CN110704539A - Supply chain management method and device - Google Patents
Supply chain management method and device Download PDFInfo
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- CN110704539A CN110704539A CN201910938731.3A CN201910938731A CN110704539A CN 110704539 A CN110704539 A CN 110704539A CN 201910938731 A CN201910938731 A CN 201910938731A CN 110704539 A CN110704539 A CN 110704539A
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Abstract
The invention provides a supply chain management method and a device, wherein the method comprises the following steps: setting a master blockchain and at least one slave blockchain for a supply chain in advance, wherein each participating role in the supply chain corresponds to one slave blockchain; assigning a participation role to each participant in the supply chain in advance; dividing transaction data of each transaction into first class data and second class data in advance; for each transaction in the supply chain, performing: acquiring transaction data of a current transaction; determining a target participation role of a target participant that is an initiator of a current transaction; determining a target slave block chain corresponding to the target participation role; saving a first type of data in the transaction data of the current transaction into the master block chain; saving a second type of data in the transaction data of the current transaction to the target slave blockchain. The invention provides a supply chain management method and a supply chain management device, which can manage a supply chain more easily.
Description
Technical Field
The present invention relates to the field of supply chain management technologies, and in particular, to a supply chain management method and apparatus.
Background
Supply chain management refers to a management method for manufacturing, selling, and distributing products by effectively organizing suppliers, manufacturers, distributors, retailers, logistics companies, and the like together to minimize the overall supply chain system cost while satisfying a certain customer service level.
In the prior art, each participant in the supply chain stores transaction data in transactions, the transaction data is not disclosed generally, and the transaction data is not shared among the participants in the supply chain. In addition, even if some of the parties share the transaction data, other parties cannot determine the authenticity of the transaction data.
As can be seen from the above description, in the prior art, the credible transaction data in the supply chain cannot be obtained, and the management of the supply chain is difficult.
Disclosure of Invention
The embodiment of the invention provides a supply chain management method and device, which can manage a supply chain more easily.
In one aspect, an embodiment of the present invention provides a supply chain management method, including:
setting a master blockchain and at least one slave blockchain for a supply chain in advance, wherein each participating role in the supply chain corresponds to one slave blockchain;
assigning a participation role to each participant in the supply chain in advance;
dividing transaction data of each transaction into first class data and second class data in advance;
for each transaction in the supply chain, performing:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
Alternatively,
after the saving of the second type data in the transaction data of the current transaction into the target slave blockchain, further comprising:
generating a second class data existence certificate in the transaction data of the current transaction according to the second class data in the transaction data of the current transaction;
further comprising:
saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
further comprising:
when a request to query second type data in the transaction data of the current transaction is received,
and according to the existence certification of the second class data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, carrying out integrity verification on the second class data in the transaction data of the current transaction, and when the verification is passed, returning the second class data in the transaction data of the current transaction according to the storage address.
Alternatively,
the pre-assigning of a participation role for each participant in the supply chain comprises:
for each of the participants in each of the supply chains, performing:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
Alternatively,
the method further comprises the following steps:
when a transaction data request for inquiring the current transaction is received, executing:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
Alternatively,
a first type of data in the transaction data comprising: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: details of the transaction.
Alternatively,
the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
In another aspect, an embodiment of the present invention provides a supply chain management apparatus, including:
the system comprises a role distribution unit, a transaction data processing unit, a master blockchain and at least one slave blockchain, wherein the master blockchain and the at least one slave blockchain are arranged for a supply chain;
wherein each participating role in the supply chain corresponds to one of the slave blockchains; the transaction data of each transaction is divided into first class data and second class data;
the role allocation unit is used for allocating a participation role for each participant in the supply chain;
the transaction data processing unit is used for executing, for each transaction in the supply chain:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
Alternatively,
the transaction data processing unit is further configured to generate a proof of existence of the second type of data in the transaction data of the current transaction according to the second type of data in the transaction data of the current transaction after the second type of data in the transaction data of the current transaction is saved in the target slave blockchain;
the transaction data processing unit is further used for saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
the transaction data processing unit is further configured to, when a request for querying second type data in the transaction data of the current transaction is received, perform integrity verification on the second type data in the transaction data of the current transaction according to the existence certification of the second type data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, and when the verification is passed, return the second type data in the transaction data of the current transaction according to the storage address.
Alternatively,
the role allocation unit is used for executing, for each participant in each supply chain:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
Alternatively,
the transaction data processing unit is further used for executing, when a transaction data request for inquiring the current transaction is received:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
Alternatively,
a first type of data in the transaction data comprising: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: details of the transaction.
