CN107317842B - NDN-based blockchain synchronization method and device - Google Patents

Abstract

The invention discloses an NDN-based block chain synchronization method and device, belonging to the technical field of communication. The method includes: the user equipment sends a block synchronization request packet to the network node, the name of the block synchronization request packet includes a named data network protocol identifier, an application identifier, a request packet type, and state information of a block chain, and the block synchronization request packet includes The state information of the block chain is used to indicate the height of the block with the highest height in the block chain stored by the user equipment; receive the synchronization data packet returned by the network node, and extract the block in the synchronization data packet and store it in Blockchain database. The synchronization method is an NDN-based blockchain system communication implementation method, which can reduce network traffic, reduce transmission delays, and improve data transmission efficiency.

Description

NDN-based blockchain synchronization method and device

technical field

The present invention relates to the field of communication technology, in particular to a block chain synchronization method and device based on Named Data Networking (NDN).

Background technique

The blockchain system is a decentralized, immutable shared distributed intelligent database. The blockchain was first born in Bitcoin. It is a chained data structure composed of blocks connected in sequence in chronological order, providing technical support for the Bitcoin system. Wherein, each block is also a data block, and each data block contains the information of a bitcoin network transaction, which is used to verify the validity of the information (anti-counterfeiting) and generate the next block.

In the blockchain system, after the user equipment produces a new block, it broadcasts the block. After receiving the block, other user devices in the network will verify its legitimacy; if the verification is passed, the user device will add the block to the local blockchain. In this way, each user device stores a blockchain, and if the system operates correctly, the blockchains of these user devices are the same.

At present, the blockchain system is mainly based on the Transmission Control Protocol/Internet Protocol (TCP/IP) network architecture, and the blockchain system based on the TCP/IP network architecture generally has the following problems:

(1) It is impossible to realize the requirement of complete decentralization. Due to business needs, there are many blockchain systems that require decentralization. For example, one of the most mature projects at present, Bitcoin, is theoretically a completely decentralized pure peer-to-peer (Peer to Peer, P2P) system. However, in actual implementation, considering the difficulty of communication, developers have added super nodes to the system to distribute various types of data to user devices that request connections. The setting of super nodes increases the security risk of Bitcoin, because super nodes can unite to organize fraudulent activities on user equipment. At the same time, this architecture will also lead to excessive load on the super nodes, resulting in the problems that the quality of service cannot be improved and single point of failure.

(2) It is difficult to realize the nearby download function. According to the design, some user devices of the blockchain system will store the latest blockchain of the current system, and when new user devices request to obtain the blockchain, they will return corresponding data, but how to enable new user devices to Obtaining the blockchain from the user device that stores the latest blockchain and is closest to it has always been a problem in the blockchain based on the TCP/IP network architecture.

Contents of the invention

In order to solve the problems existing in the blockchain technology in the prior art, an embodiment of the present invention provides an NDN-based blockchain synchronization method and device.

In the first aspect, the embodiment of the present invention provides a block chain synchronization method based on a named data network, the method includes: the user equipment sends a block synchronization request packet to the network node, and the name of the block synchronization request packet includes Named data network protocol identification, application identification, request packet type, and state information of the block chain, the state information of the block chain is used to indicate the height of the block with the highest height in the block chain stored by the user equipment; receiving The synchronization data packet returned by the network node, and the blocks in the synchronization data packet are extracted and stored in the block chain database.

The embodiment of the present invention performs block synchronization based on the named data network. Due to its blockchain architecture based on the named data network, there is no need to set up super nodes, which avoids the problems caused by setting up super nodes; at the same time, in the named data network In the forwarding process, the block synchronization request packet can be forwarded to multiple other user devices at the same time, and the user device with the closest distance will return the corresponding data packet first, thus realizing the nearest download of the block; in addition, the named When a network node in the data network receives a block synchronization request packet, it can search for its own content storage, and provide the corresponding data packet to the user device, using the content storage of the network node to realize data multiplexing, reducing The data transmission volume and transmission delay.

In an implementation manner of the embodiment of the present invention, the user equipment sends a block synchronization request packet to the network node, including: determining the block with the highest height in the stored block chain, and calculating its hash value; The hash value of the block with the highest height in the block chain is used as the state information of the block chain to generate the block synchronization request packet; and send the block synchronization request packet to the network node.

In this implementation manner, the hash value of the block with the highest height in the stored blockchain is used as the state information of the blockchain, which is convenient for calculation.

In another implementation manner of the embodiment of the present invention, the method further includes: when the synchronization data packet is not received within a set time after the user equipment sends the synchronization request packet, sending the The network node sends a block search request packet, the name of the block search request packet includes a named data network protocol identifier, an application identifier, a request packet type, and a block identifier, and the block identifier is used to indicate the user equipment to search The height of the previous block of the block, the height of the previous block of the block searched by the user equipment is the height of the block with the highest height in the block chain stored by the user equipment; when receiving the network When the search data packet returned by the node, the block in the search data packet is extracted and stored in the blockchain database, and then a new block search request packet is sent, and the block identifier of the new block search request packet is the same as the The block identification of the block search request packet is different; when the search data packet returned by the network node is not received within a predetermined time, the block search request packet is resent.

In another implementation manner of the embodiment of the present invention, the method further includes: receiving a block synchronization request packet sent by another user equipment sent by the network node; according to the block synchronization request packet sent by the other user equipment The status information of the block chain in the block chain, determine the height of the block with the highest height in the block chain stored by the other user equipment; compare the determined block with the highest block height in the block chain stored by the other user equipment The height of the block and the height of the block with the highest height in the block chain stored by the user equipment determine the block that needs to be synchronized by the other user equipment; generate synchronization data according to the block that needs to be synchronized by the other user equipment package and return it to the other user equipment.

In another implementation manner of the embodiment of the present invention, the method further includes: when the user equipment successfully creates a block, broadcasting the block information to network nodes in the network; receiving the block information sent by the network node A block search request packet, the block search request packet is used to request the newly created block of the user equipment; send a search request packet to the network node, the search data packet includes the newly created block of the user equipment .

