CN113362073A - Virtual asset disposal method based on block chain non-homogenization evidence - Google Patents
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Abstract
The invention discloses a virtual asset disposal method based on block chain non-homogenization evidence, which generates corresponding virtual assets for entity products, binds the entity products and the virtual assets and realizes the anti-counterfeiting tracing effect. The technical scheme is as follows: receiving the input of the entity product information of the entity product in the production link and the corresponding NFT virtual asset matching information by the block chain; automatically creating NFT virtual assets on a blockchain according to input information; generating unique identification codes of NFT virtual assets and entity products and placing the unique identification codes on the entity products so that the entity products have real use value and virtual value at the same time; the NFT virtual asset records production information, logistics information and/or sales information of entity products; after the entity product is purchased by the consumer, the consumer acquires the NFT virtual asset through the unique identification code of the corresponding virtual asset so as to have ownership of the NFT virtual asset.
Description
Technical Field
The invention relates to a technology for processing links such as production, transaction and the like of a real product by using a virtual asset of a block chain, in particular to a technology for processing links such as generation, transaction and the like of the real product by using the virtual asset based on a non-homogeneous evidence transfer (NFT) mechanism of the block chain.
Background
Traditionally centralized virtual world products are freely replicated and enhanced at almost 0 cost, while no two products in the real world are identical, each of which is unique. Therefore, the real world product and the virtual world product are always split, and the one-to-one correspondence relationship cannot be established.
For example, in the real world, brands of goods are becoming increasingly valuable. The fake commodity is basically the same as the genuine commodity in the aspects of manufacturing process and material. These similar goods are not authorized by the brand name, and their production causes huge value damage to the genuine goods value of the brand name, which affects the scarcity of the brand name products. For example, a cup brand company a authorizes the hip-hop monkey brand to produce 1000 hip-hop monkey cups for the B factory, and suppose that the B factory or the C factory produces 10000 hip-hop monkey cups with the same quality material. There are 11000 hip-hop monkey cups that can't be distinguished on that market, and the selling value of brand merchant product can receive huge influence.
The traditional anti-counterfeiting method is that manufacturers use commodity serial numbers to perform anti-counterfeiting, but many users have weak anti-counterfeiting awareness and cannot actively inquire the anti-counterfeiting, so that the anti-counterfeiting effect is weak.
Disclosure of Invention
The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.
The invention aims to solve the problems and provides a virtual asset disposal method based on block chain non-homogenization evidence, which is used for binding real-world products and virtual values by generating corresponding virtual assets for the real-world products, thereby realizing the anti-counterfeiting tracing effect.
The technical scheme of the invention is as follows: the invention discloses a virtual asset disposal method based on block chain non-homogenization evidence, which comprises the following steps:
step 1: the block chain receives the input of the entity product information of the entity product in the production link and the corresponding non-homogenization evidence virtual asset matching information;
step 2: automatically creating non-homogeneous evidence-communicated virtual assets on the block chain according to the information input in the step 1;
and step 3: generating unique identification codes of virtual assets and entity products of the non-homogenization certification and placing the unique identification codes on the entity products so that the entity products have double values of real use value and virtual value at the same time;
and 4, step 4: recording production information, logistics information and/or sales information of the physical product by the non-homogeneous evidence-based virtual asset;
and 5: after the entity product is purchased by a consumer, the consumer obtains the non-homogeneous accredited virtual asset through the unique identification code of the corresponding virtual asset so as to have ownership of the non-homogeneous accredited virtual asset.
According to an embodiment of the virtual asset handling method based on block chain non-homogenization evidence, the unique identification codes of the virtual assets and the physical products are in one-to-one correspondence, so that the physical products and the virtual assets are in one-to-one correspondence and are mutually associated.
According to an embodiment of the virtual asset disposal method based on the block chain non-homogenization certification, production information is provided by a manufacturer through a two-dimensional code of an entity product, logistics information is provided by a logistics manufacturer through the two-dimensional code of the entity product, and sales information is provided by a dealer through the two-dimensional code of the entity product.
