KR20210059182A - Node device constituting a block-chain network and an operation method of the node device - Google Patents

Abstract

The present invention relates to a node device constituting a blockchain network for resolving disputes on online postings and an operation method of the node device. According to the present invention, a representative node (121) stores postings (310) in a private block #1, and stores a processing result (e.g., author, posting time, title, etc.) of the postings in a public block #1. When a predetermined time elapses, the representative node (121) generates a random encryption key to encrypt the private block #1, divides the random encryption key into a predetermined number, and distributes and stores the divided pieces to other node devices. According to the present invention, it is possible to store important data for resolving disputes about the online postings using a multi-layered blockchain consisting of the public blockchain and the private blockchain.

Description

Node device constituting a block-chain network and an operation method of the node device for resolving disputes on online posts

The present invention relates to a block chain technology, and more specifically, to a node device constituting a block chain network including a multi-layered block chain for resolving disputes on posts published online, and a method of operating the node device. will be.

In general, electronic money is a digital currency that exists virtually on the Internet. Among these types of electronic money, Bitcoin, a representative electronic money, has a structure that does not have a central device for issuing and managing currencies, and the transaction of Bitcoin is based on a blockchain.

Blockchain is a non-forgery distributed storage created and managed by a peer-to-peer (P2P) network. Blockchain refers to a collection of data blocks created by transactions (a unit operation that cannot be split between two parties) in succession in the form of a chain. Once recorded, data cannot be forged or altered. Blockchain can store confirmed transaction details that occur between users for a certain period of time. Many nodes that make up the blockchain network each have a copy of the blockchain, and transaction details can be disclosed to everyone.

Blockchain is used in various fields, not limited to currency circulation. For example, various fields such as cargo transportation and document storage are being used. In order to be used in such various fields, security for important data is important.However, the block chain proposed to date cannot be forged or altered, but the block is disclosed to anyone, so it can be said that the security is weak in this respect. Of course, important data itself can be encrypted and stored in the blockchain, but the possibility of hacking remains as it is encrypted and exposed to anyone anyway.

In addition, as described above, the block chain cannot forgery or alter the data stored in the block. However, it is necessary to fundamentally delete previously stored data while deleting or modifying the data stored in the block of the blockchain as needed. There is no technology that can fundamentally delete the original data while editing, such as deleting or modifying the data stored in the blockchain.

Meanwhile, as the online social network service (SNS) becomes active, fake news using anonymity is spreading online, and a large amount of various types of information is rapidly circulating online. There are increasing cases of personal defamation caused by malicious posts, and in the case of famous celebrities, there are cases where they are hurt by malicious posts online and make extreme choices, and more and more people are suffering financial and mental damage by fake news. There are insufficient regulations on such fake news or malicious posts. Although a technology that automatically blocks postings containing banned words is being applied, this is a very limited blocking, and fake news, etc., cannot be controlled.

The present invention is proposed in order to solve the above-described problem, and by using a multi-layered block chain consisting of a public blockchain and a private blockchain, it is possible to store important data for resolving disputes on postings online, and to modify or delete them. It is an object of the present invention to provide a node device constituting a blockchain network and a method of operating the node device.

A node device of a blockchain network comprising a plurality of node devices according to an embodiment includes: a communication circuit that communicates with other node devices and communicates with a web server that publishes a post written by a user online; One or more processors; And a memory for storing instructions executable by the one or more processors, wherein the one or more processors independently create a public blockchain and a private blockchain, and a first transaction including the post from the web server Is received and stored in a private block of the private blockchain, the processing result of the first transaction is stored in the public block of the public blockchain, and a first random encryption key is generated to store the first transaction Is encrypted, the first random encryption key is divided by a predetermined number, the divided pieces are distributed to other node devices, and stored, and a second for deleting the post stored in the private block according to the decision to delete the post When a transaction is received from the web server, the private block is copied and temporarily loaded into memory, and the divided fragments are received from other node devices to be decrypted, and the post stored in the decrypted private block is deleted, and the post is Create a child private block by copying the deleted decrypted private block, delete the private block temporarily loaded in the memory, request deletion of the divided fragments to other node devices, and second random encryption A key is generated to encrypt the child private block, the second random encryption key is divided into a predetermined number, and the divided pieces are distributed to other node devices and stored.

The one or more processors simultaneously generate the private block of the private block chain when generating the public block of the public block chain, and record the hash value of the private block simultaneously generated and the hash value of the previous public block in the header of the public block. can do.

The one or more processors may record a hash value of a previous private block in the header of the private block when generating the private block of the private blockchain.

The one or more processors record the second transaction in the public block of the public blockchain, and record the hash value of the child private block in the header of the private block generated simultaneously with the public block recording the second transaction. I can.

When recording the second transaction in the public block, the one or more processors may record the private block storing the first transaction and index information of the child private block generated from the private block together in the public block.

The second transaction includes a signature value using a private key, and the at least one processor transmits the signature value together when requesting a split piece of the first random encryption key to other node devices, and the other node device Upon successful verification of the signature value, the divided pieces of the first random encryption key may be received from the other node devices.