In the second aspect, the embodiment of the present invention also provides a block chain synchronization method based on a named data network, the method includes: the network node receives the block synchronization request packet sent by the user equipment, and the block synchronization request packet The name includes the named data network protocol identifier, application identifier, request packet type, and blockchain status information, which is used to indicate the height of the highest block in the blockchain stored by the user device ; Search the synchronization data packet corresponding to the block synchronization request packet in the content storage library, the synchronization data packet includes the block that has not been updated by the user equipment; when the block is found in the content storage library When the synchronization data packet corresponding to the synchronization request packet is returned, the synchronization data packet is returned to the user equipment; when the synchronization data packet corresponding to the block synchronization request packet is not found in the content storage library, in the Find the entry corresponding to the block synchronization request packet in the pending interest table of the network node; when the entry corresponding to the block synchronization request packet is not found in the pending interest table of the network node, add corresponding entry, and query the interface corresponding to the block synchronization request packet in the forwarding information table, and forward the block synchronization request packet through the determined interface; when the pending interest table of the network node finds the When the entry corresponding to the block synchronization request packet is found, an interface for receiving the block synchronization request packet is added to the found entry; when the synchronization data packet corresponding to the block synchronization request packet is received, according to the pending An entry in the interest table forwards the synchronization packet.

The embodiment of the present invention performs block synchronization based on the named data network. Due to its blockchain architecture based on the named data network, there is no need to set up super nodes, which avoids the problems caused by setting up super nodes; at the same time, in the named data network In the forwarding process, the block synchronization request packet can be forwarded to multiple other user devices at the same time, and the user device with the closest distance will return the corresponding data packet first, thereby realizing the nearest download of the block; in addition, the network When a node receives a block synchronization request packet, it can search its own content repository and provide the corresponding data packet to the user device. Using the content repository of the network node to realize data multiplexing reduces the amount of data transmission and Transmission delay.

In an implementation manner of the embodiment of the present invention, the method further includes: receiving a block search request packet sent by the user equipment, the name of the block search request packet includes a named data network protocol identifier, an application identifier, a request packet Type and block identifier, the block identifier is used to indicate the height of the previous block of the block searched by the user equipment; search the search data packet corresponding to the block search request packet in the content storage library, the The search data packet includes the block searched by the user equipment; when the search data packet corresponding to the block search request packet is found in the content storage library, the search data packet is returned to the user equipment; When the search data packet corresponding to the block search request packet is not found in the content storage library, look up the entry corresponding to the block search request packet in the pending interest table of the network node; when the When the entry corresponding to the block search request packet is not found in the pending interest table of the network node, add the corresponding entry in the pending interest table, and query the interface corresponding to the block search request packet in the forwarding information table , forward the block search request packet through the determined interface; when the entry corresponding to the block search request packet is found in the pending interest table of the network node, add the block search request packet to the found entry An interface for a block search request packet; when receiving a search data packet corresponding to the block search request packet, forwarding the search data packet according to entries in the pending interest table.

In this implementation, when the network node receives the block search request packet, it can search its own content storage library, and provide the corresponding data packet to the user equipment, and use the content storage library of the network node to realize data multiplexing , reducing the amount of data transmission and transmission delay.

In another implementation manner of the embodiment of the present invention, the method further includes: when the interface corresponding to the block search request packet is not found in the forwarding information table, storing the block search request packet; when the forwarding information table of the network node is updated, and the updated forwarding information table includes an entry corresponding to the block search request packet, query the forwarding information table related to the block search request An interface corresponding to the packet; forwarding the block search request packet through the determined interface.

In this implementation, when the user equipment is searching for a new block, usually the block has not been generated in the system, so it must wait for a user in the system to generate the block and broadcast the block information, and then according to the block The forwarding of the block search request packet and the return of the search data packet can only be realized after the information updates the forwarding information table.

In a third aspect, an embodiment of the present invention provides a block chain synchronization device based on a named data network, and the device includes units for implementing the method described in the first aspect, such as a sending unit and a receiving unit.

In a fourth aspect, an embodiment of the present invention provides a block chain synchronization device based on a named data network, the device includes units for implementing the method described in the second aspect, such as a receiving unit, a search unit, a processing unit and sending unit.

In the fifth aspect, the embodiment of the present invention also provides a block chain synchronization device based on a named data network, the device includes: a memory, a processor connected to the memory, a transceiver, and the memory is used to store software programs and A module, when the processor is used to run or execute the software programs and modules stored in the memory, it can execute the method described in any implementation manner of the first aspect.

In the sixth aspect, the embodiment of the present invention also provides a block chain synchronization device based on a named data network, the device includes: a memory, a processor connected to the memory, a transceiver, and the memory is used to store software programs and A module, when the processor is used to run or execute the software programs and modules stored in the memory, it can execute the method described in any implementation manner of the second aspect.

In the seventh aspect, the embodiment of the present invention also provides a computer-readable storage medium, where at least one instruction is stored in the storage medium, and the instruction is loaded and executed by a processor to implement the method described in any implementation manner of the first aspect. The blockchain synchronization method based on the named data network described above.

In an eighth aspect, an embodiment of the present invention further provides a computer-readable storage medium, where at least one instruction is stored in the storage medium, and the instruction is loaded and executed by a processor to implement the method described in any implementation manner of the second aspect. The blockchain synchronization method based on the named data network described above.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

FIG. 1 is a schematic diagram of a network architecture of an NDN provided by an embodiment of the present invention;

FIG. 2A is a hardware structural diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention;

FIG. 2B is a hardware structural diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention;

FIG. 3 is a flow chart of an NDN-based block chain synchronization method provided by an embodiment of the present invention;

FIG. 3A is an application scenario diagram of an NDN-based blockchain synchronization method provided by an embodiment of the present invention;

FIG. 3B is an application scenario diagram of an NDN-based blockchain synchronization method provided by an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention;

Fig. 5 is a schematic structural diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention.

Detailed ways

The "module" mentioned in this article refers to the program or instruction that can realize certain functions stored in the memory; the "unit" mentioned in this article refers to a functional structure divided according to logic, and the "unit" can be composed of Pure hardware implementation, or a combination of software and hardware.

In order to solve the problems existing in the existing blockchain scheme based on TCP/IP architecture, the embodiment of the present invention provides an NDN-based blockchain implementation scheme, which specifically includes an NDN-based blockchain synchronization method and an NDN-based Blockchain synchronization device. For ease of understanding, a brief introduction to NDN is given below.