According to an embodiment of the virtual asset handling method based on block chain non-homogenous certification of the present invention, the method further comprises a process after the consumer purchases the physical product:
after the attributes of the virtual assets are upgraded, a new non-homogeneous certified virtual asset is generated on the block chain without a corresponding entity product, and the corresponding entity product can be produced based on the new non-homogeneous certified virtual asset application.
According to an embodiment of the virtual asset handling method based on block chain non-homogenous certification of the present invention, the method further comprises a process after the consumer purchases the physical product:
and judging the entity product corresponding to the virtual asset without the non-homogenization evidence as a fake product.
According to an embodiment of the virtual asset handling method based on block chain non-homogenous certification of the present invention, the method further comprises a process after the consumer purchases the physical product:
non-homogenous certified virtual assets are permanently stored and collected.
Compared with the prior art, the invention has the following beneficial effects: the invention correspondingly generates NFT (Non-homogeneous token) virtual assets on the block chain for the products in the real world, and the virtual assets become unique assets which cannot be copied through the Non-homogeneous token of the block chain so as to be similar to the products in the real world. When the NFT virtual assets are handed over to the user, the developer cannot control the deletion and transfer of the virtual assets.
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The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings. In the drawings, components are not necessarily drawn to scale, and components having similar relative characteristics or features may have the same or similar reference numerals.
FIG. 1 illustrates a flow diagram of an embodiment of a virtual asset handling method of the present invention based on blockchain non-homogenous certification.
FIG. 2 illustrates a flow chart of the virtual asset disposition process of the present invention after a consumer purchases a physical product.
FIG. 3 is a schematic diagram illustrating the upgrading of a virtual asset after a consumer purchases a physical product in accordance with the present invention.
FIG. 4 shows a schematic diagram of the present invention in which a consumer obtains a non-homogenous certified virtual asset through a unique identification code of the corresponding virtual asset in step 5 shown in FIG. 1.
Fig. 5 is a block chain architecture diagram of the present invention.
Fig. 6 and 7 are schematic diagrams illustrating the operation of the data on the blockchain according to the present invention.
FIG. 8 shows a field diagram for accounts on the blockchain of the present invention.
Fig. 9 shows a schematic diagram of the operation on the blockchain of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.
An embodiment of the block chain based non-homogenous evidence based virtual asset handling method of the present invention is for example the process of product from production to consumer purchase, as shown in fig. 1.
Step 1: and the block chain receives the input of the entity product information of the entity product in the production link and the corresponding non-homogenization evidence virtual asset matching information.
Physical products include, but are not limited to: clothing, fast-moving goods, automobiles, IT products, household appliances, digital products, cases, jewelry, wines, toy musical instruments and furniture. The entity product information includes information such as product name, type, quantity, commodity number, place of origin, and can also be a picture of the entity product.
The virtual asset matching information of non-homogeneous certification (NFT) is a textual or graphical description of the physical product.
Due to the special properties of blockchains, non-homogeneous certification (NFT) results in virtual assets that can have unique non-duplicable properties, unlike traditionally centralized virtual assets. The known NFT protocol type is similar to the ERC721 protocol, ERC1155 protocol, in etherhouses. Besides the etherhouses, the NFT protocol on the own chain is also successively introduced on other block chains, and is a virtual asset which is unique and inseparable in nature. The most well-known representative NFT virtual asset is the ERC721 asset of CryptoKitties. After the NFT virtual assets are handed over to the user, the developer cannot implement control such as deletion and transfer.
Step 2: a corresponding number of non-homogenous evidence (NFT) virtual assets are automatically created on the blockchain according to the information entered in step 1.
The created virtual assets contain information of entity products and virtual asset matching information thereof.
First, information of a physical product and appearance information of an NFT virtual asset desired to be generated are input on a platform. The platform then generates intelligent contracts on the blockchain based on these information inputs.
As shown in fig. 5, the intelligent contract information data with NFT is sent to the consensus node of the network layer, and after the consensus node completes verification, the information is packaged and sent to the storage layer in a blockchain structure, so as to store the information into a block. After this operation, the NFT is permanently stored in the blockchain and cannot be deleted.
