KR102341254B1 - Blockchain based claim and reward model for lost property - Google Patents

Abstract

A blockchain-based lost and found method is disclosed. In this method, when the owner loses his/her possessions, the lost asset information is created before loss and registered in the smart contract of the blockchain network. Lost and found confirmation step to check whether the lost asset information is registered in the smart contract using the code information obtained by scanning the attached or displayed visual code. and a lost-and-found registration step of registering in the smart contract, and a lost-and-found recovery step in which the owner device provides the lost and found information registered in the smart contract to the owner in order to recover the owner's lost and found.

Description

Blockchain based claim and reward model for lost property}

The present invention relates to a method for recovering lost and found, and more particularly, to a method for recovering lost and found using a block chain and providing compensation therefor.

Most of the lost items have a characteristic that it is difficult to use them to identify the owner through additional information such as the lost time or location. This makes it difficult for the acquirer who obtained the lost and found to implement a method to return the item, and the return process also does not provide any benefit to the acquirer, thereby lowering the motivation for recovering the lost and found. An individual's phone number can be attached to potentially lost possessions to recover lost items, but as the owner's personal information is disclosed, it is weak in terms of protection of personal information.

On the other hand, there is also a plan to support the search for the owner by entrusting the handling of the lost and found by the national agency. However, it becomes difficult for the learner to claim compensation for their contribution to recovery after delegation, which leads to reduced motivation for the recovery effort. Since the method of recovering lost and found remains at the level of notifying the fact of storage of lost and found on the website and the characteristics of the lost and found, the fact that the owner requires a separate effort to search for lost and found also remains a problem.

Domestic Registered Patent Publication No. 10-1888543 (Announced on August 16, 2018)

It is an object of the present invention to provide a technical method that enables easy recovery of lost items while preventing the owner's personal information from being exposed.

In addition, an object of the present invention is to provide a technical method that can induce a motivation for returning the lost and found to the lost and found owner.

The blockchain-based lost and found recovery method according to an aspect includes a lost and found registration step in which the owner device creates lost asset information before loss and registers it in a smart contract of the blockchain network to recover the lost property when the owner loses the property; Lost and found information in the lost and found confirmation step, in which the acquirer device scans the visual code attached or displayed on the lost object acquired by the acquirer, and uses the code information obtained to check whether the lost asset information is registered in the smart contract. When the registration of is confirmed, a lost and found registration step of registering the lost and found information in the smart contract, and a lost and found recovery step in which the owner device provides the owner with the lost and found information registered in the smart contract to recover the owner's lost and found It may include.

The owner device in the lost and found registration step and the owner device in the lost and found recovery step may be different devices.

The owner's device can register a deposit in the smart contract to be paid to the learner as a reward for recovering lost items.

The lost and found registration step is a step of generating a visual code including the owner's block chain account and compensation amount and a secret value for proving the fact that the acquirer has found the lost property, and based on at least part of the data contained in the visual code, the lost asset information It may include the step of generating.

Lost asset information may consist of lost and found information that can confirm the owner's block chain account and compensation amount, and a lost and found identifier that is a key value for access to the lost and found information.

The lost and found confirmation step may include generating a lost and found identifier with code information obtained by scanning a visual code attached or displayed on the lost and found, and verifying the lost and found information registered in the smart contract with the generated lost and found identifier.

In the found item registration step, the lost and found information including the secret value included in the lost and found identifier and code information and the learner's block chain account and lost and found location information is registered in the smart contract, but the secret value is registered in the smart contract as an encrypted value. can

In the step of recovering lost and found, the owner device registers a deposit equivalent to the amount of compensation included in the QR code in the smart contract. Registering the encrypted password with the secret value of the visual code in the smart contract, and the owner device using the secret value to obtain the password from the registered password value in the smart contract and providing it to the owner can

The lost and found recovery step may further include the step of generating, by the owner device, a transaction for sound output in the lost and found itself according to the owner's lost and found confirmation command, so that the sound output is made in the lost and found communication device by the smart contract.

The lost and found may be the owner's device that has performed the lost and found registration step.

The step of recovering lost and found may further include the step of generating a transaction for the owner device to pay the deposit registered in the smart contract to the acquirer's block chain account according to the owner's compensation payment instruction who has recovered the lost property.

