TW202133078A - Group-Buying Platform System and Implementation Method Thereof Based on Blockchain Network - Google Patents

Abstract

Group-buying platform system and implementation method thereof based on blockchain network are disclosed. The system comprises a transaction server configured to generate a group-buying transaction between at least two electronic devices, wherein, the group-buying transaction includes group-buying information, identifying information, and transaction process information. The transaction server is also configured to execute hash function and encryption algorithms for each group-buying transaction, so as to generate an encrypted group-buying transaction which needs to be broadcasted to the blockchain network, wherein, the encrypted group-buying transaction received by one of the blockchain nodes will be distributed to the rest of the blockchain nodes, so as to let all blockchain nodes agree on a certain value or transaction(encrypted group-buying transaction) through the consensus protocol. In this way, the present invention can prevent the transaction data from being improperly changed, can reduce the disputes between consumer and merchant, can ensure data integrity, non-repudiation, non-forgery and irreversible of transaction data.

Description

Block chain-based group buying platform system and its implementation method

The present invention relates to the field of Internet technology, in particular to a "blockchain-based technology" that uses blockchain technology (Blockchain) to make the transaction process and related information of the group buying platform have the characteristics of non-repudiation, non-forgery, and irreversible modification. Group buying platform system and its implementation method".

With the development of information networks, the development of e-commerce is also booming. Group buying is an electronic sales model. As long as a sufficient number of consumers are gathered, goods can be purchased at a relatively favorable price, which allows sellers to make small profits but increase sales and reduce inventory. Buyers can get discounts and save money. Group purchase order information usually needs to be stored on a centralized platform-side server to prove that the group-buying transaction order does exist. However, if the platform-side server is to protect its own interests, Improper tampering of order information, once a consumer dispute occurs after the sale, it will make it difficult for group buying participants to obtain evidence and it is difficult to maintain their consumer rights, which may affect the trust of both parties in the group buying platform. Moreover, even if the transaction information is stored in a fair Third-party hosting server, if the hosting server is hacked, there is still the possibility of data corruption, loss or improper changes.

In addition, in the existing group buying model, users usually can only passively choose from group buying items created by the group buying platform, and must be limited to the group buying products and prices set by the group buying platform. In other words, the group buying platform pushes to The user’s group buying information may not meet their needs.

In summary, how to effectively prevent group purchase transaction data from being improperly altered or concealed/destroyed, how to reduce group purchase consumption disputes, how to ensure the data integrity of group purchase transaction data, and how to ensure the non-repudiation and irreversibility of the group purchase transaction process. The technology of group buying transactions still needs to be improved.

In order to achieve the above objective, the present invention proposes a blockchain-based group buying platform system and its implementation method. The group buying platform system includes a transaction server, a group buying platform, a database, and multiple networks in a blockchain network. At the road node, the transaction server can define a first electronic device as an initiator and a second electronic device as a participant in the database to form a first group buying group and store it in the database; The transaction server can also generate a group-buying transaction based on the group-buying information created by the first group-buying group and the first electronic device. The group-buying transaction includes group-buying information, transaction party identification information, and transaction process information, and the group-buying information includes a group-buying product The name, the price of a group purchase, and the quantity of a group purchase; the transaction server can also hash and encrypt each group purchase transaction to generate an encrypted group purchase transaction information and publish it to multiple network nodes of a blockchain network. Based on a consensus algorithm, each network node can determine that the encrypted group purchase transaction information received by one of the network nodes can be accepted as a legal block by all network nodes, and the legal block can be broadcast to other network nodes , So that all network nodes maintain the same version, and all contain a blockchain with encrypted group buying transaction information.

In addition to the above functions, the transaction server can also allow the second electronic device to act as another initiator to invite a third electronic device that has not joined the first group buying group to join a second group buying group to generate another group buying transaction, and Another group purchase transaction can be posted to the blockchain network for consensus verification.

