a qualified certificate, carries out Hash signature and records the Hash signature on a blockchain;

step S52: the importer node applies for an enterprise permission import certificate from the importer business office node, the importer business office node receives the request, issues the enterprise permission import certificate after verification is qualified, performs Hash signature, and records the enterprise permission import certificate on the blockchain;

step S53: the importer node applies for a report to the importer tax bureau node, the importer tax bureau node receives the request, processes the report for the importer node according to the confirmed receipt information and invoice information on the blockchain, deducts the tax to be paid from a bank account of the importer node, issues a paid tax certificate, carries out Hash signature and records the tax certificate on the blockchain;

step S54: the importer node applies for the in-situ inspection to the importer customs node, the importer customs node carries out the in-situ inspection, confirms that the conditions are met and the payment is Guan Shuihou, sends out release notification and carries out Hash signature and then records the release notification on the blockchain;

step S55: the outlet side logistics node notifies the inlet side logistics node, applies for placing goods in a warehouse of the inlet side logistics node, and notifies the inlet side node after confirming a commodity inspection qualified certificate, an enterprise allowed import certificate, a tax payment certificate and a release notification are error-free, and records the allowed placement certificate on a blockchain after issuing a Hash signature.

Further, the step S6 includes the steps of:

step S61: the exporter node stores and records the complete bill under the rest of the credit of the buyer on the blockchain, and after the auditing of the importer bank node is finished, the importer node is sent a notice and recorded on the blockchain;

step S62: after checking the bill and determining that the bill meets the requirements, the bank node at the place where the exporter is located reminds the bank node at the place where the importer is located, records the transfer record Hash signature on the blockchain, and after receiving the remittance, the bank node at the place where the importer is located credits the remittance to the importer node, and records the transfer record Hash signature on the blockchain;

step S63: the importer node pays the rest amount of money to the exporter node, and records the transfer record Hash signature on the blockchain;

step S64: the banking node of the importer site pays loans back to the banking node of the exporter site according to the loan agreement period, and records the transfer record Hash signature on the blockchain;

step S65: the liabilities between the importer node and the importer site bank node are paid in China according to the agreed contents of the importer node and the importer site bank node, and the transfer record Hash signature is recorded on the blockchain.

The present application also provides a computer readable storage medium storing a computer program for performing a method of performing export credit based on blockchain as described above when run on a computer.

The application has the following beneficial effects:

the method for carrying out the export credit of the buyer based on the blockchain utilizes the technical scheme of combining the blockchain with the identity authentication and the intelligent contract, simplifies the process of executing the transaction, ensures that the whole process of exporting the credit of the buyer is automatically carried out on the blockchain, reduces manpower expenditure and resource waste, and improves the efficiency and the safety of the transaction. And moreover, the problem of data sharing is solved by using a blockchain distributed account book technology, so that all participants can participate in accounting equally, a complete distributed database is maintained together, all data information is disclosed and transparent on a blockchain, the risk of trade fraud in the international financing trade process is solved, and the credit risk of importer is reduced to the maximum. In addition, by utilizing asymmetric encryption, a Hash algorithm and a digital signature technology, the problem of forging the bill is solved, and meanwhile, the efficiency of bill verification is improved.

In addition to the objects, features and advantages described above, the present application has other objects, features and advantages. The present application will be described in further detail with reference to the drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a schematic diagram of a business architecture of an existing way of loaning an export buyer to an importer's local bank.

FIG. 2 is a block chain network deployment diagram of a method of exporting buyer credit based on a block chain in accordance with a preferred embodiment of the present application.

FIG. 3 is a business network diagram of a method for exporting buyer credit based on blockchain in accordance with the preferred embodiment of the present application.

FIG. 4 is a flow chart of a method of exporting buyer credit based on a blockchain in accordance with a preferred embodiment of the present application.

Fig. 5 is a schematic flow chart of step S1 in fig. 4 according to a preferred embodiment of the present application.

Fig. 6 is a schematic sub-flow diagram of step S2 in fig. 4 in accordance with a preferred embodiment of the present application.