On the other hand, the blockchain-based lost and found recovery method performed in the owner's device according to an aspect generates lost asset information to recover the lost property before loss and registers it in the smart contract of the blockchain network when the owner loses his/her possessions. It may include a lost and found registration step, and a lost and found recovery step of providing the owner with lost and found information registered in the smart contract by the acquirer for the owner's lost and found recovery.

On the other hand, the block chain-based lost and found recovery method performed in the acquirer's device according to an aspect uses the code information obtained by scanning the visual code attached or displayed on the lost and acquired by the acquirer to check whether the lost asset information is registered in the smart contract step, and the acquirer device may include the step of registering the lost and found information in the smart contract when the registration of the lost asset information is confirmed through the lost and found confirmation step.

The present invention makes it possible to exchange lost items and rewards without mutual trust, and enables non-face-to-face exchanges without going through an institution. Accordingly, the effect of reducing the operating cost of the lost and found warehouse is also derived.

1 is a block diagram of a block chain-based lost and found recovery system according to an embodiment.
2 is a block diagram of a user device according to an embodiment.
3 is a flowchart illustrating a QR code generation and information registration procedure according to an embodiment.
4 is a procedure diagram for registering lost and found information according to an embodiment.
5 shows an example of searching for lost and found information in a block chain using a QR code.
6 is a diagram illustrating a lost and found recovery procedure according to an embodiment.
7 is a diagram illustrating a procedure for checking whether lost and found items are stored according to an embodiment.
8 is a diagram illustrating the structure of a lost and found compensation and recovery model.
9 is a diagram illustrating an action scenario occurring between an owner and a learner.
10 is a diagram illustrating a state change according to the scenario flow of FIG. 9 .
11 is a diagram illustrating QR code data attached to a lost item.
12 shows an example of an event initially generated by a learner.
13 is an exemplary view of a screen for registering a lost and found report after scanning a QR code on a mobile device.
14 is a diagram illustrating a web screen requesting signal generation as a lost item.
15 shows an example of an event for the owner to check whether the lost property is kept.
16 shows an example of an event that leaves a record for depositing a reward.
17 shows an example of an event in which the fact of providing a password is recorded.
18 shows a web screen for providing a password to an owner.
19 shows an example of an event for recording the fact of reward delivery.

The foregoing and further aspects of the present invention will become more apparent through preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail so that those skilled in the art can easily understand and reproduce it through these examples.

1 is a block diagram of a block chain-based lost and found recovery system according to an embodiment. The owner device 100 and the acquirer device 200 are devices capable of communication and computing used by the owner of the article and the acquirer who has acquired the article, respectively, and are devices used by a user (owner or acquirer). An application for providing a lost and found recovery service based on a block chain may be installed and executed on the owner device 100 and the acquirer device 200 , or the corresponding service may be used based on the web. In addition, it goes without saying that you can use the service using both the app and the web.

The blockchain (blockchain network) 300 is a ledger management technology that has multiple nodes participating and duplicating data existing in a chain-like form. Participants verify transactions from other nodes and collect them to create a single block. Since the generated block includes the hash value of the previous block, if the specific value of the previous block is changed, the hash value of the previous block of the subsequent blocks must be changed, so it is impossible for someone to arbitrarily modify or delete data. In the process of block propagation, several blocks with different hash values may be propagated at the same time. At the moment of occurrence, all blocks are recognized as normal blocks, but over time, only blocks belonging to the most recent chain that have them as parents are recognized as normal blocks.

Due to the fact that individual nodes are the subject of operation and the property of permanently recording data, the focus was initially on the form of e-commerce, but with the advent of Ethereum, various tasks can be performed. The Ethereum platform supports the creation and execution of programs called smart contracts. It is possible to develop a contract that operates on a blockchain platform through its own language called Solidity, and provides an interface called web3 so that it can be executed on the web or in an app, so that users can interact in general applications. Because the contract is executed on the blockchain, the state of the contract cannot be changed as easily as the information recorded on the blockchain, and because it is Turing-complete, the desired flow can be written through conditions and repetition like a general program. Certain flows may require a fee for execution. Since Ethereum is a public blockchain, recorded smart contracts can be accessed and used by anyone.