And step 3: and generating unique identification codes of the virtual assets and the entity products of the non-homogeneous evidence and placing the unique identification codes on the entity products so that the entity products have double values of real use value and virtual value at the same time. The unique identification codes of the two are in one-to-one correspondence, the entity product has the information of the unique identification codes of the two, and the virtual asset also has the information of the unique identification codes of the two, so that the entity product and the virtual asset are in one-to-one correspondence and are mutually related.
In this example, the unique identification code is a DNA code shown in FIG. 1.
And 4, step 4: the non-homogenous certified virtual assets record production information, logistics information and/or sales information of the physical products.
The production information is provided by a manufacturer by scanning the two-dimensional code of the entity product, and is information of the entity product in a production link, for example, the production information includes information of production raw materials, processing information, packaging information, quality inspection information, and the like.
The logistics information is provided by a logistics manufacturer by scanning the two-dimensional code of the entity product and is the information of the entity product in the transportation link.
The sales information is provided by the dealer by scanning the two-dimensional code of the physical product, and is the information of the physical product in the sales link.
And 5: after the entity product is purchased by a consumer, the consumer obtains the non-homogeneous accredited virtual asset through the unique identification code of the corresponding virtual asset so as to have ownership of the non-homogeneous accredited virtual asset, and the value of the virtual asset is permanent.
After a consumer purchases a physical product, the corresponding non-homogeneous evidence-based virtual asset is obtained by scanning the unique identification code (two-dimensional code) of the virtual asset and is placed in a virtual wallet (such as a mobile wallet) of the consumer.
For example, as shown in fig. 4, a consumer scans NFT virtual asset two-dimensional codes on a physical product with a wallet APP, calls a consumer contract on a blockchain, calls an Oracle contract through a link request, the Oracle contract writes the link request into a log on the blockchain, and the log is subscribed to acquire the request information. Real data is requested at a block chain link point, the external data obtains a result, the Genesis database data transmits the result to an Oracle contract on a chain through tx (transition) operation, the result is returned to a consumer contract, and a user obtains NFT virtual assets.
Referring to fig. 6 and 7, in a single node, data is stored in the form of a BlockChain (BlockChain). The Block chain consists of blocks (blocks) that are strung together one after the other. A new block is generated on the block chain about every ten seconds, and various information in the period is recorded. As shown in fig. 8, prevasah refers to the hash of the previous block; TMESTAMP refers to a time stamp, i.e., a complete, verifiable piece of data, usually a sequence of characters, that indicates that a piece of data existed before a particular time, uniquely identifying the time of the moment; NUMBER refers to the NUMBER of blocks, the NUMBER of blocks is increasing, NUMBER means the NUMBER of blocks, and the NUMBER of blocks (or block height) is the same; STATE _ ROOT refers to the ROOT node of the current STATE. Each account on the blockchain contains the following fields: account Balance, Nonce (when the account is an external account, the transaction serial number created by the account is represented, and 1 is added every transaction, when the account is a contract account, the contract serial number created by the account is represented, and 1 is added every time the account is created), CodeHash (when the account is a contract account, the hash value of the contract is represented, otherwise, the hash value of the empty character string is represented), and StorageRoot (a root hash value obtained after the storage content of the account forms a Merkle tree). The operations for performing the correlation class in the block chain mainly include: a Block chain data class, a Block data class, a Block header information class, a State status information class (each Block instance contains a State member variable), a Client class (in response to RPC calls, manages transactions, Block acceptance and processing). As shown in fig. 9, a level db is used as an underlying database on a chain, which is a very efficient kv database implemented by google. Both key and value are byte arrays of arbitrary length. The database provides basic interface operations including Put (), Delete (), Get (), Batch (), and supports atomicity of Batch operations. The coding mode adopts RLP (Recursive Length Prefix) which is a coding algorithm used for coding binary data of any nested structure, and is a main method for data serialization/deserialization in the Etherns, and data structures such as blocks, transactions and the like are stored in a database after being subjected to RLP coding during persistence.
The main data storage and operation flow is described as follows:
database reading:
the BlockChain and Client classes open up three level DB database connections at initialization:
(1) blocksDB stores the subject content of the block, including the block header and the transaction.
(2) stateDB, which maintains the state data of the account.
