WO2020082873A1

WO2020082873A1 - Object selection method and device and electronic device

Info

Publication number: WO2020082873A1
Application number: PCT/CN2019/101681
Authority: WO
Inventors: 谢桂鲁
Original assignee: 阿里巴巴集团控股有限公司
Priority date: 2018-10-25
Filing date: 2019-08-21
Publication date: 2020-04-30
Also published as: CN109615370A; TW202016827A

Abstract

Provided in one or more embodiments of the present description are an object selection method and device and an electronic device, which are applied to a blockchain node. The method comprises: invoking an intelligent contract used to select an object, the intelligent contract being used to generate a random seed according to seed data provided by a candidate object, and generating a pseudo-random number on the basis of the random seed by means of a pseudo-random number generator such that a candidate object matching the pseudo-random number is selected to be a target object.

Description

Object selection method and device, electronic equipment

Technical field

One or more embodiments of this specification relate to the field of blockchain technology, and in particular, to an object selection method and apparatus, and electronic equipment.

Background technique

When an event is set to be implemented by a preset number of objects, if the number of candidate objects exceeds the preset number, you need to select from these candidate objects. When there is no obvious difference between these candidate objects for the implementation of the event, the preset number of objects can be randomly selected from these candidate objects. For example, when the system contains 10 devices, if you want to configure an architecture with 2 master devices and 8 slave devices, you can randomly select 2 master devices from the 10 devices, and the remaining 8 devices are slave devices. .

Summary of the invention

In view of this, one or more embodiments of this specification provide an object selection method and apparatus, and electronic equipment.

To achieve the above purpose, one or more embodiments of this specification provide technical solutions as follows:

According to a first aspect of one or more embodiments of this specification, an object selection method is proposed, which is applied to blockchain nodes; the method includes:

Invoke a smart contract for selecting an object. The smart contract is used to generate a random seed based on the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, so as to match The candidate object of the pseudo-random number is selected as the target object.

According to a second aspect of one or more embodiments of this specification, an object selection device is proposed for use in a blockchain node; the device includes:

The calling unit calls a smart contract for selecting an object, and the smart contract is used to generate a random seed according to the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, so that The candidate object matching the pseudo-random number is selected as the target object.

According to a third aspect of one or more embodiments of this specification, an electronic device is provided, including:

processor;

Memory for storing processor executable instructions;

Wherein, the processor executes the executable instruction to implement the method as described in any one of the above embodiments.

BRIEF DESCRIPTION

FIG. 1 is a flowchart of an object selection method provided by an exemplary embodiment.

Fig. 2 is a schematic diagram of a real estate purchased by a number sign provided by an exemplary embodiment.

FIG. 3 is a schematic diagram of a signing process based on a smart contract provided by an exemplary embodiment.

FIG. 4 is a schematic structural diagram of a device provided by an exemplary embodiment.

FIG. 5 is a block diagram of an object selection device provided by an exemplary embodiment.

detailed description

Exemplary embodiments will be described in detail here, examples of which are shown in the drawings. When the following description refers to the accompanying drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of this specification. Rather, they are merely examples of devices and methods consistent with some aspects of one or more embodiments of this specification, as detailed in the appended claims.

It should be noted that in other embodiments, the steps of the corresponding method are not necessarily performed in the order shown and described in this specification. In some other embodiments, the method may include more or fewer steps than described in this specification. In addition, the single step described in this specification may be decomposed into multiple steps for description in other embodiments; and the multiple steps described in this specification may also be combined into a single step in other embodiments description.

FIG. 1 is a flowchart of an object selection method provided by an exemplary embodiment. As shown in Figure 1, this method is applied to blockchain nodes and can include the following steps:

Step 102: Invoke a smart contract for selecting an object. The smart contract is used to generate a random seed according to the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, so that The candidate object matching the pseudo-random number is selected as the target object.

In an embodiment, since the random seed is generated based on the seed data provided by the candidate object, the random seed has a truly high randomness, which cannot be predicted and set by criminals, making the pseudo-random generated based on the random seed The numbers also have a high degree of randomness, thus preventing fraudulent fraud and cheating. At the same time, because the generation process of random seeds and pseudo-random numbers are both implemented by smart contracts, and the smart contract is stored in the blockchain, the content of the smart contract is open and cannot be tampered, which makes the choice of the target object The process is fair, open and verifiable, which further reduces the possibility of fraudulent fraud.