In another embodiment, the transaction server further includes a cash flow module, which allows the second electronic device to pay the transaction amount equivalent to the group purchase price on the group purchase platform, and then each network node of the blockchain network will make a consensus. verify.

In another embodiment, the transaction server further includes a smart contract module, which can determine whether the update of transaction process information triggers a contract term and condition, or whether the group purchase quantity of a group purchase transaction triggers a target condition, so that the block After each network node of the chain network completes the consensus verification, it performs a contract state transition on the first electronic device or the second electronic device, or updates the group purchase price to a second group purchase price.

In order for your reviewer to have a clear understanding of the purpose, technical features and effects of the present invention after implementation, the following descriptions and illustrations are used for illustration, please refer to it.

Please refer to "Figure 1", which is a system architecture diagram of the present invention. The group-buying platform system 10 of the present invention allows multiple electronic devices (101, 102, 103...) to be connected to a group-buying platform via an Internet N1 201 for group buying. The group buying platform system 10 includes a group buying platform 201, a transaction server 20, a database 203, and multiple network nodes (301, 302, 303...) in a blockchain network N2, among which : (1) The group buying platform 201 and the database 203 can respectively communicate with the transaction server 202, and the transaction server 202 can use the group buying platform 201 to use services such as Web Service, Web API or WCF and electronic devices (101, 102, 103...) Perform data exchange so that the transaction server 202 generates a group buying transaction T1; (2) Among them, the aforementioned database 203 can be a database host, a cloud database, or multiple database files (such as Microsoft SQL Server database files) stored in the transaction server 202, and each database The file can contain multiple tables (Table) separately; (3) The transaction server 202 has a processor 2021, and a security module 2022 coupled to the processor 2021, which stores hash calculations, encryption and decryption calculations, and digital signatures (Digital Signature, also called digital signature). Signature) required program instructions for the processor 2021 to be executed after being loaded from a memory; (4) Among them, the aforementioned hash algorithm can be one-way hash algorithms such as SHA-0, SHA-1, SHA-2, SHA-3, MD5, BLAKE2, or encryption hash functions of MD5 and SHA (cryptographic hash function), but not limited to this. Any algorithm that can convert any length of data into an irreversible hash string (or message digest: Message Digest) composed of numbers and letters is all The hash calculation referred to in the present invention; (5) Among them, the aforementioned electronic signature mainly includes the mechanism of "signing" and "verification". For example, if A (first electronic device 101) wants to send a piece of data (such as information on confirmed purchase) to B ( For the second electronic device 102), the data can be hashed first, and then encrypted with A's private key to send an encrypted data to B. Then, B can hash the plaintext data it receives Calculate, at the same time use A’s public key to decrypt the received encrypted data, and then compare the two hash values. If they are the same, it can prove that the data is indeed sent by A and the data is being transmitted. There was no tampering during the process; in addition, the electronic signature can also be used to prove the ownership of a cryptocurrency wallet. If the user loses his private key, he will not be able to withdraw the cryptocurrency from the wallet; (6) The transaction server 202 can define a first electronic device 101 as an initiator and a second electronic device 102 as a participant in the database 203 to form a first group buying group G1, and Stored in the database 203; (7) The transaction server 202 can generate a group purchase between at least two electronic devices (101, 102...) based on the first group buying group G1, and the first electronic device 101 as the initiator. Transaction T1, the group purchase transaction T1 includes the aforementioned group purchase information, a transaction party identification information, and a transaction process information, and the group purchase information includes a group purchase product name, a group purchase price, and a group purchase quantity; (8) Among them, the aforementioned transaction party identification information may be a device identification code (ICCID code, IMEI code, etc.), a telephone number, and a User ID, etc., but not limited to this; (9) Among them, the aforementioned transaction process information can be a combination of a transaction detail information, an order establishment time, a payment time, a shipment time, an arrival time, a pickup time, a return time, and an order completion time. One of them or any combination thereof, but not limited to this; (10) Among them, the transaction server 202 of this embodiment may also allow the second electronic device 102 to act as another initiator to invite a third electronic device 103 that has not yet joined the first group buying group G1. Group-buying information, create another group-buying information and join a second group-buying group G2 to generate another group-buying transaction T2, thereby avoiding the third electronic device 103 from being unwilling to participate in group-buying after joining the first group-buying group G1 Case; (11) Continuing, in other words, even if the third electronic device 103 accepts the invitation of the first electronic device 101 or the second electronic device 102 and joins the first group buying group G1, it may be because the initiator (the first electronic device) is not familiar with it. 101), is only familiar with the second electronic device 102, which affects its willingness to participate in group buying. As a result, the first electronic device 101 in the first group buying group G1 sends to the first group buying group G1 through the transaction server 202 If the group-buying information of the third electronic device 103 of the third electronic device 103 is not allowed to generate a group-buying transaction in the transaction server 202, it is a waste of network traffic, causing the group-buying platform 201 to push unnecessary group-buying information; (12) The security module 2022 of the transaction server 202 can hash and encrypt each group purchase transaction (such as group purchase transactions T1, T2..., etc.) to generate an encrypted group purchase transaction information and publish it to the blockchain network Multiple network nodes (301, 302, 303...) of road N2; each network node (301, 302, 303...) communicates with each other, which can determine one of the networks based on a consensus algorithm The encrypted group buying transaction information received by node 301 can be accepted by all network nodes (301, 302, 303...) as a legal block, and the legal block can be broadcast to other network nodes (302, 303.) ..), so that all network nodes (301, 302, 303...) maintain the same version of a blockchain that contains encrypted group buying transaction information; (13) Continuing with the description of legal blocks, if Proof of Work (PoW) is used as the consensus algorithm of this embodiment, when one of the network nodes 301 preferentially calculates a numerical solution that meets the requirements (for example, calculates When the hash value of is less than a difficulty index), a block can be successfully established, and this block can be packaged (block, or blocked) to obtain a corresponding virtual currency reward (for example, 10 units of cryptocurrency) ), and broadcast the transaction to the blockchain network N2 for verification. If it passes the consensus verification of other network nodes (302, 303...), other network nodes (302, 303...) are calculating the same numerical solution. ...) The calculation will be abandoned, and this newly generated block will be regarded as a legal block and included in the latest block of a main chain to create a link with the previous block on the chain; (14) Among them, the aforementioned consensus algorithm can be, for example, a proof of work (Proof of Work), a proof of stake (PoS, Proof of Stake), a proof of authority (PoA, Proof-of-Authority), or a proxy Delegated Proof of Stake (DPoS, Delegated Proof of Stake) consensus mechanism, but not limited to this.