Fig. 1 shows an NDN network architecture provided by an embodiment of the present invention. As shown in FIG. 1 , the NDN 100 includes multiple network nodes 101 (including network nodes A-E), and a user equipment 102 is connected to the network nodes 101. The user equipment 102 is both a producer and a consumer in the NDN. Among them, the consumer is the data requester that sends the Interest packet, and the producer is the data provider with the Data packet.

The user equipment 102 is a terminal equipment, and specifically may be a computer, a server, a mobile terminal, and the like.

The network node 101 in the NDN stores three data structures: Forwarding Information Base (FIB), Pending Interest Table (PIT) and Content Store (Content Store, CS).

Specifically, CS is used to store data packets passing through the network node, and its storage mode is the name of the data packet + data, as shown in the following table:

name data ndn/<App Name>/sync/<Blockchain State> ...

PIT is mainly used to store the name of the received Interest packet and the interface that receives the Interest packet. The storage mode is the name of the Interest packet + interface list, as shown in the following table:

name interface list ndn/<App Name>/sync/<Blockchain State> 0,1

FIB is mainly used for routing and forwarding, and is used to store forwarding interfaces corresponding to different names. Its storage mode is name (or prefix) + interface list, as shown in the following table:

name interface list ndn/<App Name>/sync/<Blockchain State> 2

When the Interest packet sent by the consumer passes through a certain network node 101, the network node 101 searches the CS for the data packet requested by the Interest packet, and if the data packet requested by the Interest packet exists in the CS, then returns the data packet to the consumer ; If the data packet does not exist in the CS, query whether there is an entry corresponding to the Interest packet in the PIT. If there is an entry corresponding to the Interest packet in the PIT, add the interface that receives the Interest packet to the entry; if there is no entry corresponding to the Interest packet in the PIT, add an entry corresponding to the Interest packet in the PIT, The entry includes the interface that receives the Interest packet, and the network node 101 matches the name of the Interest packet in the FIB, and selects an interface to forward the Interest packet.

If there is a data packet requested by the Interest packet in the CS of another network node 101 during the forwarding process, the other network node 101 returns the data packet according to the forwarding path of the Interest packet. If the data packet requested by the Interest packet does not exist in the CS of each network node 101 during the forwarding process, the Interest packet will be sent to the producer of the data packet, and the producer will return the data packet to the consumer. In the process of returning the data packet, if the network node 101 receives the data packet requested by the Interest packet, the network node 101 selects the interface to send the data packet according to the entry corresponding to the Interest packet in the PIT, thereby realizing sending the data packet to the request The consumer of this packet. Wherein, when forwarding the Interest packet, the network node 101 adopts the longest prefix matching mechanism to determine the forwarding interface.

The block synchronization solution provided by the embodiment of the present invention is implemented based on the above-mentioned NDN network architecture, and details are described in the detailed embodiments described later.

The implementation of the NDN-based block chain synchronization device provided by the embodiment of the present invention will be described below in conjunction with a specific hardware structure.

FIG. 2A shows a hardware structure for implementing an NDN-based block chain synchronization device provided by an embodiment of the present invention. The NDN-based block chain synchronization device may be a user equipment in the aforementioned network. As shown in FIG. 2A , the NDN-based block chain synchronization device 120 includes: a processor 11 , a transceiver 12 , and a memory 13 .

The processor 11 includes one or more processing cores, and the processor 11 executes various functional applications and information processing by running software programs and modules.

The transceiver 12, the memory 13, and the processor 11 are coupled through a bus. The memory 13 can be used to store software programs as well as modules. The memory may store an operating system 14, an application program module 15 for at least one function. The application module 15 at least includes: a sending module 151 and a receiving module 152 .

Optionally, the processor 11 is configured to execute each module in the application program module 15 to implement the steps required by the user equipment as shown in FIG. 3 .

In addition, the memory 13 is a computer-readable storage medium, which can be implemented by any type of volatile or non-volatile storage devices or their combination, such as static anytime access memory (SRAM), electrically erasable and programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

Those skilled in the art can understand that the structure of the NDN-based block chain synchronization device 120 shown in FIG. 2A does not constitute a limitation on terminal equipment, and may include more or less components than those shown in the illustration or combine some components, or different component arrangements.

FIG. 2B shows a hardware structure for implementing an NDN-based block chain synchronization device provided by an embodiment of the present invention. The NDN-based block chain synchronization device may be a network node in the aforementioned network. As shown in FIG. 2B , the NDN-based block chain synchronization device 220 includes: a processor 21 , a communication interface 22 , and a memory 23 .

The processor 21 includes one or more processing cores, and the processor 21 executes various functional applications and information processing by running software programs and modules.

The communication interface 22, the memory 23 and the processor 21 are coupled through a bus. The memory 23 can be used to store software programs as well as modules. The memory can store an operating system 24, an application program module 25 for at least one function. The application module 25 at least includes: a receiving module 251 , a searching module 252 , a processing module 253 and a sending module 254 .

Optionally, the processor 21 is configured to execute each module in the application program module 25 to implement the steps required by the network node as shown in FIG. 3 .

In addition, the memory 23 is a computer-readable storage medium, which can be implemented by any type of volatile or non-volatile storage devices or their combination, such as static anytime access memory (SRAM), electrically erasable and programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic or Optical Disk.

Those skilled in the art can understand that the structure of the NDN-based block chain synchronization device 220 shown in FIG. 2B does not constitute a limitation on terminal equipment, and may include more or less components than those shown in the illustration or combine some components, or different component arrangements.

Fig. 3 is an interaction diagram of an NDN-based block chain synchronization method provided by an embodiment of the present invention. As shown in Fig. 3, the block chain synchronization method is executed by the user equipment and the network node in Fig. 1, and the method includes :

S301: The first user equipment sends a block synchronization request packet to the network node.

Wherein, the block synchronization request packet adopts the format of interest packet, and is used for block synchronization. The name of the block synchronization request package adopts a hierarchical variable-length identifier as the naming rule. The name of the block synchronization request package can specifically include the NDN protocol identification, application identification, request package type and blockchain status Information, the status information of the blockchain is used to indicate the height of the highest block in the blockchain stored by the user equipment.