In one embodiment, the smart contract is used to update the random seed according to a preset algorithm after receiving the seed data provided by the candidate object. The initial value of the random seed may be a preset initial value; or, after receiving the first seed data provided by the candidate object, the first seed data may be used as the initial value of the random seed. When the random seed is Z1, if the seed data 1 provided by the candidate is received, the random seed Z1 and the seed data 1 can be calculated based on a preset algorithm, so that the random seed is updated to Z2; further, if received For the seed data 2 provided by the candidate object, the random seed Z2 and the seed data 2 can be calculated based on a preset algorithm, so that the random seed is updated to Z3 until all the seed data provided by the candidate object participates in the random seed Update processing.

In an embodiment, the smart contract is used to splice all the seed data after receiving all the seed data provided by the candidate object, and implement and splice the initial value of the random seed according to a preset algorithm Data related update processing; wherein, the initial value of the random seed is a preset initial value. For example, a smart contract can describe a time period for receiving seed data, so that the seed data provided by the candidate object within the time period can be used to update the random seed, then the smart contract is before the end time of the time period , The seed data provided by the candidate will not be processed, but after the termination time is reached, all the seed data received within the time period will be spliced, and the spliced seed data will be used to update the random seed For example, the initial values of the spliced seed data and the random seed are calculated according to a preset algorithm, so as to obtain the updated random seed.

In an embodiment, the preset initial value of the random seed may include any one of the following: the time stamp when the assignment operation is performed (that is, the moment when the preset initial value needs to be assigned to the random seed), the history area in the blockchain The hash value of the block (such as the most recently generated block in the blockchain), the specified transaction in the historical block in the blockchain (such as the a transaction arranged by transaction time, a is the default value) Hash value.

In an embodiment, the above-mentioned preset algorithm may include a message digest algorithm, which may calculate a hash value of a random seed and seed data as an updated random seed. Of course, the preset algorithm may also include other types of algorithms, which are not limited in this specification.

In an embodiment, the value of the random seed is also related to the reception timestamp of the seed data, so that the value of the random seed is affected by both the seed data and the reception timestamp, which can be further increased after the random seed is updated The randomness of the target, so as to improve the fairness when selecting the target object, and avoid the fraud and cheating of the criminals.

In an embodiment, the candidate object may be provided with multiple candidate pseudo-random number generators supported by the smart contract to be selected by the candidate user, which may further reflect fairness and openness, and Increased randomness. For example, a variety of pseudo-random number generators can be defined in the smart contract in advance, and the candidate object can also submit selection information for the pseudo-random number generator while providing seed data, so that the smart contract can count each candidate The selection information of the object determines the number of selected times corresponding to each pseudo-random number generator, thereby arranging the number of selected times in a preset rank (eg, the number of selected times is ranked first, the number of selected times is ranked third, or any other rank) The pseudo-random number generator is used to generate pseudo-random numbers.

In one embodiment, the smart contract is also used to: deposit the seed data and / or the random seed in the blockchain, so that the alternative user or regulator can always seed the blockchain Check the data and random seeds to ensure that there is no fraud or fraud in the update process of random seeds, or discover possible fraud and cheating in a timely manner.

In an embodiment, the smart contract is also used to: store the pseudo-random number in the blockchain, so that the alternative user or supervisor can always check the pseudo-random number and pseudo-random number from the blockchain. The relationship between the generator and the random seed is verified to ensure that there is no fraud or cheating in the process of generating pseudo-random numbers, or that possible fraud and cheating are discovered in time.

In an embodiment, the smart contract is also used to: verify the qualification registration information of any object, and after the verification is passed, store the qualification information of the any object in the blockchain, so that all The any object becomes the candidate object; wherein, the qualification registration information includes the public key of the any object, and the qualification registration information is signed by the private key of the any object. By verifying the qualification registration information, you can ensure that all candidates meet the preset requirements. Because the qualification registration information is signed by the private key, the identity information of each object is clear and traceable, avoiding dark box operations.