Please refer to "Figure 2", which is the flow chart of the implementation of the present invention. Please also refer to "Figure 1". The present invention provides an implementation method S of a group buying platform system. First, please refer to the implementation of "Figure 3" In a schematic diagram, a first electronic device 101 can first connect to a transaction server 202 through a group buying platform 201, and as an initiator, input a group buying information D1 into the first electronic device 101 to create a first group buying group G1, and a second electronic device 102 forming an invitation relationship with the first electronic device 101 can view a group buying group list on the group buying platform 201, and the group buying group list can display the first group buying to which the second electronic device 102 has been invited to join The information of group G1, the group buying group list can also display the second electronic device 102 as another initiator, and the second group buying group G2 created based on another group buying information D1' similar to the group buying information D1, the group buying group The group list can also show that the second electronic device 102 is invited by a third electronic device 103 to join a third group buying group G3 based on another group buying information D2, and then the following steps can be performed: (1) Generate a group buying transaction (Step S1): Please refer to the information flow diagrams in "Figure 4" ~ "Figure 5". The transaction server 202 is based on the first group buying group G1 of the second electronic device 102 that forms an invitation relationship with the first electronic device 101 , And based on the group buying information D1 created by the first electronic device 101 as the initiator, a group buying transaction T1 is generated, wherein the transaction server 202 can define the group buying transaction T1 in a database 203 including the group buying information D1 and a transaction party identification Information and transaction process information. The group-buying information D1 includes a group-buying product name, a group-buying price, and a group-buying quantity; (2) As above, when step S1 is executed, the transaction server 202 also allows the second electronic device 102 to act as another initiator Or, invite a third electronic device 103 that has not joined the first group buying group G1 to join a second group buying group G2 to generate another group buying transaction T2 based on another group buying information D1' similar to the group buying information D1, Preferably, the transaction server 202 of this embodiment can also restrict the second electronic device 102 to only invite a third electronic device 103 that has not joined the first group buying group G1 to join the second group buying group G2; (3) ) Group buying information hashing and encryption (step S2): As shown in the information flow diagram (1) of "Figure 4", a security module 2022 of the transaction server 202 performs one or more group buying transactions (T1, T2..) .) Perform hashing and encryption calculations to generate an encrypted group buying transaction information En(T), and publish it to multiple network nodes (301, 302, 303...) of a blockchain network N2; (4) Group buying information consensus verification (step S3): Each network node (301, 302, 303...) can determine the encrypted group buying transaction information En(T) received by one of the network nodes 301 based on a consensus algorithm, which can be All network nodes (301, 302, 303...) are accepted as a legal Block B, after completing the consensus verification, make the legal block B broadcast to other network nodes (302, 303...), so that all network nodes (301, 302, 303...) are maintained to include encrypted group purchases A block chain C of the transaction information En(T) is as shown in the information flow diagram (3) of "Figure 6"; (5) Succeeding, the "root node encryption hash value" illustrated in "Figure 6""Refers to "encrypted group purchase transaction information En(T)", which serves as the transaction record data assembly of legal block B. This embodiment uses Merkle trees (also known as Hash Tree) structure as the encrypted group purchase transaction For the data structure of information En(T), if the consensus algorithm of "Proof of Work (PoW)" is taken as an example, it can be seen from the "block #6" shown in the figure that each legal block B can include multiple mediums. Following the data (Block Metadata) and a block body (Block Body), the aforementioned metadata can include a parent block (for example, block #5), a block header hash value (Previous Block Header Hash), and a timestamp (Timestamp). ), a Nonce value (random value), and a node encryption hash value (Merkle Tree Root); the aforementioned block body may contain a transaction record (Transactions), and the transaction record can be represented by a Merkle tree structure to generate "block# 6" All transaction data to record transaction data including the hash value of each intermediate node including "group buying information", "transaction party identification information", and "transaction process information", and the encrypted hash value of the root node can be quoted as an intermediate node. The hash value of "group purchase information", "transaction party identification information", and "transaction process information", and use this as a basis to generate a unified "root node encrypted hash value"; (6) Continue, one of the intermediate nodes "group purchase The hash value of “Information” can be quoted from the hash value of “group purchase goods”, “group purchase price”, “group purchase quantity” and “group purchase conditions” as leaf nodes, so that each block can be compared with the previous block. Intangible links are generated from the data to ensure the correctness of the block sequence and historical group purchase transaction records. At the same time, the data calculation amount of the blockchain network N2 can be greatly reduced through the Merkle tree structure, but the above is only an example, not Such data structure and consensus algorithm are limited.