2 is a block diagram of a user device according to an embodiment. The user devices 100 and 200 may include a processor 110 , a memory 120 , an input/output interface 130 , and a communication module 140 . The processor 110 may include a central processing unit (CPU), a graphic processing unit (GPU), or a microprocessor having one or more processing cores similar thereto. The memory 120 is a non-transitory storage, and may be for storing data and instructions such as a software program, as well as an application for providing a lost and found recovery service. The input/output interface 130 may include a display for providing a visual output such as an LCD screen, and a device for user input such as an audio input module and a touch input module, and the display and the touch input module are integrated into a touch screen. can be provided. The communication unit 140 is a component for data communication with the outside, and may include a Wi-Fi module, a mobile communication module, or a local area network (LAN) adapter. And the processor 110 executes the application stored in the memory to enable the application to provide a lost and found recovery service to the user.

On the other hand, the system according to the above provides a service for returning lost items between users and receiving appropriate compensation for this using the block chain. Lost and found requires the learner to voluntarily perform good deeds, making it difficult to motivate beyond the purpose of recovering lost and found. It is possible to improve the problem situation by operating a lost and found management service or by recording a phone number on the object, but an organization to manage the accumulated lost and found is necessary and cannot motivate the recovery of lost and found. This system attaches a QR code to a lost item, records the QR information on the block chain, provides a method to deliver a notice of acquisition, and allows the acquirer to receive a reward through a smart contract (aka mediator contract or escrow contract) .

3 is a flowchart illustrating a QR code generation and information registration procedure according to an embodiment. The owner device 100 registers the lost asset information in the smart contract for the loss recovery service distributed in the block chain network so that the property can be recovered before it is lost (S100). That is, when the owner device 100 generates lost asset information as a transaction and submits it to the blockchain network, the lost asset information is stored in the smart contract, and the blockchain network 300 calls the smart contract after verifying the transaction. Store the lost asset information in the smart contract (S110).

S100 may include S101 and S102. In S101, the owner device 100 generates a visual code for the possession that is likely to be lost so that it can be found again after being lost. Here, the visual code may be a QR code, hereinafter referred to as a QR code. The owner device 100 receives information to be included in the QR code from the owner and generates a QR code, and the input information includes the owner block chain account (eg, Ethereum account), compensation amount, lost property name, and secret value. can Here, the secret value is used to prove that the acquirer has acquired the owner's lost property. And the QR code can be printed and attached to lost items. If the lost item is an electronic device capable of displaying a screen, the QR code may be separately printed and displayed on the display of the electronic device without being attached. For example, a QR code is displayed on the lock screen.

In S102, the owner device 100 generates lost asset information as a transaction with at least part of the information (owner block chain account, compensation amount, lost property name, secret value) included in the QR code and submits it to the block chain network ( S102). In one embodiment, the lost asset information consists of lost and found information and a lost and found identifier. Lost and found information includes the owner's block chain account, compensation amount, lost and found name, and secret value, but the secret value may be converted into a hash value and included. And the lost and found identifier may be a hash value in which the owner's blockchain account, compensation amount, lost and found name, and secret value are hashed at least once.

4 is a procedure diagram for registering lost and found information according to an embodiment. The acquirer device 200 checks whether the lost asset information is registered in the smart contract using the code information obtained by scanning the QR code attached or displayed on the lost object acquired by the acquirer (S200). When the registration of the lost asset information is confirmed, the acquirer device 200 registers the lost and found information in the smart contract (S210), that is, the acquirer device 200 generates the lost and found information as a transaction and submits it to the blockchain network. Lost and found information is added to and stored in the lost and found information stored in the smart contract, and the block chain network 300 calls the smart contract after verifying the transaction and stores the lost and found information in the smart contract (S220). The lost and found information includes at least a portion of the code information and information input from the acquirer, and may include a secret value included in the code information, information about the lost and found storage location input from the acquirer, and the acquirer's block chain account. Here, the secret value may be converted into a hash value by the acquirer device 200 and included therein.

