Credit issuing system, product usage history transmission device, credit issuing method, and program

Abstract

Provided is a credit issuance system that contributes to enabling easy utilization of small amounts of credit. This credit issuance system comprises: a product information transmission device that transmits product information of a product to a blockchain via a network; a product usage history transmission device that automatically transmits usage history of the product to the blockchain via the network; and a credit issuance device that verifies, via the network, product information of a product registered in the blockchain and usage history of the product registered in the blockchain, issues a credit used for carbon offsetting on the basis of the verified usage history, generates a certificate including the credit, and transmits the certificate to the blockchain. Upon receiving the product information of the product, the usage history of the product, or the certificate, the blockchain generates a block, which is registered in the blockchain.

Description

[Technical Field]

[0001] The present invention relates to a credit issuing system, a product usage history transmitting device, a credit issuing method, and a program. [Background technology]

[0002] Patent Document 1 relates to an energy trading system that mediates energy trading between a first user who sells energy and a second user who buys energy.

[0003] Patent Document 2 relates to a system for securitizing environmental added value that allows even small-scale green power generators to trade environmental value securitized in small units with consumers over a network.

[0004] Patent Document 3 relates to a certificate management device that shortens the time required to issue non-fossil certificates and safely manages non-fossil certificates.

[0005] Patent Document 4 relates to an electricity trading intermediary device that can provide environmental value or electricity, or environmental value and electricity, to potential buyers.

[0006] Patent Document 5 relates to an emissions credit management system that determines a business to receive business support, identifies a financial institution that will provide loans to the determined business, and easily realizes the trading of emissions credits.

[0007] Non-Patent Document 1 relates to the J-Credit Scheme.

[0008] Non-Patent Document 2 is about Bitcoin.

[0009] As described in Non-Patent Document 1, the J-Credit Scheme is in operation, in which countries certify greenhouse gas emissions and absorption amounts as credits.

[0010] Furthermore, in a blockchain such as Bitcoin described in Non-Patent Document 2, transactions are grouped together to form a block, and the block header of each block includes the hash value of the block header of the previous block, making it impossible to rewrite the data in a block on the blockchain, and managing the ledger on the blockchain.

[0011] The blocks that are approved and added to the blockchain are determined by each block-producing node connected via a peer-to-peer (P2P) network using a consensus mechanism such as proof of work (PoW). [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Patent No. 6945213 [Patent Document 2] Special Publication No. 2019-028827 [Patent Document 3] Japanese Patent Publication No. 2020-027340 [Patent Document 4] Japanese Patent Publication No. 2022-018463 [Patent Document 5] Patent No. 6625298 [Non-patent literature]

[0013] [Non-Patent Document 1] "J-Credit System Homepage (https: / / japancredit.go.jp / )", [online], [Retrieved March 4, 2022], Internet<URL: https: / / japancredit.go.jp / > [Non-patent document 2] S. Nakamoto, "Bitcoin: A Peer-to-Peer Electronic Cash System," [online], [Retrieved March 2, 2022], Internet, URL: https: / / bitcoin.org / bitcoin.pdf Summary of the Invention [Problem to be solved by the invention]

[0014] The following analysis is provided by the present invention.

[0015] As described in Non-Patent Document 1, the certification of credits (hereinafter referred to as "credits") used for carbon offsetting, such as J-Credits, requires a lot of work, making it difficult for the general public to easily utilize the credits in small amounts.

[0016] An object of the present invention is to provide a credit issuing system, a product usage history transmitting device, a credit issuing method, and a program that contribute to making it possible to easily utilize small amounts of credit. [Means for solving the problem]

[0017] According to a first aspect of the present invention, there is provided a product information transmission device that transmits product information of a product to a blockchain via a network; a product usage history transmission device that automatically transmits the product usage history to the blockchain via the network; a credit issuing device that verifies, via the network, the product information of the product registered on the blockchain and the usage history of the product registered on the blockchain, issues credits to be used for carbon offsetting based on the verified usage history, generates a certificate including the credits, and transmits the certificate to the blockchain; The blockchain can provide a credit issuing system that generates a block and registers it in the blockchain when it receives the product information of the product, the usage history of the product, or the certificate.

