KR20220142210A - Adaptive transaction processing node and method for blockchain - Google Patents

Abstract

An embodiment of the present invention discloses an adaptive transaction processing method and a node device of a node device of a blockchain. An adaptive transaction processing method of a node device of a block chain according to an embodiment of the present invention includes: obtaining state information about the block chain; determining the number of participating nodes that satisfy the user's requirements based on the state information on the block chain; selecting, as a participating node, a node to store data as many as the determined number of participating nodes of the block chain from among a plurality of nodes constituting the block chain in consideration of the transaction processing cost; and allowing the user's transaction to be processed by the determined participating nodes.

Description

Blockchain adaptive transaction processing method and node device

The present invention relates to a block chain adaptive transaction processing method, a node device, and a node device to which the method is applied.

Blockchain is a distributed ledger storage and processing platform technology that dramatically improves reliability, irreversibility, availability, and transparency by duplicating shared data and mutual contracts on multiple computing nodes. On the block chain, data and mutual contract contents are collected in block units, mutually verified between computing nodes, and a block stored once is distributed and stored in participating nodes on the block chain to be safely protected from intentional/unintentional defects. These blockchain features have many advantages, such as data copyright protection, data falsification and damage prevention, and overcoming some node defects or hacking.

However, in the blockchain, a lot of computing resources are consumed and the processing speed is lowered because the participating nodes perform mutual verification and distributed storage of data.

In order to solve this problem, conventionally, methods such as sharding, side chain, and off-chain have been used.

● Sharding: This is called sharding or sharding technique, and data is distributed and stored according to criteria that are easy to separate data such as the number of rows in a row. That is, all participating nodes do not duplicate transactions and blocks in the same way, but divide them into groups to process different transactions and blocks. This processing method may be inefficient because it divides the participating nodes regardless of user requirements or regional characteristics.

● Sidechain: A technique for separately configuring sub-chains that operate side by side next to the main chain of the block chain. It works in a way that the nodes of the side chain are added to the nodes of the existing main chain without configuring an independent node of the side chain only. do. In order to prevent the transaction processing speed from slowing down due to the overload of the main blockchain, the sub-chains share the tasks of the main chain.

● Off-chain: This is a method of storing data or processing transactions outside the block chain, such as the existing server, in order to solve the burden of work and privacy problems of the block chain. Off-chain records only core data on the block chain, and data that requires high speed is recorded on the central server of the DApp, not the block chain. Off-chain has advantages such as low fees, high speed, and high transaction throughput, but the transaction history recorded on the off-chain cannot be completely trusted. In other words, off-chain requires a separate external system and is outside the blockchain, so there is a risk that the advantages of blockchain will disappear.

Therefore, in order to increase the aforementioned block chain operation efficiency, the need for a method and apparatus that can adaptively set the participating nodes and storage nodes of the block chain is emerging.

An object of the present invention is to provide a method and apparatus for adaptively setting the number of participating nodes and data storage nodes in consideration of user requirements and computing environments during mutual verification of blockchain participating nodes and data storage.

The problem to be solved by the present invention is not limited to the problem(s) mentioned above, and another problem(s) not mentioned will be clearly understood by those skilled in the art from the following description.

An embodiment of the present invention provides an adaptive transaction processing method of a node device of a block chain, comprising: obtaining state information about the block chain; determining the number of participating nodes that satisfy the user's requirements based on the state information on the block chain; selecting, as a participating node, a node to store data as many as the determined number of participating nodes of the block chain from among a plurality of nodes constituting the block chain in consideration of the transaction processing cost; and allowing the user's transaction to be processed by the determined participating nodes.

In one embodiment, in the step of selecting the participating node, a node representing a company or organization and a node representing a region or domain are preferentially selected over a node selected in consideration of the transaction processing cost do.

In an embodiment, the step of selecting the participating node is characterized in that a node having a minimum difference between a cost when a specific node stores data and a cost when the node does not store data is selected.