S200 may include S201 to S203. To explain this, the acquirer device 200 scans the QR code to acquire information (code information) included in the QR code (S201). The obtained code information may be displayed on a display so that the learner can confirm it. The acquirer device 200 generates a lost and found identifier using the code information, and checks the lost and found information registered on the smart contract with the generated lost and found identifier (S202) (S203). In S202 and S203, the acquirer device 200 generates a lost and found identifier as a query and submits it to the blockchain network 300 to check the lost and found information mapped to the lost and found identifier on the smart contract.

5 shows an example of checking lost and found information in a block chain using a QR code. The QR code attached or displayed on the lost item includes owner, secret, item_name, and reward, respectively, which means the owner's block chain account, secret value, name of lost item, and reward amount. Lost and found information (Property) and lost and found identifier (PropertyID) generated with them are as exemplified in FIG. 5 , and are stored (recorded) in a smart contract in Ethereum. The acquirer device 200 scans the QR code attached or displayed on the lost and found, generates a lost and found identifier (PropertyID) with the owner, secret, item_name, and reward obtained through the scan, and uses the generated lost and found identifier in a smart contract in the block chain. Check lost and found information.

6 is a diagram illustrating a lost and found recovery procedure according to an embodiment. The block chain network 300 generates a LostFound event to notify the owner of the fact that the lost item is acquired by calling the smart contract according to the transaction in S210 (S300). Accordingly, the owner device 100 provides the owner with the lost and found information confirmed through the LostFound event so that the owner can know the fact and the storage location of the lost and found (S310). The owner device 100 creates a transaction for depositing the reward to be provided to the learner as an example in the smart contract according to the owner's command and submits it to the block chain network (S320).

The blockchain network 300 generates a RewardDeposited event to notify the acquirer that the reward has been deposited after verifying the transaction (S330). Accordingly, the acquirer device 200 notifies the acquirer of the fact of depositing the reward confirmed through the RewardDeposited event, receives the password for the locker where the lost items are stored from the acquirer, encrypts it with the secret value included in the QR code, and generates the password value as a transaction. Submit to the blockchain network 300 (S340). In one embodiment, the acquirer device 200 generates a value (cipher value) obtained by performing an XOR operation on the secret of the QR code with the locker password, and submits it to the blockchain network 300 .

After verifying the transaction, the blockchain network 300 stores the password value in the smart contract and generates a PasswordGranted event to notify the owner that the locker password has been provided (S350). Accordingly, the owner device 100 converts the password value confirmed through the PasswordGranted event into the locker password using the secret and provides it to the owner (S360). Accordingly, the owner can unlock the locker to recover the lost item. Thereafter, the owner device 100 generates a transaction for paying the deposit to the acquirer according to the owner command and submits it to the blockchain network 300 ( S370 ). Accordingly, the blockchain network 300 calls the smart contract after verifying the transaction, and the called smart contract generates a payment event so that the deposit is transferred to the acquirer's blockchain account (e-wallet address).

7 is a diagram illustrating a procedure for checking whether lost and found items are stored according to an embodiment. 7 is limited to the case where the lost and found is a communication device. The owner checks the lost and found storage location through S310 and then goes to the storage box. Thereafter, the owner device 100 generates a transaction for checking whether the lost item is actually stored in the locker informed by the acquirer according to the owner command and submits it to the blockchain network 300 ( S400 ). The blockchain network 300 calls the smart contract after verifying the transaction, and the called smart contract generates a ValidationSound event for checking lost and found (S410). Accordingly, the lost property 400 outputs a corresponding sound according to the ValidationSound event so that the owner can recognize it (S420). The above steps S400 to S420 may be performed by being placed between S310 and S320 of FIG. 6 .

Meanwhile, the owner device 100 of FIG. 3 and the owner device 100 of FIGS. 6 and 7 may be different devices. In other words, it is not always necessary to use the same device. Without being tied to one device, the owner can carry out the process through the app and/or the web for the lost and found service. This is also true of the learner. In addition, the owner device 100 of FIG. 3 may be lost. In this case, it goes without saying that the owner device 100 of FIG. 3 and the owner device 100 of FIGS. 6 and 7 are different devices.

3 to 7, the owner's subject is expressed as the owner device 100 and the learner's subject is expressed as the learner's device 200. More specifically, a processor or a user application may be expressed as a subject. Here, the user application may be expressed separately as an owner application and a learner application, but may be the same application in fact. That is, depending on whether the user becomes the owner or the learner, the user application is also divided into an owner application and a learner application, but may be the same application. And for the block chain network 300 expressed as a subject, it can be expressed as a block chain node.