Please refer to "Figure 7", which is another embodiment (1) of the present invention. This embodiment is technically similar to the embodiments shown in "Figure 1" ~ "Figure 2". The main difference is that group buying The transaction server 202 of the platform system 10 further has a cash flow module 2023 coupled to the processor 2021, which stores program instructions for the user to perform online payments and bank transfers for the processor 2021 to transfer from a memory It is executed after being loaded. In other words, the cash flow module 2023 can be used by the second electronic device 102 on the group buying platform 201 to use, for example, an electronic currency (or electronic ticket), a virtual currency, a cryptocurrency, or execution during step S1. An electronic payment function. After paying the transaction amount equivalent to the group purchase price, a payment time information defined as a change feature of the transaction process information is generated to be used by each network node (301, 302) of the blockchain network N2 , 303...) conduct consensus verification; among them, the aforementioned electronic money can be, for example, currency pre-stored in a smart chip card. Among the chip cards with signal encryption by the private key, such as existing leisure cards and all-in-one cards, the virtual currency mentioned above can be, for example, an electromagnetic record issued by the group buying platform 201, and it can be exchanged with legal currency according to whether it can be exchanged with legal currency. Whether or not it is divided into closed type (such as Dinar coins) and open type (such as Amazon coins); the aforementioned cryptocurrency can be, for example, Bitcoin (BTC), Ether (ETH), etc.; the aforementioned electronic payment function can be, for example, Through financial electronic data interchange (Financial Electronic Data Interchange, FEDI) technology, it can connect to financial institutions for financial services such as fund transfer and transfer. The transaction server 202, as a third party, collects and pays (similar to the existing Pi mobile wallet) funds for group purchase initiators and participants, and has the function of an online stored value account, but the above are only examples and none of them Limited by this.

