CN111581605B - Block chain-based multi-person participation BIM drawing copyright protection system and method - Google Patents
Block chain-based multi-person participation BIM drawing copyright protection system and method Download PDFInfo
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- G06F21/10—Protecting distributed programs or content, e.g. vending or licensing of copyrighted material ; Digital rights management [DRM]
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Abstract
The invention belongs to the technical field of network information security, and relates to a block chain-based multi-person participation BIM drawing copyright protection system and a method, wherein the protection system comprises a user operation module, a digital signature extraction and verification module, a BIM drawing modification and submission module, an intelligent contract module and a block chain storage module; on the other hand, the system also sets a copyright dividing function for BIM drawings completed by multi-person cooperation, the copyright attribution division is decided by negotiations of all designers, and the details of the BIM drawing creation process and the copyright division are recorded by adopting the characteristic that a block chain cannot be tampered, so that the fundamental interests of each creation contributor are ensured.
Description
Technical field:
the invention belongs to the technical field of network information security, and relates to a blockchain-based multi-person participation BIM drawing copyright protection system and method.
The background technology is as follows:
along with the wide use of BIM technology in building design, BIM drawing design is often multi-person collaborative creation, and multi-person collaborative creation BIM drawing leads to complicated and chaotic drawing version, so that designer contribution records are not clear, and finally the problem of no basis for copyright attribution division is caused; meanwhile, BIM drawing copyright relies on traditional website copyright to declare that dynamics is low, the supervision degree of difficulty is big, and difficult verification after the modification brings the creation again for BIM drawing designer and company, has failed to satisfy BIM drawing copyright protection's demand. Currently, some BIM model copyright protection methods, for example, CN201910513254.6 discloses a digital watermark method for BIM model copyright protection, which includes: watermark embedding and watermark extraction of model data, wherein watermark embedding comprises extracting multi-surface grid vertex coordinates from original BIM data, obtaining a high-order part of coordinate data, and establishing a corresponding relation between coordinate values and watermark bits by using a one-way mapping function; embedding the watermark into a part with lower significant bits in the coordinate data by using a QIM method; because the repetition value of the coordinate data in BIM data is more, the effective carrier for embedding the watermark is less, in order to solve the problem, before the watermark is embedded, random noise in the tolerance range is added to the original coordinate data, so as to embed different watermarks, and the watermark embedding capacity is indirectly increased; when the watermark is extracted, the participation of original data is not needed, and the method is a blind watermarking method; however, the method cannot provide perfect drawing modification accurate recording and copyright attribution dividing functions, and when multiple persons collaboratively create BIM drawings, the work contribution of a designer is ensured to have basis, and copyright division proves to be an important subject which is urgently needed to be solved in the industry.
The invention comprises the following steps:
the invention aims to overcome the defects of the prior art, designs and provides a system and a method for protecting the copyright of a multi-person participation BIM drawing based on a blockchain, solves the problem that the workload record of the multi-person collaborative creation BIM drawing is unclear, realizes the multi-person collaborative creation function of the BIM drawing by combining an asymmetric encryption technology with a blockchain technology, can accurately record the contribution of each designer in the blockchain by modifying a characteristic value, and accurately records the creation identification and copyright division of the BIM drawing by means of the non-falsifiability of the blockchain, thereby effectively solving the problem that the copyright of the BIM drawing belongs to the unknown state.
In order to achieve the above purpose, the main structure of the blockchain-based multi-person-participation BIM drawing copyright protection system comprises a user operation module, a digital signature extraction and verification module, a BIM drawing modification and submission module, an intelligent contract module and a blockchain storage module, wherein the user operation module is respectively in communication connection with the digital signature extraction and verification module and the BIM drawing modification and submission module, the user operation module is used for providing functions of user registration, BIM drawing information uploading and the like for users, the digital signature extraction and verification module is used for extracting and verifying user digital signatures, generating BIM drawing modification right setting records by calling drawing modification right setting contracts to complete modification right setting of BIM drawing, and storing the BIM drawing modification right setting records in a uplink manner; the BIM drawing modification submitting module is used for acquiring the latest version drawing information, submitting the modification version BIM drawing information and initiating drawing copyright division; the BIM drawing modification submitting module is respectively in communication connection with the intelligent contract module and the blockchain storage module, the digital signature submitting verifying module is respectively in communication connection with the intelligent contract module and the blockchain storage module, the intelligent contract module is used for providing intelligent contracts with corresponding functions for all modules, intelligent contract calling requests of all modules are processed, and the blockchain storage module is used for storing relevant information of BIM drawing copyrights.
The user registration refers to the fact that a new user submits user registration information comprising a user name, an identity card number and a user password, a system distributes a corresponding public-private key pair for the user by adopting an elliptic curve encryption algorithm according to the registration information, and the user password and the user name are bound to the public-private key pair, wherein public key disclosure is used for verifying private key signature, and private key confidentiality is used for signing and marking user ownership.