Specifically, the name of the block synchronization request package can be as follows: ndn/<App Name>/sync/<BlockchainState>. Among them, ndn/ is the NDN protocol identifier; <App Name> is the application identifier, for example, the <App Name> can be specifically blockndn; sync is the type of request packet, which is used to indicate that the request packet is a block synchronization request packet; <BlockchainState > is the status information of the blockchain, carrying the status information of the blockchain stored by the first user equipment, specifically, it can be the message summary of the block with the highest height in the blockchain stored by the first user equipment, for example, the first user The hash value of the block with the highest height in the blockchain stored on the device. The format of the hash value is as follows: "000000000000038cc0f7...".

Among them, the blockchain system uses the height to indicate the scale of the blockchain. The block with a height of 0 is the first block of the blockchain, and so on. Name each block, and the latest received block is the block with the highest height.

Further, before step S301, the method also includes:

Generate a block synchronization request packet.

Specifically, the process of generating the block synchronization request packet is as follows: the first user equipment determines the block with the highest height in the stored blockchain, and calculates its hash value; generates the block synchronization request packet according to the hash value.

It should be noted that after the first user equipment newly accesses the blockchain system, the local blockchain needs to be updated, and at this time the first user equipment sends a synchronization request packet to the network node.

S302: The network node receives the block synchronization request packet, and searches the CS for a synchronization data packet corresponding to the block synchronization request packet. If the synchronization data packet corresponding to the block synchronization request packet is found in the CS, execute step S303; if the synchronization data packet corresponding to the block synchronization request packet is not found in the CS, execute step S304.

Since the CS of the network node will store data packets, if other user equipments have previously performed block synchronization in the same blockchain state as the first user equipment, the network node may store a block synchronization request packet The corresponding synchronization data packet, at this time, the network node may directly send the corresponding synchronization data packet back to the first user equipment. For example, user equipment A has requested block synchronization before step S301 and obtained synchronization data packet A, which is stored in the network node, and the block chain height when user equipment A requests block synchronization is 40 , if the block chain height when the first user equipment requests synchronization in step S301 is also 40, then the network node storing the synchronization data packet A can return the synchronization data packet A to the first user equipment.

S303: The network node returns the synchronization data packet to the first user equipment.

Specifically, the network node finds and receives the block synchronization request packet in the CS, and returns it to the first user equipment according to the interface for receiving the block synchronization request packet.

S304: The network node searches the PIT of the network node for an entry corresponding to the block synchronization request packet; when the entry corresponding to the block synchronization request packet is not found in the PIT of the network node, add the corresponding entry in the PIT, and perform the steps S305: When an entry corresponding to the block synchronization request packet is found in the PIT of the network node, add an interface for receiving the block synchronization request packet to the found entry.

In this step, if the network node does not find the entry corresponding to the block synchronization request packet in the PIT table, it means that no network node has forwarded the same block synchronization request packet before. The entry corresponding to the block synchronization request packet is added to the table. The entry includes the name of the block synchronization request package and the interface for receiving the block synchronization request package.

If the network node finds the entry corresponding to the block synchronization request packet in the PIT table, it means that the network node has forwarded the same block synchronization request packet before, and the network node only needs to add The block synchronization request packet is received on the interface, so that when the corresponding synchronization data packet is subsequently received, it can be forwarded to the first user equipment through the entry in the PIT table.

S305: The network node queries the interface corresponding to the block synchronization request packet in the FIB table, and forwards the block synchronization request packet through the determined interface.

Specifically, the network node matches the name of the block synchronization request packet in the FIB table to determine the corresponding forwarding interface; then uses the determined forwarding interface to forward the block synchronization request packet. Wherein, the format of the FIB table is as described above, and the matching can be implemented by using the longest matching rule.

The network node queries the interface corresponding to the block synchronization request packet in the FIB table, and if the interface corresponding to the block synchronization request packet is found, the block synchronization request packet is forwarded through the determined interface. If the interface corresponding to the block synchronization request packet is not found, the block synchronization request packet is stored until the FIB is updated and re-matched to determine the corresponding forwarding interface.

In the FIB, there may be multiple forwarding interfaces for the entry matched by the name of the block synchronization request packet. Therefore, the network node may use multiple forwarding interfaces to forward the block synchronization request packet at the same time, thereby making the block synchronization Request packets can be forwarded to different user devices.

Since there are multiple network nodes in the NDN network, in the process of forwarding the block synchronization request packet, each network node that receives the block synchronization request packet performs steps S302-S305.

S306: The second user equipment receives the block synchronization request packet, and returns a synchronization data packet.

Specifically, after receiving the block synchronization request packet, the second user equipment determines the block that the first user equipment needs to synchronize according to the state information of the block chain in the block synchronization request packet; Blocks that need to be synchronized generate a synchronization data packet and return it to the first user equipment.

Wherein, according to the state information of the block chain in the block synchronization request packet, the process of determining the block to be synchronized by the first user equipment is as follows: State information; determine the height of the block with the highest height in the block chain stored by the first user equipment according to the state information of the block chain; compare the determined height of the block with the highest height in the block chain stored by the first user equipment The height and the height of the block with the highest height in the block chain stored by the second user equipment determine the block that needs to be synchronized by the first user equipment.

For example, the block with the highest height in the block chain stored by the first user equipment determined according to the block synchronization request packet is the 40th block, and the block with the highest height in the blockchain stored by the second user equipment is the 40th block. 80 blocks, the blocks to be synchronized by the first user equipment are blocks 41-80.

Wherein, the block with the highest height in the block chain stored by the first user equipment is determined according to the state information of the block chain, specifically according to the hash value of the block with the highest height in the block chain stored by the first user equipment, The process of determining the corresponding block will not be repeated here.

If the height of the block with the highest height in the block chain stored by the second user device is less than or equal to the height of the block with the highest height in the block chain stored by the first user device, it means that the second user device cannot be the first user The device provides blocks, and at this time, the second user equipment does not return a synchronization data packet to the first user equipment.

S307: The network node receives the synchronization data packet, and sends the synchronization data packet to the first user equipment.

Specifically, the network node searches for an interface that receives the block synchronization request packet corresponding to the synchronization data packet according to the entry in the PIT table; forwards the synchronization data packet through the found interface.