The plurality of node devices include a plurality of representative node devices and a plurality of general node devices, and the plurality of representative node devices synchronize blocks by generating blocks by proof of stake, and the general node device is a block of representative node devices. They are stored in synchronization, and the node device of the blockchain network may be a representative node device.

The one or more processors may include a captured image of the post generated by a deletion requester requesting the deletion of the post, a mosaic-processed image in which a portion of the captured image is mosaic-processed by the deletion requestor, and the deletion requestor. A third transaction including attached deletion reason information is received from the web server and stored in another private block of the private blockchain, and the processing result of the third transaction is stored in another public block of the public blockchain. , Generate a third random encryption key to encrypt the other private block in which the third transaction is stored, divide the third random encryption key by a predetermined number, and distribute the divided fragments to other node devices and store the When a fourth transaction for deleting the captured image is received from the web server according to the final deletion decision of the post, the other private block in which the third transaction is stored is copied, temporarily loaded into memory, and then divided from other node devices. Fragments are received and decoded, the captured image stored in the decrypted other private block is deleted, and a child private block is created by copying the other decrypted private block from which the captured image is deleted, and temporary Delete another loaded private block, request deletion of divided fragments to other node devices, generate a fourth random encryption key to encrypt a child private block generated from the other private block, and the fourth random encryption key By dividing by a predetermined number, the divided pieces may be distributed and stored to other node devices.

The one or more processors store the fourth transaction in a new private block when receiving from the web server a fourth transaction including maintenance reason information written by the first author of the post according to the decision to maintain the post, A fifth random encryption key may be generated to encrypt the new private block, and the fifth random encryption key may be divided into a predetermined number, and divided fragments may be distributed to other node devices and stored.

The final deletion decision and the maintenance decision may be determined as a result of voting by unspecified users for the post.

A method of operating a node device of a blockchain network comprising a plurality of node devices according to an embodiment receives a first transaction including the post from a web server that publishes a post written by a user online. Storing it in a private block of the private blockchain and storing the processing result of the first transaction in the public block of the public blockchain; Generating a first random encryption key to encrypt a private block in which the first transaction is stored, dividing the first random encryption key by a predetermined number, and distributing and storing the divided pieces to other node devices; When a second transaction for deleting the post stored in the private block is received from the web server according to the decision to delete the post, the private block is copied and temporarily loaded into memory, and the divided pieces are removed from other node devices. Receiving and decoding the post and deleting the post stored in the decrypted private block, and creating a child private block by copying the decrypted private block from which the post has been deleted; And deleting the private block temporarily loaded in the memory, requesting deletion of the divided fragments to other node devices, generating a second random encryption key to encrypt the child private block, and generating the second random encryption key. And storing the divided pieces by dividing them into a predetermined number and distributing them to other node devices.

The present invention consists of a multi-layered block chain with a private block chain and a public block chain, and the private block of the private block chain stores online posts and important data for dispute resolution, and the public block stores general data for online posts. It prevents forgery and alteration of the evidence of dispute, and strengthens security by fundamentally blocking external exposure, and in the event of a legal dispute over online posts in the future, it should be used as evidence.

The present invention encrypts the private block storing the important data for dispute resolution with a random encryption key, distributes the random encryption key to node devices constituting the blockchain network, and stores the random encryption key only under the approval of the node devices. It prevents hacking of important data and strengthens security by collecting key pieces to decrypt important data.

The present invention provides the effect of fundamentally deleting the captured image of the online post that was the subject of dispute among the relevant important data stored in the private block when the dispute over the online post is resolved, thereby preventing the possibility of re-distribution of the online post which was the subject of the dispute. Can be blocked.

1 is a diagram showing a system according to an embodiment of the present invention.
FIG. 2 is a diagram showing a block chain of a representative node of FIG. 1.
3 is a diagram illustrating a process of processing data for dispute resolution of online postings in a blockchain network according to an embodiment of the present invention.
4 is a flowchart illustrating a method of storing input data of a deletion requester in a blockchain according to an embodiment of the present invention.
5 is a flowchart illustrating a voting process for an online post of a dispute object according to an embodiment of the present invention.
6 is a flowchart illustrating a method of deleting a captured image from a private block according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail. In the following description, in order to clarify an understanding of the present invention, a description of known techniques for features of the present invention will be omitted. The following examples are detailed descriptions to aid understanding of the present invention, and it will be natural that the scope of the present invention is not limited. Accordingly, an equivalent invention that performs the same function as the present invention will also fall within the scope of the present invention. In the following description, the same identification symbols mean the same configuration, and unnecessary redundant descriptions and descriptions of known technologies will be omitted.

1 is a diagram illustrating a system according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a block chain of a representative node of FIG. 1. The present embodiment with reference to FIG. 1 includes a web server 110, a block chain network 120, and a user terminal 130, which communicate through a communication network 150 to transmit and receive data. The communication network 150 may include a wired communication network and a wireless communication network. The wireless communication network may be a communication network such as Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), wideband code division multiple access (WCDMA), code division multiple access (CDMA), and time division multiple access (TDMA). . The communication network 150 includes a communication network that has not yet been developed at the time of filing of the present application.