In one embodiment, in the step of selecting the participating node, in order to consider the processing cost of the transaction, the average number of updates of data by a transaction of another node between transactions or data inquiry in a specific node, a specific data holding specific data Data retention cost for a node to send a message to another node, transaction cost for a specific node that does not hold specific data to request a transaction from a node with specific data and receive a response, and storage management cost for a specific node to process and store data It is characterized in that the participating nodes are selected based on the

In one embodiment, the state information for the blockchain network includes reliability for each node over time for the plurality of nodes, and the user's requirements are determined by nodes participating in processing a transaction. It is characterized in that it includes the minimum reliability required by the user as the reliability to be obtained.

In one embodiment, the determining of the number of participating nodes includes: determining the minimum number of participating nodes such that the reliability determined using the reliability for each node over time is equal to or greater than the minimum reliability required by the user It is characterized in that it includes.

In another embodiment of the present invention, the block chain node device includes a block chain state monitoring unit for obtaining state information about the block chain; a number of participating nodes determining unit that determines the number of participating nodes that satisfy the user's requirements based on the state information on the block chain; a participating node selecting unit that selects, as a participating node, a node to store data as much as the determined number of participating nodes of the block chain from among a plurality of nodes constituting the block chain in consideration of the transaction processing cost; and a transaction processing unit that allows the user's transaction to be processed by the selected participating nodes.

In one embodiment, the participating node selection unit is characterized in that it preferentially selects a node having a representative of a company or organization and a node representing a region or a domain rather than a node selected in consideration of the processing cost of the transaction.

In an embodiment, the participating node selection unit selects a node having a minimum difference between a cost when a specific node stores data and a cost when the node does not store data.

In one embodiment, the participating node selection unit, in order to consider the processing cost of the transaction, the average number of updates of data by transactions of other nodes between transactions or data inquiry in a specific node, a specific node holding specific data is different Based on the data retention cost to send a message to the node, the transaction cost for a specific node that does not have specific data to request a transaction from a node with specific data and receive a response, and the storage management cost for a specific node to process and store data It is characterized in that the participating nodes are selected.

In one embodiment, the state information for the blockchain network includes reliability for each node over time for the plurality of nodes, and the user's requirements are determined by nodes participating in processing a transaction. It is characterized in that it includes the minimum reliability required by the user as the reliability to be obtained.

In one embodiment, the number of participating nodes determining unit determines the minimum number of participating nodes such that the reliability determined using the reliability for each node over time is greater than or equal to the minimum reliability required by the user .

The present invention uses a block chain adaptive node setting method and apparatus, while satisfying user requirements, and using a minimum amount of computing resources and storage, so resource waste can be prevented and the transaction processing speed of the block chain can be improved.

The present invention monitors the environmental variables of the block chain and adaptively sets the number of participating nodes and storage nodes of the block chain, thereby preventing the phenomenon of excessively wasting computing resources more than necessary.

In addition, after the number of participating nodes is determined, it is possible to cost-effectively determine which node will store data.

1 is a block diagram illustrating a configuration of a node device according to some embodiments.
2 is a block diagram illustrating a configuration of a control unit of a node device according to some embodiments.
3 is a flowchart for explaining the operation of a node device according to an embodiment of the present invention.
4 is a conceptual diagram for explaining an operation of a node device according to an embodiment of the present invention.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected or connected to the other component, but it is understood that other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that the other element does not exist in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that this does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In this specification, "blockchain" refers to a ledger that utilizes a software element consisting of an algorithm in which blocks connected in order in order to secure and maintain integrity negotiate service usage history information using encryption and security technology. It may refer to a distributed P2P (Peer to Peer) system. Here, the distributed P2P system may be a special type of distributed system. In addition, in a P2P system, all nodes in a network can provide resources (processing power, storage space, data or network bandwidth, etc.) to each other without the coordination of a central node. In addition, "blockchain" may refer to a distributed ledger technology in which the ledger that records usage history information is distributed in a P2P network rather than a central server of a specific institution, and nodes in the network record and manage it jointly.

In this specification, a “node” may mean a component within a blockchain network. For example, a node may be a special-purpose computer, a general-purpose computer, a supercomputer, a mainframe computer, a personal computer, a smartphone, a tablet PC. and the like, but is not limited thereto. A “participating node” is a node that participates in transaction processing in a blockchain network, and may refer to a node that validates a transaction that has occurred and stores data about the verified transaction by adding it to the blockchain.