Fig. 7 is a schematic flow chart of step S3 in fig. 4 according to a preferred embodiment of the present application.

Fig. 8 is a schematic flow chart of step S4 in fig. 4 according to a preferred embodiment of the present application.

Fig. 9 is a schematic sub-flow chart of step S5 in fig. 4 according to a preferred embodiment of the present application.

Fig. 10 is a schematic flow chart of step S6 in fig. 4 according to a preferred embodiment of the present application.

Detailed Description

Embodiments of the application are described in detail below with reference to the attached drawing figures, but the application can be practiced in a number of different ways, as defined and covered below.

For ease of understanding, as shown in fig. 2 and 3, the multi-party nodes involved in the blockchain network in the blockchain-based method of exporting buyer credit are explained below.

1. Oracle node (prophetic machine): the platform for providing external information can allow the blockchain to be connected to any existing API, and can import, store and export information about network nodes on the blockchain, so that dynamic acquisition of the information is realized.

2. Exporter node: also referred to as suppliers or shippers, generally refer to foreign companies, manufacturing companies, etc. that have authority to transact export services.

3. The exporter quality inspection bureau node: the detecting mechanism indicates that the importer is responsible for checking whether the commodity meets the export requirement.

4. Export bureau node: the government is a working department for governing market supervision and administrative law enforcement, and is mainly responsible for checking whether an export enterprise has export rights and is in an operation state in the import-export trade business.

5. Exporter insurance company node: the importer is pointed out to a company that provides insurance services for goods transportation and the like.

6. Export customs node: the customs of the consignment party is responsible for auditing the mechanisms for verifying the delivery of the goods and collecting tariffs and other tax fees.

7. Export side logistics node: the method indicates that the importer at least engages in transportation (including transportation agency and goods express) or storage as an operation business, and can organize and manage basic functions of transportation, storage, loading and unloading, packaging, circulation processing, distribution and the like according to the logistics requirements of clients, and the method has an information management system which is suitable for self business, and implements independent accounting and independent economic organization for bearing civil responsibility.

8. The banking node at the location of the exporter: the bank of the indicated importer is responsible for accepting the loan application of the exporter, and issues the loan for the importer bank after investigation, evaluation, reporting and approval.

9. The government agency node at the point of sale: and interest subsidizing is carried out on the bank of the place where the export business is located.

10. Importer node: refers to an enterprise or business engaged in import commerce. They purchase goods from abroad and sell to industrial and mining enterprises, wholesalers and retailers in the country; or processed or stored slightly and transferred to other countries or regions.

11. Importer's local banking node: the bank of the importer is responsible for signing a loan agreement with the bank of the exporter, and is used for forwarding the loan to the importer by the money borrowed from the bank of the exporter, and then the loan is paid to the bank of the exporter according to the loan agreement in stages.

12. An importer quality inspection bureau node: the finger importer is responsible for checking whether the commodity meets the detection mechanism of import requirements.

13. Ingress square business office node: refers to the work department of government governing market supervision and administrative law enforcement, and is mainly responsible for checking whether import enterprises have import rights and are in an operating state in import-export trade business.

14. Importer customs node: the customs of the importer is responsible for auditing and checking the mechanism of issuing passes for goods.

15. Entering side logistics node: the finger-entering party at least engages in transportation (including transportation agency and goods express) or storage as an operation business, and can organize and manage basic functions of transportation, storage, loading and unloading, packaging, circulation processing, distribution and the like according to the logistics requirements of clients.

16. Importer tax bureau node: the government agency governing tax work refers to the department in the business that the importer is responsible for handling import tax payment.

17. Third party credit bureau node: and the agency system is used for collecting enterprise and personal information and providing enterprise and personal information inquiry, rating and inquiry services for enterprise and personal information users and independently operating agency persons according to the approval of related laws and regulations.