In an embodiment, the seed data is signed by the candidate object through a private key; the smart contract is also used to: perform signature verification on the received seed data to ensure that the seed data provided by the candidate object is not Will be tampered with by criminals.

In an embodiment, the number of candidate objects is multiple, and the smart contract may select some objects from these candidate objects as a preset number of target objects, and the preset number may be one or more.

In an embodiment, the candidate objects may include any type of objects, depending on the applied scenario, and this specification does not limit this. For example, when dispatching a taxi task to a taxi, the candidate object may be a taxi license plate number, which is used to randomly assign a taxi for each taxi task; for example, when configuring a device system composed of multiple electronic devices At this time, the candidate object may be a device ID, which is used to select a specified number of electronic devices as the master device.

In an embodiment, each candidate object may have a corresponding unique number, for example, the unique number may be the sort number of the candidate object, etc., which is not limited in this specification. By comparing the pseudo-random number generated based on the random seed with the unique number corresponding to each candidate object, the same unique number as the pseudo-random number can be determined, so that the candidate object corresponding to the unique number is selected as the target object. Of course, the pseudo-random number and the candidate object can also be matched in other ways to determine the selected target object.

In an embodiment, the smart contract also sends a notification message to the off-chain system, where the notification message includes information of the target object to instruct the off-chain system to grant preset permissions to the target object, so that The target object can perform related operations, and other candidate objects not selected as the target object do not have the preset authority and cannot perform related operations.

For example, for areas where the number of vehicles needs to be controlled, the off-chain system may include a vehicle license plate management system, and the preset authority includes the authority to select a vehicle license plate, and the candidate object is a user who wishes to select a vehicle license plate; then, the target The object can select the vehicle license plate, and the alternative objects that have not been selected as the target object cannot select the vehicle license plate, thereby realizing the control of the number of vehicles. For another example, for areas where a house purchase is required, the off-chain system includes a real estate management system, and the preset authority includes the purchasing authority for real estate. The candidate object is a user who wants to purchase real estate of a certain building; then, When the number of alternative objects exceeds the total number of real estate of the real estate, the target object can be selected based on the total real estate, so that the target object can purchase real estate of the real estate, and the alternative objects not selected as the target object cannot be purchased The real estate of the building.

For ease of understanding, the following describes the object selection scheme in this manual by taking the signing process when purchasing real estate as an example. FIG. 2 is a schematic diagram of a real estate purchase provided by an exemplary embodiment; as shown in FIG. 2, assuming that user A wishes to participate in the real deal for a real estate, the user A can enter registration through the mobile phone 21 with the client installed Qualification registration information required for the qualification of the number, such as identification documents, deposit certification materials, public keys corresponding to digital identities, personal data, etc. (this depends on the requirements of the property developer or relevant laws and regulations). Similarly, if user B wishes to participate in the number dialing, he can enter the qualification registration required for registering the number dialing qualification through the mobile phone 22 on which the client is installed. The situation of other users will not be repeated here.

The device 23 is configured as a server of the number-signing system. The device 23 interacts with the mobile phones 21-22 used by users A-B, etc., to assist them in registering the number-signing qualification, and interacts with the device 24 on the other hand. The device 24 is configured as a blockchain node in the blockchain. Based on the information provided by the device 23, a smart contract can be configured and issued, and the smart contract can be invoked to realize the registration of the qualification and the number operation. The real estate developer or the number notarization department can configure the smart contract to set the registration conditions for the number qualification and the stages included in the number shaking process (such as dividing the stages based on time or dividing the stages based on the block height on the blockchain Etc.), the processing logic adopted at each stage, etc., so that the smart contract can be used to implement the object selection scheme of this specification to complete the corresponding number-sharing operation.

Assuming that the configuration process of the smart contract has been completed, and the smart contract has been released into the blockchain, then based on the smart contract, the number-sharing process shown in FIG. 3 can be implemented. The process can include the following steps:

In step 301, the user registers for the qualification to dial the number.

In an embodiment, taking the above user A as an example, the user A may submit the qualification registration information to the device 23 through the mobile phone 21, and submit a transaction containing the qualification registration information to the blockchain via the device 24. The type can be configured or marked as the type of registered lottery qualification. Similarly, other users can also register for the lottery qualification in the above manner.