Alternatively,
the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
In the embodiment of the invention, the master blockchain and the slave blockchain are preset, the transaction data generated by each transaction between the participants of the supply chain are stored in the master blockchain and the slave blockchain, the data in the blockchain is not falsifiable, and the participant roles in the supply chain can check the credible transaction data from the blockchain, so that the supply chain can be managed more easily.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a flowchart of a supply chain management method according to an embodiment of the present invention;
FIG. 2 is a flow chart of another supply chain management method provided by an embodiment of the invention;
fig. 3 is a schematic diagram of a supply chain management device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer and more complete, the technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention, and based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a supply chain management method, which may include the following steps:
step 101: setting a master blockchain and at least one slave blockchain for a supply chain in advance, wherein each participating role in the supply chain corresponds to one slave blockchain;
step 102: assigning a participation role to each participant in the supply chain in advance;
step 103: dividing transaction data of each transaction into first class data and second class data in advance;
step 104: for each transaction in the supply chain, performing:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
In the embodiment of the invention, the master blockchain and the slave blockchain are preset, the transaction data generated by each transaction between the participants of the supply chain are stored in the master blockchain and the slave blockchain, the data in the blockchain is not falsifiable, and the participant roles in the supply chain can check the credible transaction data from the blockchain, so that the supply chain can be managed more easily.
In an embodiment of the present invention, after saving the second type data in the transaction data of the current transaction into the target slave blockchain, the method further includes:
generating a second class data existence certificate in the transaction data of the current transaction according to the second class data in the transaction data of the current transaction;
further comprising:
saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
further comprising:
when a request to query second type data in the transaction data of the current transaction is received,
and according to the existence certification of the second class data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, carrying out integrity verification on the second class data in the transaction data of the current transaction, and when the verification is passed, returning the second class data in the transaction data of the current transaction according to the storage address.
In the embodiment of the invention, the existence certification is generated aiming at the second type data in the transaction data, the integrity verification of the data in the sub-block chain can be carried out through the existence certification and the block header information, and when the verification is passed, the data in the sub-block chain is complete and can be directly returned to a user for inquiring the data.
In an embodiment of the present invention, the allocating a participating role to each participant in the supply chain in advance includes:
for each of the participants in each of the supply chains, performing:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
In this embodiment of the present invention, the registration information may include: uploading user qualification image files, qualification materials and the like. During the auditing, the business management system can be audited, and specifically, the qualification of the current participant is audited. After the audit is passed, the participation role can be allocated to the current participant according to the qualification of the current participant.
In an embodiment of the invention, the method further comprises:
when a transaction data request for inquiring the current transaction is received, executing:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
The price, quantity and total price of the commodity transaction in the transaction data are all related to sensitive data. In the embodiment of the invention, when the transaction that the main block chain and the sub-block chain contain sensitive data is inquired, the participant of the transaction can see the original data of the block, but not the participant of the transaction, only can see the data desensitized to the sensitive data by using the desensitization rule, so that the safety of the transaction data can be ensured.
In an embodiment of the present invention, the first type of data in the transaction data includes: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: details of the transaction.
In an embodiment of the present invention, the transaction type may be determined according to both parties of the transaction, for example: a transaction initiated by a distributor to a retailer, a transaction initiated by a manufacturer to a distributor, etc. The information of the transaction participants includes: company information of both parties participating in the transaction, etc. The transaction summary information includes: name, quantity, etc. of the delivery in the transaction. The transaction details may be information in the form of pictures, audio, video, etc.
In an embodiment of the present invention, the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
As shown in fig. 2, an embodiment of the present invention provides a supply chain management method, including:
step 201: a master blockchain and at least one slave blockchain are set for a supply chain in advance, wherein each participating role in the supply chain corresponds to one slave blockchain.
Specifically, participating in a role includes: suppliers, manufacturers, distributors, retailers, logistics companies; then a slave blockchain is assigned to the supplier, manufacturer, distributor, retailer, logistics company, respectively. For example, in a supply chain, there are three companies whose participating roles are suppliers, then all three use the corresponding slave blockchains of suppliers.
Step 202: each participant in the supply chain is assigned a participation role in advance.
Step 203: the transaction data of each transaction is divided into a first type data and a second type data in advance.
For each transaction occurring between participants in the supply chain, the following steps are performed:
step 204: transaction data for a current transaction is obtained.