Please refer to "Figure 8", which is another embodiment (2) of the present invention. This embodiment is technically similar to the embodiments shown in "Figure 1" ~ "Figure 2". The main difference is that group buying The transaction server 202 of the platform system 10 further has a smart contract module 2024 coupled to the processor 2021, which can continue to execute "trigger smart contract execution" after the execution of step S3 (ie step S4): transaction server 202 According to a predefined modular smart contract SC, it is judged whether the update of transaction process information triggers a contract terms and conditions. If so, each network node (301, 302, 303...) of the blockchain network N2 can be After the verification of the change characteristic value of the transaction process information is completed, a contract state transition is performed on the first electronic device 101 or the second electronic device 102.

Following the embodiment shown in "Figure 8", more specifically, suppose that the first electronic device 101 (initiator) wants to create a group-buying information D1 based on it (for example, the group-buying product is T-Shirt, and the group-buying price is 500 yuan... and other information), sold to participants of the first group buying group G1, then the first electronic device 101 can first connect to the transaction server 202 through the group buying platform 201, so that the processor 2021 triggers the security module 2022 And smart contract module 2024 for the first electronic device 101 to sign with a private key, including "If a participant puts a payment equivalent to the group purchase price of 500 yuan, for example, a participant’s account (such as a public key that has been hashed) The public key address, which can be called a cryptocurrency wallet, is imported into an initiator account bound to the transaction server 202 by the first electronic device 101 (for example, another public key address after hashing), then The first electronic device 101 should be shipped, and the ownership of one of the group-purchase products T-Shirt should be automatically transferred to the payment participant" the modular smart contract SC of the smart contract terms, and make it public On the Internet N1 and the blockchain network N2, if the second electronic device 102 (participant) signs the modular smart contract SC with his private key and triggers the cash flow module 2023 of the transaction server 202, To transfer the encrypted currency (equivalent to the group purchase price of 500 yuan) in the participant account of the second electronic device 102 (such as the public key address after hash calculation) to the initiator account of the first electronic device 101 (the initiator) (For example, the public key address after hash calculation) to complete the payment, and then automatically trigger the contract terms and conditions of the modular smart contract SC, then the modular smart contract SC will pass through the network nodes of the blockchain network N2 , Perform consensus authentication on the change feature value of the transaction process information (that is, features such as payment transfer, ownership transfer... etc.), confirm whether the first electronic device 101 originally owned the group purchase product T-Shirt, and confirm whether the second electronic device 102 has Payment is equivalent to the group purchase price of 500 TWD... and other conditions. After the node confirms that all conditions are true, the smart contract module 2024 performs a contract state transition on the first electronic device 101 and the second electronic device 102, which means block The blockchain of the chain network N2 will record that the second electronic device 102 is the owner of the transferred group purchase product T-Shirt, and the initiator account of the first electronic device 101 obtains the cryptocurrency equivalent to the group purchase price of 500 TWD, The participant account of the second electronic device 102 is reduced by the cryptocurrency equivalent to the group purchase price of 500 TWD. After that, the first electronic device 101 can use a shipment number generated by the transaction server 202 in the block chain network N2 The network node of the network node performs the shipment operation during a specified period of the certificate deposit. In addition, when the server of the logistics industry is connected to the transaction server 202 of the present invention to read the blockchain data of the blockchain network N2, It enables logistics companies, suppliers, transportation companies, and other units to share information with each other In addition, through the smart contract module 2024 of the present invention, the labor cost of logistics order confirmation and tracking can be avoided, the error rate can be reduced, and the overall operating efficiency of the logistics industry and the group buying platform 201 can be improved.