[0018] According to a second aspect of the present invention, a product usage history transmission device can be provided that transmits product usage history to a blockchain via a network.

[0019] According to a third aspect of the present invention, a method for implementing a blockchain technology includes: transmitting, by a product information transmission device, product information of a product to a blockchain via a network; When the blockchain receives the product information of the product, generating a block and registering it in the blockchain; a step in which a product usage history transmission device automatically transmits the product usage history to the blockchain via the network; When the blockchain receives the usage history of the product, generating a block and registering it in the blockchain; a credit issuing device verifying, via the network, the product information of the product registered in the blockchain and the usage history of the product registered in the blockchain, issuing credits to be used for carbon offsetting based on the verified usage history, generating a certificate including the credits, and transmitting the certificate to the blockchain; A credit issuance method may be provided that includes the step of generating a block and registering it in the blockchain when the blockchain receives the certificate.

[0020] According to a fourth aspect of the present invention, there is provided a program that causes a computer included in a product usage history transmission device to execute a process of transmitting product usage history to a blockchain via a network. This program can be recorded on a computer-readable storage medium. The storage medium can be a non-transient medium such as a semiconductor memory, a hard disk, a magnetic recording medium, or an optical recording medium. The present invention can also be embodied as a computer program product. [Effects of the Invention]

[0021] According to the present invention, it is possible to provide a credit issuing system, a product usage history transmitting device, a credit issuing method, and a program that contribute to making it possible to easily utilize small amounts of credit. [Brief explanation of the drawings]

[0022] [Figure 1] 1 is a diagram illustrating an example of a schematic configuration of a credit issuing system according to an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating an example of a schematic configuration of a credit issuing system according to a first embodiment of the present invention. [Figure 3] FIG. 2 is a diagram illustrating an example of the operation of a block generation unit of the blockchain according to the first embodiment of the present invention. [Figure 4] 3 is a flowchart showing an example of the general operation of the credit issuing system according to the first embodiment of the present invention. [Figure 5] FIG. 10 is a diagram illustrating an example of the configuration of a product usage history transmission device according to a second exemplary embodiment of the present invention. [Figure 6] FIG. 10 is a diagram illustrating an example of the configuration of a product usage history transmission device according to a third exemplary embodiment of the present invention. [Figure 7] FIG. 10 is a diagram illustrating an example of the configuration of a product usage history transmission device according to a fourth embodiment of the present invention. [Figure 8] 1 is a diagram showing the configuration of a computer that constitutes a product usage history transmission device of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0023] First, an overview of one embodiment of the present invention will be described with reference to the drawings. Note that the reference numerals in the drawings attached to this overview are attached to each element for convenience as an example to facilitate understanding, and are not intended to limit the present invention to the illustrated form. Furthermore, connecting lines between blocks in the drawings and the like referred to in the following description include both bidirectional and unidirectional lines. Unidirectional arrows are used to schematically indicate the flow of the main signal (data) and do not exclude bidirectionality.

[0024] Figure 1 is a diagram showing an example of the schematic configuration of a credit issuing system according to one embodiment of the present invention. Referring to Figure 1, the credit issuing system 100 includes a product information transmission device 111, a product usage history transmission device 122, a credit issuing device 131, and a blockchain 150. The blockchain 150 may be a distributed ledger.

[0025] The product information transmission device 111 transmits product information of the product to the blockchain 150 via a network. Upon receiving the product information of the product, the blockchain 150 generates a block and registers it in the blockchain 150. The product information may include, for example, specifications related to the reduction of greenhouse gas emissions of the product, the product serial number, and product owner information. The product may be a home appliance such as an air conditioner, a refrigerator, a washing machine, a television, or a lighting fixture, a personal computer, or an electric vehicle.

[0026] The product usage history transmission device 122 automatically transmits the product usage history to the blockchain 150 via the network. When the blockchain 150 receives the product usage history, it generates a block and registers it in the blockchain 150. The product usage history may include, for example, the product usage status and usage time, and the product serial number. Note that if the product specifications stipulate the amount of greenhouse gas emissions reduction that will be achieved by introducing the product, the product usage history may not include the product usage status, but may include the product usage time and the product serial number.