For example, the current transaction is that company a sends 100 goods to company B.
Step 205: a target participation role of a target participant that is an initiator of a current transaction is determined.
Specifically, in the above transaction, company a is the initiator of the current transaction, the participating role of company a is the distributor, and the participating role of company B is the retailer.
Step 206: and determining a target slave block chain corresponding to the target participation role.
Specifically, a slave blockchain corresponding to the distributor is determined.
Step 207: saving the first type of data in the transaction data of the current transaction into the master block chain.
Specifically, the first type of data includes: one or more of transaction type, transaction participant information, transaction summary information.
Step 208: saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
Specifically, the second type of data includes: details of the transaction. The transaction details may include: the photos and video files of the commodities provided by the suppliers and manufacturers, and the like, and can also comprise trade contracts, trade documents, logistics contracts, logistics information of the commodities, and the like.
Specifically, when the second type data in the transaction data needs to be saved to the slave blockchain, a block is generated on the subblockchain, and the second type data in the transaction data is saved to the generated block.
Step 209: and generating the existence certification of the second class data in the transaction data of the current transaction according to the second class data in the transaction data of the current transaction.
Specifically, the Merkle tree-based presence certificate of the second class of data in the transaction data of the current transaction may be generated according to the second class of data in the transaction data of the current transaction.
Step 210: and saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain.
Step 211: when a request for inquiring second type data in the transaction data of the current transaction is received, integrity verification is carried out on the second type data in the transaction data of the current transaction according to existence certification of the second type data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, and when the verification is passed, the second type data in the transaction data of the current transaction is returned according to the storage address.
The supply chain management method provided by the embodiment of the invention can ensure that the transaction on the whole supply chain is transparent and visualized, reduce the trust cost of each participant in the supply chain, and solve the problems of inconsistency of block information and a real object and difficulty in tracing the source of a product.
The block chain technology is a decentralized and non-falsifiable shared account book technology, and the supply chain management method provided by the embodiment of the invention aims to realize the combination of the block chain technology and the supply chain management. Specifically, a platform containing all supply chain links of suppliers, manufacturers, distributors, retailers, logistics companies and the like is built based on a block chain technology, all enterprises on the platform form an alliance, logistics, information flow and fund flow are recorded on a block chain, all dynamic states of the supply chain are tracked and monitored in real time, and collaborative work is achieved to enable the whole supply chain to be transparent and visual, multiple participants of each transaction can check the same transaction record, verify identity and confirm the transaction without a third-party intermediary.
As shown in fig. 3, an embodiment of the present invention provides a supply chain management apparatus, including:
a role assignment unit 301, a transaction data processing unit 302, and a master blockchain 303 and at least one slave blockchain 304 set for a supply chain;
wherein each participating role in the supply chain corresponds to one of the slave blockchains; the transaction data of each transaction is divided into first class data and second class data;
the role allocation unit 301, configured to allocate a participating role for each participant in the supply chain;
the transaction data processing unit 302 is configured to, for each transaction in the supply chain, perform:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
In an embodiment of the present invention, the transaction data processing unit is further configured to, after the second type of data in the transaction data of the current transaction is saved in the target slave blockchain, generate a proof of existence of the second type of data in the transaction data of the current transaction according to the second type of data in the transaction data of the current transaction;
the transaction data processing unit is further used for saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
the transaction data processing unit is further configured to, when a request for querying second type data in the transaction data of the current transaction is received, perform integrity verification on the second type data in the transaction data of the current transaction according to the existence certification of the second type data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, and when the verification is passed, return the second type data in the transaction data of the current transaction according to the storage address.
In an embodiment of the present invention, the role assignment unit is configured to, for each of the participants in each of the supply chains, perform:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
In an embodiment of the present invention, the transaction data processing unit is further configured to, when receiving a transaction data request for querying the current transaction, perform:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
In an embodiment of the present invention, the first type of data in the transaction data includes: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: details of the transaction.
In an embodiment of the present invention, the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
Because the information interaction, execution process, and other contents between the units in the device are based on the same concept as the method embodiment of the present invention, specific contents may refer to the description in the method embodiment of the present invention, and are not described herein again.