The BIM drawing information uploading refers to that a user uploads BIM drawing information to a node of a blockchain system for processing through a user operation module, wherein the BIM drawing information uploading comprises initial BIM drawing information uploading, modified BIM drawing information uploading and final BIM drawing information uploading, and related information of the initial BIM drawing and related information of the user are submitted to a digital signature extraction verification module through the user operation module before the initial BIM drawing information uploading; before the information of the BIM drawing of the modification version is uploaded, the related information of the BIM drawing of the modification version and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module to verify the modification right; before uploading the information of the final BIM drawing, the related information of the final BIM drawing and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module for modification right verification; wherein the related information of the user is a user name and a user password; the relevant information of the BIM drawing is file header information and all entity instance information in an IFC file, wherein the file header information in the IFC file comprises IFC version information, an application program for outputting the IFC file, file output time, user information of BIM model design software and enterprise information of a user; all entity instance information comprises a Global Unique Identifier (GUID), model creator information, model creation application software, creation time, modifier information, model modification application software, modification time and modification action information, an application program outputting an IFC file is an application program converting a BIM model into the IFC file, the Global Unique Identifier (GUID) is an international identifier for uniquely identifying the IFC file, the identifier corresponds to the IFC file one by one, and modification of the content of the IFC file does not cause modification of the global unique identifier; the model creator information means user information set when creating a model in the BIM model design software, and is set as information of all design participants, and the modification action information means a modification record of the BIM model by the designer.
After the initial version BIM drawing information is uploaded, a user private key is adopted to carry out private key signature on a global unique identifier in entity instance information, so as to obtain a digital signature for marking the user's right to modify the drawing, and the digital signature extraction is aimed at all designers; before the user modifies the BIM drawing, the user adopts a public key to carry out private key signature decryption verification according to the global unique identifier and the digital signature of the BIM drawing of the initial edition on the chain, judges whether the user has the modification right of the BIM drawing, and can acquire the BIM drawing of the latest edition if the verification is successful; after the user completes BIM drawing modification, the modified BIM drawing information is stored in a uplink mode, and meanwhile public key decryption digital signature verification is needed, and whether the user has modification rights is judged; the modification right setting of the BIM drawing aims at the initial version BIM drawing, and a digital signature is adopted to set which designer users can acquire and review the drawing and can store the information of the modification version BIM drawing in a linking way after the drawing is modified.
The method comprises the steps that when a BIM model is created cooperatively by multiple persons, a global unique identifier of a BIM drawing file is required to be obtained from a blockchain by calling a drawing content obtaining contract, the BIM drawing file of the latest version is obtained according to the identifier, and the obtaining condition of the global unique identifier is that private key signature verification is successful; submitting BIM drawing information of a modification version means that after a user modifies a BIM model through BIM model design software, a BIM drawing file is derived, a BIM drawing modification record is generated according to the latest BIM drawing information by calling a drawing content submitting contract and submitted to a blockchain network, and the drawing modification record information submitting condition is that digital signature verification is successful; the drawing copyright partitioning is to analyze user work contribution according to BIM drawing modification right setting records, BIM drawing modification records and user copyright partitioning protocols on a chain, partition the copyright of the drawing, and the copyright partitioning result requires that all designers adopt private keys for signature identification, wherein the user copyright partitioning protocol refers to a protocol agreed under the user chain on BIM drawing copyright partitioning.
The intelligent contracts in the intelligent contract module comprise a user registration contract, a drawing modification right setting contract, a drawing content acquisition contract, a drawing content submitting contract and a drawing copyright dividing contract; the user registration contract is used for the user operation module to call and complete registration of a new user and allocation of public and private key pairs, the drawing modification right setting contract is used for the digital signature extraction verification module to call and complete digital signature extraction of a designer user and modification right setting of BIM drawing, the drawing content acquisition contract is used for the BIM drawing modification submitting module to call and complete the latest version acquisition work of the BIM drawing to be modified, the drawing content submitting contract is used for the BIM drawing modification submitting module to call and complete the uplink work of modified BIM drawing information, and the drawing copyright dividing contract is used for the BIM drawing modification submitting module to call and complete the copyright dividing work of the BIM drawing.