After the forwarding is completed, the corresponding entry is deleted from the PIT table, so as to avoid repeatedly sending the synchronization data packet to the first user equipment.

Based on this forwarding mechanism, when the first user equipment requests a synchronization data packet, it can usually obtain the synchronization data packet returned by the nearest user equipment. , so the transmission distances of the block synchronization request packet and the synchronization data packet are different, resulting in different time required to return the synchronization data packet. The user equipment closest to the first user equipment returns the synchronization data packet first, and the network forwarding the synchronization data packet After forwarding, the node will delete the corresponding entry in the PIT table, and subsequent synchronization data packets returned by other user equipment will not be forwarded to the first user equipment.

Taking the network shown in FIG. 3A as an example, Alice, Bob, Charles and Dave are four user equipments in the network. Alice and Charles have updated the latest block of the whole network, and the block height has reached 80. Both user devices support the synchronization service. Bob and Dave currently have block heights of 40 and 0. The length of the black line represents the actual distance between the two nodes. Bob and Dave respectively send a synchronization request packet with the current highest block hash value to the NDN network. Due to the different physical distance, Alice responds to Bob's request. Specifically, Alice extracts Bob's block according to the name of the synchronization request packet The status information of the chain is compared with its own blockchain, and it is found that it lacks all blocks from height 41 to height 80, so Alice packs these blocks into a synchronization data packet and returns it to Bob. Similarly, Charles also sends blocks 1 to 80 to Dave. Thus, Bob and Dave complete block synchronization.

Since there are multiple network nodes in the NDN network, in the process of forwarding the synchronization data packet, each network node that receives the synchronization data packet executes in the manner of step S307.

S308: The first user equipment receives the synchronization data packet, and extracts blocks in the synchronization data packet and stores them in the blockchain database.

Specifically, the first user equipment extracts the blocks in the synchronization data packet, and then verifies the legitimacy of the extracted blocks, if the legitimacy of these blocks is verified, it is stored in the block chain database, if not The rules are discarded directly.

The first user equipment repeatedly executes steps S301 and 308, and if no synchronization data packet is received within a set time after step S301, it means that the first user equipment has synchronized all blocks, and then executes step S309.

S309: The first user equipment sends a block search request packet to the network node.

Among them, the block search request packet adopts the format of the interest packet and is used for block search. The name of the block search request package adopts a hierarchical variable-length identifier as the naming rule. The name of the block search request package can specifically include NDN protocol identification, application identification, request package type and block identification. The block identifier is used to indicate the height of the previous block of the block searched by the user equipment, and the height of the previous block of the block searched by the user equipment is the height of the block with the highest height in the block chain stored by the user equipment. For example, if the block to be searched by the block search request packet is the 40th block, then the block identifier corresponds to the 39th block.

Specifically, the name of the block search request package can be as follows: ndn/<App Name>/blocks/<Block’sDigest>. Among them, ndn/ is the NDN protocol identifier; <App Name> is the application identifier, for example, the <App Name> can be specifically blockndn; blocks is the type of request packet, which is used to indicate that the request packet is a block search request packet, < Block'sDigest> is a block identifier, which may specifically be the message digest of the block with the highest height in the blockchain stored by the first user device, for example, the hash of the highest block in the blockchain stored by the first user device Value, the format of the hash value is as follows "000000000000024b89b4...", the hash value is the hash value of the block with a height of 0, and the block search request packet with this hash value is used to search for a block with a height of 1.

Further, before step S309, the method also includes:

Generate a block search request packet.

Specifically, the process of generating the block search request packet is as follows: the first user equipment determines the block to be searched, and calculates its hash value; generates the block search request packet according to the hash value.

Usually, the block searched by the user equipment is the latest block, such as the block search referred to in the subsequent steps S310-S314. Of course, the block search request packet can also be used to search the existing blocks of the user equipment, so that the correctness of the existing blocks can be judged. At this time, the sending of the block search request packet and the reception of the search data packet The process can refer to the previous block synchronization process.

S310: The network node receives the block search request packet, and searches the CS for a search data packet corresponding to the block search request packet. If the search data packet corresponding to the block search request packet is found in the CS, execute step S311; if the search data packet corresponding to the block search request packet is not found in the CS, execute step S312.

For the detailed process of step S310, reference may be made to step S302.

S311: The network node returns the search data packet to the first user equipment.

Because usually when the first user equipment sends the search request packet, there is no new block (a block with a higher height than any block in the block chain of the first user) in the network, so the network node Usually no corresponding search data packets are stored either.

S312: the network node searches the PIT of the network node for the entry corresponding to the block search request packet; when the entry corresponding to the block search request packet is not found in the PIT of the network node, add the corresponding entry in the PIT, and perform the step S313: When an entry corresponding to the block search request packet is found in the PIT of the network node, add an interface for receiving the block search request packet to the found entry.

For the detailed process of step S312, reference may be made to step S304.

S313: The network node queries the interface corresponding to the block search request packet in the FIB table, if the interface corresponding to the block search request packet is found, forwards the block search request packet through the determined interface, and then jumps to step S317. If the interface corresponding to the block search request packet is not found, the block search request packet is stored.

For the detailed process of step S313, reference may be made to step S305.

S314: The third user equipment creates a new block.

Specifically, each user device in the blockchain is a miner, that is, a block producer, so each user device will send a block search request packet after updating, or may send a block search request packet at the same time Generate new blocks.

It should be noted that the third user equipment here may be the same user equipment as the second user equipment, or may be different user equipment. The third user equipment here may be the same user equipment as the first user equipment. If the third user equipment is the same user equipment as the first user equipment, the search request packet will not be returned to the first user equipment in the subsequent process.

Further, the method may further include: adding the newly created block to the local blockchain by the third user equipment.

S315: The network node updates the FIB table, and adds an entry corresponding to the new block.

After the third user equipment creates a new block, the network node belonging to the same local area network as the third user equipment updates its own FIB entry according to the local area network interaction information. Specifically, an entry corresponding to the new block is added in the FIB table.

The network nodes synchronize their respective FIB tables according to a Name-data Link State Routing Protocol (NLSR). That is to say, the FIB table of each network node in NDN will finally update the entry of the new block.