The embodiments of the invention have at least the following beneficial effects:
in the embodiment of the invention, the master blockchain and the slave blockchain are preset, the transaction data generated by each transaction between the participants of the supply chain are stored in the master blockchain and the slave blockchain, the data in the blockchain is not falsifiable, and the participant roles in the supply chain can check the credible transaction data from the blockchain, so that the supply chain can be managed more easily.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other similar elements in a process, method, article, or apparatus that comprises the element.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it is to be noted that: the above description is only a preferred embodiment of the present invention, and is only used to illustrate the technical solutions of the present invention, and not to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. A supply chain management method is characterized in that,
setting a master blockchain and at least one slave blockchain for a supply chain in advance, wherein each participating role in the supply chain corresponds to one slave blockchain;
assigning a participation role to each participant in the supply chain in advance;
dividing transaction data of each transaction into first class data and second class data in advance;
further comprising:
for each transaction in the supply chain, performing:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
2. The method of claim 1,
after the saving of the second type data in the transaction data of the current transaction into the target slave blockchain, further comprising:
generating a second class data existence certificate in the transaction data of the current transaction according to the second class data in the transaction data of the current transaction;
further comprising:
saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
further comprising:
when a request to query second type data in the transaction data of the current transaction is received,
and according to the existence certification of the second class data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, carrying out integrity verification on the second class data in the transaction data of the current transaction, and when the verification is passed, returning the second class data in the transaction data of the current transaction according to the storage address.
3. The method of claim 1,
the pre-assigning of a participation role for each participant in the supply chain comprises:
for each of the participants in each of the supply chains, performing:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
4. The method of claim 1,
further comprising:
when a transaction data request for inquiring the current transaction is received, executing:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
5. The method according to any one of claims 1 to 4,
a first type of data in the transaction data comprising: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: transaction details;
and/or the presence of a gas in the gas,
the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
6. A supply chain management device, comprising:
the system comprises a role distribution unit, a transaction data processing unit, a master blockchain and at least one slave blockchain, wherein the master blockchain and the at least one slave blockchain are arranged for a supply chain;
wherein each participating role in the supply chain corresponds to one of the slave blockchains; the transaction data of each transaction is divided into first class data and second class data;
the role allocation unit is used for allocating a participation role for each participant in the supply chain;
the transaction data processing unit is used for executing, for each transaction in the supply chain:
acquiring transaction data of a current transaction;
determining a target participation role of a target participant that is an initiator of a current transaction;
determining a target slave block chain corresponding to the target participation role;
saving a first type of data in the transaction data of the current transaction into the master block chain;
saving a second type of data in the transaction data of the current transaction to the target slave blockchain.
7. The apparatus of claim 6,
the transaction data processing unit is further configured to generate a proof of existence of the second type of data in the transaction data of the current transaction according to the second type of data in the transaction data of the current transaction after the second type of data in the transaction data of the current transaction is saved in the target slave blockchain;
the transaction data processing unit is further used for saving the block header information of the target slave block chain and the storage address of the second class data in the transaction data of the current transaction into the master block chain;
the transaction data processing unit is further configured to, when a request for querying second type data in the transaction data of the current transaction is received, perform integrity verification on the second type data in the transaction data of the current transaction according to the existence certification of the second type data in the transaction data of the current transaction and the block header information of the target slave block chain stored in the master block chain, and when the verification is passed, return the second type data in the transaction data of the current transaction according to the storage address.
8. The apparatus of claim 6,
the role allocation unit is used for executing, for each participant in each supply chain:
receiving registration information of a current participant;
and auditing the registration information of the current participant according to the registration information of the current participant, and distributing the participation role in the supply chain to the current participant according to the registration information of the current participant after the auditing is passed.
9. The apparatus of claim 6,
the transaction data processing unit is further used for executing, when a transaction data request for inquiring the current transaction is received:
a1: judging whether sensitive data exists in the transaction data of the current transaction, if so, executing A2, otherwise, returning the transaction data of the current transaction;
a2: and judging whether the requesting party sending the request is a trading party participating in the current transaction, if so, returning the trading data of the current transaction, and otherwise, returning the data after desensitization of the trading data.
10. The apparatus according to any one of claims 6 to 9,
a first type of data in the transaction data comprising: one or more of transaction type, transaction participant information, transaction summary information;
a second type of data in the transaction data, comprising: transaction details;
and/or the presence of a gas in the gas,
the participating roles include: supplier, manufacturer, distributor, retailer, logistics company.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113269621A (en) * | 2021-06-17 | 2021-08-17 | 上海万向区块链股份公司 | Commodity transaction method and system based on block chain |
| CN113362145A (en) * | 2021-07-19 | 2021-09-07 | 上海万向区块链股份公司 | Block chain-based train ticket selling method and system |
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