The related information of the BIM drawing copyright comprises a BIM drawing information chain, wherein the BIM drawing information chain is a chain storage structure formed by mutually connecting a plurality of blocks by means of block Hash values, each block comprises a block head and a block body, the block head comprises a timestamp, a father block Hash value, a local block Hash value, a block height and a Merkle root Hash value, the timestamp refers to a time point when the block is generated, the block Hash value is generated by carrying out Hash operation on the father block Hash value, the timestamp in the block head, the block height and the Merkle root Hash value, the block height refers to the serial number of the block in the block chain, and the Merkle root Hash value refers to the Hash value of a Merkle tree formed by block transactions in the block body; the block body is used for storing various records of the BIM drawing, including BIM drawing modification right setting records, BIM drawing modification records and BIM drawing copyright dividing records, wherein the BIM drawing modification right setting record data structure comprises drawing item description, designer private key signature list, global Unique Identifier (GUID) of the initial version BIM drawing, entity instance information Hash value, designer company introduction, timestamp and other information; the designer private key signature list refers to a private key signature list of all designers on an initial version BIM drawing Global Unique Identifier (GUID) and is used for verifying the identity of the designer and judging whether a user has a modification right, and the entity instance information Hash value is a Hash value which is obtained by carrying out Hash operation on all entity instance information in an IFC file and uniquely identifies all entity instance information, and the authenticity of the entity instance information under a chain is distinguished by virtue of the Hash value, so that the storage of the IFC file is supervised; the BIM drawing modification record data structure comprises a BIM drawing modification right setting record Hash, a tracing Hash, a modifier private key signature, a Globally Unique Identifier (GUID) of an initial version BIM drawing, a latest entity instance information Hash value, a time stamp and user public key information; the BIM drawing modification right setting record Hash is a transaction Hash value of the BIM drawing modification right setting record, the traceability Hash is a transaction Hash of a previous BIM drawing related record, if the modification record is a first modification record, the traceability Hash is the BIM drawing modification right setting record Hash, a modifier private key signature is a digital signature obtained by private key encryption of a Global Unique Identifier (GUID) of an initial BIM drawing by a modifier user, and the latest entity instance information Hash value is a Hash value of unique identification latest entity instance information obtained by Hash operation on latest entity instance information in an IFC file; the BIM drawing copyright dividing record data structure comprises drawing item description, BIM drawing modification right setting record Hash, tracing Hash, designer private key signature list, global Unique Identifier (GUID) of an initial edition BIM drawing, a final entity instance information Hash value, a user copyright dividing protocol and time stamp information, wherein the final entity instance information Hash value is a Hash value of unique identification final edition entity instance information obtained by carrying out Hash operation on entity instance information in a final edition IFC file.
The invention adopts a blockchain-based multi-person participation BIM drawing copyright protection system to protect the copyright of multi-person ginseng and BIM drawing, which comprises the following steps:
s1, a user submits user registration information to a user operation module for user registration, and after the system audits the user registration information, public and private key pairs are distributed to the user by adopting an elliptic curve encryption algorithm and are bound with the user registration information; the user creates a BIM model by using BIM model design software, derives an initial version BIM drawing file, submits related information of the initial version BIM drawing file to a blockchain node through a user operation module, and initiates a drawing modification right setting application;
s2, signing the global unique identifier of the unique-identification initial-version BIM drawing file by adopting a private key of a designer to obtain a digital signature list of the designer, generating BIM drawing modification right setting record transaction by calling a drawing modification right setting contract, and carrying out Kafka consensus uplink storage;
s3, a user submits a BIM drawing latest version acquisition request to the blockchain node through the user operation module, the blockchain node performs digital signature verification on the user, if the digital signature verification is passed, a drawing content acquisition contract is called to acquire a global unique identifier of the BIM drawing file from the blockchain, the corresponding latest version of the BIM drawing file is further acquired according to the identifier, and the acquisition condition of the global unique identifier is that private key signature verification is successful;
S4, the user imports the acquired latest BIM drawing file into the local BIM model design software to generate a BIM model, the BIM model design software is used for carrying out operations such as modification and innovation on the BIM model, the BIM drawing file is exported after the operation is finished, and the modification state attribute of the BIM drawing file is changed into NOCHANGE, so that modification of BIM drawing by other users and application software can be conveniently and accurately identified; then submitting the related information of the latest modified BIM drawing file to a blockchain node through a user operation module, and calling drawing content submitting contracts by the blockchain node to generate BIM drawing modification record transaction and perform Kafka consensus uplink storage, wherein the BIM drawing modification record transaction submitting conditions are that digital signature verification is successful;
s5, repeating the steps S3-S4 by all designers through collaborative creation for many times;
and S6, after the BIM model is finished in final design, all users submit user copyright partitioning protocol information signed by the private key to a block chain node through the client, and the block chain node calls a drawing copyright partitioning contract to generate BIM drawing copyright partitioning record transaction and carries out Kafka consensus uplink storage, wherein the condition of submitting the BIM drawing copyright partitioning record transaction is that all designers adopt the private key to sign.
The Kafka consensus of step S2 and step S4 of the present invention comprises the following steps:
(1) The block chain link point generates a block chain transaction according to the uplink information, and sends the block chain transaction to a designated endorsement node for endorsing;
(2) The endorsement node returns the blockchain transaction with the endorsement verification to the blockchain node, and the blockchain link node sends the blockchain transaction with the endorsement to the ordering node for ordering;
(3) After receiving the blockchain transaction for completing endorsement verification, the ordering node sends the blockchain transaction to the Kafka cluster for ordering the blockchain transactions in the same period;
(4) After the Kafka cluster finishes the sequencing of the blockchain transactions, the sequencing node periodically acquires a certain number of sequenced blockchain transactions;
(5) The sorting node packages the sorted blockchain transactions to generate new blocks, and returns the new blocks to each blockchain node for uplink storage.
The invention is applied to a blockchain system with the characteristics of decentralization, data non-falsification and time sequence block chain.
