Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for processing guarantee information. One of the methods includes receiving an application of a guarantee made by at least a guarantor to a beneficiary; generating a digital version of the guarantee based on the information included in the application; encrypting the digital version to generate cyphertext of the guarantee; generating one or more zero-knowledge proofs (ZKPs) related to one or more values associated with the guarantee; and sending the cyphertext and the one or more ZKPs to a blockchain network to store the cyphertext on a blockchain, wherein the cyphertext is stored on the blockchain through consensus of blockchain nodes of the blockchain network after the one or more ZKPs are successfully verified by the blockchain nodes.

Abstract: A computer-implemented blockchain-based transaction obfuscation method includes: determining a submission time based on a base time and a submission time interval; determining that no actual transaction information is obtained between the base time and the submission time during the submission time interval; generating false transaction information; cryptographically encoding transaction content in the false transaction information; and subsequent to the submission time, submitting the false transaction information to a blockchain to obfuscate a number of actual transactions in the blockchain.

Abstract: One or more embodiments of the present specification provide blockchain-based transaction methods, apparatuses, and electronic devices. A target transaction sent by a node device of a transaction initiator is received. An account of the transaction initiator corresponds to a plurality of public keys, and the target transaction includes transaction content and a digital signature. The digital signature is created by using one or more private keys corresponding to the plurality of public keys of the account and is created based on at least a part of the transaction content. The target transaction is verified, including verifying whether the digital signature is valid. In response to a successful verification, the target transaction is recorded to a distributed database of a blockchain based on a consensus rule of the blockchain.

Abstract: Disclosed are methods and systems for retrieving data based on a plurality of blockchain networks. One method comprises: receiving a first-type transaction hash sent by a user, wherein the first-type transaction hash is a hash value of a first-type blockchain transaction associated with a first-type blockchain network, wherein the first-type blockchain network and the second-type blockchain network are comprised in a data recording system; identifying a second-type blockchain transaction that comprises the first-type transaction hash; identifying a network identifier from the second-type blockchain transaction; identifying a first-type blockchain transaction corresponding to the first-type transaction hash from a blockchain of a first-type blockchain network corresponding to the network identifier; and providing the first-type blockchain transaction to the user.

Abstract: Methods, systems, and apparatus for blockchain-based data sharing. An example method includes determining, at a data requester node of an index blockchain network that maintains index information sets shared by a plurality of data provider nodes of the index blockchain, target index information set that corresponds to target data recorded in the index blockchain network, wherein the target index information set comprises a ciphertext index of the target data and member information of a target data provider node of the target data; initiating, at the data requester node, a data acquisition request to the target data provider node by using a sharing platform of the index blockchain network, wherein the data acquisition request comprises the ciphertext index of the target data; and receiving, at the data requester node and from the sharing platform, response data that is encrypted by using an identity public key of the target data requester node.

Abstract: Parking lots can provide parking services to users for fees, and the user needs to pay a corresponding amount of fees to the parking lot based on parking duration of a vehicle in a parking environment. Parking information of a vehicle in a parking environment can be detected by using an IoT device associated with the parking fee collection system; parking fee payment information of the vehicle is determined when the parking information indicates that the vehicle exits the parking environment; and when the parking fee payment information indicates that fee payment for the vehicle is uncompleted, an overdue fee record related to the vehicle is published to a blockchain network by using a first blockchain node corresponding to the parking fee collection system in the blockchain network.

Abstract: A display device and a terminal device are disclosed. The display device includes a main body and a cover body rotatably connected to the main body, the main body includes a first display screen on a side, close to the cover body, of the main body, the cover body is provided with an accommodating cavity penetrating through the cover body in a direction perpendicular to the first display screen, the cover body includes a second display screen in the accommodating cavity, the second display screen is stacked on the first display screen in the direction perpendicular to the first display screen, and the second display screen is a transparent display screen.

Abstract: Methods and devices utilizing artificial intelligence (AI) or machine learning (ML) for customization of a device specific air interface configuration in a wireless communication network are provided. An over the air information exchange to facilitate the training of one or more AI/ML modules involves the exchange of AI/ML capability information identifying whether a device supports AI/ML for optimization of the air interface.

Abstract: Implementations of this specification include identifying a plurality of transactions to be executed in the blockchain, wherein the transactions are arranged in an execution order, wherein the transactions include one or more smart contract calls to smart contracts each having a whitelist identifying one or more accounts that are authorized to execute the smart contract, and wherein the execution order includes a smart contract call to a smart contract that does not have a whitelist arranged after the plurality of transactions; identifying groups of transactions within the plurality of transactions; instructing nodes of the blockchain network to execute each of the groups of transactions in parallel; determining that the nodes of the blockchain network have completed executing all of the groups of transactions; and in response, instructing the nodes of the blockchain network to execute the smart contract call that does not include a whitelist.

Abstract: The present disclosure provides a light-emitting layer, an organic light emitting diode (OLED) device, and a display apparatus. The light-emitting layer has a host material containing a first photocrosslinker group. A guest material containing a second photocrosslinker group is prepared. The host material and the guest material are mixed in a solvent to form a mixture. The mixture is coated, annealed, and LV-irradiated on a substrate to form the light-emitting layer. As such, the disclosed light-emitting layer is prepared by the polymerization after being on the substrate. The light-emitting layer has a mesh structure. The mesh structure improves energy transfer between the host material and guest material and increases the lifespan of the resultant OLED device and OLED display apparatus.