However, the situation in the aforementioned "Figure 8" is only an example. For example, all other transaction process information change characteristics (such as the time of return, the time of exchange, etc.) can be used as conditions to sign in the smart contract terms of this embodiment, and similarly , The form of the initiator’s account and the participant’s account can also be a bank account, not limited to the public key address that has been hashed, and the form of currency payment is of course not limited to encrypted currency.

Please refer to "Figure 9", which is another embodiment (3) of the present invention. This embodiment has the same technology as the embodiment shown in "Figure 8", and please refer to "Figure 1" ~ " "Figure 2", the main difference is that the smart contract module 2024 of this embodiment can continue to execute "trigger smart contract execution" (ie step S4') after the execution of step S3 is completed: the transaction server 202 follows a predefined one Modular smart contract SC determines whether the group purchase quantity of group purchase transactions (T1, T2...) can trigger a target condition, if so, the group purchase price is updated to a second group purchase price, and the second group purchase price and group purchase The information of the total number of people in the group can be verified by consensus on each network node (301, 302, 303...) of the blockchain network N2.

Following the embodiment shown in "Figure 9", more specifically, suppose that the first electronic device 101 (initiator) wants to create a group buying information D1 based on it (for example, the group buying product is T-Shirt, and the group buying price is 500 yuan... and other information) to attract more users (other electronic devices) to join the first group buying group G1, and group buying at a more favorable group buying price (for example, if there are more than 3 people, the group buying price can be reduced to 400 yuan) , The first electronic device 101 can first connect to the transaction server 202 through the group buying platform 201, so that the processor 2021 triggers the security module 2022 and the smart contract module 2024, so that the first electronic device 101 can sign with a private key containing " If an electronic device joins the first group buying group G1, and the number of participants in the first group buying group G1 is greater than or equal to 3 people, the group buying price of the group buying product T-Shirt is reduced to 400 yuan, and the group buying information D1 is updated." The modular smart contract SC with the terms of the smart contract will be published on the Internet N1 and the blockchain network N2. If there is a third electronic device 103 (participant) at that time, join the first group purchase group with a total of 2 people Group G1 (the second electronic device 102 is the participant who has joined previously), the third electronic device 103 can sign the modular smart contract SC with its private key, and then automatically trigger the modular smart contract SC A target condition (the number of people reaches 3), so that the group purchase price (500 yuan) is updated to a second group purchase price (400 yuan), and each network node of the blockchain network N2 (301, 302, 303... ) Consensus verification can be performed on the updated second group purchase price and the total number of people in the group purchase group to confirm that the triggered target conditions are true.

Among them, as an example, the processor referred to in the present invention may have functions such as logic operations, temporarily storing operation results, and saving execution instruction positions to run the transaction server 202, and the processor may be, for example, a central processing unit (CPU), One virtual processor (vCPU), one microprocessor (MPU), one microcontroller (MCU), one application processor (AP), one embedded processor, one special application integrated circuit (ASIC), one A mass processor (TPU) or a graphics processing unit (GPU), but not limited to this.

Among them, as an example, the security module, cash flow module, and smart contract module referred to in the present invention can all be a server or a software module, and the server referred to in the present invention can be a physical server, or A server running in the form of a virtual machine (VM), or a server running in the form of a virtual private server, or a public cloud, or a private cloud, but not limited to this.

