KR20200125279A - User Identification Method Using Block Chain and System thereof - Google Patents

Abstract

A user authentication system is disclosed. According to the present invention, a user authentication method based on blockchain comprises the steps of: when an integrated authentication server receives a user authentication request from a user terminal, transmitting a blockchain verification request to a blockchain network; transmitting, by the block chain network, a block generation request to the user terminal in a directed acyclic graph (DAG) method, and generating a block upon receiving a reply to the request from the user terminal; receiving, by the block chain network, the generated block and performing a blockchain verification approval corresponding to the blockchain verification request; and controlling, by the integrated authentication server, access rights of the user terminal according to the blockchain verification approval.

Description

Blockchain-based user authentication method, system {User Identification Method Using Block Chain and System thereof}

The present invention relates to a block chain-based user authentication method and system, and more particularly, to a user authentication method and system for verifying blocks recorded in a block chain together during single sign-on authentication.

The recent advancement of IT technology has led to the development of high-speed Internet networks, which are different from the past Internet environments. Various Internet services can be accessed in everyday life, and these Internet services are essential elements of our daily life. As the services available to many users diversify, the utility value has also increased. In addition, more information and services are being changed to a web-based form due to the development and dissemination of various smart devices that are portable.

However, web-based services require authentication information from each user, and the requested services can be provided only when authenticated as a legitimate user. Accordingly, from the user's perspective, it is inconvenient to set and remember individual identifiers (IDs) and passwords (PW) for various web services. In addition, as a service company provides several linked services, there has been a problem of separately managing authentication information of duplicate users.

To overcome this problem, the concept of Single Sign-On (SSO) has emerged. SSO is the use of multiple services through a single authentication process, which is called single account login or single authentication. For example, if a user needs to log in again when using an application program such as groupware after logging in to a computer, or when logging in again when using an application program on another server, the user may have to manage multiple IDs and passwords. In the environment where SSO is introduced, users can use all functions with one ID and password.

However, in the case of SSO authentication, since various services can be used through one authentication, if the user authentication information used for SSO authentication is hacked by an attacker, the attacker is authenticated as a legitimate user for all services linked to SSO authentication. There is a problem with acquiring a session.

In addition, in order to solve this problem, multi-factor authentication technology (Something you only have + you only remember) is being introduced in one authentication, but there is a limitation in that it cannot cope with the loss or hacking of a smartphone where the main authentication means are concentrated.

Published Korean Patent Document No. 10-2018-012028

In order to solve the above-described problem, the present invention is to provide a user authentication method using a blockchain authentication server that ensures the privacy and stability of authentication information by storing user authentication information using a blockchain technology.

In order to solve the above problems, a block chain-based user authentication system according to an embodiment of the present invention includes a plurality of service servers each providing a service to an authenticated user based on user information; At least one user terminal receiving the service from the authenticated user; An integrated authentication server for requesting confirmation of the user information according to a request from at least one service server, and allowing access to the service for the user according to access authority information; And a plurality of computing devices, upon receiving a request for confirmation of the user information from the integrated authentication server, transmitting a block generation request to the user terminal using a directed acyclic graph (DAG), and the user And a block chain network that generates a block upon receiving a reply to the request from the terminal and returns the access right information to the integrated authentication server.

When the integrated authentication server receives a user authentication request from the user terminal, it transmits a confirmation request for the user information included in the user authentication request to the blockchain network, and performs verification approval according to the confirmation request in the blockchain network. Upon receipt, the authentication result is transmitted to at least one of the service servers.

According to an embodiment, when the blockchain network receives the user authentication request from the integrated authentication server, it transmits a block length check request to the user terminal that has transmitted the user authentication request, and checks the block length from the user terminal. Upon receipt, transmits a block hash request to a plurality of hash reference nodes, generates the block based on the block hash generated by the hash reference node with the block hash request, and receives the block generated in the user terminal Then, the block length is updated and the access right information is transmitted to the integrated authentication server.

The user terminal receives the block hash from random at least one of the hash referrer nodes, writes it to a block header, and generates the block.

According to another embodiment, the block chain network may transmit the block generation request requesting a response within a predetermined time limit to one of a push notification, a text message, and an email to the user terminal.

When the block chain network receives approval according to the block generation request from the user terminal, it may generate the block and transmit the access permission information to the integrated authentication server.