In this specification, a "user" is a person who generates a transaction, and may request that the transaction be processed using the node device constituting the block chain network. As such, an input element that generates a smart contract transaction by a “user” is called a “user requirement” and may include reliability, maximum transaction completion time, maximum transaction processing cost, and the like.

1 is a block diagram illustrating a configuration of a node device according to some embodiments. The node device 100 includes a control unit 130 , a communication unit 140 , and a memory 150 . The node device 100 may further include a user input unit 110 and an output unit 120 . However, the node device 100 may be implemented by more components than the components illustrated in FIG. 1 , or may be implemented by fewer components than the illustrated components.

The user input unit 110 means a means for a user to input data for controlling the node device 100 . For example, the user input unit 110 includes a keypad, a dome switch, and a touch pad (contact capacitive method, pressure resistance film method, infrared sensing method, surface ultrasonic conduction method, integral type). There may be a tension measurement method, a piezo effect method, etc.), a jog wheel, a jog switch, and the like, but is not limited thereto.

According to some embodiments, the user input unit 110 may receive an input for a requirement desired by a user in processing a transaction. Also, the user input unit 110 may receive an input for a transaction processing request.

The output unit 120 may output an audio signal, a video signal, or a vibration signal. Although not shown in FIG. 1 , the output unit 120 may include at least one of a display unit, a sound output unit, and a vibration motor.

According to some embodiments, the output unit 120 may output a result of performing an operation according to a user's transaction processing request. For example, as a user's transaction processing request occurs, a predetermined operation may be performed in the node device 100 , and a result of the predetermined operation may be output through the output unit 120 .

The controller 130 generally controls the overall operation of the node device 100 . For example, the controller 130 may control the user input unit 110 , the output unit 120 , the communication unit 140 , and the like in general by executing programs stored in the memory 150 .

The controller 130 may be configured to process commands of a computer program by performing basic arithmetic, logic, and input/output operations. The command may be provided to the control unit 130 from the memory 150 , or may be received through the communication unit 140 and provided to the control unit 130 . For example, the controller 130 may be configured to execute a command according to a program code stored in a recording device such as a memory.

According to some embodiments, the control unit 130 may determine the minimum number of participating nodes for processing the transaction based on the user's requirement for the transaction and the state information on the block chain network. In addition, the controller 130 may select the determined minimum number of nodes from among a plurality of nodes constituting the block chain network in consideration of the transaction processing cost to process the transaction. A detailed description thereof will be described later with reference to other drawings.

The communication unit 140 may include one or more components that allow the node device 100 to communicate with another node (not shown) or an external device (not shown) included in the block chain network. For example, the communication unit 140 may include a short-distance communication unit, a mobile communication unit, and a broadcast receiving unit.

According to some embodiments, the communication unit 140 may transmit the transaction requested by the user to at least one other node participating in the blockchain network. For example, when a transaction processing request that satisfies a user requirement is generated, the communication unit 140 may transmit the corresponding transaction to the at least one other node to verify the validity of the corresponding transaction.

The memory 150 may store a program for processing and control of the controller 130 , and may store data input to or output from the node device 100 .

According to some embodiments, the memory 150 may store information related to a smart contract and a distributed ledger as information related to a block chain. For example, the memory 150 may be a block chain database that stores all or some blocks of the entire block chain. According to some embodiments, the memory 150 may further store state information about the block chain including the node device 100 . For example, using the state information about the block chain stored in the memory 150, the node device 100 may determine the minimum number of participating nodes that satisfy the user's requirements.

As an example of the memory 150, a flash memory type, a hard disk type, a multimedia card micro type, a card type memory (eg, SD or XD memory, etc.), RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), PROM (Programmable Read-Only Memory), magnetic memory, At least one type of storage medium among a magnetic disk and an optical disk may be used, but the present invention is not limited thereto.