The entry corresponding to the new block includes the name of the search data packet corresponding to the block and the corresponding forwarding interface. The name of the search data packet corresponding to the block may be the same as the name of the block search request packet used to search the block. Therefore, this entry is also the entry corresponding to the block search request packet.

S316: The network node determines the interface corresponding to the block search request packet according to the updated FIB, and forwards the block search request packet through the determined interface.

Since the purpose of the block search request packet is to search for newly created blocks, and the updated FIB just updates the routing entries of the newly created block, so at this time the network node must be able to determine the interface corresponding to the block search request packet .

For the detailed process of step S316, reference may be made to step S305.

S317: The third user equipment generates a search data packet corresponding to the block search request packet, and returns the search data packet.

Specifically, the third user equipment receives the block search request packet, first judges whether the search data packet requested by the block search request packet can be provided, and if it can be provided, generates and returns the search data corresponding to the block search request packet Bag.

For example, after receiving the block search request packet, the third user equipment determines the block searched by the first user equipment according to the block identifier in the block search request packet; The height of the blockchain determines whether the block searched by the first user equipment can be provided; if the block searched by the first user equipment can be provided, a search data packet is generated according to the block searched by the first user equipment and returned to the first user equipment. the user equipment; otherwise, the search data packet is not returned to the first user equipment. Specifically, if the height of the block with the highest height in the block chain stored by the third user equipment is less than or equal to the height of the block corresponding to the block identifier, it means that the third user equipment cannot provide the block for the first user equipment.

For example, the block searched by the first user equipment determined by the third user equipment according to the block search request packet is the 81st block, and the third user equipment has the 81st block, then the third user equipment sends the first user equipment Return the corresponding search data packet.

It is worth noting that since the third user equipment here is a user equipment that has created a new block, at this time the third user equipment must be able to provide the new block searched by the first user equipment.

Since each user device in the blockchain system will send a block search request packet, in the process of returning the block search data packet, it will be returned to each user device in the blockchain system, which is equivalent to broadcasting in the network the block.

S318: The network node receives the search data packet, and sends the search data packet to the first user equipment.

Specifically, details of step S318 may refer to step S307.

S319: The first user equipment receives the search data packet, and extracts blocks in the search data packet and stores them in the blockchain database.

Specifically, the first user equipment extracts the blocks in the search data packet, and then verifies the legitimacy of the extracted blocks, if the legitimacy of these blocks is verified, it is stored in the block chain database, if not The rules are discarded directly.

In order to save the latest state of the blockchain, the first user equipment needs to repeatedly send block search request packets. Specifically, when the first user equipment receives the search data packet returned by the network node, it extracts the blocks in the search data packet and stores them in the blockchain database, and then sends a new block search request packet, the new block search request The block identifier of the packet is different from the block identifier of the block search request packet; when the search data packet returned by the network node is not received within a predetermined time, the block search request packet is resent. The predetermined time here may be the same as or different from the aforementioned set time.

What needs to be explained here is that although the network node will record it in the PIT table after receiving the block search request packet, it will return it to the corresponding user equipment after obtaining the corresponding search data packet. However, since the network node may regularly or periodically clear the PIT entry, if the first user equipment does not receive the search data packet returned by the network node within a predetermined time, it can avoid The search data packet is not received because the network node clears the PIT entry.

As shown in Figure 3B, Ailce, Bob, and Ted are three user devices in the network, all of which store all the current 80 blocks of the entire network, and all send block search request packets to request the 81st block at the same time block, the block search request packet message is recorded in the PIT table of the network node (such as a router), taking network node C as an example, the interface corresponding to the block search request packet of the 81st block in the PIT entry is 0, 1 ,2. At this time, Ted as a miner generates a new block with a height of 81. Ted first broadcasts the block information of the block to the network nodes in the network, and the network nodes update the FIB according to the block information, and then transfer the block The block search request packet is forwarded to Ted, and Ted returns a search data packet to the network according to the received block search request packet, thereby realizing the broadcast of the block. Network node C will forward the data along interfaces 1 and 2 according to the record of the PIT entry, and finally deliver it to Alice and Bob.

The NDN-based block chain synchronization method provided by the embodiment of the present invention has the following advantages: First, when the user equipment performs block broadcast, it is simpler than the block chain implementation under the existing TCP/IP architecture, The reason is as follows: In order to ensure that network nodes will not repeatedly accept blocks that have been acquired under the TCP/IP architecture, network nodes do not directly send blocks, but the provider (block provider) first sends an inv message to Neighbor, inform the other party which block information is available for download. After the neighbor node receives the inv message, it sends a getdata message according to the inv message (the hash value of the block) to inform the provider which blocks it needs, and then the provider returns The blocks message allows neighboring user equipment to download block data; and the embodiment of the present invention simplifies the above steps by virtue of the "consumer-driven" feature of the NDN network architecture itself, and completes the broadcast without the need for the inv message. Likewise, broadcast under NDN is not as complicated as under TCP/IP network architecture. Second, to make the blockchain system truly decentralized, there are no super nodes in the system. This provides a strong guarantee for the fairness of the system. Third, the blockchain system is based on the NDN network. Whether it is the synchronization of browsing online user devices or the implementation of functions such as search, the process does not need to pay attention to location information such as IP addresses and ports. This feature greatly reduces the pressure of web application development work.

Fig. 4 shows a block diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention. The NDN-based block chain synchronization device can be implemented as all or part of the user equipment through a dedicated hardware circuit, or a combination of software and hardware. The NDN-based blockchain synchronization device includes a sending unit 401 and a receiving unit 402 . Wherein, the sending unit 401 is used to send a block synchronization request packet to the network node. The name of the block synchronization request packet includes the NDN protocol identifier, the application identifier, the request packet type, and the state information of the block chain. The state information of the block chain is used for To indicate the height of the block with the highest height in the block chain stored by the user equipment; the receiving unit 402 is used to receive the synchronization data packet returned by the network node, and extract the block in the synchronization data packet and store it in the block chain database.

Relevant details may be combined with reference to the method embodiment in FIG. 3 .

It should be noted that the above-mentioned sending unit 401 and receiving unit 402 may be implemented by a transceiver, or implemented by a processor in cooperation with a transceiver.