According to another embodiment, the blockchain network may transmit a block hash confirmation request to the user terminal upon receiving the user information confirmation request.

The block chain network may generate the block and transmit the access permission information to the integrated authentication server upon receipt of the block hash according to the block hash confirmation request from the user terminal.

In order to solve the above-described problem, the block chain-based user authentication method according to an embodiment of the present invention is a step of transmitting a block chain verification request to the blockchain network when the integrated authentication server receives a user authentication request from a user terminal. ; The first node included in the blockchain network transmits a blockchain verification request to the user terminal, and generates a block based on a response to the verification request; Updating a hash value by receiving the generated block by a second node included in the blockchain network; Transmitting, by the first node, a block chain verification approval to the integrated authentication server based on the generated block; And controlling, by the integrated authentication server, access rights of the user terminal according to the block chain verification approval.

According to an embodiment, the first node transmits the block chain verification request to the user terminal by either text message or e-mail, requiring a response within a predetermined time limit, and the user terminal uses a private key to The blockchain verification approval corresponding to the chain verification request can be returned.

According to another embodiment, the first node transmits the block chain verification request including a previously stored hash value to the user terminal, and the user terminal returns the block chain verification approval based on the verification result of the hash value. I can.

In order to solve the above-described problem, a block chain-based user authentication method according to an embodiment of the present invention is a step of transmitting a block chain verification request to the blockchain network when the integrated authentication server receives a user authentication request from a user terminal. ; The block chain network transmitting a block generation request to the user terminal in a directed acyclic graph (DAG) method, and generating a block upon receiving a reply to the request from the user terminal; The block chain network receiving the generated block and performing a block chain verification approval corresponding to the block chain verification request; And controlling, by the integrated authentication server, access rights of the user terminal according to the block chain verification approval.

In the step of generating the block, the first node included in the blockchain network transmits a block length check request to the user terminal according to the block chain verification request, and checks the block length based on a response to the confirmation request. Step to do; The first node requesting a block hash from a second node included in the block chain network when the block lengths match; And receiving, by the user terminal, the block hash from the second node, recording it in a block header, and generating a new block.

According to the user authentication method using the blockchain authentication server of the present invention, it is difficult to copy or forgery/modify user authentication information, and thus privacy can be provided.

In addition, even if any one authentication server causes a problem, user authentication information can be stably managed by utilizing the user authentication information stored in another block chain authentication server.

1 is a block diagram showing a block chain-based user authentication system for explaining embodiments of the present invention.
2 is a flowchart illustrating an initial setup process between a user, an SSO authentication server, and a blockchain authentication server according to an embodiment of the present invention.
3 is a flowchart illustrating a user authentication method using a block chain according to an embodiment of the present invention.
4 is a flowchart illustrating a user authentication method using a block chain according to another embodiment of the present invention.
5 is a flowchart illustrating a user authentication method using a block chain according to another embodiment of the present invention.
6 is a reference diagram for explaining the embodiment of FIG. 5.

DETAILED DESCRIPTION OF THE INVENTION The detailed description of the present invention to be described below refers to the accompanying drawings, which illustrate specific embodiments in which the present invention may be practiced. These embodiments are described in detail sufficient to enable a person skilled in the art to practice the present invention. It is to be understood that the various embodiments of the present invention are different from each other, but need not be mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of the present invention in relation to one embodiment. In addition, it is to be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present invention. Accordingly, the detailed description to be described below is not intended to be taken in a limiting sense, and the scope of the present invention, if properly described, is limited only by the appended claims, along with all scopes equivalent to those claimed by the claims. Like reference numerals in the drawings refer to the same or similar functions over several aspects.

Blockchain, also known as a public transaction ledger, is a technology that prevents hacking that can be traded with virtual currency. Blockchain sends transaction details to all users participating in the transaction, and uses a method to prevent data forgery by collating it with each transaction.

Blockchain is a technology that can be applied not only to virtual currency, but also to securely store various data, and has the effect of reducing enormous costs associated with database maintenance and security.

This blockchain technology has a form in which a block can be generated by any node that receives a transaction transmitted to the network, and a block is adopted from one arbitrary node.