(3) And the extrasDB stores receipt information and other auxiliary information.
And (II) the client terminal may need to load block data or read account information in the running process. The specific process is as follows:
(1) loading block data from a database
When the Client class is initialized, all the block data is not loaded into the memory, but is loaded as required in the running process. When the corresponding block needs to be generated according to the block number, the flow is as follows:
-reading the chunk hash value from the extraDB with the chunk number key.
Calling Block class provides a synchronization method (sync (BlockChain, h256)), taking Block hash as key, and reading rlp the encoded Block data. In the process, the query result is cached, so that the query result does not need to be read in a database for the second time.
Decoding the Block data, and according to a set rule, sequentially reading the parent Block hash, the tertiary Block hash, the author address, the state tree root hash, the transaction tree root hash, the receipt tree root hash, the intra-Block transaction, and so on, to fill in the Block corresponding field.
(2) The account information is read from the database.
The account information includes the balance, the memory, the Nonce, and the hash of the bytecode corresponding to the address. To read account information under a block, we first perform the previous step to get the state root hash of the block data tree.
One difference between this MPT state tree and the normal tree is: the parent node holds the hash value of the child node instead of a pointer to the child node. The hash value of each node is key, the character string coded by the node content rlp is value, and the value is stored in the levelDB through the stateDB. So that the entire tree is stored in the local database.
-finding the encoded account information in the tree according to the root hash in the block, and parsing to obtain the required field.
(3) Block chain data preservation
In the above link, if the block data is finally verified, it is a valid block. BlockChain calls the commit operation of db in m _ state, and writes the cached state into the local database.
And then writing the block data into a local database through the blocksDB.
And finally, writing the information such as the receipt, the latest block number and the like into a local database through the extraDB. The blockchain data is then saved locally.
As shown in fig. 7, after a blockchain receives some inputs in a certain state, it will definitely transition to a new state. Specifically, in an ether house situation, where there is a certain balance and memory on each account, when a set of transactions is received, the balance and memory on the affected accounts may change. From the first creation block, transactions are continually received, thereby enabling a series of new states to be entered.
According to the idea, the block chain packs the transaction data and the verification information in one block at intervals, and the transaction data and the verification information are connected in series in sequence to form a chain. The newer the block, the larger the block number (or called block height).
In the block header (authentication information) of each block, a block header hash value (parenthosh, parent block hash) of the previous block is stored. Such that the blocks in the block chain are linked to each other. If the content of a block in the previous period is changed, the parent block hash of the following block is not matched with the parent block hash, and the block is not recognized by people, so that the non-tamper property of the block chain data is ensured.
Through the above processing, a consumer can query information (including product production information of a manufacturer, logistics information of a logistics party, sales information of a dealer and the like) of an entity product in previous links through the NFT virtual asset, and meanwhile, as the uniqueness of the virtual asset is ensured by the NFT, the NFT can be processed only through a private key of a virtual wallet after the consumer acquires the NFT virtual asset, so that the consumer can own ownership of the NFT virtual asset, including rights of sale, transaction, lease and the like.
The method of the embodiment further includes a processing procedure after the consumer purchases the physical product, as shown in fig. 2.
As shown in fig. 3, in an application, after a consumer purchases an entity product and owns a corresponding NFT virtual asset, the NFT virtual asset may be used for interaction, for example, a user a owning the NFT virtual asset a and a user B owning the NFT virtual asset B perform a block check through an intelligent contract on a block chain, both of them may obtain an upgrade on attributes respectively after the block check, and a winner of the block may also own a newly generated NFT virtual asset C as an NFT virtual asset on the block chain without a corresponding entity product.
In addition, because the data on the blockchain is public, third party companies can directly access the information on the blockchain, reading the information to the NFT virtual assets. For example, a third party company develops a game, and uses the virtual attribute parameters in the NFT virtual asset uniformly, and users a and B can play a battle in the game using the virtual assets a and B, respectively.
And for the winner, applying for the generation of the entity product to produce the entity product corresponding to the virtual asset C through the new virtual attribute parameters in the newly generated NFT virtual asset C.