Compared with the prior art, a user submits related information of initializing the BIM drawing through the blockchain node, initiates a BIM drawing modification right setting request, triggers a drawing modification right setting contract to generate BIM drawing modification right transaction and stores the BIM drawing modification right transaction in a uplink manner; a user submits a BIM drawing latest version acquisition request through a blockchain node, the user acquires the latest version BIM drawing through modification right verification, and after the user finishes modification, the user triggers a drawing content submitting contract to generate BIM drawing modification transaction and uplink storage; if the BIM drawing final creation is completed, all participating designers negotiate to reach a copyright division agreement protocol, and trigger drawing copyright division contracts to generate copyright division transactions and store the copyright division transactions in a uplink manner, the method has the following advantages: firstly, a hash algorithm is adopted to generate a hash value of a unique mark BIM drawing modification content, and the hash value is recorded in a BIM drawing modification record and automatically stored in a chain by means of intelligent contracts, so that accurate recording of BIM drawing versions is ensured; secondly, the BIM drawing modification right setting function is completed by adopting an asymmetric encryption technology and an intelligent contract technology, and the security of BIM drawing information is ensured by adopting a technology of decrypting and verifying a private key signature through a public key; the modification records of different versions in the multi-user collaborative creation process of the BIM drawing are accurately recorded by utilizing the non-tamperable characteristic of the blockchain, the hash value is used as a version characteristic value, the authenticity of entity instance information under the chain is distinguished by means of the hash value, the storage of the IFC file is supervised, and powerful proof is provided for the work contribution of a designer; and fourthly, a copyright dividing function is set for BIM drawings completed by multi-person cooperation, copyright attribution division is decided by negotiations of all designers, and copyright dividing certificates are signed together by all the designers to take effect, so that the copyright interests of each designer are ensured.
Description of the drawings:
fig. 1 is a schematic block diagram of a blockchain-based multi-person-participation BIM drawing copyright protection system according to the present invention.
Fig. 2 is a schematic diagram of module function call of the blockchain-based multi-person participation BIM drawing copyright protection system according to the present invention.
FIG. 3 is a scene flow chart of the blockchain-based multi-person participation BIM drawing copyright protection method.
FIG. 4 is a flowchart of the blockchain-based multi-person participation BIM drawing copyright protection method of the present invention.
Fig. 5 is a schematic structural diagram of the BIM drawing information chain according to the present invention.
Fig. 6 is a schematic structural diagram of a block in a BIM drawing information chain according to the present invention.
FIG. 7 is a flow chart of the Kafka consensus mechanism according to the present invention.
The specific embodiment is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
Examples:
the block chain-based multi-person participation BIM drawing copyright protection system module structure is shown in fig. 1, a module function call diagram is shown in fig. 2, the system mainly comprises a user operation module, a digital signature extraction and verification module, a BIM drawing modification and submission module, an intelligent contract module and a block chain storage module, wherein the user operation module is respectively in communication connection with the digital signature extraction and verification module and the BIM drawing modification and submission module, the user operation module is used for providing user registration and BIM drawing information uploading functions for users, the digital signature extraction and verification module is used for extracting and verifying user digital signatures, and generating BIM drawing modification right setting records to complete modification right setting of BIM drawings by calling drawing modification right setting contracts, and storing BIM drawing modification right setting records in a chain; the BIM drawing modification submitting module is used for acquiring the latest version drawing information, submitting the modification version BIM drawing information and initiating drawing copyright division; the BIM drawing modification submitting module is respectively in communication connection with the intelligent contract module and the blockchain storage module, the digital signature submitting verifying module is respectively in communication connection with the intelligent contract module and the blockchain storage module, the intelligent contract module is used for providing intelligent contracts with corresponding functions for all modules, intelligent contract calling requests of all modules are processed, and the blockchain storage module is used for storing relevant information of BIM drawing copyrights.
The user registration in this embodiment means that a new user submits user registration information including a user name, an identity card number and a user password, and the system allocates a corresponding public-private key pair to the user by adopting an elliptic curve encryption algorithm according to the registration information, and binds the user password and the user name to the public-private key pair, wherein public key disclosure is used for verifying private key signature, and private key confidentiality is used for signing and identifying user ownership.
The BIM drawing information uploading means that a user uploads a BIM drawing to a blockchain system through a user operation module, and the BIM drawing information uploading comprises initial-version BIM drawing information uploading, modified-version BIM drawing information uploading and final-version BIM drawing information uploading, wherein before the initial-version BIM drawing information uploading, related information of the initial-version BIM drawing and related information of the user are submitted to a digital signature extraction verification module through the user operation module to carry out digital signature extraction; before the information of the BIM drawing of the modification version is uploaded, the related information of the BIM drawing of the modification version and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module to verify the modification right; before uploading the information of the final BIM drawing, the related information of the final BIM drawing and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module for modification right verification; wherein the related information of the user is a user name and a user password; the relevant information of the BIM drawing is file header information and all entity instance information in an IFC file, wherein the file header information in the IFC file comprises IFC version information, an application program for outputting the IFC file, file output time, user information of BIM model design software and enterprise information of a user; all entity instance information comprises a Global Unique Identifier (GUID), model creator information, model creation application software, creation time, modifier information, model modification application software, modification time and modification action information, an application program outputting an IFC file is an application program converting a BIM model into the IFC file, the Global Unique Identifier (GUID) is an international identifier for uniquely identifying the IFC file, the identifier corresponds to the IFC file one by one, and modification of the content of the IFC file does not cause modification of the global unique identifier; the model creator information means user information set when creating a model in the BIM model design software, and is set as information of all design participants, and the modification action information means a modification record of the BIM model by the designer.