In the storage of the ledger block, it is impossible to insert a new block or modify the ledger block by continuously storing the hash value of the previous block. In addition, it is possible to respond to a distributed denial attack (DDos) by storing the corresponding ledger block distributed among nodes participating in the consensus process.

Meanwhile, the blockchain network is composed of a plurality of nodes. Nodes can be divided into three types of nodes that can perform different roles.

First, the mining node operates on powerful and special hardware such as ASIC, and its purpose is to mine new blocks as quickly as possible. Mining nodes are only possible on a blockchain using a proof-of-work system. This is because the mining work is to solve the PoW puzzle.

The full node checks the validity of blocks mined by the mining node and verifies the transaction. For this to work, we need a full copy of the blockchain. Full nodes can also perform routing operations, helping other nodes find each other. A full node is a node that checks the validity of blocks and transactions and makes decisions, and it is important for a blockchain network to have many full nodes.

The SPV (Simplified Payment Verification) node does not have a full copy of the blockchain, but it can verify transactions (for example, verifying which transactions were sent from a specific address, etc.). The SPV node gets data from the full node and , Multiple SPV nodes can be connected to one full node.

Hereinafter, the user authentication system and method of the present invention will be described based on the blockchain technology implemented with the above characteristics.

1 is a block diagram showing an overall system configuration for implementing embodiments of the present invention.

Referring to FIG. 1, the user authentication system includes a user terminal 10, at least one blockchain authentication server 100, an SSO authentication server 200, and a plurality of service servers 50.

The user terminal 10 is an electronic device in which a user executes a service application provided from the service server 50. The user terminal 10 transmits a user authentication request for any one service to the SSO authentication server 200 and, if authenticated, may receive a corresponding service from the service server 50.

For example, the user terminal 10 receives a request to generate a verification block from the blockchain authentication server 100. At this time, the user terminal 10 may generate a verification block.

As another example, the user terminal 10 receives a block length confirmation request from the blockchain authentication server 100. At this time, the user terminal 10 may check the current block length and reply.

Depending on the embodiment, the user terminal 10 may be a mining node or a non-mining node.

The user terminal 10 may include all mobile devices such as a mobile computer, a PDA/EDA, a mobile phone, a smart phone, a tablet, a portable game machine having a wired or wireless communication function, a digital camera, and a personal navigation system. In addition, the user terminal 10 may include a communication unit that supports transmission and reception of information and a processor that processes information.

The blockchain authentication server 100 is any one of a plurality of servers connected by a block chain, that is, a plurality of nodes belonging to a blockchain network.

As an example, when receiving a verification request for user authentication information from the SSO authentication server 200, the blockchain authentication server 100 transmits a verification block generation request to the user terminal 10, and sends a block for the user authentication information. Generate. When the blockchain authentication server 100 receives approval for the request for generating a verification block from the user terminal 10, it transmits a verification approval notification to the SSO authentication server 200.

As another example, when receiving a verification request for user authentication information from the SSO authentication server 200, the blockchain authentication server 100 transmits a block length check request to the user terminal 10, and the remaining nodes belonging to the blockchain network, That is, a block hash request is transmitted to a plurality of hash referrer nodes.

If any one of the blockchain authentication servers 100 cannot provide the verification block creation request and the verification approval notification, that is, when a failure occurs in the primary blockchain authentication server, the other (Secondary ) The blockchain authentication server takes over the role of the main blockchain authentication server.

When the SSO authentication server 200 receives an authentication request from the user terminal 10, it transmits a verification request for user authentication information to the blockchain authentication server 100. Upon receiving the verification approval notification from the blockchain authentication server 100, SSO approval for the service application is performed. In the present specification, a server that provides user authentication for a plurality of services may be referred to as an SSO server or an integrated authentication server.

The service server 50 is a server that provides any one service application that a user wants to use, and may be a plurality of independent service servers.

Each of the blockchain authentication server 100 and SSO authentication server 200 typically includes electronic information such as computing devices (e.g. computer processors, memory, storage, input and output devices, communication devices, network attached storage, and storage area networks). Storage system) and a computer program may be used to perform desired system performance.

Each of the blockchain authentication server 100 and the SSO authentication server 200 may include a communication unit (not shown) and a processor (not shown). The communication unit is a component for transmitting and receiving information with other electronic devices. The processor may include a hardware configuration such as a micro processing unit (MPU) or a central processing unit (CPU), a cache memory, and a data bus. Also, a software program such as an operating system may be further included.