In another application, users send NFT virtual assets from one wallet address to another, which is a relatively common blockchain technique. Like sending bitcoin peer-to-peer transactions, user a loses ownership of the NFT virtual asset after sending the NFT virtual asset to user B without third party platform authority.
In another application, since the number of NFT virtual assets is limited (which is generated by the manufacturer on the blockchain), the physical product obtained by the user cannot be sold as a genuine product as long as there is no NFT virtual asset on the blockchain even if the appearance of the process material is the same, which is the anti-counterfeiting function of the physical product. And each NFT virtual asset is unique, so that the NFT virtual asset cannot be copied, transfer records of all account purses are clearly checked and cannot be counterfeited by combining the natural record attributes of the block chain, and the circulation link is directly transparent. And as long as some basic values are given to the virtual assets by manufacturers, the power of obtaining extra values by users can be increased, and the risk of illegally obtaining NFT virtual assets by middlemans is reduced.
As mentioned in the background, brand name a first uses the block chain technology to generate 1000 hip hop monkey NFT virtual props (which cannot be copied online, and the generated records are transparent and cannot be tampered with), and then correspondingly puts them on a cup in a two-dimensional code-object-code manner. Other merchants imitate the hip-hop monkey cup by using the same material process, but the hip-hop monkey NFT virtual prop generated by a brand merchant is not on the cup. The user can confirm whether the cup is a real brand-authorized commodity by whether the user can get the hip-hop monkey NFT virtual prop on the cup.
In another application, virtual play value can be realized by using the NFT virtual asset, and due to the unique attribute of the NFT virtual asset, a manufacturer gives play value of the virtual asset to a user in addition to selling the use value of the product, and gives extra virtual value to the product in the real world at low cost, for example, by lottery and formation to synthesize a new NFT virtual asset.
In another application, virtual collection values can also be achieved using NFT virtual assets, with the generated numbering order defining rare attributes and being non-duplicable on the blockchain, unlike storage costs and possible consumption in the real world. Because the NFT virtual property is not copied and increased like original centralized data after being generated in the same batch, a user can really monopolize the property, and the NFT virtual property has a unique visual form and collection value, so that the NFT virtual property can be permanently stored and collected at low cost and only a secret key of a wallet needs to be recorded. But also has the following online interactive market value, similar to the virtual props in the game.
The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A virtual asset handling method based on block chain non-homogenization evidence is characterized by comprising the following steps:
step 1: the block chain receives the input of the entity product information of the entity product in the production link and the corresponding non-homogenization evidence virtual asset matching information;
step 2: automatically creating non-homogeneous evidence-communicated virtual assets on the block chain according to the information input in the step 1;
and step 3: generating unique identification codes of virtual assets and entity products of the non-homogenization certification and placing the unique identification codes on the entity products so that the entity products have double values of real use value and virtual value at the same time;
and 4, step 4: recording production information, logistics information and/or sales information of the physical product by the non-homogeneous evidence-based virtual asset;
and 5: after the entity product is purchased by a consumer, the consumer obtains the non-homogeneous accredited virtual asset through the unique identification code of the corresponding virtual asset so as to have ownership of the non-homogeneous accredited virtual asset.
2. The method of claim 1, wherein the unique identifiers of the virtual assets and the physical products are in one-to-one correspondence, so that the physical products and the virtual assets are in one-to-one correspondence and are associated with each other.
3. The virtual asset handling method based on block chain non-homogenization certification according to claim 1, wherein the production information is provided by a manufacturer through a two-dimensional code of a physical product, the logistics information is provided by a logistics dealer through a two-dimensional code of a physical product, and the sales information is provided by a dealer through a two-dimensional code of a physical product.
4. The method of claim 1, further comprising processing after the consumer purchases the physical product:
after the attributes of the virtual assets are upgraded, a new non-homogeneous certified virtual asset is generated on the block chain without a corresponding entity product, and the corresponding entity product can be produced based on the new non-homogeneous certified virtual asset application.
5. The method of claim 1, further comprising processing after the consumer purchases the physical product:
and judging the entity product corresponding to the virtual asset without the non-homogenization evidence as a fake product.
6. The method of claim 1, further comprising processing after the consumer purchases the physical product:
non-homogenous certified virtual assets are permanently stored and collected.