Among them, as an example, the Internet referred to in the present invention may be a public or private network, such as a wireless network (such as 3G, 4G LTE, Wi-Fi, Bluetooth), wired network, and local area network (LAN) , Wide Area Network (WAN), etc., but are not limited to this.

Among them, as an example, each electronic device referred to in the present invention may be one of a personal computer, a notebook computer, a smart phone, and a tablet computer, but it is not limited to this.

In summary, after the present invention is implemented, since the entire group buying transaction process can be recorded on the blockchain network with high credibility and decentralization characteristics, it will not be stored in the hands of a certain party. , So it can be more equal in law between the two parties who do not trust each other, and at the same time, it can ensure that the group-buying related information will not be tampered with, hidden or destroyed, and at the same time, the group-buying information stored on the blockchain and its transaction process can be irreversibly changed. It can also achieve the beneficial effects of group buying information and the transaction process that cannot be denied by the platform or both parties to the transaction.

The above are only preferred embodiments of the present invention, and are not intended to limit the scope of implementation of the present invention; anyone who is familiar with this technique can make equal changes and modifications without departing from the spirit and scope of the present invention. Should be covered within the scope of the patent of the present invention.

To sum up, the present invention has patent requirements such as "industrial applicability", "novelty" and "advancedness"; the applicant filed an application for a patent for invention with the Bureau in accordance with the provisions of the Patent Law.

10: Group buying platform system D1: Group purchase information G1: The first group buying group T1: Group purchase transaction D1’: Group buying information G2: The second group buying group T2: Group purchase transaction D2: Group purchase information G3: The third group buying group 202: Transaction Server 2021: processor 2022: Security Module 2023: Gold Flow Module 2024: Smart Contract Module SC: Modular smart contract 203: Database En(T): Encrypted group buying transaction information N1: Internet N2: Blockchain network 301: network node 302: network node 303: network node B: legal block C: Blockchain S: Implementation method of group buying platform system S1: Generate group purchase transactions S2: Group buying information hash and encryption S3: Group buying information consensus verification S4: Trigger smart contract execution S4’: Trigger smart contract execution

Figure 1 is a system architecture diagram of the present invention. Figure 2 is a flow chart of the method of the present invention. Figure 3 is a schematic diagram of the implementation of the present invention. Figure 4 is a schematic diagram (1) of the information flow of the present invention. Figure 5 is a schematic diagram (2) of the information flow of the present invention. Figure 6 is a schematic diagram (3) of the information flow of the present invention. Figure 7 shows another embodiment (1) of the present invention. Figure 8 shows another embodiment (2) of the present invention. Figure 9 shows another embodiment (3) of the present invention.

10: Group buying platform system

101: The first electronic device

102: second electronic device

103: third electronic device

201: Group buying platform

G1: The first group buying group

G2: The second group buying group

202: Transaction Server

2021: processor

2022: Security Module

203: Database

N1: Internet

N2: Blockchain network

301: network node

302: network node

303: network node

Claims (10)