The user authentication method using the block chain of the present invention through the system configured as described above will be described as follows.

2 is a flowchart illustrating an initial setup process between a user, an SSO authentication server, and a blockchain authentication server according to an embodiment of the present invention.

Referring to FIG. 2, a session formation process between the user terminal 10, the SSO authentication server 200, and the blockchain authentication server 100 for a user to use a single sign-on authentication method. , It is not about the initial setting process between the user terminal 10 and the service server 50.

First, the user terminal 10 initially registers with the SSO authentication server 200 in order to authenticate with single sign-on for a plurality of service applications. The user generates user authentication information including a name, ID, password, and other personal information in the user terminal 10 (S100) and transmits the generated user authentication information to the SSO authentication server 200.

The SSO authentication server 200 generates ID and password authentication information for single sign-on based on the user authentication information (S110), and transmits the generated user authentication information to the blockchain authentication server 100.

When the blockchain authentication server 100, Primary, receives user authentication information from the SSO authentication server 200, it generates a block (S120). The generated block is transmitted to a plurality of remaining blockchain authentication servers (Secondary) connected to the blockchain and stored in all nodes in the blockchain network.

The blockchain authentication server 100 (Primary) transmits the public key and the private key corresponding to the generated block to the user terminal 10.

When the initial authentication setting process of S100 to S120 is completed, a block whenever a service application desired by a user is added thereafter, or whenever a user authentication occurs for a previously registered service application, that is, whenever a service server requiring authentication is required. Blocks of all nodes in the chain network are also updated. This will be described in detail in FIGS. 2 to 6 respectively.

3 is a flowchart illustrating a user authentication method using a block chain according to an embodiment of the present invention.

The user authentication method shown in FIG. 3 is an embodiment when a user wants to authenticate to any one service using a plurality of user terminals 10.

When the user requests user authentication for the service application through the user terminal 10 (S201), the SSO authentication server transmits a block chain creation request to the blockchain network based on the received user authentication request (S202) ( S203). In this case, the SSO authentication server may extract the user's ID and password from the received user authentication request.

The blockchain network transmits a block chain verification request to the user terminal based on the block chain creation request from the first node (Primary). At this time, the block chain verification request may be transmitted to the user terminal to request a response within a predetermined time limit with any one of a push notification, a text message, and an email.

The user terminal returns the blockchain verification result to the first node within a predetermined time limit with any one of push notification, text message, and email. In other words, it is possible to respond to approve or reject the block creation authority. The blockchain verification result may be approved with a private key stored in the user terminal (S204).

When the first node of the blockchain network obtains the block creation authority according to the response of the user terminal, since a transaction has occurred, it generates a block (S205).

On the other hand, when the blockchain network receives a user authentication request from the user terminal at the second node (Secondary, hash referrer node), the first node fails to obtain the right to create the ledger for the first node. It can perform the same role in the same way.

When a block is generated in the first node, the second nodes, that is, the hash reference group, receive the generated block (S206).

The SSO authentication server approves single sign-on (SSO) for the user authentication request based on the block generated in the first node, and controls access rights to the service (S207). The result of the SSO approval and access authority control, that is, authentication approval is also provided to the service server (S208), so that the user can receive a service from the service server in the user terminal.

4 is a flowchart illustrating a user authentication method using a block chain according to another embodiment of the present invention.

The user authentication method illustrated in FIG. 4 is an embodiment in which a user logs in from a fixed device, and uses user authentication in a poor network environment.

When the user requests user authentication for the service application through the user terminal 10 (S301), the SSO authentication server transmits a block hash verification confirmation request to the blockchain network based on the received user authentication request (S302). (S303). In this case, the SSO authentication server may extract the user's ID and password from the received user authentication request.

The blockchain network transmits a block chain verification request to a user terminal based on the block hash verification verification from a first node (Primary). At this time, the blockchain network can request verification from the user terminal through the existing block hash connection value.

The user terminal checks the block hash by comparing the verification request with a block hash value known to the user terminal, and returns a block chain verification result to the first node. That is, a response to approve or reject the block creation authority may be performed (S304).

When the first node of the blockchain network obtains the block creation authority according to the response of the user terminal, since a transaction has occurred, it generates a block (S305).