The web server 110 is a computing device that allows the user terminal 130 to access and write posts online and provides a service for publishing the written posts online. These services include blog services, cafe services, or online social networking services. The web server 110 does not necessarily need to provide a web-based service. When users write a post, the web server 110 transmits a transaction related to it to the blockchain network 120, stores the post in a private block of the blockchain network 120, and provides basic information of the post, for example, author and title. And the like are stored in a public block of the blockchain network 120. The web server 110 may publish the entire post online, or publish only the title or author of the post online, and may open the post stored in the private block according to the user's selection online. The private block and the public block will be described in detail below.

The web server 110 provides a dispute resolution service for online postings. Here, the dispute resolution service is, when a user other than the author who originally wrote the post requests to delete the post, it notifies the original author, and if the original author does not delete the post, voting by participation of unspecified users It means to delete or keep the post according to the result of voting. In this process, the web server 110 communicates with the blockchain network 120 to store the data generated in the dispute resolution process in the blockchain network 120, and when the dispute is resolved, the original data stored in the blockchain network 120 A transaction for deleting some data including posts is generated and transmitted to the blockchain network 120. The web server 110 includes a memory, one or more processors, and communication circuits, which communicate through one or more communication buses or signal lines. Programs for services provided by the operating system and web server 110 are installed in the memory, and the operating system and programs are executed by one or more processors. The operating system may be a built-in operating system such as Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS or VxWorks, Android, and the like.

The processor of the web server 110, according to the above program, provides a form for creating an online post to the user terminal 130 through a web page when the user terminal 130 is connected, and The created post is published through the website. The processor of the web server 110 may receive a request for deletion of some of the posts posted on the web site from a user other than the original author (hereinafter, a deletion requester). The processor of the web server 110 captures the post in response to the deletion request. A mosaic input form capable of processing a mosaic is provided while providing the captured image to the user terminal 130 of the deletion requester. The processor of the web server 110 generates a mosaic-processed image in which a portion of the captured image is mosaic-processed by receiving a mosaic processing input for a portion of the captured image that needs to be deleted from a deletion requester through a mosaic input form. In addition, the processor of the web server 110 provides an input form for inputting a deletion reason to the user terminal 130 of the deletion requestor to receive deletion reason information including a specific reason for deletion and evidence from the deletion requester. When the input of the deletion reason information is completed, the processor of the web server 110 transmits a transaction including the captured image, the mosaic-processed image, and the deletion reason information to the blockchain network 120.

When a request for deletion of a post is received by the requester of deletion, the processor of the web server 110 processes the post to be temporarily locked so that it is not disclosed, and provides the first author with the information on the reason for deletion received from the requestor. Ask if you want to delete it by sending it. The processor of the web server 110, when the initial author deletes a post requested to be deleted, creates a transaction for the deletion of the post and the captured image for the post with the blockchain network 120, and the blockchain network 120 Transfer to. If the first author deletes the post at the request of the deletion requester before the captured image, etc. is stored in the blockchain network 120, the processor of the web server 110 performs a transaction for deleting only the original post. It can be created and transmitted to the blockchain network 120.

The processor of the web server 110 provides an input form for inputting the reason for the maintenance of the post to the user terminal 130 of the first author when the original author refuses to delete the post, and through the input form Receive reasons for maintenance. The processor of the web server 110 transmits a transaction including the received maintenance reason to the blockchain network 120. In addition, the processor of the web server 110 opens a discussion room including the mosaic-processed image generated by the deletion requester and the reason for maintaining, and votes on whether to delete the post for a certain period of time for unspecified users. Start.

When the voting result is determined to be deleted, the processor of the web server 110 deletes the locked post, and creates a transaction for deleting the captured image for the post and transmits it to the blockchain network 120 do. When the voting result is determined to be maintained, the processor of the web server 110 restores the locked post to its original state and publishes it online. In the event of a legal dispute due to the post in the future, the data stored in the blockchain network 120 may be used as evidence. The processor of the web server 110 may pay predetermined points to users who participated in the voting. Here, the point may be electronic money.

The blockchain network 120 includes a plurality of representative nodes 121 and a plurality of general nodes 122. Here, the nodes 121 and 122 may be a desktop, a laptop computer, a smart phone, or a corporate server, and are computing devices including a memory and a processor. Representative nodes 121 constituting the blockchain network 120 receive a transaction from the web server 110 by providing an API (Application Programmable Interface) to the web server 110. As shown in FIG. 2, the representative nodes 121 operate and store a multi-layered blockchain consisting of a public blockchain 210 connected with public blocks and a private blockchain 220 connected with private blocks.

In the public blockchain 210, a transaction of general data that may be disclosed to the public and a transaction processing result for the private blockchain 220 are stored. Various transactions stored in the public blockchain 210 include, for example, remittance of coins, users' public keys and wallet addresses, basic information of online posts (e.g., title, author, posting date, information of the private block in which the posts are stored) And the like. The private blockchain 220 stores important data that should not be exposed to the outside, ie, transactions of private data, such as user subscription information, users' private keys, content encryption keys, and especially data on online publications that are subject to dispute. do. The private blocks constituting the private blockchain 220 are encrypted with a random encryption key. In addition, the random encryption key is divided into several pieces and distributedly stored only in the representative nodes 121 excluding the general nodes 122 among the nodes constituting the block chain network 120. Block generation technology (eg, proof-of-work or proof-of-stake, hash operation) applied to the public blockchain 210 and the private blockchain 220 may be applied to a known blockchain technology.