2 is a block diagram illustrating a configuration of a control unit of a node device according to some embodiments. The control unit 130 may be configured to execute program codes for the functions of the block chain state monitoring unit 132 , the number of participating nodes determining unit 134 , the participating node selecting unit 136 , and the transaction processing unit 138 . Such program codes may be stored in a recording device such as the memory 150 . The block chain state monitoring unit 132 , the number of participating nodes determining unit 134 , and the transaction processing unit 138 are separately illustrated to describe each function separately. Accordingly, the control unit 130 includes at least one processor configured to perform the respective functions of the block chain state monitoring unit 132, the number of participating nodes determining unit 134, the participating node selecting unit 136, and the transaction processing unit 138. may include

The block chain status monitoring unit 132 obtains status information about the block chain network. According to some embodiments, the block chain status monitoring unit 132 may periodically obtain status information about the block chain network.

The state information on the blockchain network is information stored in the blockchain state database 200, and refers to information indicating the overall state of the blockchain network. For example, the state information on the blockchain network may include the reliability of each node over time for a plurality of nodes constituting the blockchain network. The reliability of each node over time is determined by the failure rate of the node due to intentional and unintentional defects. Reliability For example, the state information about the block chain network may further include at least one of a block generation period, block generation time required, transaction processing request frequency, and the number of transactions being processed.

The block chain status monitoring unit 132 may obtain status information about the block chain network periodically or in real time from the block chain status database 200 . In some embodiments, the blockchain state database 200 may be implemented in the memory 150 of the node device 100 . In some embodiments, the blockchain state database 200 may be implemented as a separate node constituting a blockchain network other than the node device 100 .

The number of participating nodes determining unit 134 according to some embodiments determines the minimum number of participating nodes that satisfy the user's requirements by using the state information on the blockchain network. In some embodiments, the user's requirement may include a minimum trust required by the user as the trust determined by the nodes participating in processing the transaction. In these embodiments, the number of participating nodes determiner 134 may determine the minimum number of participating nodes such that the reliability determined using the reliability for each node over time is greater than or equal to the minimum reliability required by the user. For example, when the reliability of all nodes constituting the blockchain network is equally r, when determined by n participating nodes,

One) The reliability of the fail-stop defect represents the probability that even at least one node operates normally, and the reliability Rn at this time is calculated as in Equation 1 below.

[Equation 1]

Rn = 1-(1-r) ⁿ

Here, it is assumed that a failure is a natural, unintentional failure, and that the node is stopped (fail-stop) in case of failure.

2) The reliability of the Byzantine defect is calculated as in Equation 2 because it is the probability that a failure occurs in less than a majority of nodes.

[Equation 2]

As the number of participating nodes increases, the reliability of the transaction may increase. Since the reliability of nodes may vary over time, in a period in which the reliability of each node is relatively low, the minimum number of participating nodes may be determined more than in a period in which the reliability of each node is relatively high.

On the other hand, in other embodiments, even when the reliability of participating nodes, the possibility of cyber-infringement, computing power, proximity to data collection, etc. are different, the method of using the minimum blockchain resource while satisfying the user's requirements can be appropriately applied. .

In some embodiments, the user's requirement may include at least one of a maximum transaction completion time and a maximum transaction cost. The transaction processing completion time may mean the time from when a processing request for a transaction is generated until a block including the transaction is added to the blockchain. That is, the transaction processing completion time indicates that a block containing a transaction is created and transmitted to other nodes in the blockchain network, and after the validity of the transaction is verified by the other nodes, the block containing the transaction is transferred to the blockchain. It may mean the time it takes to be added. The transaction cost is a kind of fee for processing a transaction by other nodes, and may mean a cost that a user has to pay.

In some embodiments, the number of participating nodes determining unit 134 determines the minimum number of participating nodes so that the transaction can be completed within the maximum transaction processing completion time requested by the user, using the state information about the blockchain network. can In addition, the number of participating nodes determining unit 134 uses the state information on the blockchain network to complete the transaction within the maximum transaction processing completion time requested by the user at a transaction cost that is less than or equal to the maximum transaction cost requested by the user. The minimum number of participating nodes can be determined.

The participating node selecting unit 136 according to some embodiments selects as many participating nodes as the determined minimum number of participating nodes from among a plurality of nodes constituting the block chain network. In some embodiments, the participating node selection unit 134 may consider a transaction processing cost to select a participating node. For example, consider the average number of data updates (u), data retention cost (cu), transaction cost (cf), and storage management cost (cs) as usage variables.