The user application uses a hash function, which is a function that outputs a value of a fixed length for any input, and the result obtained through the function is called a hash value. Hash cannot predict the input value based on the output result, and it always returns the same output value for one input value, and the change in the output value cannot be predicted due to the change in the input value. Keccak is a standard SHA-3 algorithm to replace SHA-2, a set of functions designed by the NSA as one of the hash function algorithms. Ethereum also uses the corresponding hash algorithm and uses Keccak256 with 256 bits as output. In this system, by using the characteristics of Hash, it can be used by the learner to prove the fact that he or she has found the lost object. Because Keccak256 uses 256 bits, it has a sufficiently large range, so it is difficult to find an input value that makes a corresponding output value through a brute force attack.

Hereinafter, the blockchain-based lost and found recovery model will be described in more detail. This model uses an application that can be connected to an Ethereum blockchain node through web3 to add one's own Ethereum account and register information of lost possessions (goods) in the blockchain. And the acquirer can receive a reward by delivering the acquired item to the owner. As shown in FIG. 8, a smart contract (escrow contract) is uploaded to Ethereum, and the contract has two roles: Property and Escrow, and these are expressed as Property Component and Escrow Component. Property Component is a CRUD component related to the function of registering and checking lost items, and Escrow Component is a component related to the function of recovering and compensating for lost items.

9 is a diagram illustrating the behavior of the owner and the acquirer, and FIG. 10 is a diagram illustrating a state that changes according to the behavior. The owner records information about the lost item and the amount of compensation in the contract through the application. The fact of acquisition is recorded in the contract by the acquirer, and the owner is informed of the location of the lost object. The owner who confirms the lost item deposits the reward, and the reward is delivered when the learner enters the password for obtaining the lost item. The owner can open the locker and retrieve his or her belongings with the received password.

Hereinafter, the present model will be described in more detail. Before the description, it is to be understood that a user (owner or acquirer) encompasses a user device (owner or acquirer device) or an application running on a user device, and whether or not it refers to an actual user in context can be clearly understood. .

First, registration of lost items and generation of QR codes will be described. The user creates a QR code to attach or display on the lost item in the app. In the QR code, enter the owner's Ethereum account, reward amount, object name, and secret value. These are named owner, reward, item_name, and secret and are stored in JSON format in the QR code of the form shown in FIG. 11 . Based on the data stored in the QR code, information about lost items (lost asset information) must be recorded on the Ethereum blockchain. It can be recorded through the Property.register function, and can be recorded after hashing the secret value used in the QR code twice. The QR code information uploaded to the block chain is named Property, and the key value that can access the property value is named PropertyID.

Property = {owner, h(hsecret)), item_name, reward}

PropertyID = h(h(h(secret)) + { owner, reward })

The original value of the hashed secret value registered in the blockchain is a value that only the owner and the person who read the QR code can know. The unhashed secret value is used by the learner to prove the fact of acquisition.

Describes the process of reporting and verifying lost items. This is a process corresponding to 3 to 6 of FIG. 9 . In this process, when the learner acquires a lost object, the fact of the acquisition and the place to be stored are registered in the block chain, and the owner confirms it. The acquirer scans the QR code when acquiring a lost object, creates a lost and found ID (PropertyID) with the code information obtained through this, and checks the property recorded in the smart contract. If verification is successful, the PropertyID, Secret included in the QR code, Location, which is the location to store the lost item, and your Ethereum account are added to the lost and found information, and Escrow.notifyProperty function is executed to notify the owner of the finding. The function can have the location of the lost and found box, PropertyID, and h(secret) as parameters. As a result of executing the function, a LostFound event in the form of FIG. 12 is generated. Events are short logs that are created so that users can recognize when a smart contract is executed. The function call is generated when Save is pressed after QR Scan in FIG. 13 . The Ethereum-based app detects newly generated events by periodically polling whether there is a newly generated event in the block chain. The owner must read the event and go to the locker indicated in the event to confirm that it contains their lost property. For reference, as confirmed in FIG. 12, the secret value is provided as a hash value (hsecret), and the secret value is not exposed to a third party.