In the digital signature extraction and verification module of the embodiment, after the initial version of BIM drawing information is uploaded, a user private key is adopted to sign a globally unique identifier in entity instance information, so as to obtain a digital signature for identifying the user to modify the drawing, and the digital signature extraction is aimed at all designers; before the user modifies the BIM drawing, the user adopts a public key to carry out private key signature decryption verification according to the global unique identifier and the digital signature of the BIM drawing of the initial edition on the chain, judges whether the user has the modification right of the BIM drawing, and can acquire the BIM drawing of the latest edition if the verification is successful; after the user completes BIM drawing modification, the modified BIM drawing information is stored in a uplink mode, and meanwhile public key decryption digital signature verification is needed, and whether the user has modification rights is judged; the modification right setting of the BIM drawing aims at the initial version BIM drawing, and a digital signature is adopted to set which designer users can acquire and review the drawing and can store the information of the modification version BIM drawing in a linking way after the drawing is modified.
Acquiring the latest version of drawing information in the BIM drawing modification and submission module in the embodiment means that when multiple persons collaboratively create a BIM model, a global unique identifier of the BIM drawing file is acquired from a blockchain by calling a drawing content acquisition contract, the BIM drawing file of the latest version is acquired according to the identifier, and the acquisition condition of the global unique identifier is that private key signature verification is successful; submitting BIM drawing information of a modification version means that after a user modifies a BIM model through BIM model design software, a BIM drawing file is derived, a BIM drawing modification record is generated according to the latest BIM drawing information by calling a drawing content submitting contract and submitted to a blockchain network, and the drawing modification record information submitting condition is that digital signature verification is successful; the drawing copyright partitioning is to analyze user work contribution according to BIM drawing modification right setting records, BIM drawing modification records and user copyright partitioning protocols on a chain, partition the copyright of the drawing, and the copyright partitioning result requires that all designers adopt private keys for signature identification, wherein the user copyright partitioning protocol refers to a protocol agreed under the user chain on BIM drawing copyright partitioning.
The intelligent contracts in the intelligent contract module in the embodiment comprise a user registration contract, a drawing modification right setting contract, a drawing content acquisition contract, a drawing content submitting contract and a drawing copyright dividing contract; the user registration contract is used for the user operation module to call and complete registration of a new user and allocation of public and private key pairs, the drawing modification right setting contract is used for the digital signature extraction verification module to call and complete digital signature extraction of a designer user and modification right setting of BIM drawing, the drawing content acquisition contract is used for the BIM drawing modification submitting module to call and complete the latest version acquisition work of the BIM drawing to be modified, the drawing content submitting contract is used for the BIM drawing modification submitting module to call and complete the uplink work of modified BIM drawing information, and the drawing copyright dividing contract is used for the BIM drawing modification submitting module to call and complete the copyright dividing work of the BIM drawing.
The related information of the copyright of the BIM drawing in the embodiment comprises a BIM drawing information chain, and the structure is shown in fig. 5; the BIM drawing information chain is a chain storage structure formed by mutually connecting a plurality of blocks by means of block Hash values, each block comprises a block head and a block body, the block structure is shown in figure 6, the block head comprises a timestamp, a father block Hash value, a self block Hash value, a block height and a Merkle root Hash value, wherein the timestamp refers to a time point when the block is generated, the block Hash value is generated by carrying out Hash operation on the father block Hash value, the timestamp in the block head, the block height and the Merkle root Hash value, the block height refers to the sequence number of the self block in the block chain, and the Merkle root Hash value refers to the Hash value of a Merkle tree formed by block transactions in the block body; the block body is used for storing various records of the BIM drawing, including BIM drawing modification right setting records, BIM drawing modification records and BIM drawing copyright dividing records, wherein the data structure of the BIM drawing modification right setting records is shown in table 1, and the BIM drawing modification right setting records comprise drawing item description, designer private key signature list, global Unique Identifier (GUID) of the initial version BIM drawing, entity instance information Hash value, designer company introduction, timestamp and other information; the designer private key signature list refers to a private key signature list of all designers on an initial version BIM drawing Global Unique Identifier (GUID) and is used for verifying the identity of the designer and judging whether a user has a modification right, and the entity instance information Hash value is a Hash value which is obtained by carrying out Hash operation on all entity instance information in an IFC file and uniquely identifies all entity instance information, and the authenticity of the entity instance information under a chain is distinguished by virtue of the Hash value, so that the storage of the IFC file is supervised; the BIM drawing modification record data structure is shown in table 2 and comprises a BIM drawing modification right setting record Hash, a tracing Hash, a modifier private key signature, a Globally Unique Identifier (GUID) of an initial BIM drawing, a latest entity instance information Hash value, a timestamp and user public key information; the BIM drawing modification right setting record Hash is a transaction Hash value of the BIM drawing modification right setting record, the traceability Hash is a transaction Hash of a previous BIM drawing related record, if the modification record is a first modification record, the traceability Hash is the BIM drawing modification right setting record Hash, a modifier private key signature is a digital signature obtained by private key encryption of a Global Unique Identifier (GUID) of an initial BIM drawing by a modifier user, and the latest entity instance information Hash value is a Hash value of unique identification latest entity instance information obtained by Hash operation on latest entity instance information in an IFC file; the BIM drawing copyright dividing record data structure is shown in table 3, and comprises drawing item description, BIM drawing modification right setting record Hash, tracing Hash, designer private key signature list, global Unique Identifier (GUID) of the initial version BIM drawing, final entity instance information Hash value, user copyright dividing protocol and time stamp information, wherein the final entity instance information Hash value is a Hash value of unique identification final version entity instance information obtained by carrying out Hash operation on entity instance information in a final version IFC file.