Blocks of the blockchains 210 and 220 are composed of a header and a body. The hash value, difficulty, nonce, time stamp, and Merkle Root of the previous block are recorded in the header, and various transaction information and the index of the block are recorded in the body. Here, the block index includes the private block index. That is, when a transaction that stores specific important data in a private block occurs, the transaction information is recorded in the body of the public block, and the index for the private block in which the important data corresponding to the transaction is recorded is the body of the public block. Is written in. Therefore, when a search for specific important data is requested, a private block storing the specific important data can be found by referring to the index. When a public block constituting the public blockchain 210 is generated, a private block constituting the private blockchain 220 is also generated at the same time. In the header of the public block, the hash value of the previous block and the hash value of the private block generated simultaneously with the public block are recorded. Accordingly, forgery and alteration of the private block can be prevented. Naturally, the hash value of the previous private block is recorded in the header of the private block.

The representative nodes 121 can communicate with the web server 110 through an open API, and create a block to create a block chain and synchronize it with other representative nodes 121. The representative nodes 121 distribute and store the private block by dividing the divided fragments of the encrypted random encryption key, and after verifying the integrity of the representative node 121 requested at the request of any one representative node 121, It returns the divided fragment of the held random encryption key. The representative nodes 121 do not store the divided pieces of the random encryption key in the blockchain, but store them in a separate local storage, and manage the relationship information between the random encryption key and the private block. The general nodes 122 are not responsible for the subscription processing of the blockchain service, the creation of the wallet, and the generation and storage of random encryption keys among the operations of the representative node 121, but only store a copy of the blockchain. .

As described above, the random encryption key is a key for encrypting a private block that stores important data, such as a content encryption key and data on online postings subject to dispute. Each private block in which important data is stored has a different random encryption key. Meanwhile, identification information of each private block in which important data is stored is stored in the public block, so that the representative nodes 121 can identify information on the private block in which specific important data is stored in the public block.

The representative nodes 121 include a memory, a memory controller, one or more processors (CPU), a peripheral interface, an input/output (I/O) subsystem, a display device, an input device, and a communication circuit. These components communicate via one or more communication buses or signal lines. The various components may be implemented in hardware, software, or a combination of both hardware and software, including one or more signal processing and/or application specific integrated circuits.

The memory may include high-speed random access memory, and may also include one or more magnetic disk storage devices, nonvolatile memory such as flash memory devices, or other nonvolatile semiconductor memory devices. In some embodiments, the memory is a storage device that is located remotely from one or more processors, such as a communication circuit, the Internet, an intranet, a local area network (LAN), a wide LAN (WLAN), a storage area network (SAN), and the like, Or a network attached storage device accessed through a communication network (not shown), such as a suitable combination thereof. Access to the memory by other components of the representative node, such as the processor and peripheral interfaces, can be controlled by the memory controller. Private blockchains and public blockchains can be stored in memory.

The peripheral interface connects the input/output peripheral devices of the representative nodes 121 to the processor and the memory. One or more processors execute various software programs and/or a set of instructions (instructions) stored in a memory to perform various functions for the representative nodes 121 and process data. In some embodiments, the peripheral interface, processor, and memory controller may be implemented on a single chip, such as a chip. In some other embodiments, they may be implemented as separate chips. The I/O subsystem provides an interface between the input/output peripherals of the representative node, such as display devices and input devices, and peripheral interfaces.

The processor is a processor configured to perform an operation related to the representative nodes 121 and execute instructions, for example, receiving and manipulating input and output data between components of the representative nodes 121 by using instructions retrieved from the memory. Can be controlled. In some embodiments, the software component has an operating system, a graphics module (instruction set) and an Innocoin program (instruction set) mounted (installed) in a memory. The operating system may be, for example, a built-in operating system such as Darwin, RTXC, LINUX, UNIX, OS X, WINDOWS or VxWorks, Android, etc., and general system tasks (e.g., memory management, storage Device control, power management, etc.) to control and manage various software components and/or devices, and facilitate communication between the various hardware and software components. The graphics module includes several well-known software components for presenting and displaying graphics on a display device. The term “graphics” refers to any object that can be displayed to a user, including, without limitation, text, web pages, icons (eg, user interface objects including soft keys), digital images, videos, animations, etc. Includes. According to a program stored in the memory, one or more processors perform operations described with reference to the following drawings. Preferably, the program may be a smart contract.