Abstract: According to one aspect of the present disclosure, there is provided an apparatus that includes a battery, a Direct Current (DC) bus connected to the battery, and a DC to DC converter connected to the battery in parallel with the DC bus. A Motor Control Unit (MCU) is connected between the DC to DC converter and an electric motor. An Alternating Current (AC) port is connected to the electric motor. Switches connect the DC bus and an output of the DC to DC converter in series as an input to the MCU in a drive mode and disconnect the DC bus from the MCU in a charge mode.

Abstract: One or more implementations of the present specification relate to blockchain-based cross-chain data access methods and apparatuses, and electronic devices. An access request that is specific to target data and that is sent by a node device is obtained. The target data is stored in a target blockchain of a multi-chain system that comprises a plurality of blockchains. The access request comprises an access path of the target data. The target blockchain that the target data is located in is determined based on the access path of the target data. A corresponding data access driver configured for the target blockchain is determined based on the access path of the target data. The data access driver is invoked to parse the access request and to access the target data.

Abstract: Embodiments of Merkle tree construction methods and apparatuses are disclosed. One method comprises: for each transaction storage location in a target block of a blockchain, retrieving, by a full node in a blockchain network, data from the respective transaction storage location; analyzing the data retrieved from each transaction storage location; determining whether the data retrieved from the respective transaction storage location is a transaction or concealed data; in response to determining that the data retrieved is a transaction, performing a hash operation on the transaction to obtain a transaction hash; and in response to determining that the data retrieved is concealed data, extracting a transaction hash from the concealed data.

Abstract: An organic light-emitting diode (OLED) display panel is provided. The OLED display panel includes touch sensors, pressure sensors and fingerprint recognition sensors integrated in the OLED display panel. The touch sensors are distributed entirely over an effective display area of the OLED display panel, the pressure sensors are distributed near a rim of the effective display area, and the fingerprint recognition sensors are distributed at a lower portion of the effective display area. An operating method of the OLED display panel is also provided. The OLED display panel and the operating method thereof provide a product integrating three technologies, namely, touch, pressure sensing, and fingerprint recognition, in one piece.

Abstract: One or more embodiments of the present specification provide blockchain-based data processing computer-implemented methods, non-transitory, computer-readable media, and computer-implemented systems. In an implementation, a computer-implemented method includes obtaining, by a first node device of a blockchain and from a distributed database of the blockchain, a target transaction that comprises state information of a target user. A data type of the state information and data content that corresponds to the data type of the state information is identified. A first graphical processing is performed on the data content that corresponds to the data type of the state information to obtain a state graphic that corresponds to the target user, where the first graphical processing is performed based on first predetermined data graphical processing logic that corresponds to the data type of the state information.

Abstract: Embodiments of the present disclosure provide an intelligent driving control method and device, and a storage medium, wherein the method comprises: detecting a traffic signal of a vehicle travelling environment to obtain a detection result of the traffic signal; acquiring a current travelling state of a vehicle and a vehicle default state corresponding to the detection result of the traffic signal; determining whether the current travelling state of the vehicle matches the vehicle default state; and in response to the current travelling state of the vehicle not matching the vehicle default state, outputting a driving alarm signal and/or a control signal for instructing the vehicle to switch from a current state to the vehicle default state.

Abstract: An array substrate includes a substrate, a dual-gate oxide thin film transistor TFT, an electrode for display and a polycrystalline silicon TFT. The dual-gate oxide thin film transistor TFT and the electrode for display are located in a sub-pixel on the substrate, and a drain electrode of the dual-gate oxide TFT is electrically connected to the electrode for display.

Abstract: A smart toothbrush control circuit, a smart toothbrush, and a smart tooth-brushing behavior monitoring method are provided. The smart toothbrush control circuit includes: a main control module, a brush head module, a position detection module, and a pressure detection module. The main control module is connected to a cloud server by a smart terminal. The main control module uploads oral data to the cloud server so as to implement deep-level data analysis and processing on the oral data. The main control module generates a control signal according to the oral data, and the brush head module, the position detection module and the pressure detection module send a variety of behavior guidance and prompts to a user on the basis of the control signal. The smart terminal synchronously display a tooth-brushing behavior of the user on the basis of the control signal.

Abstract: This disclosure relates to data encryption and decryption. In one aspect, a method includes receiving, by a second peer end computing device, first data from a first peer end computing device. The second end computing device generates a random term based on a result range pre-agreed upon with the first peer end computing device. The result range includes a minimum result value and a maximum result value. The random term is a product of a random number and an agreed upon constant. The agreed upon constant is greater than a difference between the maximum result value and the minimum result value. The second peer end computing device performs a homomorphic operation based on the first data, local private second data, and the random term to obtain an encryption result. The second peer end computing device returns the encryption result to the first peer end computing device.

Abstract: Methods, a system, apparatuses, and devices for processing a request in a consortium blockchain are disclosed. One method comprises: receiving a first request comprising a service location query request or a simple payment verification (SPV) request; determining whether the client device is associated with a user of the blockchain node or other blockchain nodes in the consortium blockchain network; in response to determining that the client device is associated with a user of the other blockchain nodes, determining a first quantity of requests from users of the other blockchain nodes that the blockchain node that has processed, and a second quantity of requests from users of the other blockchain nodes have processed; and processing the first request based on the first quantity and the second quantity to generate a processing result.