Fig. 5 shows a block diagram of an NDN-based block chain synchronization device provided by an embodiment of the present invention. The NDN-based block chain synchronization device can be implemented as all or part of the network nodes through a dedicated hardware circuit, or a combination of software and hardware. The device includes a receiving unit 501 , a searching unit 502 , a processing unit 503 and a sending unit 504 . Wherein, the receiving unit 501 is used for the network node to receive the block synchronization request packet sent by the user equipment. The name of the block synchronization request packet includes the NDN protocol identifier, the application identifier, the request packet type, and the status information of the block chain. The status information is used to indicate the height of the block with the highest height in the block chain stored by the user equipment; the search unit 502 is used to search for the entry corresponding to the block synchronization request packet in the PIT of the network node; the processing unit 503 is used to when the network node When the entry corresponding to the block synchronization request packet is not found in the PIT of the network node, add the corresponding entry in the PIT, and query the interface corresponding to the block synchronization request packet in the FIB table; when the block is found in the PIT of the network node When synchronizing the entry corresponding to the request packet, add an interface for receiving the block synchronization request packet to the found entry; the sending unit 504 is used to forward the block synchronization request packet through the determined interface; the sending unit 504 is also used to receive the block synchronization request packet when receiving When the search data packet corresponding to the block synchronization request packet is forwarded, the search data packet is forwarded according to the entries in the PIT.

Relevant details may be combined with reference to the method embodiment in FIG. 3 .

It should be noted that the above search unit 502 and the processing unit 503 can be implemented by a processor or the processor executes program instructions in the memory, and the above receiving unit 501 and sending unit 504 can be implemented by a communication interface, or the processor cooperates with the communication interface to achieve.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (16)

1. a kind of block chain synchronous method based on name data network, which is characterized in that the described method includes:

User equipment sends block synchronization request packet to network node, and the title of the block synchronization request packet includes name data Network protocol mark, application identities, the status information for requesting Packet type and block chain, the status information of the block chain is for referring to Show the height of the highest block of height in the block chain of the user equipment storage；

The synchronization packets that the network node returns are received, and extract the storage of the block in the synchronization packets to block chain Database.

2. being asked the method according to claim 1, wherein the user equipment is synchronized to network node transmission block Seek packet, comprising:

It determines the highest block of height in the block chain of storage, and calculates its cryptographic Hash；Height in the block chain is highest Status information of the cryptographic Hash of block as the block chain, generates the block synchronization request packet；The block is synchronized and is asked Packet is asked to be sent to the network node.

3. method according to claim 1 or 2, which is characterized in that the method also includes:

When the synchronization packets are not received in the setting time after user equipment sends the synchronization request packet When, Xiang Suoshu network node sends block search request packet, and the title of the block search request packet includes name data network Protocol-identifier, application identities, request Packet type and block-identified, it is described block-identified to be used to indicate the user equipment searches The height of a upper block for block, the height of a upper block for the block of the user equipment searches are user equipment storage Block chain in the highest block of height height；

When receiving the search data packet that the network node returns, the block extracted in described search data packet is stored to area Block chain database, then sends new block search request packet, the new block search request packet it is block-identified with it is described The block-identified difference of block search request packet；When the search data for not receiving the network node return in the given time Bao Shi retransmits the block search request packet.

4. method according to claim 1 or 2, which is characterized in that the method also includes:

Receive the block synchronization request packet that another user equipment that the network node is sent is sent；

The status information of the block chain in block synchronization request packet sent according to another user equipment, determines described another The height of the highest block of height in the block chain of user equipment storage；

Compare the height of the highest block of height and the user in the block chain for another user equipment storage determined The height of the highest block of height in the block chain of equipment storage determines that another user equipment needs synchronous block；

It needs synchronous block to generate synchronization packets according to another user equipment, and returns to another user and set It is standby.

5. method according to claim 1 or 2, which is characterized in that the method also includes:

When the user equipment successfully creates block, the network node into network broadcasts the information of the block；

The block search request packet that network node is sent is received, the block search request packet is for requesting the user equipment new The block of creation；

Searching request packet is sent to the network node, described search data packet includes the newly created block of the user equipment.

6. a kind of block chain synchronous method based on name data network, which is characterized in that the described method includes:

Network node receives the block synchronization request packet that user equipment is sent, and the title of the block synchronization request packet includes name The status information of data network protocol mark, application identities, the status information for requesting Packet type and block chain, the block chain is used The height of the highest block of height in the block chain for indicating the user equipment storage；

The corresponding synchronization packets of the block synchronization request packet are searched in content store, the synchronization packets include institute State the block that user equipment does not update；

When finding the corresponding synchronization packets of the block synchronization request packet in the content store, by the synchronization Data packet returns to the user equipment；It is corresponding same when not finding the block synchronization request packet in the content store When step data packet, the corresponding entry of the block synchronization request packet is searched in the interest table undetermined of the network node；

When not finding the corresponding entry of the block synchronization request packet in the interest table undetermined of the network node, undetermined Corresponding entry is added in interest table, and inquires interface corresponding with the block synchronization request packet in forwarding information table, is led to It crosses the interface determined and forwards the block synchronization request packet；When finding the area in the interest table undetermined of the network node When the corresponding entry of block synchronization request packet, addition receives the interface of the block synchronization request packet in the entry found；

When receiving the corresponding synchronization packets of the block synchronization request packet, turned according to the entry in the interest table undetermined Send out synchronization packets described.

7. according to the method described in claim 6, it is characterized in that, the method also includes:

The block search request packet that the user equipment is sent is received, the title of the block search request packet includes name data Network protocol mark, application identities, request Packet type and block-identified, it is described block-identified to be used to indicate the user equipment and search The height of a upper block for the block of rope；

The corresponding search data packet of the block search request packet is searched in content store, described search data packet includes institute State the block of user equipment searches；

When finding the corresponding search data packet of the block search request packet in the content store, by described search Data packet returns to the user equipment；When not finding in the content store, the block search request packet is corresponding to be searched When rope data packet, the corresponding entry of the block search request packet is searched in the interest table undetermined of the network node；

When not finding the corresponding entry of the block search request packet in the interest table undetermined of the network node, undetermined Corresponding entry is added in interest table, and inquires interface corresponding with the block search request packet in forwarding information table, is led to It crosses the interface determined and forwards the block search request packet；When finding the area in the interest table undetermined of the network node When the corresponding entry of block search request packet, addition receives the interface of the block search request packet in the entry found；

When receiving the corresponding search data packet of the block search request packet, turned according to the entry in the interest table undetermined Send out described search data packet.