[0027] The credit issuing device 131 verifies the product information of the product registered in the blockchain 150 and the usage history of the product registered in the blockchain 150 via the network, issues a credit based on the verified usage history, and transmits a certificate including the credit to the blockchain 150. When the blockchain 150 receives the certificate, it generates a block and registers it in the blockchain 150. The certificate may include the credit, the product serial number, and their hash values ​​(or a digital signature). The certificate may also include the credit, the product serial number, product owner information, and their hash values ​​(or a digital signature). The credit may be a J-credit, for example.

[0028] Blockchain 150 registers product information, product usage history, and certificates containing credits as a chain of blocks that are difficult to tamper with, so anyone with access to blockchain 150 can easily access the credits that are certified by the difficult-to-tamper certificates registered in blockchain 150.

[0029] As a result, according to one embodiment of the present invention, a credit issuing system 100 can be provided that contributes to enabling users who have purchased a product to verify the usage history of the product and easily utilize the issued credit in small amounts.

[0030] [First embodiment] Next, an example of the schematic configuration of the credit issuing system according to the first embodiment of the present invention will be described with reference to the drawings. Figure 2 is a diagram showing an example of the schematic configuration of the credit issuing system 100 according to the first embodiment of the present invention. In Figure 2, components with the same reference numerals as those in Figure 1 are considered to be the same components, and their description will be omitted.

[0031] 2, the credit issuing system 100 includes a product information transmitting device 111 of a product manufacturer 110, a product usage history transmitting device 122 arranged in a product 121 purchased by a product purchaser 120, a credit issuing device 131 of a certification authority 130, a network 140, and a blockchain 150. Note that the product usage history transmitting device 122 may be arranged outside the product 121 and connected to the product 121.

[0032] The blockchain 150 includes a block generation unit 151 and a registration information reading unit 152. Upon receiving product information about the product 121 transmitted from the product information transmission device 111, the usage history of the product 121 transmitted from the product usage history transmission device 122, and the certificate transmitted from the credit issuing device 131, the block generation unit 151 generates blocks and registers them in the blockchain 150 as block 153 containing the product information about the product 121, block 154 containing the usage history of the product 121, and block 155 containing the certificate. Note that FIG. 2 conceptually illustrates the information registered in the blockchain, and block 153 containing the product information about the product 121, block 154 containing the usage history of the product 121, and block 155 containing the certificate are shown as separate blocks. However, a single block containing some of the product information, product usage history, and certificate may be generated and registered. Furthermore, a single block may be generated and registered that includes information other than the product information, product usage history, and certificate used in the credit issuing system 100 of the first embodiment of the present invention.

[0033] FIG. 3 is a diagram illustrating an example of the operation of the block generation unit 151 of the blockchain 150 according to the first embodiment of the present invention. The block generation unit 151 generates a block 200 including one or more pieces of received registration information 202, 203 and a hash value 201 of a previous block (parent block). The hash value of the block is calculated by performing a hash value calculation 301 on a value based on the registration information 202, 203 and information 205 including the hash value 201 of the previous block. Note that the hash value of the block does not need to be calculated using all of the registration information 202, 203; it may be calculated using a value based on the registration information 202, 203. The calculated hash value 211 of the block is not registered in the block, but is used as the hash value 211 of the previous block when generating the next block 210. In this way, by calculating the hash value of each block using the hash value of the previous block, a blockchain can be constructed in which blocks that are difficult to tamper with are linked together, thereby enabling registration information that is difficult to tamper with to be registered in each block.

[0034] Next, an example of the general operation of the credit issuing system 100 according to the first embodiment of the present invention will be described. Fig. 4 is a flowchart showing an example of the general operation of the credit issuing system 100 according to the first embodiment of the present invention. The process starts in step S100.

[0035] In step S101, a product purchaser who purchases a product 121 manufactured by the manufacturer 110 registers owner information with the manufacturer 110. The product may be a home appliance such as an air conditioner, a refrigerator, a washing machine, a television, or a lighting fixture, a personal computer, or an electric vehicle.