As shown in FIG. 4, the preferred embodiment of the present application provides a method for exporting buyer credit based on blockchain, the loan being provided to a banking node at the importer's location, comprising the steps of:

In this embodiment, the method for performing export credit based on the blockchain uses the technical scheme of combining the blockchain with identity authentication and intelligent contracts, so that the transaction execution process is simplified, the whole export credit process is automatically performed on the blockchain, the manpower expenditure and resource waste are reduced, and the transaction efficiency and security are improved. And moreover, the problem of data sharing is solved by using a blockchain distributed account book technology, so that all participants can participate in accounting equally, a complete distributed database is maintained together, all data information is disclosed and transparent on a blockchain, the risk of trade fraud in the international financing trade process is solved, and the credit risk of importer is reduced to the maximum. In addition, by utilizing asymmetric encryption, a Hash algorithm and a digital signature technology, the problem of forging the bill is solved, and meanwhile, the efficiency of bill verification is improved.

It will be appreciated that, as shown in fig. 6, the step S1 specifically includes the following steps:

In the step S1, the trade contract is uploaded to the blockchain after being signed by the common Hash of the exporter node and the importer node, and the signing process of the contract is carried out on the blockchain, so that the processing process is quickened, the information is disclosed and transparent, the contract can be prevented from being tampered, and other nodes can effectively monitor the authenticity of the trade conveniently.

It will be appreciated that, as shown in fig. 6, the step S2 specifically includes the following steps:

It will be appreciated that, as a preferred option, the step S2 further comprises the steps of:

In the step S2, the process of transacting the credit of the export buyer is automatically performed on the blockchain, so that the processing efficiency and the security are greatly improved, and the banking node of the location of the export can accurately acquire the information such as the business, tax, social evaluation and the like of the node of the export through the Oracle node, thereby being beneficial to accurately evaluating the credit condition of the node of the export by the banking node of the location of the export, reducing the financing risk of the banking node of the location of the export, and in addition, all the data information needs to be confirmed by the relevant node signature, so that the follow-up investigation is convenient.

It will be appreciated that, as shown in fig. 7, the step S3 specifically includes the following steps:

step S31: after determining that the export commodity node is subjected to loan agreements acknowledged by bank nodes of the places where the two parties are located and confirming receipt of the principal, the export commodity node deploys a freight contract on a blockchain, carries out Hash signature, then sends out an export commodity circulation node, and rents a ship to the export commodity circulation node for booking a cabin;

In the step S3, the shipping contract is signed and confirmed by both the exporter node and the exporter logistics node and then uploaded to the blockchain, so that the possibility that the shipping contract is tampered and counterfeited is prevented, and supervision by other nodes is facilitated.

It will be appreciated that, as shown in fig. 8, the step S4 includes the steps of:

step S45: the exporter node stores and records the complete customs clearance bill (including commercial invoice, packing bill and the like) on the blockchain, applies for customs clearance to the exporter customs node, opens a release notice after the exporter customs node is subjected to field auditing and checking success, and uploads the report to the blockchain after Hash signature is carried out;

It will be appreciated that the step S4 further includes the following steps between the step S43 and the step S45:

In the step S4, information related to the export of the goods is signed by the related nodes and recorded on the blockchain, so that the export circulation process of the goods can be effectively supervised by the nodes of other parties.

It will be appreciated that, as shown in fig. 9, the step S5 includes the steps of:

In the step S5, the information related to the goods import is signed by the related nodes and recorded on the blockchain, so that the other nodes can effectively monitor the goods import process, and the condition that the importer node carries goods private escape violations can be prevented.

It will be appreciated that, as shown in fig. 10, the step S6 specifically includes the following steps:

step S61: the exporter node stores and records the complete documents (including credit premium invoices, management fee invoices, charge invoice and the like) under the rest of the credit of the buyer on the blockchain, and after the importer bank node checks, the importer node is sent a notice and recorded on the blockchain;

In the step S6, the exporter node needs to upload all documents to the blockchain and enter the loan settlement stage after passing the verification of the banking node where the exporter is located, so as to prevent the possibility of cheating the exporter node, and the transfer records among all nodes in the goods payment settlement stage need to be uploaded to the blockchain after the signature confirmation of the relevant nodes, so that the information is public and transparent, and the follow-up investigation management is convenient.