The communication circuit can perform wireless or wired communication. The communication circuit converts electrical signals into electromagnetic waves and vice versa, through which they can communicate with communication networks, other mobile gateways and communication devices. Communication circuits include, but are not limited to, antenna systems, RF transceivers, one or more amplifiers, tuners, one or more oscillators, digital signal processors, CODEC chipsets, subscriber identity module (SIM) cards, memory, etc. A well-known circuit for performing this function may be included. The communication circuit is by means of the Internet, intranet and network and/or wireless network such as cellular telephone network, wireless LAN and/or metropolitan area network (MAN), and short-range wireless communication called the World Wide Web (WWW). Can communicate with other devices. Wireless communication includes Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), wideband code division multiple access (WCDMA), code division multiple access (CDMA), time division multiple access (TDMA), voice over Internet (VoIP). Protocol), Wi-MAX, Bluetooth, Zigbee, Near Field Communication (NFC), or any other suitable communication protocol, including communication protocols not yet developed at the time of filing of this application. Any of a plurality of communication standards, protocols, and technologies that are not limited thereto may be used.

3 is a diagram illustrating a process of processing data for dispute resolution of online postings in a blockchain network according to an embodiment of the present invention.

As shown in FIG. 3, the representative node 121 constitutes a public blockchain made of public blocks and a private blockchain made of private blocks. The representative node 121 simultaneously generates the private block even if there is no important data to be stored when the public block is generated, and records the hash value of the private block in the header of the public block. Accordingly, the hash value of the previous public block and the hash value of the previous private block are associated with the header of the next public block. The representative node 121 generates a random encryption key for the private block, encrypts the private block using the random encryption key, and then divides the random encryption key to distribute the divided fragments to other representative nodes 121 And save it.

Referring to FIG. 3, when generating the public block #1 and the private block #1, the representative node 121 may receive a transaction for storing a post from the web server 110. The representative node 121 stores the post 310 in the private block #1, and stores the result (eg, author, posting time, title, etc.) related to the processing of the post in the public block #1. The representative node 121 generates a random encryption key after a certain period of time to encrypt the private block #1, divides the random encryption key by a predetermined number, and distributes and stores the divided fragments to other node devices.

Meanwhile, the representative node 121 is stored in the private block #1 from the web server 110 when generating public block #NM-1 (N and M are natural numbers and N>M) and private block #NM-1. Receiving a transaction including a captured image of an online post, a mosaic-processed image in which a portion of the captured image was mosaic-processed by a deletion requester who requested deletion of the online post, and information about the reason for deletion attached by the deletion requester Stored in private block #NM-1. In FIG. 3, in the private block #N-M-1, reference number 320 is the captured image, reference number 330 is the mosaic-processed image, and reference number 340 is the deletion reason information. The transaction includes a signature value using the private key of the web server 110. The representative node 121 stores the processing result of the corresponding transaction in public block #N-M-1, so that it is possible to know that the corresponding transaction is stored in private block #N-M-1. The representative node 121 generates a random encryption key after a certain period of time to encrypt the private block #NM-1, divides the random encryption key by a predetermined number, and distributes the divided fragments to other node devices and stores it. do.

When generating the public block #NM and the private block #NM, the representative node 121 receives a transaction from the web server 110 that includes the reason for maintaining the post written by the first author of the online post that is the subject of dispute, and , Store the transaction in private block #NM. Reference numeral 350 in FIG. 3 is the reason for the maintenance. The representative node 121 encrypts the private block #NM by generating a new random encryption key for encrypting the private block #NM after a certain period of time elapses, and dividing the random encryption key into a predetermined number to divide the divided pieces. It is distributed and stored to other node devices.

Referring to FIG. 3, when the representative node 121 generates the public block #N and the private block #N, among data stored in the private block #NM, the reason for maintaining the post created by the original author 350 is deleted. And a Modify transaction related to the addition. Likewise, the modified transaction includes the signature value of the subject that generated the transaction, that is, the web server 110. The representative node 121 copies the private block #N-M and temporarily loads it into the memory, and then receives divided pieces of a random encryption key capable of decrypting the private block #N-M from other representative nodes 121. Likewise, when the signature value is successfully verified, the divided fragment is received. The representative node 121 decrypts the private block #NM temporarily loaded into the memory using the received divided fragment, and then deletes the requested data 350 among the data stored in the decrypted private block #NM, and requests additional After adding the created data 360, the private block #NM is copied to create a child private block #NM. In addition, the representative node 121 deletes the private block #N-M temporarily loaded in the memory, and transmits a request to delete the divided fragment of the random encryption key for the private block #N-M to the other representative nodes 121. Therefore, since a random encryption key for decryption cannot be generated for the private block #N-M, the private block #N-M is essentially deleted. Meanwhile, the representative node 121 generates a random encryption key for the child private block #NM, encrypts the child private block #NM, divides the random encryption key by a predetermined number, and divides the divided fragments to other node devices. Distributed and stored. Since the modification transaction occurred when the public block #N and the private block #N are generated, the representative node 121 records the modified transaction in the public block #N, and the hash value of the child private block #NM is the private block # Record in N. Accordingly, the hash value of the previous public block #N-1, the hash value of the private block #N, and the hash value of the child private block #N-M are associated with the header of the public block #N.

The representative node 121, when generating the public block #N+1 and the private block #N+1, the original post 310 stored in the private block #1 and private according to the final deletion decision of the online post of the dispute object. A deletion transaction for deletion of the captured image stored in block #NM-1 is received from the web server 110. The deletion transaction includes the subject requesting deletion, that is, a signature value using the private key of the web server 110.