[0036] In step S102, the product information transmission device 111 of the product manufacturer 110 transmits product information of the product 121 to the blockchain 150 via the network 140. The product information of the product 121 may include specifications related to greenhouse gas emission reduction of the product 121, the serial number of the product 121, and owner information of the product 121. Note that if the specifications related to greenhouse gas emission reduction of the product 121 and the serial number of the product 121 are transmitted as product information, and the owner information is later registered by the product purchaser in the manufacturer 110, the product information transmission device 111 may transmit the product information including the product owner information again.

[0037] In step S103, when the blockchain 150 receives the product information of the product 121 from the product information transmission device 111, the block generation unit 151 generates a block 153 including the product information of the product 121 and registers it in the blockchain 150.

[0038] Next, in step S104, the product usage history transmission device 122 installed in the product 121 purchased by the product purchaser automatically transmits the usage history of the product 121 to the blockchain 150 via the network 140. The usage history of the product 121 may include the usage status and usage time of the product 121, and the serial number of the product 121. Note that if the product specifications of the product 121 stipulate the amount of greenhouse gas emissions reduction that will be achieved by introducing the product, the usage history of the product 121 may not include the usage status of the product 121, but may include the usage time of the product 121 and the serial number of the product 121. Note that the transmission of the usage history of the product 121 may be performed by the product usage history transmission device 122, which is configured by hardware such as an integrated circuit (IC) that is difficult to tamper with and is installed in the product 121, acquiring and automatically transmitting the usage status and usage time of the product 121 and the serial number of the product 121, thereby preventing manual intervention and preventing tampering of the transmitted information.

[0039] In step S105, when the blockchain 150 receives the product usage history of the product 121 from the product usage history transmission device 122, the block generation unit 151 generates a block 154 including the usage history of the product 121 and registers it in the blockchain 150. If the product information of the product 121 and the usage history of the product 121 both include the serial number of the product 121, it becomes possible to associate the product information of the product 121 registered in the block 153 including the product information with the usage history of the product 121.

[0040] In step S106, the credit issuing device 131 of the authentication institution 130 verifies, via the network 140, the product information of the product 121 registered in the blockchain 150 and the usage history of the product 121 registered in the blockchain 150. The usage history is verified by, for example, obtaining the serial number of the product 121 included in the block 154 containing the usage history of the product 121 and the serial number of the product 121 included in the block 153 containing the product information of the product 121, and verifying that the usage history of the product 121 corresponds to the product information of the product 121.

[0041] In step S107, the credit issuing device 131 of the certification authority 130 issues a credit based on the verified usage history. Since the usage history of the product 121 is verified as to which product it is, in step S106, a value related to the actual greenhouse gas emission reduction can be obtained from the specifications related to the greenhouse gas emission reduction of the product 121 and the usage state and usage time of the product 121, and credits can be issued based on this. Note that if the product specifications stipulate the amount of greenhouse gas emission reduction due to the introduction of the product, a value related to the actual greenhouse gas emission reduction can be obtained from the usage time of the product 121, and credits can be issued based on this.

[0042] In step S108, the credit issuing device 131 of the certification authority 130 generates a certificate including the credit. The certificate may include the credit, the serial number of the product 121, and their hash values ​​(or a digital signature using the private key of the certification authority 130 that can be decrypted using the public key of the certification authority 130). The certificate may also include the credit, the serial number of the product 121, product owner information, and their hash values ​​(or a digital signature). The credit may be a J-credit, for example.

[0043] In step S109, the credit issuing device 131 of the certification authority 130 transmits the certificate including the issued credit to the blockchain 150.

[0044] In step S110, when the blockchain 150 receives the certificate from the credit issuing device 131, the block generation unit 151 generates a block 155 including the certificate and registers it in the blockchain 150. The process ends in step S111.

[0045] According to the first embodiment of the present invention, the usage history of products such as home appliances purchased by a purchaser is automatically registered in the blockchain, and a certificate including a credit issued based on the product information and usage history of the product is registered in the blockchain, thereby providing a credit issuance system that contributes to making it easy to use credit in small amounts.

[0046] Furthermore, according to the first embodiment of the present invention, there is an effect that the demand for products that are highly effective in reducing greenhouse gas emissions will increase due to the credit issuing system 100. Furthermore, there is also an effect that manufacturers can collect the usage history of products registered on the blockchain and use it in the development of future products.