It will be appreciated that the second embodiment of the present application also provides a computer-readable storage medium storing a computer program for performing the method of exporting buyer credit based on blockchain as described above when run on a computer.

Forms of general computer-readable media include: a floppy disk (floppy disk), a flexible disk (flexible disk), hard disk, magnetic tape, any other magnetic medium, a CD-ROM, any other optical medium, punch cards, paper tape, any other physical medium with patterns of holes, a Random Access Memory (RAM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), a FLASH erasable programmable read-only memory (FLASH-EPROM), any other memory chip or cartridge, or any other medium from which a computer can read. The instructions may further be transmitted or received over a transmission medium. The term transmission medium may include any tangible or intangible medium that may be used to store, encode, or carry instructions for execution by a machine, and includes digital or analog communications signals or their communications with intangible medium that facilitate communication of such instructions. Transmission media includes coaxial cables, copper wire and fiber optics, including the wires that comprise a bus for transmitting computer data signals.

The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A method for performing export credit based on blockchain, wherein a loan is provided to a banking node at an importer's location, characterized in that,

the method comprises the following steps:

step S6: carrying out loan settlement activities based on requests of exporter nodes, and uploading transfer records among all the party nodes to a blockchain after Hash signatures of related nodes;

the step S1 includes the steps of:

step S12: the importer node verifies by using the public key of the exporter node, determines that the trade contract is drawn by the exporter node and the content of the trade contract is correct, performs Hash signature confirmation by using the private key of the importer node and records the Hash signature confirmation on the blockchain;

the step S2 includes the steps of:

step S28: after determining that the importer node is subjected to a loan agreement acknowledged by banking nodes of the places where the importer node and the exporter node are pre-paid with a deposit, the deposit certificate is signed by a Hash and recorded on a blockchain;

step S29: after the local bank node of the exporter agrees with the credit application of the node of the exporter, the local bank node of the exporter puts forward the credit patch application of the export buyer to the local government department node of the exporter, and the local government department node of the exporter sends out notification after checking agreement and carries out Hash signature and records the notification on the blockchain;

step S210: after the banking node of the place where the exporter is located and the banking node of the place where the importer is located sign a loan agreement, the government department node of the place where the exporter is located issues subsidies to the banking node of the place where the exporter is located according to the loan agreement, and Hash signature is carried out on the subsidies, and then the certificates are stored and recorded on a blockchain;

the step S3 includes the steps of:

step S32: after receiving the freight contract, the outlet logistics node verifies and confirms that the contract is correct, confirms the receipt, confirms the Hash signature on the freight contract and records the Hash signature on the blockchain;

the step S4 includes the steps of:

step S44: the export business node negotiates with the export insurance company node line and then makes an application for goods, the export insurance company node generates a policy, sends the policy to the export business node and records the policy on the blockchain after Hash signature, and the export business node verifies and confirms that the policy content is correct, then confirms the Hash signature, and stores and records the policy on the blockchain;

step S46: the outlet side logistics node generates a bill after receiving goods, carries out a Hash signature, sends the bill to the outlet side logistics node, stores the bill and records the bill on the block chain, and carries out the Hash signature confirmation and records the bill on the block chain after the outlet side logistics node verifies and confirms that the bill is correct;

the step S5 includes the steps of:

step S55: the method comprises the steps that an exporter logistics node informs an importer logistics node, applies for placing goods in a warehouse of the importer logistics node, and informs the importer node after confirming a commodity inspection qualified certificate, an enterprise allowed import certificate, a tax payment certificate and a release notification are correct, and records the allowed placement certificate on a blockchain after issuing the allowed placement certificate and carrying out Hash signature;

the step S6 includes the steps of:

2. A computer readable storage medium storing a computer program for performing the method of exporting buyer credit based on a blockchain as in claim 1, when the computer program is run on a computer.