The representative node 121 copies the private block #1 and temporarily loads it into the memory, and then receives divided pieces of a random encryption key capable of decrypting the private block #1 from other representative nodes. Similarly, the representative node 121 copies the private block #NM-1 and temporarily loads it into the memory, and then divides a random encryption key capable of decrypting the private block #NM-1 from other representative nodes. Receive the pieces. At this time, the representative node 121 transmits the signature value together when requesting the segmentation fragment from other representative nodes, and receives the segmentation fragment from the other representative nodes upon successful verification of the signature value in the other representative nodes. do. Thus, it is possible to prevent deletion of important data due to hacking or the like.

The representative node 121 decrypts the private block #1 and the private block #NM-1 temporarily loaded into the memory using the received divided fragment, and then the original post 310 stored in the decrypted private block #1 and private The captured image 320 stored in block #NM-1 is deleted, and the decrypted private block #1 from which the original post 310 is deleted is copied to create a child private block #1, and the captured image ( 320) is copied to the deleted decoded private block #NM-1 to generate a child private block #NM-1. In addition, the representative node 121 deletes the private block #1 and the private block #NM-1 temporarily loaded in the memory, and requests deletion of the divided fragments of the random encryption keys of the private blocks #1 and #NM-1, respectively. Is transmitted to the other representative nodes 121. Therefore, since a random encryption key for decryption cannot be generated for each of the private blocks #1 and #N-M-1, the private blocks #1 and #N-M-1 are essentially deleted. Therefore, it is impossible to recover the original post and the captured image of the original post on the private blockchain.

Meanwhile, the representative node 121 generates a random encryption key for each of the child private blocks #1 and #NM-1, encrypts the child private blocks #1 and #NM-1, respectively, and stores the random encryption keys. Divided into a predetermined number, the divided pieces are distributed to other node devices and stored. Since the deletion transaction occurred when the public block #N+1 and the private block #N+1 are generated, the representative node 121 records the deletion transaction in the public block #N+1, and the child private block #1 and Each hash value of #NM-1 is recorded in the private block #N+1. Accordingly, the hash value of the previous public block #N, the hash value of the private block #N+1, and the hash value of each of the child private blocks #1 and #N-M-1 are associated with the header of the public block #N+1. In this way, when the dispute over the post is resolved and the deletion transaction is received, the original post and its captured image cannot be restored from the private block at the source and thus become private. If the dispute over the post is not resolved, the original post entered by the requester, its captured image, the mosaic-processed image, the reason for the deletion, and the reason for maintaining it created by the original author are stored in a private block as evidence in case of a legal dispute in the future. Can be used as.

In the embodiment with reference to FIG. 3, the captured image of the original post, the mosaic-processed image, and the reason for deletion are stored in a private block, and when the deletion of the original posts is determined, the corresponding data and the original post are deleted together. It is not limited to this. Before the captured image of the original post, the mosaic-processed image, and the reason for deletion are stored in the private block, the original author may delete the original post at will, or at the request of the deletion requester, the original post may be deleted. In this case, the private block Only the original post is deleted.

4 is a flowchart illustrating a method of storing input data of a deletion requester in a blockchain according to an embodiment of the present invention.

Referring to FIG. 4, in step S401, the web server 110 receives a request for deletion of some posts among posts posted on the web site from the terminal 130 of the deletion requestor. The requestor for deletion is a user other than the original author. In step S402, in response to the deletion request, the web server 110 captures the post to generate a captured image and temporarily locks the post.

In step S403, the web server 110 provides the captured image and the mosaic input form to the terminal 130 of the deletion requester, and in steps S404 and S405, the web server 110, the deletion requestor through the mosaic input form A mosaic processing input for a portion of the captured image that needs to be deleted is received from and a mosaic processing image in which a portion of the captured image is mosaic-processed is generated.

In step S406, the web server 110 provides an input form for inputting a deletion reason to the terminal 130 of the deletion requestor, and in step S407, the web server 110 provides a specific reason and evidence for deletion from the deletion requestor. Receive information on the reason for deletion to be included. In step S408, the web server 110 transmits a transaction including the captured image, the mosaic-processed image, and the deletion reason information to the first representative node of the blockchain network 120.

In step S409, the first representative node stores the transaction received from the web server 110 in a private block. Then, in step S410, the first representative node generates a random encryption key for encrypting the corresponding private block, and encrypts the private block with the random encryption key. In step S411, the first representative node divides the random encryption key, and in step S412 transmits the divided pieces to other representative nodes for distributed storage.

Meanwhile, the first representative node 121 stores the processing result of the transaction in a public block generated at the same time as the private block. Here, the processing result may include the ID of the transaction, the information of the posting, and the processing time of the transaction. In addition, the first representative node 121 records the hash value of the previous private block in the generated private block, and the hash value of the previous public block and the hash value of the generated private block in the public block created at the same time as the private block. Record. Accordingly, the generated public block/private block and the previous public block/private block are correlated.

5 is a flowchart illustrating a voting process for an online post of a dispute object according to an embodiment of the present invention.

As described with reference to FIG. 4, when a deletion request is received for a specific online post, in step S501, the web server 110 transmits the deletion reason information received from the requestor to the terminal 130 of the first author who wrote the post. It asks if you want to delete it by sending it.