In addition to submitting transactions containing qualification registration information to the blockchain through device 24, user A can also submit transactions containing qualification registration information to the blockchain through other blockchain nodes, for example, the mobile phone 21 can be configured as a zone Blockchain node, then user A can submit a transaction containing qualification registration information to the blockchain based on the mobile phone 21.

The above-mentioned transactions containing qualification registration information can be recorded in the blockchain ledger, and smart contracts can be queried and accessed from the blockchain ledger to obtain the qualification registration information contained in these transactions, thereby verifying whether the corresponding user can obtain Qualification for the lottery.

In an embodiment, taking the device 24 as an example, the device 24 can learn information such as the name or location of the smart contract, so that the device 24 can directly send the qualification registration information to the smart contract, and the smart contract can register the received qualification information Perform verification to determine whether the corresponding user can qualify for the lottery.

Step 302, the smart contract verifies the user information.

In an embodiment, after the smart contract obtains the qualification registration information of a certain user, it can verify the qualification registration information according to the predefined registration conditions to determine whether it meets the registration conditions; if it is met, the corresponding user is determined Have the qualification to shake the number, otherwise it is judged as not qualified to shake the number.

In one embodiment, the qualification registration information contains the public key and other personal information of the corresponding user, and the qualification registration information should be signed by the user's private key to ensure that the content is true and valid and cannot be tampered with.

Step 303, the smart contract submits the verification result to the blockchain to deposit the certificate in the blockchain ledger.

In one embodiment, by storing the verification results in the blockchain ledger, the verification results are transparent and traceable, and the verification results cannot be tampered with at will, ensuring the verification of the qualification registration information meets the requirements and avoiding dark box operations.

Step 304, the smart contract generates a qualification number for the authenticated user, and submits the allocation information of the qualification number to the blockchain to deposit the certificate in the blockchain ledger.

In an embodiment, the smart contract may generate the qualification number in a preset manner, such as sorting according to the value of the public key, the morning and evening of the reception time of the qualification registration information, etc., and using the sequence number as the corresponding qualification number. Of course, the qualification number can also be generated in other ways, and this specification does not limit this.

In an embodiment, if the qualification number is generated according to the value of the public key, the smart contract needs to wait for receiving the qualification registration information submitted by all users before it can obtain the public key of each user, so as to generate for all users who pass the verification Qualification number.

In one embodiment, if the qualification number is generated according to the moment of receipt of the qualification registration information, the smart contract may generate the qualification number for the corresponding user after each piece of qualification registration information is received.

In an embodiment, assuming that each stage is divided by time period, the smart contract may define the start time and the end time of the user registration phase, then the smart contract is only for the qualification registration received between the start time and the end time The information undergoes qualification verification and generates a qualification number, and the qualification registration information received outside the user registration stage is judged to be invalid.

In one embodiment, by depositing the qualification numbers corresponding to all users involved in the lottery in the blockchain ledger, the qualification numbers of each user are open, transparent, queryable, and cannot be tampered. Therefore, in the subsequent lottery process, Based on the qualification number, it can be accurately determined whether each user is shaken, with extremely high fairness, openness and credibility.

Step 305, the user submits seed data.

Similar to step 301, user A can send the seed data to the device 23 through the mobile phone 21 and publish the seed data to the blockchain via the device 24, so that the smart contract can obtain the seed data from the blockchain ledger; or When the mobile phone 21 is configured as a blockchain node, the mobile phone 21 can publish the seed data set by the user A to the blockchain, and the smart contract can obtain the seed data from the blockchain ledger; or, the device 24 Seed data can be sent directly to smart contracts. I will not repeat them here.

In one embodiment, the seed data can be any content provided by the user. In fact, it is precisely because the content of the seed data is random and uncontrollable that when the random seed is updated based on the seed data, the randomness of the content of the random seed is increased, so that the update result of the random seed is not easy to be manipulated, avoiding borrowing This process of manipulating the sign.

Step 306, after acquiring the seed data, the smart contract implements signature verification.