The owner may check the current status of the lost item in the app or the web in which his/her lost item is recorded in advance as shown in FIG. 14 . When a lost item is reported, the property is set to Property Found, and you can check where your item is stored. The owner who has moved to the storage location can check whether his or her lost items are stored with Check Property. This button executes the Property.CheckProperty(PropertyID) function to generate a transaction. The transaction generates a ValidationSound event in the form of FIG. 15 , so that the owner can check whether his or her lost property is properly stored in the storage box. The event includes the lost and found ID and the index number of the sound file the lost item has, and the lost item (device) is verified by emitting a sound that matches the request recorded in the event. The owner may omit the process of checking the storage of his/her lost property depending on circumstances or needs.

Describe the lost and found case (compensation) and recovery process. This is a process corresponding to 7 to 9 of FIG. In this process, the owner deposits a key money, and when the deposit for the lost and found case is registered, the acquirer allows the owner to recover the lost article. The owner must ask the learner for a password to open the locker where his/her lost and found items are stored. In order to show the acquirer that the reward is payable, cryptocurrency (eth) as much as the reward specified in the QR code is deposited in the contract, and a transaction is generated through the Escrow.depositReward(finder, reward) function. An event is generated.

The acquirer can confirm that the deposit is registered in the contract through the RewardDeposited event of FIG. 16 . If the deposit is delivered to the contract, the acquirer provides the password of the locker password (pwd) with the secret of the QR code and XORed it as the password, and changes the owner and the deposit to be jointly owned to prevent the owner from withdrawing the deposit. A PasswordGranted event as shown in FIG. 17 is generated so that the owner can know that the password has been provided through the Escrow.exchangePwReward(xpw) function execution. The acquirer gets joint ownership of the deposit instead of providing a password. Withdrawal using ownership is possible after 8000 blocks, which is about 15 days. The owner can check the password value recorded in the event on the web or app of FIG. 18, and the app or web provides a password value that can be used by the owner by changing the password value. Accordingly, the owner can unlock the locker with the verified password and retrieve the lost items.

After recovering the lost property, the owner releases the reward delivered to the acquirer in an incomplete state, providing the acquirer with a complete reward. Reward delivery is delivered even if the learner does not take a separate action, and a Withdraw() transaction is generated to confirm that the reward has been completely provided, thereby generating a RewardGranted event as shown in FIG. 19 . By the RewardGranted event, the deposit is transferred from the owner's blockchain account to the acquirer's blockchain account. In this case, the learner does not need to wait 8000 blocks. However, if the owner does not generate a RewardGranted event, the acquirer can receive the deposit through the forced function at the time when about fortnight has elapsed in real time.

Meanwhile, the above-described method performed by the user device can be written as a computer program. Codes and/or code segments constituting such a program can be easily inferred by a computer programmer in the art. In addition, such a program is stored in a computer-readable recording medium, read and executed by a PC, so that a blockchain-based user authentication method can be implemented. Such a recording medium may be a magnetic recording medium, an optical recording medium, or the like.

So far, with respect to the present invention, the preferred embodiments have been looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

100: owner device 200: acquirer device
300: Blockchain Network

Claims (23)