The average number of updates (u) is the average number of updates of data by transactions (writes) of other nodes between transactions (writes) or data inquiry (reads) in a specific node.

Data retention cost (cu) is the cost of sending messages (transactions and blocks) to a specific node as a specific node holds data.

Transaction cost (cf) is the cost of requesting a transaction from a node that holds data and receiving a response because a specific node does not hold data.

Storage management cost (cs) is the system and storage management cost required for a specific node to process and store data, and can be calculated as a cost per successive access.

Based on the above-mentioned usage variables, a node that minimizes the cost is selected as a participating node by comparing the transaction processing cost when a specific node has data and when it does not.

In an embodiment, the cost when a specific node stores data may be calculated as in Equation 3 below.

[Equation 3]

In one embodiment, the cost when a specific node does not store data may be calculated as in Equation (4).

[Equation 4]

The number of participating nodes determining unit 134 according to an embodiment may require a minimum or maximum number of nodes for reliability and scalability in the block chain. In this case, the participating node selection unit 136 calculates the transaction processing cost and selects the nodes in a small order, but may increase or decrease the number of data storage nodes. For example, if the number of nodes needs to be increased because the number of data nodes is too small, among the nodes excluded from the node selected according to the repair based on the transaction processing cost, the node receives the data at the cost() for storing the data. In the case of not storing, the node with the smallest difference in cost (_) is selected as a participating node, and it is repeated until the number of data storage nodes is satisfied.

In addition to determining the data node in consideration of transaction processing cost and reliability, the participating node selection unit 136 according to other embodiments considers the reputation of users, or has a representative node for each company or organization, a hierarchical structure or a large-scale block Nodes representing regions or domains in the chain can be designated first.

The transaction processing unit 138 according to some embodiments allows the user's transaction to be processed by the determined participating nodes. For example, the transaction processing unit 138 delivers the block to the determined participating nodes so that the validity of the block including the transaction requested by the user is verified, and the validated block is distributed to the determined participating nodes. can be saved.

By using such a node device, it is possible to prevent resource waste and increase the transaction processing speed of the block chain because it uses the minimum computing resources and storage while satisfying the user requirements.

In addition, by monitoring the environmental variables of the block chain and adaptively setting the number of participating nodes and storage nodes of the block chain, it is possible to prevent excessive waste of computing resources more than necessary.

In addition, it is possible to cost-effectively determine which node will store data after the number of participating nodes is determined.

3 is a flowchart illustrating an operation of a node device according to an embodiment of the present invention, and FIG. 4 is a conceptual diagram illustrating an operation of a node device according to an embodiment of the present invention.

3 and 4 , in step S110, a user's request for transaction processing is input to the node device through the user input unit. In this way, the node device can store and monitor the state information about the block chain in memory. Here, the user requirements may include reliability, maximum transaction completion time, maximum transaction processing cost, and the like. State information about the blockchain may include the cycle of the blockchain and the reliability of the node.

In step S120, the node device determines the minimum number of participating nodes that satisfy the user's requirements by using the state information on the block chain.

In some embodiments, the state information for the blockchain network may include reliability for each node over time for a plurality of nodes, and user requirements are determined by nodes participating in processing a transaction. It may include the minimum reliability required by the user as the reliability to be obtained. In some embodiments, it is possible to determine the minimum number of participating nodes such that the reliability determined using the reliability for each node over time is equal to or greater than the minimum reliability required by the user.

In step S130, the node device may select, as the participating nodes, the determined minimum number of participating nodes from among a plurality of nodes constituting the blockchain network based on the transaction cost. In some embodiments, the node device may preferentially select a node in consideration of a user's reputation or a node having a representative of a company or organization, in consideration of a processing cost of the transaction. The node device may receive the user's reputation through the input unit.

Also, in some embodiments, the node device may preferentially select a node representing a region or domain in a hierarchical structure or large-scale block chain over a node selected in consideration of the transaction processing cost.

In step S140, the node device may control the transaction according to the user's request to be processed by the selected participating nodes (result return).