Table 1:
table 2:
table 3:
the specific process of the block chain-based multi-person participation BIM drawing copyright protection system for protecting the copyright of the multi-person ginseng and the BIM drawing comprises the following steps:
s1, a user submits user registration information to a user operation module for user registration, and after the system audits the user registration information, public and private key pairs are distributed to the user by adopting an elliptic curve encryption algorithm and are bound with the user registration information; the user creates a BIM model by using BIM model design software, derives an initial version BIM drawing file, submits related information of the initial version BIM drawing file to a blockchain node through a user operation module, and initiates a drawing modification right setting application;
s2, signing the global unique identifier of the unique-identification initial-version BIM drawing file by adopting a private key of a designer to obtain a digital signature list of the designer, generating BIM drawing modification right setting record transaction by calling a drawing modification right setting contract, and carrying out Kafka consensus uplink storage;
s3, a user submits a BIM drawing latest version acquisition request to the blockchain node through the user operation module, the blockchain node performs digital signature verification on the user, if the digital signature verification is passed, a drawing content acquisition contract is called to acquire a global unique identifier of the BIM drawing file from the blockchain, the corresponding latest version of the BIM drawing file is further acquired according to the identifier, and the acquisition condition of the global unique identifier is that private key signature verification is successful;
S4, the user imports the acquired latest BIM drawing file into the local BIM model design software to generate a BIM model, the BIM model design software is used for carrying out operations such as modification and innovation on the BIM model, the BIM drawing file is exported after the operation is finished, and the modification state attribute of the BIM drawing file is changed into NOCHANGE, so that modification of BIM drawing by other users and application software can be conveniently and accurately identified; then submitting the related information of the latest modified BIM drawing file to a blockchain node through a user operation module, and calling drawing content submitting contracts by the blockchain node to generate BIM drawing modification record transaction and perform Kafka consensus uplink storage, wherein the BIM drawing modification record transaction submitting conditions are that digital signature verification is successful;
s5, repeating the steps S3-S4 by all designers through collaborative creation for many times;
and S6, after the BIM model is finished in final design, all users submit user copyright partitioning protocol information signed by the private key to a block chain node through the client, and the block chain node calls a drawing copyright partitioning contract to generate BIM drawing copyright partitioning record transaction and carries out Kafka consensus uplink storage, wherein the condition of submitting the BIM drawing copyright partitioning record transaction is that all designers adopt the private key to sign.
The Kafka consensus flow described in step S2 and step S4 in this embodiment is shown in fig. 6, and includes the following steps:
(1) The block chain link point generates a block chain transaction according to the uplink information, and sends the block chain transaction to a designated endorsement node for endorsing;
(2) The endorsement node returns the blockchain transaction with the endorsement verification to the blockchain node, and the blockchain link node sends the blockchain transaction with the endorsement to the ordering node for ordering;
(3) After receiving the blockchain transaction for completing endorsement verification, the ordering node sends the blockchain transaction to the Kafka cluster for ordering the blockchain transactions in the same period;
(4) After the Kafka cluster finishes the sequencing of the blockchain transactions, the sequencing node periodically acquires a certain number of sequenced blockchain transactions;
(5) The sorting node packages the sorted blockchain transactions to generate new blocks, and returns the new blocks to each blockchain node for uplink storage.