On the other hand, when the blockchain network receives a user authentication request from the user terminal at the second node (Secondary, hash referrer node), the first node fails to obtain the right to create the ledger for the first node. It can perform the same role in the same way.

When a block is generated at the first node, the second nodes, that is, the hash reference group, receive the generated block (S306).

The SSO authentication server approves a single sign-on (SSO) for a user authentication request based on a block generated in the first node, and controls access rights to the service (S307). The result of SSO approval and access authority control, that is, authentication approval, is also provided to the service server (S309), so that the user can receive a service from the service server at the user terminal (S308).

5 is a flowchart illustrating a user authentication method using a block chain according to another embodiment of the present invention, and FIG. 6 is a reference diagram for explaining the embodiment of FIG. 5.

The user authentication method shown in FIG. 5 is an embodiment of user authentication using a plurality of user terminals as SPV nodes, that is, hash referrer nodes.

Referring to FIG. 5, when user A requests user authentication for a service application through a first user terminal (node A) (S401), the SSO authentication server is based on the received user authentication request (S402), As a block chain verification request to the network, a block length verification verification request is transmitted (S403). In this case, the SSO authentication server may extract the user A's ID and password from the received user authentication request.

The first node of the blockchain network transmits a block length check request to the first user terminal. At this time, blockchain verification is possible through block length comparison.

The first user terminal checks a pre-stored block length (S404). For example, assume that the block length known to the first user terminal is 10.

The first node of the blockchain network requests a block hash from another user terminal (S405). The other user terminal is a hash referrer node and responds to the request of the first node (S406).

The first user terminal randomly receives a block hash from at least one hash referrer node (a second user terminal (node B), a third user terminal (node C), etc.). Then, the received block hash is recorded in the block header to connect the blocks in an acyclic manner, and a block is generated (S407). Referring to FIG. 6, any one hash referrer node records at least one random block hash in the block header, not the block hash of the previous block. In other words, user authentication history is recorded in a block in a non-directional manner. The block length stored by the first user terminal is increased by one. In the above example, the first user terminal updates the block length from 10 to 11.

In other words, since the block chain authentication server and the first user terminal requesting authentication stack blocks together, it is possible to verify the same block length.

If the user authentication history is recorded with directionality rather than non-direction, that is, if authentication is performed through the connectivity of blocks in a private blockchain, there is a possibility that security is compromised through block changes. However, since the block chain authentication server and the first user terminal requesting authentication stack blocks together, there is an effect that verification with the same block length is possible.

The SSO server approves single sign-on (SSO) for the user authentication request based on the block received from the first node, and controls access rights to the service (S411). As a result of the SSO approval and access authority control, that is, the user may be provided with a service from the service server in the user terminal (S412).

As described above, according to the user authentication method using the blockchain authentication server of the present invention, not only SSO authentication but also authentication using a block is performed, thereby improving the security of user authentication. In other words, blocks are continuously created every time a user performs user authentication, so even if an attacker learns user authentication information, even if the block to be verified changes every time and leaks to a third party, the third party cannot use it as valid information. .

In addition, according to the user authentication method using the blockchain authentication server of the present invention, it is difficult to copy or forgery/modify user authentication information, and thus privacy can be provided.

In addition, even if any one authentication server causes a problem, user authentication information can be stably managed by utilizing the user authentication information stored in another block chain authentication server.

The embodiments according to the present invention described above may be implemented in the form of program instructions that can be executed through various computer components and recorded in a computer-readable recording medium. The computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded in the computer-readable recording medium may be specially designed and configured for the present invention, or may be known and usable to those skilled in the computer software field. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes, optical recording media such as CD-ROMs and DVDs, magnetic-optical media such as floptical disks. media), and a hardware device specially configured to store and execute program instructions such as ROM, RAM, flash memory, and the like. Examples of the program instructions include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like. The hardware device may be configured to operate as one or more software modules to perform processing according to the present invention, and vice versa.

In the above, the present invention has been described by specific matters such as specific elements and limited embodiments and drawings, but this is provided only to help a more general understanding of the present invention, and the present invention is not limited to the above embodiments. , Anyone with ordinary knowledge in the technical field to which the present invention pertains can make various modifications and variations from these descriptions.