In steps S502 and S503, the web server 110 receives a response to the inquiry from the terminal 130 of the original author and checks whether the original author has agreed to delete the post. When the initial author agrees to delete the post and deletes it, in step S504, the web server 110 generates a transaction for deleting the captured image for the post to the block chain network 120 to the block chain network 120. send. Subsequent operations of the blockchain network 120 will be described in detail with reference to FIG. 6 below.

As a result of checking in step S503, if the first author rejects the deletion of the post, in step S505, the web server 110 provides an input form for inputting the reason for maintaining the post to the terminal 130 of the first author. Provides and receives the retention reason via its input form in step S506.

In step S507, the web server 110 transmits a transaction including the received maintenance reason to the first representative node of the blockchain network 120. In step S508, the first representative node stores the transaction received from the web server 110 in a private block. And in step S509, the first representative node generates a random encryption key for encrypting the corresponding private block, and encrypts the private block with the random encryption key. In step S510, the first representative node divides the random encryption key, and in step S511, the divided pieces are transmitted to other representative nodes for distributed storage. The first representative node 121 stores the processing result of the transaction in a public block generated at the same time as the private block. Here, the processing result may include the ID of the transaction, the information of the posting, and the processing time of the transaction. In addition, the first representative node 121 records the hash value of the previous private block in the generated private block, and the hash value of the previous public block and the hash value of the generated private block in the public block created at the same time as the private block. Record. Accordingly, the generated public block/private block and the previous public block/private block are correlated.

On the other hand, in step S513, the web server 110, performs a vote on the posting rejected by the first author to delete. The web server 110 opens a discussion room including the mosaic-processed image generated by the deletion requester and the reason for maintaining the original author, and starts voting on whether to delete the post for a certain period of time for unspecified users. .

When the voting period has elapsed, the web server 110 checks the voting result in step S514. If the voting result is determined to be deleted, in step S503, the web server 110 deletes the locked post, and creates a transaction for deleting the captured image for the post to the blockchain network 120. send. This process will be described in detail below with reference to FIG. 6.

If the voting result is determined to be maintained, in step S515, the web server 110 restores the locked post to its original state and publishes it online. In the event of a legal dispute due to the post in the future, the data stored in the blockchain network 120 may be used as evidence. The web server 110 may provide predetermined points to users who participated in the voting. Here, the point may be electronic money.

6 is a flowchart illustrating a method of deleting a captured image from a private block according to an embodiment of the present invention.

6, in step S601, the first representative node 121 receives a deletion transaction for a captured image stored in a specific private block. The first representative node 121 records the received deletion transaction in a public block generated when the transaction is received. The deletion transaction includes a signature value using the private key of the web server 110 that is the subject of the deletion request.

In step S602, the first representative node 121 searches for a specific private block by using the information included in the deletion transaction. For example, you can search using the number of posts, storage time, and transaction ID. The first representative node 121 may search for a private block storing data to be deleted by referring to the index of the private block for each data recorded in the public block.

In step S603, the first representative node 121 copies the searched specific private block and temporarily loads it into the memory, and in step S604, the first representative node 121 decrypts the specific private block with other representative nodes. Requests and receives fragments of a random encryption key that can be performed. At this time, other representative nodes verify the integrity of the first representative node 121. The first representative node 121 transmits the signature value together when requesting a segmentation fragment from other representative nodes, and receives the segmentation fragment from the other representative nodes upon successful verification of the signature value in the other representative nodes. do.

In step S605, the first representative node 121 decodes the specific private block temporarily loaded into the memory using the received divided fragment, and in step S606, captures a post among data stored in the decoded specific private block. Delete the image.

In step S607, the first representative node 121 creates a child private block by copying the decoded specific private block from which the image is deleted while the post is turned on. And in step S608, the first representative node 121 deletes the temporarily loaded specific private block, and in step S609, sends a request to delete the split fragment of the random encryption key for the specific private block to other representative nodes. send. Accordingly, since a random encryption key for decryption cannot be generated for the specific private block, the specific private block is essentially deleted.

In step S610, the first representative node 121 generates a random encryption key for the child private block to encrypt the child private block, and in step S611, divides the random encryption key by a predetermined number to divide the divided pieces. It is distributed and stored to other representative nodes.

In step S612, the first representative node 121 records the hash value of the child private block in the currently generated private block. Accordingly, a hash value of a previous public block, a hash value of a currently generated private block, and a hash value of the child private block are associated with the header of the currently generated public block.

In the embodiment with reference to FIG. 6, only the deletion of the captured image has been described, but the deletion of the original post stored in the private block is also deleted in the same manner as the method of deleting the captured image described with reference to FIG. 6.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain the technical idea, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention. The method of the present invention as described above may be implemented as a program and stored in a recording medium (CD-ROM, RAM, ROM, floppy disk, hard disk, magneto-optical disk, etc.) in a form that can be read by a computer. This process can be easily performed by a person of ordinary skill in the art to which the present invention pertains, and thus will not be described in detail.