Although the same participating node selection method (all nodes or certain nodes participate) was used to process a transaction in the conventional blockchain, according to an embodiment of the present invention, the service is provided by determining the number of participating nodes according to the user's requirements. A service level agreement (SLA) has become possible on the blockchain as well. In addition, after the number of participating nodes is determined, it is possible to cost-effectively determine which node will store data.

In addition, the user pays the transaction fee according to the requirements, so that the transaction processing cost can be saved.

So far, the present invention has been looked at with respect to preferred embodiments thereof. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention may be implemented in a modified form without departing from the essential characteristics of the present invention. Accordingly, the scope of the present invention is not limited to the above-described embodiments, and should be construed to include various embodiments within the scope equivalent to the content described in the claims.

Claims (12)

In the adaptive transaction processing method of the node device of the block chain,
obtaining state information about the block chain;
determining the number of participating nodes that satisfy the user's requirements based on the state information on the block chain;
selecting, as a participating node, a node to store data as many as the determined number of participating nodes of the block chain from among a plurality of nodes constituting the block chain in consideration of the transaction processing cost; and
Step of allowing the user's transaction to be processed by the determined participating nodes
An adaptive transaction processing method of the blockchain, including
According to claim 1,
The step of selecting the participating node is,
An adaptive transaction processing method of a block chain, characterized in that a node having a representative of a company or organization and a node representing a region or domain are preferentially selected over a node selected in consideration of the processing cost of the transaction.
3. The method of claim 2,
The step of selecting the participating node is,
A block chain adaptive transaction processing method, characterized in that the node with the smallest difference between the cost when a specific node stores data and the cost when the node does not store data is selected.
3. The method of claim 2,
The step of selecting the participating node is,
In order to consider the processing cost of the transaction,
Between transactions or data lookups on a particular node, the average number of updates of data by transactions on other nodes, the cost of data retention for which a specific node with specific data must send a message to another node, and the specific data A block chain adaptive transaction processing method, characterized in that the participating nodes are selected based on the transaction cost for requesting and receiving a transaction from a node with
According to claim 1,
The state information for the blockchain network includes reliability for each node over time for the plurality of nodes,
The user's requirement is a reliability determined by nodes participating in transaction processing, and includes a minimum reliability required by the user.
6. The method of claim 5,
The step of determining the number of participating nodes comprises:
Determining the minimum number of participating nodes such that the reliability determined using the reliability for each node over time is equal to or greater than the minimum reliability required by the user
A block chain adaptive transaction processing method comprising a.
a block chain status monitoring unit that obtains status information about the block chain;
a number of participating nodes determining unit that determines the number of participating nodes that satisfy the user's requirements based on the state information on the block chain;
a participating node selecting unit that selects, as a participating node, a node to store data as much as the determined number of participating nodes of the block chain from among a plurality of nodes constituting the block chain in consideration of the transaction processing cost; and
A transaction processing unit that allows the user's transaction to be processed by the selected participating nodes
A node device in the blockchain that includes
8. The method of claim 7,
The participating node selection unit,
A node device of a block chain, characterized in that a node representing a company or organization and a node representing a region or domain are preferentially selected over a node selected in consideration of the transaction processing cost.
9. The method of claim 8,
The participating node selection unit,
A node device in a blockchain characterized in that the node with the smallest difference between the cost when a specific node stores data and the cost when the node does not store data is selected.
9. The method of claim 8,
The participating node selection unit,
In order to consider the processing cost of the transaction,
Between transactions or data lookups on a particular node, the average number of updates of data by transactions on other nodes, the cost of data retention for which a specific node with specific data must send a message to another node, and the specific data A node device of a blockchain, characterized in that the participating nodes are selected based on the transaction cost for requesting and receiving a transaction from a node with
8. The method of claim 7,
The state information for the blockchain network includes reliability for each node over time for the plurality of nodes,
The user's requirement is a reliability determined by the nodes participating in processing a transaction and includes a minimum reliability required by the user.
12. The method of claim 11,
The number of participating nodes determining unit,
A node device of a block chain, characterized in that the minimum number of participating nodes is determined so that the reliability determined using the reliability for each node over time is equal to or greater than the minimum reliability required by the user.

Images