In an embodiment, the smart contract can read the signature information of the received seed data; if the seed data is not signed, the smart contract cannot determine the source of the seed data, and it can be determined that the signature verification failed; if the seed data is signed If it does not belong to the user who passed the verification in step 302, the smart contract can determine that the source of the seed data is illegal, and it can be determined that the signature verification failed; if the signature of the seed data belongs to the user who passed the verification in step 302, the smart contract can It is further determined whether the seed data is received for the first time in the number shaking process. If it is not the first time it is received, it can be determined that it has not passed verification, and if it is received for the first time, it can be determined that it has passed signature verification.

Therefore, the user signs the seed data through the private key held by the user, which is convenient for confirming the source of the seed data, and can avoid the repeated use of the seed data; at the same time, by signing the seed data, the criminal data can be avoided by criminals Perform tampering to prevent manipulation of the updated results of random seeds.

Step 307, the smart contract updates the random seed based on the seed data, and submits the seed data to the blockchain to store the certificate in the blockchain ledger.

In an embodiment, the seed data and the random seed can be calculated based on a preset hash algorithm, and the random seed can be updated with the calculated value to obtain the updated random seed. For example, the hash algorithm may include SHA256, etc. This specification does not limit this. By applying the seed data to update the random seed, and the seed data is provided by the users participating in the lottery, it has great randomness, so that the random seed can produce random, unpredictable changes, which can avoid the criminals The value of the random seed is manipulated.

In an embodiment, when assigning a value to a random seed, a time stamp of the current time may be selected, and the hash value of the time stamp may be set as the initial value of the random seed. Of course, the initial value of the random seed can also be set in other ways, which is not limited in this specification.

In an embodiment, steps 305 to 307 correspond to the seed generation stage, and the start time and end time of the seed generation stage can be defined in the smart contract to divide and define the seed generation stage. In the time period between the start time and the end time, each user who is qualified to shake can provide seed data. For example, user 1 to user n provide corresponding seed data 1 to seed data n, then the smart contract Can be handled as:

In one case, the smart contract updates the random seed whenever it receives a seed data, until all the seed data is applied to update the random seed. For example, the random seed is initially Z1; when seed data 1 is received, Z1 and seed data 1 can be hashed, and the hash value obtained is updated to a random seed Z2; further, when the seed is received After data 2, you can hash Z2 and seed data 2 and update the hash value to random seed Z3; ... When you receive seed data n, you can hash Zn and seed data n And update the obtained hash value to a random seed Zn + 1, which is taken as the final value.

In another case, the smart contract can obtain all the seed data received during the seed generation stage, such as seed data 1 to seed data n, and after splicing these seed data, the post-splicing seed data is obtained; then, the smart contract The spliced seed data and the initial value of the random seed can be hashed to obtain the updated random seed.

In one embodiment, the smart contract can store the received seed data in the blockchain ledger, and the seed data contains the signature of the corresponding user, which can verify the source of the seed data and prevent tampering with the seed data. Further, the smart contract can also store each seed data in the blockchain ledger in association with the corresponding pre-update random seed and post-update random seed, so that users or regulators can check and prevent it from tampering with criminals. .

In step 308, the smart contract generates a winning number according to the random seed, and publishes the winning number to the blockchain to deposit the certificate in the blockchain ledger.

In an embodiment, a pseudo-random number generator is defined in the smart contract, and a corresponding pseudo-random number can be generated by inputting a random seed and a value range to the pseudo-random number generator. Among them, the input random seed may be the final value obtained after updating the seed data. The final value of the random seed is affected by the seed data, so that the criminals cannot predict or manipulate, so that the pseudo-random number has true random characteristics At the same time, the input value range can be the value range of the qualification number generated in the above step, so the generated pseudo-random number is the winning number, and can hit a certain qualification number, so that the user corresponding to the qualification number can get the real estate selection Purchase rights.

In one embodiment, by depositing the winning number on the blockchain ledger, users or supervisors can conduct verification and verification at any time to avoid tampering by criminals. Taking user A as an example, user A can initiate a query request to device 23 through mobile phone 21, device 23 can query the blockchain ledger through device 24, and return the result of the query to the mobile phone 21 for viewing by user A , To ensure that you have the right to purchase real estate; similarly, when user A has an objection to the number shaking process, the same process can also be used to retrospectively query the relevant data in the blockchain ledger, the entire process and the data it generates Both are open and transparent.