110: web server
120: Blockchain network
121: representative node
122: normal node
130: user terminal
150: Internet network
210: public block
220: private block

Claims (11)

In the node device of a block chain network comprising a plurality of node devices,
A communication circuit that communicates with other node devices and communicates with a web server that publishes a post written by a user online;
One or more processors; And
Including a memory for storing instructions executable by the one or more processors,
The one or more processors,
Each independently creates a public blockchain and a private blockchain, receives a first transaction including the post from the web server and stores it in a private block of the private blockchain, and the processing result for the first transaction is stored in the Stored in a public block of a public blockchain,
Generates a first random encryption key to encrypt the private block in which the first transaction is stored, divides the first random encryption key by a predetermined number, and distributes and stores the divided fragments to other node devices,
When a second transaction for deleting the post stored in the private block is received from the web server according to the decision to delete the post, the private block is copied and temporarily loaded into memory, and the divided pieces are removed from other node devices. It receives and decrypts, deletes the post stored in the decrypted private block, and creates a child private block by copying the decrypted private block from which the post has been deleted,
Delete the private block temporarily loaded in the memory, request deletion of the divided fragments from other node devices, generate a second random encryption key to encrypt the child private block, and set the second random encryption key A node device that divides by the number of and distributes and stores the divided pieces to other node devices. The method of claim 1,
The one or more processors,
A node, characterized in that when the public block of the public block chain is created, a private block of the private block chain is simultaneously generated, and a hash value of the simultaneously generated private block and a hash value of a previous public block are recorded in the header of the public block. Device. The method of claim 2,
The one or more processors,
When generating a private block of the private block chain, a hash value of a previous private block is recorded in a header of the corresponding private block. The method of claim 1,
The one or more processors,
Record the second transaction in a public block of the public blockchain,
And recording the hash value of the child private block in the header of the private block generated simultaneously with the public block recording the second transaction. The method of claim 4,
The one or more processors,
When recording the second transaction in the public block, the private block storing the first transaction and index information of the child private block generated from the private block are recorded together in the public block. The method of claim 1,
The second transaction,
Includes a signature value using a private key,
The one or more processors,
When requesting a split piece of the first random encryption key to other node devices, the signature value is transmitted together, and the first random encryption key from the other node devices when the signature value is successfully verified by the other node devices. Node device, characterized in that receiving the divided pieces of. The method of claim 1,
The plurality of node devices include a plurality of representative node devices and a plurality of general node devices, and the plurality of representative node devices synchronize blocks by generating blocks by proof of stake, and the general node device is a block of representative node devices. Synchronize and store them,
The node device of the block chain network is a node device, characterized in that the representative node device. The method of claim 1,
The one or more processors,
A captured image of the post created by a deletion requester requesting the deletion of the post, a mosaic-processed image in which a portion of the captured image has been mosaic-processed by the deletion requester, and information about the reason for deletion attached by the deletion requester. Receiving a third transaction including from the web server and storing it in another private block of the private blockchain, and storing the processing result of the third transaction in another public block of the public blockchain,
Generates a third random encryption key to encrypt the other private block in which the third transaction is stored, divides the third random encryption key by a predetermined number, and distributes and stores the divided fragments to other node devices,
When a fourth transaction for deleting the captured image is received from the web server according to the final deletion decision of the post, the other private block in which the third transaction is stored is copied and temporarily loaded into memory, and then from other node devices. Receive and decode the divided fragments, delete the captured image stored in the other decoded private block, and create a child private block by copying the other decoded private block from which the captured image has been deleted,
Delete another private block temporarily loaded in the memory, request deletion of divided fragments to other node devices, generate a fourth random encryption key to encrypt a child private block generated from the other private block, and 4 A node device that divides the random encryption key into a predetermined number and distributes and stores the divided pieces to other node devices. The method of claim 8,
The one or more processors,
When a fourth transaction including maintenance reason information written by the first author of the post is received from the web server according to the decision to maintain the post, the fourth transaction is stored in a new private block, and a fifth random encryption key is Generating and encrypting the new private block, dividing the fifth random encryption key by a predetermined number, and distributing and storing the divided fragments to other node devices. The method of claim 9,
The final deletion decision and the maintenance decision,
Node device, characterized in that it is determined as a result of voting by unspecified users for the post. A method of operating a node device of a block chain network comprising a plurality of node devices,
From a web server that publishes a post written by a user online, a first transaction including the post is received and stored in a private block of a private blockchain, and the processing result of the first transaction is disclosed in the public blockchain. Storing in a block;
Generating a first random encryption key to encrypt the private block in which the first transaction is stored, dividing the first random encryption key by a predetermined number, and distributing and storing the divided pieces to other node devices;
When a second transaction for deleting the post stored in the private block is received from the web server according to the decision to delete the post, the private block is copied and temporarily loaded into memory, and the divided pieces are removed from other node devices. Receiving and decoding the post and deleting the post stored in the decrypted private block, and creating a child private block by copying the decrypted private block from which the post has been deleted; And
Delete the private block temporarily loaded in the memory, request deletion of the divided fragments from other node devices, generate a second random encryption key to encrypt the child private block, and set the second random encryption key The operation method comprising the step of dividing by the number of and distributing and storing the divided pieces to other node devices.

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