[0047] [Second embodiment] Next, a second embodiment of the present invention will be described with reference to the drawings. Fig. 5 is a diagram showing an example of the configuration of a product usage history transmission device according to the second embodiment of the present invention. In Fig. 5, components with the same reference numerals as those in Fig. 2 are considered to be the same components, and their description will be omitted.

[0048] Referring to FIG. 5, a product usage history transmission device 122 configured with hardware such as an integrated circuit (IC) that is difficult to tamper with is disposed in a product 121 purchased by a product purchaser 120. The product usage history transmission device 122 includes a usage time monitoring unit 1221, a usage status monitoring unit 1222, and a usage history transmission unit 1223. The usage time monitoring unit 1221 monitors the time the product 121 is being used. The usage status monitoring unit 1222 monitors the status of the product 121 while it is being used. For example, when monitoring the cooling operation of an air conditioner, the usage status monitoring unit 1222 monitors whether the air conditioner is in cooling operation or idle while it is turned on, and the usage time monitoring unit 1221 monitors the operating time of the air conditioner during cooling operation. The usage history transmission unit 1223 automatically transmits the status monitored by the usage status monitoring unit 1222 and the operating time monitored by the usage time monitoring unit 1221 to the blockchain 150 via the network 140. If the product specifications stipulate the amount of greenhouse gas emissions reduction resulting from the introduction of the product, the usage history transmission unit 1223 may transmit the total operating time monitored by the usage time monitoring unit 1221 to the blockchain 150 via the network 140. The transmission interval may be a predetermined time interval, and the usage time monitoring unit 1221 may transmit the total operating time during that time. Alternatively, the total operating time monitored by the usage time monitoring unit 1221 may be transmitted to the blockchain 150 via the network 140 every time it reaches a predetermined value.

[0049] The product usage history transmission device 122 according to the second embodiment of the present invention can safely and automatically transmit the product usage history to the blockchain 150, preventing manual intervention.

[0050] [Third embodiment] Next, a third embodiment of the present invention will be described with reference to the drawings. Fig. 6 is a diagram showing an example of the configuration of a product usage history transmission device according to the third embodiment of the present invention. In Fig. 6, components with the same reference numerals as those in Fig. 5 are considered to be the same components, and their description will be omitted.

[0051] Referring to FIG. 6, a product usage history transmission device 122 configured with hardware such as an integrated circuit (IC) that is difficult to tamper with is disposed within a product 121 purchased by a product purchaser 120. The product usage history transmission device 122 includes a usage time monitoring unit 1221, a usage status monitoring unit 1222, and a usage history transmission unit 1223. The usage time monitoring unit 1221 and the usage status monitoring unit 1222 perform the same operations as the usage time monitoring unit 1221 and the usage status monitoring unit 1222 of the second embodiment. The usage history transmission unit 1223 has a wireless transmission unit 123 and automatically transmits the usage status monitored by the usage status monitoring unit 1222 and the driving time monitored by the usage time monitoring unit 1221 to a receiving unit 124 connected to a network 140 via a wireless connection 125. Upon receiving the monitored usage status and driving time, the receiving unit 124 automatically transmits the monitored driving time to a blockchain 150 via the network 140. The wireless connection 125 may use a short-range wireless communication technology such as Bluetooth (registered trademark), or a mobile wireless communication system. By using a mobile wireless communication system, the product usage history transmission device 122 according to the third embodiment of the present invention can be installed in an electric vehicle or the like, and the monitored usage status and driving time can be automatically transmitted to the blockchain 150 via the network 140 by a base station serving as the receiving unit 124 connected to the network 140. If the product specifications stipulate the amount of greenhouse gas emissions reduction resulting from the introduction of the product, the usage history transmission unit 1223 may transmit the total driving time monitored by the usage time monitoring unit 1221 to the blockchain 150 via the network 140. The transmission interval may be a predetermined time interval, and the usage time monitoring unit 1221 may transmit the total driving time during that interval. Alternatively, the total driving time monitored by the usage time monitoring unit 1221 may be transmitted to the blockchain 150 via the network 140 whenever the total driving time monitored by the usage time monitoring unit 1221 reaches a predetermined value.