Claims (6)
1. A multi-person participation BIM drawing copyright protection system based on a blockchain is characterized in that a main structure comprises a user operation module, a digital signature extraction verification module, a BIM drawing modification submission module, an intelligent contract module and a blockchain storage module, wherein the user operation module is respectively in communication connection with the digital signature extraction verification module and the BIM drawing modification submission module, the user operation module is used for providing user registration and BIM drawing information uploading functions for a user, the digital signature extraction verification module is used for extracting and verifying a user digital signature, and generating a BIM drawing modification right setting record by calling a drawing modification right setting contract to complete the modification right setting of a BIM drawing, and storing the BIM drawing modification right setting record in a uplink manner; the BIM drawing modification submitting module is used for acquiring the latest version drawing information, submitting the modification version BIM drawing information and initiating drawing copyright division; the BIM drawing modification submitting module is respectively in communication connection with the intelligent contract module and the blockchain storage module, the digital signature submitting verifying module is respectively in communication connection with the intelligent contract module and the blockchain storage module, and is used for providing intelligent contracts with corresponding functions for all modules, processing intelligent contract calling requests of all modules and storing related information of BIM drawing copyrights;
The BIM drawing information uploading means that a user uploads BIM drawing information to a node of a blockchain system for processing through a user operation module, and the BIM drawing information uploading comprises initial BIM drawing information uploading, modified BIM drawing information uploading and final BIM drawing information uploading, wherein before the initial BIM drawing information uploading, related information of the initial BIM drawing and related information of the user are submitted to a digital signature extraction verification module through the user operation module for digital signature extraction; before the information of the BIM drawing of the modification version is uploaded, the related information of the BIM drawing of the modification version and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module to verify the modification right; before uploading the information of the final BIM drawing, the related information of the final BIM drawing and the related information of a user are submitted to a BIM drawing modification submitting module through a user operation module for modification right verification; wherein the related information of the user is a user name and a user password; the relevant information of the BIM drawing is file header information and all entity instance information in an IFC file, wherein the file header information in the IFC file comprises IFC version information, an application program for outputting the IFC file, file output time, user information of BIM model design software and enterprise information of a user; all entity instance information comprises a global unique identifier, model creator information, model creation application software, creation time, modifier information, model modification application software, modification time and modification action information, an application program outputting an IFC file is an application program converting a BIM model into the IFC file, the global unique identifier is an international identifier for uniquely identifying the IFC file, the identifier corresponds to the IFC file one by one, and modification of the content of the IFC file does not cause modification of the global unique identifier; the model creator information is user information set when creating a model in BIM model design software, and is set as information of all design participants, and the modification action information is modification record of a designer on the BIM model;
The digital signature extraction and verification module is used for carrying out private key signature on a global unique identifier in entity instance information by adopting a user private key after the initial version BIM drawing information is uploaded to obtain a digital signature for marking the user's right to modify the drawing, and the digital signature extraction is aimed at all designers; before the user modifies the BIM drawing, the user adopts a public key to carry out private key signature decryption verification according to the global unique identifier and the digital signature of the BIM drawing of the initial edition on the chain, judges whether the user has the modification right of the BIM drawing, and can acquire the BIM drawing of the latest edition if the verification is successful; after the user completes BIM drawing modification, the modified BIM drawing information is stored in a uplink mode, and meanwhile public key decryption digital signature verification is needed, and whether the user has modification rights is judged; the modification right setting of the BIM drawing aims at the initial version BIM drawing, and a digital signature is adopted to set which designer users can acquire and review the drawing and can store the information of the modification version BIM drawing in a linking way after the drawing is modified;
acquiring the latest version of drawing information in the BIM drawing modification and submission module means that when a BIM model is cooperatively authored by multiple persons, a global unique identifier of the BIM drawing file is acquired from a blockchain by calling a drawing content acquisition contract, the BIM drawing file of the latest version is acquired according to the identifier, and the acquisition condition of the global unique identifier is that private key signature verification is successful; submitting BIM drawing information of a modification version means that after a user modifies a BIM model through BIM model design software, a BIM drawing file is derived, a BIM drawing modification record is generated according to the latest BIM drawing information by calling a drawing content submitting contract and submitted to a blockchain network, and the drawing modification record information submitting condition is that digital signature verification is successful; the drawing copyright partitioning is to analyze user work contribution according to BIM drawing modification right setting records, BIM drawing modification records and user copyright partitioning protocols on a chain, partition the copyright of the drawing, and the copyright partitioning result requires that all designers adopt private keys for signature identification, wherein the user copyright partitioning protocol refers to a protocol agreed under the user chain on BIM drawing copyright partitioning.
2. The blockchain-based multi-person participation BIM drawing copyright protection system is characterized in that the user registration means that a new user submits user registration information comprising a user name, an identity card number and a user password, the system adopts an elliptic curve encryption algorithm to allocate a corresponding public-private key pair for the user according to the registration information, and binds the user password and the user name to the public-private key pair, wherein public key disclosure is used for verifying private key signature, and private key confidentiality is used for signature identification of user ownership.
3. The blockchain-based multi-person participation BIM drawing copyright protection system of claim 1, wherein the intelligent contracts in the intelligent contract module comprise a user registration contract, a drawing modification right setting contract, a drawing content acquisition contract, a drawing content submission contract and a drawing copyright division contract; the user registration contract is used for the user operation module to call and complete registration of a new user and allocation of public and private key pairs, the drawing modification right setting contract is used for the digital signature extraction verification module to call and complete digital signature extraction of a designer user and modification right setting of BIM drawing, the drawing content acquisition contract is used for the BIM drawing modification submitting module to call and complete the latest version acquisition work of the BIM drawing to be modified, the drawing content submitting contract is used for the BIM drawing modification submitting module to call and complete the uplink work of modified BIM drawing information, and the drawing copyright dividing contract is used for the BIM drawing modification submitting module to call and complete the copyright dividing work of the BIM drawing.