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Cited By (12)
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| CN113935840A (en) * | 2021-10-29 | 2022-01-14 | 智己汽车科技有限公司 | Method and apparatus for establishing associations of virtual and real vehicles in a blockchain network |
| CN113987538A (en) * | 2021-10-29 | 2022-01-28 | 上海对外经贸大学 | Block chain decomposition combined NFT-based infrastructure |
| CN114065269A (en) * | 2022-01-14 | 2022-02-18 | 北京大学深圳研究生院 | Method for generating and analyzing bindless heterogeneous token and storage medium |
| CN114266864A (en) * | 2022-03-02 | 2022-04-01 | 杭州华鲤智能科技有限公司 | Method for storing true state change of real object |
| CN114266576A (en) * | 2022-02-28 | 2022-04-01 | 环球数科集团有限公司 | Transaction system for metauniverse digital assets |
| CN114399320A (en) * | 2022-03-24 | 2022-04-26 | 北京理工大学 | Bill supply chain anti-counterfeiting traceability system and method based on block chain NFT |
| CN114493774A (en) * | 2022-01-19 | 2022-05-13 | 浙江毫微米科技有限公司 | Leasing method and device based on block chain, electronic equipment and storage medium |
| CN114581104A (en) * | 2022-03-03 | 2022-06-03 | 武汉权信技术有限公司 | Anti-counterfeiting and right-confirming method and device based on block chain NFT technology |
| CN114998013A (en) * | 2022-06-01 | 2022-09-02 | 湖南天河文链科技有限公司 | NFT-based digital collection transaction method and system |
| TWI818679B (en) * | 2022-08-17 | 2023-10-11 | 台灣大哥大股份有限公司 | Non-fungible token login verification system and method |
| WO2023233393A1 (en) * | 2022-05-30 | 2023-12-07 | Kornit Digital Ltd. | Using smart contracts to control automatic distribution of production instructions |
| CN118350831A (en) * | 2024-04-24 | 2024-07-16 | 浙江理工大学 | Agricultural product tracing method based on Ethernet ERC721 protocol |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113987538A (en) * | 2021-10-29 | 2022-01-28 | 上海对外经贸大学 | Block chain decomposition combined NFT-based infrastructure |
| CN113935840A (en) * | 2021-10-29 | 2022-01-14 | 智己汽车科技有限公司 | Method and apparatus for establishing associations of virtual and real vehicles in a blockchain network |
| CN113935840B (en) * | 2021-10-29 | 2024-07-09 | 智己汽车科技有限公司 | Method and apparatus for establishing association of virtual and real vehicles in a blockchain network |
| CN114065269A (en) * | 2022-01-14 | 2022-02-18 | 北京大学深圳研究生院 | Method for generating and analyzing bindless heterogeneous token and storage medium |
| CN114493774A (en) * | 2022-01-19 | 2022-05-13 | 浙江毫微米科技有限公司 | Leasing method and device based on block chain, electronic equipment and storage medium |
| CN114266576A (en) * | 2022-02-28 | 2022-04-01 | 环球数科集团有限公司 | Transaction system for metauniverse digital assets |
| CN114266864A (en) * | 2022-03-02 | 2022-04-01 | 杭州华鲤智能科技有限公司 | Method for storing true state change of real object |
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| CN114581104A (en) * | 2022-03-03 | 2022-06-03 | 武汉权信技术有限公司 | Anti-counterfeiting and right-confirming method and device based on block chain NFT technology |
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| WO2023233393A1 (en) * | 2022-05-30 | 2023-12-07 | Kornit Digital Ltd. | Using smart contracts to control automatic distribution of production instructions |
| CN114998013A (en) * | 2022-06-01 | 2022-09-02 | 湖南天河文链科技有限公司 | NFT-based digital collection transaction method and system |
| TWI818679B (en) * | 2022-08-17 | 2023-10-11 | 台灣大哥大股份有限公司 | Non-fungible token login verification system and method |
| CN118350831A (en) * | 2024-04-24 | 2024-07-16 | 浙江理工大学 | Agricultural product tracing method based on Ethernet ERC721 protocol |
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