[0052] By using the product usage history transmission device 122 and receiving unit 124 of the third embodiment of the present invention, when the product 121 purchased by the product purchaser 120 is within a wireless communication area of ​​the receiving unit 124, the product usage history can be safely and automatically transmitted to the blockchain 150 without manual intervention. This allows for flexibility in the installation location of the product 121 purchased by the product purchaser 120. Furthermore, by using a mobile wireless communication system, the product usage history transmission device 122 of the third embodiment of the present invention can be installed in an electric vehicle or the like, and the usage history of the electric vehicle can be safely and automatically transmitted to the blockchain 150.

[0053] [Fourth embodiment] Next, a fourth embodiment of the present invention will be described with reference to the drawings. Fig. 7 is a diagram showing an example of the configuration of a product usage history transmission device according to the fourth embodiment of the present invention. In Fig. 7, components with the same reference numerals as those in Fig. 6 are considered to be the same components, and their description will be omitted.

[0054] Referring to Figure 7, the product usage history transmission device 122 of the fourth embodiment of the present invention is configured such that the product usage history transmission device 122 that is placed inside the product 121 purchased by the product purchaser 120 of the third embodiment of the present invention is placed outside the product 121 purchased by the product purchaser 120, a wireless transmission unit 126 is provided in the product 121 purchased by the product purchaser 120, and a wireless receiving unit 127 is provided in the product usage history transmission device 122, and the wireless transmission unit 126 and the wireless receiving unit 127 are connected by a wireless connection 128.

[0055] As an example, if a mobile wireless communication system is used for the wireless connection 125 between the wireless transmitting unit 123 and the receiving unit 124, and a short-range wireless communication technology such as Bluetooth (registered trademark) is used for the wireless connection 128 between the wireless transmitting unit 126 of the product 121 and the wireless receiving unit 127 of the product usage history transmitting device 122, the product usage history transmitting device 122 of the fourth embodiment of the present invention can also be configured as a smartphone or tablet terminal on which an application capable of transmitting product usage history is installed.

[0056] By configuring the product usage history transmission device 122 according to the fourth embodiment of the present invention with a smartphone, tablet terminal, or the like, once the product purchaser 120 purchases the product 121, the credit issuing system 100 can be used with only the smartphone, tablet terminal, or the like. In this way, the product usage history transmission device 122 according to the fourth embodiment of the present invention can provide a product usage history transmission device 122 for a credit issuing system that contributes to making it possible to easily utilize credit in small amounts.

[0057] Furthermore, the procedures shown in the first to fourth embodiments can be realized by a program that causes a computer (9000 in FIG. 8) functioning as each part of the credit issuing system 100 or the product usage history transmission device 122 to realize the functions of each part of the credit issuing system 100 or the product usage history transmission device 122. Such a computer is exemplified by a configuration including a CPU (Central Processing Unit) 9010, a communication interface 9020, a memory 9030, and an auxiliary storage device 9040 in FIG. 8. That is, the CPU 9010 in FIG. 8 executes the above program, and performs the update process of each calculation parameter stored in the auxiliary storage device 9040, etc.

[0058] The memory 9030 is a RAM (Random Access Memory), a ROM (Read Only Memory), or the like.

[0059] That is, each part (processing means, function) of the credit issuing system 100 shown in the first to fourth embodiments or the product usage history transmission device 122 can be realized by a computer program that causes the processor of the computer to execute each of the above-mentioned processes using its hardware.

[0060] Finally, preferred embodiments of the present invention will be summarized. [First form] (See the credit issuing system from the first perspective above) [Second form] In a first aspect of the credit issuing system, the product information includes specifications related to greenhouse gas emission reduction of the product, a serial number of the product, and owner information of the product. It is preferable. [Third Form] In the second type credit issuing system, the usage history of the product includes a product usage time and a serial number of the product. It is preferable. [Fourth Form] In a first form of the credit issuing system, the certificate includes serial numbers of the credit and the product and hash values ​​thereof. It is preferable. [Fifth Form] (See the second aspect of the product usage history transmission device above.) [Sixth Form] (See the third aspect of credit issuance method above.) [7th form] A sixth aspect of the credit issuing method is characterized in that the product information includes specifications related to greenhouse gas emission reduction of the product, a serial number of the product, and owner information of the product. It is preferable. [8th form] In a sixth aspect of the credit issuing method, the usage history of the product includes a product usage time and a serial number of the product. It is preferable. [9th Form] A sixth aspect of the credit issuing method is characterized in that the certificate includes the credit, the serial number of the product, and their hash values. It is preferable. [10th Form] (See the program for the fourth perspective above)