FIG. 4 is a schematic structural diagram of a device provided by an exemplary embodiment. Please refer to FIG. 4. At the hardware level, the device includes a processor 402, an internal bus 404, a network interface 406, a memory 408, and a non-volatile memory 410. Of course, it may include hardware required for other services. The processor 402 reads the corresponding computer program from the non-volatile memory 410 into the memory 408 and then runs it to form an object selection device at a logical level. Of course, in addition to the software implementation, one or more embodiments of this specification do not exclude other implementations, such as logic devices or a combination of hardware and software, etc., that is to say, the execution body of the following processing flow is not limited to each The logic unit may also be a hardware or logic device.

Please refer to FIG. 5. In the software implementation, the object selection device is applied to the blockchain node; the device may include:

The calling unit 51 calls a smart contract for selecting an object, the smart contract is used to generate a random seed according to the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, to The candidate object matching the pseudo-random number is selected as the target object.

Optionally, the smart contract is used to perform update processing related to the seed data on the random seed according to a preset algorithm after each time the seed data provided by the candidate object is received; wherein, the random seed The initial value of is the preset initial value or the first seed data provided by the candidate object.

Optionally, the smart contract is used to splice all the seed data after receiving all the seed data provided by the candidate object, and implement the initial value of the random seed according to a preset algorithm to be related to the spliced data Update processing; wherein, the initial value of the random seed is a preset initial value.

Optionally, the preset initial value includes any of the following: the time stamp when the assignment operation is performed, the hash value of the historical block in the blockchain, the specified transaction in the historical block in the blockchain Hash value.

Optionally, the value of the random seed is also related to the reception timestamp of the seed data.

Optional, also includes:

The providing unit 52 provides multiple candidate pseudo-random number generators supported by the smart contract to the candidate object for selection by the candidate user.

Optionally, the smart contract is also used to: deposit the seed data and / or the random seed in the blockchain.

Optionally, the smart contract is also used to: deposit the pseudo-random number in the blockchain.

Optionally, the smart contract is also used to verify the qualification registration information of any object, and after the verification is passed, the qualification information of the any object is stored in the blockchain to enable the task An object becomes the candidate object; wherein, the qualification registration information includes the public key of the any object, and the qualification registration information is signed by the private key of the any object.

Optionally, the seed data is signed by the candidate object through a private key; the smart contract is also used to: perform signature verification on the received seed data.

The system, device, module or unit explained in the above embodiments may be specifically implemented by a computer chip or entity, or implemented by a product with a certain function. A typical implementation device is a computer, and the specific form of the computer may be a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email sending and receiving device, and a game control Desk, tablet computer, wearable device, or any combination of these devices.

In a typical configuration, the computer includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

The memory may include non-permanent memory, random access memory (RAM) and / or non-volatile memory in computer-readable media, such as read only memory (ROM) or flash memory (flash RAM). Memory is an example of computer-readable media.

Computer-readable media, including permanent and non-permanent, removable and non-removable media, can store information by any method or technology. The information may be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, read-only compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, Magnetic cassette tapes, magnetic disk storage, quantum memory, graphene-based storage media or other magnetic storage devices or any other non-transmission media can be used to store information that can be accessed by computing devices. According to the definition in this article, computer-readable media does not include temporary computer-readable media (transitory media), such as modulated data signals and carrier waves.

It should also be noted that the terms "include", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device that includes a series of elements not only includes those elements, but also includes Other elements not explicitly listed, or include elements inherent to such processes, methods, goods, or equipment. Without more restrictions, the element defined by the sentence "include one ..." does not exclude that there are other identical elements in the process, method, commodity, or equipment that includes the element.

The foregoing describes specific embodiments of the present specification. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the particular order shown or sequential order to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

The terminology used in one or more embodiments of this specification is for the purpose of describing particular embodiments only, and is not intended to limit one or more embodiments of this specification. The singular forms "a", "said" and "the" used in one or more embodiments of the present specification and the appended claims are also intended to include the majority forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more associated listed items.

It should be understood that although one or more embodiments in this specification may use the terms first, second, third, etc. to describe various information, the information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first information may also be referred to as second information, and similarly, the second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "when" or "in response to a determination".