4. The system for protecting the copyrights of the multi-person participation BIM drawing based on the blockchain according to claim 1, wherein the related information of the copyrights of the BIM drawing comprises a BIM drawing information chain which is a chain storage structure formed by mutually connecting a plurality of blocks by virtue of block Hash values, each block comprises a block head and a block body, the block head comprises a timestamp, a father block Hash value, a local block Hash value, a block height and a Merkle root Hash value, wherein the timestamp refers to a time point when the block is generated, the block Hash value is generated by carrying out Hash operation on the father block Hash value, the timestamp in the block head, the block height and the Merkle root Hash value, the block height refers to the serial number of the block in the blockchain, and the Merkle root Hash value refers to the Hash value of a Merkle tree formed by block transactions in the block body; the block body is used for storing various records of the BIM drawing, including BIM drawing modification right setting records, BIM drawing modification records and BIM drawing copyright dividing records, wherein the BIM drawing modification right setting record data structure comprises drawing item description, designer private key signature list, global unique identifier of the initial version BIM drawing, entity instance information Hash value, designer company introduction and timestamp information; the designer private key signature list refers to a private key signature list of a global unique identifier of the initial version BIM drawing by all designers, is used for verifying the identity of the designer and judging whether a user has a modification right, and the entity instance information Hash value is a Hash value which is obtained by carrying out Hash operation on all entity instance information in the IFC file and uniquely identifies all entity instance information, and the authenticity of the entity instance information under the chain is distinguished by virtue of the Hash value, so that the storage of the IFC file is supervised; the BIM drawing modification record data structure comprises a BIM drawing modification right setting record Hash, a tracing Hash, a modifier private key signature, a global unique identifier of an initial version BIM drawing, a latest entity instance information Hash value, a time stamp and user public key information; the BIM drawing modification right setting record Hash is a transaction Hash value of the BIM drawing modification right setting record, the traceability Hash is a transaction Hash of a previous BIM drawing related record, if the modification record is a first modification record, the traceability Hash is the BIM drawing modification right setting record Hash, the modifier private key signature is a digital signature obtained by private key encryption of a global unique identifier of an initial BIM drawing by a user of the modifier, and the latest entity instance information Hash value is a Hash value of unique identification latest entity instance information obtained by Hash operation aiming at latest entity instance information in an IFC file; the BIM drawing copyright dividing record data structure comprises drawing item description, BIM drawing modification right setting record Hash, tracing Hash, designer private key signature list, global unique identifier of an initial edition BIM drawing, final entity instance information Hash value, user copyright dividing protocol and timestamp information, wherein the final entity instance information Hash value is a Hash value of unique identification final edition entity instance information obtained by carrying out Hash operation on entity instance information in a final edition IFC file.
5. A method for realizing the copyright protection of a plurality of persons participating in BIM drawing by adopting the system as claimed in claim 1, which is characterized in that the specific process comprises the following steps:
s1, a user submits user registration information to a user operation module for user registration, and after the system audits the user registration information, public and private key pairs are distributed to the user by adopting an elliptic curve encryption algorithm and are bound with the user registration information; the user creates a BIM model by using BIM model design software, derives an initial version BIM drawing file, submits related information of the initial version BIM drawing file to a blockchain node through a user operation module, and initiates a drawing modification right setting application;
s2, signing the global unique identifier of the unique-identification initial-version BIM drawing file by adopting a private key of a designer to obtain a digital signature list of the designer, generating BIM drawing modification right setting record transaction by calling a drawing modification right setting contract, and carrying out Kafka consensus uplink storage;
s3, a user submits a BIM drawing latest version acquisition request to the blockchain node through the user operation module, the blockchain node performs digital signature verification on the user, if the digital signature verification is passed, a drawing content acquisition contract is called to acquire a global unique identifier of the BIM drawing file from the blockchain, the corresponding latest version of the BIM drawing file is further acquired according to the identifier, and the acquisition condition of the global unique identifier is that private key signature verification is successful;
S4, importing the acquired latest BIM drawing file into the local BIM model design software by a user to generate a BIM model, modifying and innovating the BIM model by the BIM model design software, exporting the BIM drawing file after the operation is finished, and changing the modification state attribute of the BIM drawing file into NOCHANGE, so that the modification of the BIM drawing by other users and application software can be conveniently and accurately identified; then submitting the related information of the latest modified BIM drawing file to a blockchain node through a user operation module, and calling drawing content submitting contracts by the blockchain node to generate BIM drawing modification record transaction and perform Kafka consensus uplink storage, wherein the BIM drawing modification record transaction submitting conditions are that digital signature verification is successful;
s5, repeating the steps S3-S4 by all designers through collaborative creation for many times;
and S6, after the BIM model is finished in final design, all users submit user copyright partitioning protocol information signed by the private key to a block chain node through the client, and the block chain node calls a drawing copyright partitioning contract to generate BIM drawing copyright partitioning record transaction and carries out Kafka consensus uplink storage, wherein the condition of submitting the BIM drawing copyright partitioning record transaction is that all designers adopt the private key to sign.
6. The method for protecting copyrights of a BIM drawing according to claim 5, wherein the Kafka consensus between the step S2 and the step S4 includes the steps of:
(1) The block chain link point generates a block chain transaction according to the uplink information, and sends the block chain transaction to a designated endorsement node for endorsing;
(2) The endorsement node returns the blockchain transaction with the endorsement verification to the blockchain node, and the blockchain link node sends the blockchain transaction with the endorsement to the ordering node for ordering;
(3) After receiving the blockchain transaction for completing endorsement verification, the ordering node sends the blockchain transaction to the Kafka cluster for ordering the blockchain transactions in the same period;
(4) After the Kafka cluster finishes the sequencing of the blockchain transactions, the sequencing node periodically acquires a certain number of sequenced blockchain transactions;
(5) The sorting node packages the sorted blockchain transactions to generate new blocks, and returns the new blocks to each blockchain node for uplink storage.
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