[0061] The disclosures of the above-mentioned patent documents and non-patent documents are incorporated herein by reference. Modifications and adjustments of the embodiments and examples are possible within the scope of the entire disclosure of the present invention (including the scope of the claims), and further based on the basic technical concept thereof. Furthermore, various combinations and selections of the various disclosed elements (including each element of each claim, each element of each embodiment or example, each element of each drawing, etc.) are possible within the scope of the disclosure of the present invention. In other words, the present invention naturally includes various modifications and alterations that would be possible by a person skilled in the art in accordance with the entire disclosure and technical concept, including the scope of the claims. In particular, with regard to the numerical ranges described herein, any numerical value or subrange included within the range should be construed as being specifically described, even if not otherwise specified. [Explanation of symbols]

[0062] 100 Credit Issuance System 110 Manufacturer 111 Product information transmission device 120 product buyers 121 products 122 Product usage history transmission device 123 Radio transmitter 124 Receiver 125 Wireless Connection 126 Radio transmitter 127 Radio receiver 128 Wireless Connection 130 Certification Bodies 131 Credit issuing device 140 Network 150 Blockchain 151 Block Generation Unit 152 Registration information reading unit Block containing product information for 153 product 121 154 Block containing usage history of product 121 155 Blocks containing certificates Blocks 200 and 210 201, 211, 221 Hash value of previous block 202, 203, 212, 213 Registration Information 205, 215 Information containing the previous block's hash value 201 Hash value calculation for blocks 301 and 311 1221 Usage time monitoring section 1222 Usage status monitoring unit 1223 Usage history transmission unit 9000 computers 9010 CPU 9020 Communication Interface 9030 Memory 9040 Auxiliary storage device

Claims

1. a product information transmission device that transmits product information of the product to the blockchain via a network; a product usage history transmission device that automatically transmits the product usage history to the blockchain via the network; a credit issuing device that verifies, via the network, the product information of the product registered on the blockchain and the usage history of the product registered on the blockchain, issues credits to be used for carbon offsetting based on the verified usage history, generates a certificate including the credits, and transmits the certificate to the blockchain; A credit issuing system, wherein the blockchain generates a block upon receiving the product information of the product, the usage history of the product, or the certificate, and registers the block in the blockchain.

2. The credit issuing system according to claim 1 , wherein the product information includes specifications related to greenhouse gas emission reduction of the product, a serial number of the product, and owner information of the product.

3. The credit issuing system according to claim 1 , wherein the usage history of the product includes a product usage time and a serial number of the product.

4. The credit issuing system according to claim 1 , wherein the certificate includes serial numbers of the credit and the product and hash values ​​thereof.

5. A product usage history transmission device that transmits product usage history to the blockchain via a network.

6. A step in which a product information transmission device transmits product information of the product to a blockchain via a network; When the blockchain receives the product information of the product, generating a block and registering it in the blockchain; a step in which a product usage history transmission device automatically transmits the product usage history to the blockchain via the network; When the blockchain receives the usage history of the product, generating a block and registering it in the blockchain; a credit issuing device verifying, via the network, the product information of the product registered in the blockchain and the usage history of the product registered in the blockchain, issuing credits to be used for carbon offsetting based on the verified usage history, generating a certificate including the credits, and transmitting the certificate to the blockchain; A credit issuance method comprising the step of generating a block and registering it in the blockchain when the blockchain receives the certificate.

7. The credit issuing method according to claim 6 , wherein the product information includes specifications related to greenhouse gas emission reduction of the product, a serial number of the product, and owner information of the product.

8. The credit issuing method according to claim 6 , wherein the usage history of the product includes a product usage time and a serial number of the product.

9. The credit issuing method according to claim 6 , wherein the certificate includes serial numbers of the credit and the product and hash values ​​thereof.

10. A program that causes a computer included in a product usage history transmission device to execute a process of transmitting product usage history to a blockchain via a network.

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