The owner device generates a visual code containing the owner's block chain account and compensation amount and a secret value to prove the fact that the owner has found the lost property before the loss so that the owner can recover the lost property if the owner loses the property; generating, by the device, lost asset information including lost and found information in which the owner's block chain account and compensation amount can be verified and a lost and found identifier for access to the lost and found information, based on at least part of the data included in the visual code; and Loss registration step, including the step of the owner device registering the generated lost asset information in a smart contract of the blockchain network;
The acquirer device scans the visual code of the lost object acquired by the acquirer and generates a lost and found identifier with the code information obtained, and the acquirer device checks the lost and found information registered in the smart contract with the generated lost and found identifier. step;
When the lost and found information is confirmed through the lost and found confirmation step, the acquirer device registers the lost and found information including the secret value contained in the lost and found identifier and code information, the acquirer's block chain account and lost and found storage location information in the smart contract; and
The owner device provides the lost and found information registered in the smart contract to the owner; After confirming the deposit registration in the smart contract, the acquirer's device receives the password for unlocking the locker in which the lost items are stored from the acquirer, and the password value encrypted with the secret value included in the visual code is registered in the smart contract. a lost and found recovery step, comprising, by the owner device, obtaining a password for unlocking the locker from the password registered in the smart contract using the secret value and providing the password to the owner;
A block chain-based lost and found recovery method that includes The method of claim 1,
A block chain-based lost and found recovery method in which the owner device in the lost and found registration stage and the owner device in the lost and found recovery stage are different devices. The method of claim 1 or 2, wherein the step of recovering lost and found comprises:
Before the step of registering the deposit in the smart contract, the owner device generates a transaction for sound output in the lost and found stored in the locker itself according to the owner's lost and found confirmation command, so that the sound output is made in the lost and found by the smart contract;
A block chain-based lost and found recovery method further comprising a. 4. The method of claim 3,
Lost and Found is a blockchain-based lost and found recovery method in which the owner's device that has performed the lost and found registration step is a lost item. The method of claim 1 or 2, wherein the step of recovering lost and found comprises:
generating, by the owner device, a transaction so that the deposit registered in the smart contract is paid to the acquirer's block chain account according to the compensation payment instruction of the owner who has recovered the lost property;
A block chain-based lost and found recovery method further comprising a. In the blockchain-based lost and found recovery method performed in the owner device,
Creating a visual code including the owner's block chain account, compensation amount, and secret value for proving the fact that the owner has found the lost property before loss so that the owner can recover the lost property in case the owner loses the property, including in the visual code Creating lost asset information including lost and found information in which the owner's block chain account and compensation amount can be verified and a lost and found identifier for access to the lost and found information based on at least some of the data, and the generated lost asset information Loss registration step including registering in the smart contract of the blockchain network;
The step of providing lost and found information to the owner, including the lost and found identifier and secret value registered in the smart contract by the acquirer's device, and the acquirer's block chain account and lost and found storage location information; Registering a deposit equivalent to the included compensation amount in the smart contract, and after registering the deposit, obtain a password for unlocking the locker in which the lost items are stored from the password value registered in the smart contract by the acquirer device, but use the secret value to obtain the password Lost and found recovery step comprising the step of obtaining a password from and providing it to the owner;
A block chain-based lost and found recovery method that includes 7. The method of claim 6,
A block chain-based lost and found recovery method in which the owner device in the lost and found registration stage and the owner device in the lost and found recovery stage are different devices. 8. The method of claim 6 or 7, wherein the step of recovering lost and found includes:
Before the step of registering the deposit in the smart contract, generating a transaction for sound output from the lost property itself stored in the locker by the acquirer according to the owner's lost and found confirmation command, so that the sound output is made from the lost property by the smart contract;
A block chain-based lost and found recovery method further comprising a. 9. The method of claim 8,
Lost and Found is a blockchain-based lost and found recovery method in which the owner's device that has performed the lost and found registration step is a lost item. 8. The method of claim 6 or 7, wherein the step of recovering lost and found includes:
generating a transaction so that the deposit registered in the smart contract is paid to the acquirer's block chain account according to the compensation payment instruction of the owner who recovered the lost property;
A block chain-based lost and found recovery method further comprising a. In the block chain-based lost and found recovery method performed on the acquirer's device,
A lost and found identification step comprising: generating a lost and found identifier with the code information obtained by scanning the visual code of the lost and found by the acquirer; and confirming the lost and found information registered in the smart contract with the generated lost and found identifier;
When the lost and found information is confirmed through the lost and found confirmation step, the found information registration step of registering the lost and found information, including the secret value included in the lost and found identifier and code information, the acquirer's block chain account and lost and found storage location information in the smart contract; and
After registering the lost and found information in the smart contract, if it is confirmed that the deposit equivalent to the amount of compensation included in the visual code is registered in the smart contract, the acquirer receives the password for unlocking the locker where the found and lost items are stored a lost and found recovery step comprising registering an encrypted value encrypted with a secret value included in the visual code in a smart contract and providing it to the owner;
A block chain-based lost and found recovery method that includes A computer program stored in a computer-readable recording medium to execute the block chain-based lost and found recovery method according to claim 6 or 11 in a computer. delete delete delete delete delete delete delete delete delete delete delete

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