8. the method according to the description of claim 7 is characterized in that the method also includes:

When not inquiring interface corresponding with the block search request packet in the forwarding information table, the block is stored Searching request packet；

It when the forwarding information table of the network node is updated, and include the block in the updated forwarding information table When the corresponding entry of searching request packet, interface corresponding with the block search request packet is inquired in forwarding information table；

The block search request packet is forwarded by the interface determined.

9. a kind of block chain synchronizing device based on name data network, which is characterized in that described device includes:

Transmission unit, for sending block synchronization request packet to network node, the title of the block synchronization request packet includes life Name data network protocol mark, application identities, the status information for requesting Packet type and block chain, the status information of the block chain It is used to indicate the height of the highest block of height in the block chain of user equipment storage；

Receiving unit, the synchronization packets returned for receiving the network node, and extract the area in the synchronization packets Block is stored to block chain database.

10. device according to claim 9, which is characterized in that described device further include:

Processing unit for determining the highest block of height in the block chain stored, and calculates its cryptographic Hash；By the block chain Status information of the cryptographic Hash of the middle highest block of height as the block chain, generates the block synchronization request packet.

11. device according to claim 9 or 10, which is characterized in that the transmission unit is also used to when in the user Equipment is sent when not receiving the synchronization packets in the setting time after the synchronization request packet, Xiang Suoshu network node Send block search request packet, the title of the block search request packet include name data network protocol mark, application identities, Request Packet type and block-identified, the height of a upper block for the block-identified block for being used to indicate the user equipment searches Degree, the height of a upper block for the block of the user equipment searches are height highest in the block chain of user equipment storage Block height；

The receiving unit is also used to extract described search number when receiving the search data packet that the network node returns According to the block storage in packet to block chain database；

The transmission unit is also used to after receiving the search data packet that the network node returns, sends new block and search Rope request packet, the block-identified difference of the block-identified and block search request packet of the new block search request packet； When not receiving the search data packet that the network node returns in the given time, the block search request is retransmitted Packet.

12. device according to claim 10, which is characterized in that the receiving unit is also used to receive the network section The block synchronization request packet that another user equipment that point is sent is sent；

The processing unit, the shape for the block chain in block synchronization request packet for being also used to be sent according to another user equipment State information determines the height of the highest block of height in the block chain of another user equipment storage；Compare the institute determined It states in the block chain of another user equipment storage in the height of the highest block of height and the block chain of user equipment storage The height of highly highest block determines that another user equipment needs synchronous block；According to another user equipment Synchronous block is needed to generate synchronization packets；

The transmission unit is also used to returning to the synchronization packets into another user equipment.

13. device according to claim 9 or 10, which is characterized in that the transmission unit is also used to set as the user For when successfully creating block, the network node into network broadcasts the information of the block；

The receiving unit, is also used to receive the block search request packet of network node transmission, and the block search request packet is used In the request newly created block of user equipment；

The transmission unit is also used to send searching request packet to the network node, and described search data packet includes the use The newly created block of family equipment.

14. a kind of block chain synchronizing device based on name data network, which is characterized in that described device includes:

Receiving unit receives the block synchronization request packet that user equipment is sent, the block synchronization request packet for network node Title include name data network protocol mark, application identities, request Packet type and block chain status information, the block The status information of chain is used to indicate the height of the highest block of height in the block chain of the user equipment storage；

Searching unit, it is described same for searching the corresponding synchronization packets of the block synchronization request packet in content store Step data packet includes the block that the user equipment does not update；

Transmission unit finds the corresponding synchronization packets of the block synchronization request packet for working as in the content store When, the synchronization packets are returned into the user equipment；

The searching unit is also used to corresponding same when not finding the block synchronization request packet in the content store When step data packet, the corresponding entry of the block synchronization request packet is searched in the interest table undetermined of the network node；

Processing unit, for corresponding when not finding the block synchronization request packet in the interest table undetermined of the network node When entry, corresponding entry is added in interest table undetermined, and inquiry and the block synchronization request packet in forwarding information table Corresponding interface；When finding the corresponding entry of the block synchronization request packet in the interest table undetermined of the network node, Addition receives the interface of the block synchronization request packet in the entry found；

The transmission unit is also used to forward the block synchronization request packet by the interface determined；

The transmission unit is also used to when receiving the corresponding synchronization packets of the block synchronization request packet, according to described Entry in interest table undetermined forwards the synchronization packets.

15. device according to claim 14, which is characterized in that the receiving unit is also used to receive the user and sets The block search request packet that preparation is sent, the title of the block search request packet include name data network protocol mark, application Mark, request Packet type and block-identified, block-identified mono- area block Shang for being used to indicate the user equipment searches The height of block；

The searching unit is also used to search the corresponding search data packet of the block search request packet in content store, Described search data packet includes the block of the user equipment searches；

The searching unit is also used to that the corresponding search of the block search request packet ought be found in the content store When data packet, described search data packet is returned into the user equipment；

The processing unit, is also used to when not finding in the content store that the block search request packet is corresponding to search When rope data packet, the corresponding entry of the block search request packet is searched in the interest table undetermined of the network node；Work as institute It states when not finding the corresponding entry of the block search request packet in the interest table undetermined of network node, in interest table undetermined Corresponding entry is added, and inquires interface corresponding with the block search request packet in forwarding information table；When the network When finding the corresponding entry of the block search request packet in the interest table undetermined of node, adds and connect in the entry found Receive the interface of the block search request packet；

The transmission unit is also used to forward the block search request packet by the interface determined；

The transmission unit is also used to when receiving the corresponding search data packet of the block search request packet, according to described Entry in interest table undetermined forwards described search data packet.

16. device according to claim 15, which is characterized in that the processing unit is also used to believe when in the forwarding When not inquiring interface corresponding with the block search request packet in breath table, the block search request packet is stored；

The processing unit is also used to be updated when the forwarding information table of the network node, and the updated forwarding In information table when entry corresponding including the block search request packet, inquires in forwarding information table and asked with the block search Seek the corresponding interface of packet；

The transmission unit is also used to forward the block search request packet by the interface determined.