Therefore, the spirit of the present invention is limited to the above-described embodiments and should not be defined, and all modifications that are equivalently or equivalent to the claims as well as the claims to be described later fall within the scope of the spirit of the present invention. I would say.

10: user terminal
100: Blockchain authentication server
200: SSO authentication server
50: service server

Claims (13)

A plurality of service servers each providing a service to an authenticated user based on user information;
At least one user terminal receiving the service from the authenticated user;
An integrated authentication server for requesting confirmation of the user information according to a request of at least one service server, and allowing access to the service for the user according to access authority information; And
Including a plurality of computing devices, upon receiving a request for confirmation of the user information from the integrated authentication server, transmits a block generation request to the user terminal using a directed acyclic graph (DAG), and the user terminal Including, a blockchain-based user authentication system comprising; a block chain network that generates a block upon receiving a reply to the request from and returns the access right information to the integrated authentication server. The method of claim 1, wherein the integrated authentication server
Upon receiving a user authentication request from the user terminal, a request for confirmation of the user information included in the user authentication request is transmitted to the blockchain network, and upon receiving verification approval according to the confirmation request from the blockchain network, at least one To transmit the authentication result to the service server of, Blockchain-based user authentication system. The method of claim 1, wherein the blockchain network
When receiving the user authentication request from the integrated authentication server, transmits a block length check request to the user terminal that transmitted the user authentication request,
When the block length is confirmed from the user terminal, a block hash request is transmitted to a plurality of hash referrer nodes,
Generates the block based on the block hash generated by the hash reference node in the block hash request,
Upon receiving the block generated by the user terminal, the block length is updated and the access right information is transmitted to the integrated authentication server. The method of claim 3, wherein the user terminal
Receiving the block hash from at least one of the hash referrer nodes randomly, recording the block hash in a block header, and generating the block. The method of claim 1, wherein the blockchain network
To the user terminal to transmit the block generation request that requires a response within a predetermined time limit to any one of a push notification, text message, e-mail, blockchain-based user authentication system. The method of claim 5, wherein the blockchain network
When receiving approval according to the block generation request from the user terminal, the block is generated and the access right information is transmitted to the integrated authentication server. The method of claim 1, wherein the blockchain network
When receiving a request for confirmation of the user information, a block hash confirmation request is transmitted to the user terminal. The method of claim 7, wherein the blockchain network
When the block hash according to the block hash confirmation request is confirmed from the user terminal, the block is generated and the access right information is transmitted to the integrated authentication server. When the integrated authentication server receives the user authentication request from the user terminal, transmitting a block chain verification request to the block chain network;
The first node included in the blockchain network transmits a blockchain verification request to the user terminal, and generates a block based on a response to the verification request;
Updating a hash value by receiving the generated block by a second node included in the blockchain network;
Transmitting, by the first node, a block chain verification approval to the integrated authentication server based on the generated block; And
The integrated authentication server comprises the step of controlling the access right of the user terminal according to the block chain verification approval, blockchain-based user authentication method. The method of claim 9,
The first node transmits the block chain verification request requiring a response within a predetermined time limit to any one of a text message or e-mail to the user terminal, and
The user terminal using a private key to return the block chain verification approval corresponding to the block chain verification request, Blockchain-based user authentication method. The method of claim 9,
The first node transmits the block chain verification request including a hash value previously stored to the user terminal,
The user terminal is to reply to the blockchain verification approval based on the confirmation result of the hash value, blockchain-based user authentication method. When the integrated authentication server receives the user authentication request from the user terminal, transmitting a block chain verification request to the block chain network;
The block chain network transmitting a block generation request to the user terminal in a directed acyclic graph (DAG) method, and generating a block upon receiving a reply to the request from the user terminal;
The block chain network receiving the generated block and performing a block chain verification approval corresponding to the block chain verification request; And
The integrated authentication server comprises the step of controlling the access rights of the user terminal according to the block chain verification approval, blockchain-based user authentication method. The method of claim 12, wherein generating the block comprises:
The first node included in the blockchain network transmits a block length check request to the user terminal according to the block chain verification request, and checks the block length based on a response to the check request;
The first node requesting a block hash from a second node included in the block chain network when the block lengths match; And
The user terminal receives the block hash from the second node, records it in a block header, and creates a new block.

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