The above are only preferred embodiments of one or more embodiments of this specification, and are not intended to limit one or more embodiments of this specification. Anything within the spirit and principle of one or more embodiments of this specification, Any modifications, equivalent replacements, improvements, etc., should be included within the scope of protection of one or more embodiments of this specification.

Claims

An object selection method applied to blockchain nodes; the method includes:

Invoke a smart contract for selecting an object. The smart contract is used to generate a random seed based on the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, so as to match The candidate object of the pseudo-random number is selected as the target object.
The method according to claim 1, wherein the smart contract is used to perform update processing related to the seed data on the random seed according to a preset algorithm after receiving the seed data provided by the candidate object each time; The initial value of the random seed is a preset initial value or the first seed data provided by the candidate object.
The method according to claim 1, the smart contract is used to splice all seed data after receiving all the seed data provided by the candidate object, and implement the initial value of the random seed according to a preset algorithm Update processing related to the data after splicing; wherein the initial value of the random seed is a preset initial value.
The method according to claim 2 or 3, wherein the preset initial value includes any one of the following: a time stamp when performing an assignment operation, a hash value of a historical block in the blockchain, and a history in the blockchain The hash value of the specified transaction in the block.
The method according to claim 1, the value of the random seed is further related to a time stamp of reception of the seed data.
The method of claim 1, further comprising:

A plurality of candidate pseudo-random number generators supported by the smart contract are provided to the candidate object for selection by the candidate user.
According to the method of claim 1, the smart contract is further used to: deposit the seed data and / or the random seed in a blockchain.
According to the method of claim 1, the smart contract is further used to deposit the pseudo-random number in the blockchain.
According to the method of claim 1, the smart contract is further used to verify the qualification registration information of any object, and store the qualification information of any object in the blockchain after the verification is passed, To make the any object become the candidate object; wherein the qualification registration information includes the public key of the any object, and the qualification registration information is signed by the private key of the any object.
The method according to claim 9, wherein the seed data is signed by the candidate object through a private key; the smart contract is further used to: perform signature verification on the received seed data.
An object selection device applied to blockchain nodes; the device includes:

The calling unit calls a smart contract for selecting an object, and the smart contract is used to generate a random seed according to the seed data provided by the candidate object, and generate a pseudo-random number based on the random seed through a pseudo-random number generator, so that The candidate object matching the pseudo-random number is selected as the target object.
The apparatus according to claim 11, wherein the smart contract is used to perform update processing related to the seed data on the random seed according to a preset algorithm after each time the seed data provided by the candidate object is received; The initial value of the random seed is a preset initial value or the first seed data provided by the candidate object.
The apparatus according to claim 11, the smart contract is used to splice all seed data after receiving all the seed data provided by the candidate object, and implement the initial value of the random seed according to a preset algorithm Update processing related to the data after splicing; wherein the initial value of the random seed is a preset initial value.
The device according to claim 12 or 13, the preset initial value includes any one of the following: a time stamp when performing an assignment operation, a hash value of a historical block in the blockchain, and a history in the blockchain The hash value of the specified transaction in the block.
The apparatus according to claim 11, the value of the random seed is further related to a reception time stamp of the seed data.
The apparatus according to claim 11, further comprising:

The providing unit provides multiple candidate pseudo-random number generators supported by the smart contract to the candidate object for selection by the candidate user.
The apparatus according to claim 11, the smart contract is further used to: deposit the seed data and / or the random seed in a blockchain.
According to the apparatus of claim 11, the smart contract is further used to store the pseudo-random number in the blockchain.
According to the apparatus of claim 11, the smart contract is further used to verify the qualification registration information of any object, and store the qualification information of the any object in the blockchain after the verification is passed, To make the any object become the candidate object; wherein the qualification registration information includes the public key of the any object, and the qualification registration information is signed by the private key of the any object.
The apparatus according to claim 19, the seed data is signed by the candidate object through a private key; the smart contract is further used to: perform signature verification on the received seed data.
An electronic device, including:

processor;

Memory for storing processor executable instructions;

Wherein, the processor executes the executable instruction to implement the method according to any one of claims 1-10.