A block chain-based group buying platform system, including: A transaction server, another database and a group buying platform are respectively communicatively connected to the transaction server; The transaction server is used in the database to define a first electronic device as an initiator and a second electronic device as a participant to form a first group buying group and store it in the database ； The transaction server is also used to generate a group buying transaction based on the first group buying group and a group buying information created by the first electronic device. The group buying transaction includes the group buying information, a transaction party identification information, and a transaction process information , The group purchase information includes a group purchase product name, a group purchase price and a group purchase quantity; The transaction server also allows the second electronic device to act as another initiator, inviting a third electronic device that has not yet joined the first group buying group to join a second group buying group based on the group buying information to generate another Group purchase transaction; The transaction server is also used to hash and encrypt each group purchase transaction to generate an encrypted group purchase transaction information and publish it to multiple network nodes of a blockchain network, and each network node is connected to each other in communication ;as well as Each network node is provided with a consensus algorithm to determine that the encrypted group purchase transaction information received by one of the network nodes can be accepted by all the network nodes as a legal block, and the legal block is available for broadcasting For the other network nodes, all the network nodes maintain a block chain containing the encrypted group buying transaction information. For example, the block chain-based group buying platform system of claim 1, wherein the transaction process information is a transaction detail information, an order establishment time, a payment time, a shipment time, an arrival time, a pickup time, One of a return time, an order completion time, or any combination thereof. For example, the block chain-based group buying platform system of claim 2, wherein the transaction server has a cash flow module for the second electronic device to pay with an electronic currency, a virtual currency or a cryptocurrency on the group buying platform After the transaction amount equal to the group purchase price, the payment time information is generated to be verified by each network node of the blockchain network. For example, the block chain-based group buying platform system of claim 1 or claim 3, wherein the transaction server has a smart contract module for judging the transaction process information based on a predefined modular smart contract Does the update trigger a contract term and conditions, so that each network node of the blockchain network will perform verification on the first electronic device or the second electronic device after verifying the change characteristic value of the transaction process information A contract state transition. For example, the block chain-based group purchase platform system of claim 1, wherein the transaction server has a smart contract module for determining whether the group purchase quantity of the group purchase transaction is based on a predefined modular smart contract A target condition is triggered to update the group purchase price to a second group purchase price after verification by each network node of the blockchain network. A method for implementing a block chain-based group buying platform system, including: (A) Step of generating a group buying transaction: a first group buying group formed by a transaction server based on a second electronic device forming an invitation relationship with a first electronic device, and a group buying created based on the first electronic device Information, a group purchase transaction is generated, and the transaction server defines in a database that the group purchase transaction includes the group purchase information, a transaction party identification information, and a transaction process information. The group purchase information includes a group purchase product name, a group purchase price, and a group purchase information. Group purchase quantity, where the transaction server also allows the second electronic device to act as another initiator to invite a third electronic device that has not joined the first group purchase group to join a second group purchase group based on the group purchase The information generates another group purchase transaction; (B) A group buying information hashing and encryption step: the transaction server hashes and encrypts the group buying transaction to generate an encrypted group buying transaction information and publish it to multiple nodes of a blockchain network; as well as (C) A group buying information consensus verification step: each network node determines that the encrypted group buying transaction information received by one of the network nodes can be accepted as a legal block by all the network nodes based on a consensus algorithm After the consensus verification is completed, the legal block can be broadcast to other network nodes, so that all network nodes maintain a block chain containing the encrypted group purchase transaction information. For example, the implementation method of the block chain-based group buying platform system of claim 6, wherein, when the transaction server generates a transaction detail information, an order establishment time, a payment time, a shipment time, and a After the transaction process information of one of the arrival time, a pickup time, a return time, and an order completion time, or any combination thereof, all the network nodes of the blockchain network are verified. For example, the implementation method of the block chain-based group buying platform system of claim 7, wherein the transaction server provides the second electronic device with a cash flow module in step (A), so that the second electronic device uses an electronic currency, a After paying the transaction amount equivalent to the group purchase price in virtual currency or a cryptocurrency, the payment time information is generated to be verified by each network node of the blockchain network. For example, the implementation method of the block chain-based group buying platform system of claim 5 or claim 8 further includes a triggering smart contract execution step: the transaction server determines whether the transaction process information is updated according to a modular smart contract Trigger a contract terms and conditions, and each of the network nodes of the blockchain network will verify the change characteristic value of the transaction process information to perform a contract state transition on the first electronic device or the second electronic device . For example, the implementation method of the block chain-based group purchase platform system of claim 5 further includes a triggering smart contract execution step: the transaction server determines that the group purchase quantity of the group purchase transaction triggers a target condition according to a modular smart contract At the time, the verification is completed by each network node of the blockchain network, and the group purchase price is updated to a second group purchase price.

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