Abstract: Techniques for invocating a smart contract are described. One example method includes receiving a target transaction that is used to initiate an invocation of a smart contract, wherein the target transaction comprises invocation data, and wherein the invocation data comprises a data digest associated with target data stored in a third-party storage system interconnected with a blockchain; querying the target data from the third-party storage system; receiving a query result returned by the third-party storage system, wherein the query result comprises the target data; performing a content verification on the target data; determining that the content verification on the target data succeeds; invoking the smart contract to perform a smart contract computation on the invocation data included in the target transaction; and storing a computation result from the smart contract computation in a distributed database associated with the blockchain after the smart contract computation is completed.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for consensus system downtime recovery. One of the methods includes: obtaining a pre-prepare message from the primary node; multicasting a prepare message indicating an acceptance of the pre-prepare message to at least some of the primary node and the other (N?2) backup nodes; obtaining (Q?1) or more prepare messages respectively from (Q?1) or more of the backup nodes; storing the pre-prepare message and the (Q?1) or more prepare messages; multicasting a commit message to at least some of the primary node and the other backup nodes, the commit message indicating that the one backup node agrees to the (Q?1) or more prepare messages; and obtaining, respectively from Q or more nodes among the primary node and the backup nodes, Q or more commit messages each indicating that the corresponding node agrees to (Q?1) or more prepare messages.

Abstract: In an implementation, one or more user interactions from a virtual reality (VR) device user for initiating a service in a VR scenario of a VR application are detected. One or more eye physiological characteristics of the VR device user are obtained for user identity authentication. The obtained one or more eye physiological characteristics are compared with one or more pre-stored eye physiological characteristics samples. The VR device user is authenticated if the one or more eye physiological characteristics match at least a portion of the one or more pre-stored eye physiological characteristics samples, and a server that provides and performs the service is communicated with.

Abstract: In an implementation of identifying related computing devices for automatic user account login, a login request to a user account that includes a unique identification (ID) of a user computing device and an internet protocol (IP) address of the user computing device are received. One or more user computing devices that have logged in to the user account using a same IP address as the user computing device are identified based on a user ID of the user account and the unique ID of the user computing device. Whether one or more unique IDs corresponding to the one or more user computing devices that have logged in to the user account are correlated with the unique ID of the user computing device is determined. If yes, data corresponding to login information used by the one or more user computing devices to log in to the user account to the user computing device for automatic account login are sent.

Abstract: Computer-implemented methods, non-transitory, computer-readable media, and computer-implemented systems for generating proof of payment. One computer-implemented method includes: verifying user information of a plurality of users of a service on a terminal device, wherein the service starts from a start location and ends at an end location, the user information comprises a quantity of the plurality of users, the plurality of users comprise an owner of a service account associated with the service to be paid for by using the terminal device and at least one companion selected by the owner; and in response to the user information of at least the owner is verified, generating at least one proof of payment based on the user information and account information of the service account, wherein the at least one proof of payment is verified at the start location and the end location.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for toll fee charging. One of the computer-implemented methods includes obtaining information of a vehicle traveling on a toll road, where the vehicle is associated with a user account on a payment platform. For the vehicle and to a blockchain, recording a travel history by using a blockchain node corresponding to the tolling system in a blockchain network, where the travel history comprises a distance the vehicle is driven on the toll road. In response to determining that the distance the vehicle is driven reaches a predetermined distance, charging a toll fee using the payment platform.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media, for acquiring and recording tracking information on a blockchain. One of the methods includes: verifying, by a terminal device, an identity of a user who is to submit transaction data for recordation on the blockchain; acquiring, by the terminal device, tracking information to be submitted with the transaction data for recordation on the blockchain, the tracking information including identity information of the user and a location of the terminal device; generating, by the terminal device, a data package including the tracking information and the transaction data; and submitting, by the terminal device, the data package for recordation on the blockchain.

Abstract: Technology described herein includes a method that includes receiving, at one or more processing devices, data corresponding to a first image, and determining, by the one or more processing devices based on the received data, that a first set of pixel values of the first image corresponds to illumination of a first representative wavelength, and at least a second set of pixel values of the first image corresponds to illumination of a second representative wavelength. The illuminations of the first and second representative wavelengths constitute at least a portion of a first illumination sequence pattern used in capturing the first image. The method also includes determining that the first illumination sequence pattern matches a second illumination sequence pattern associated with a device from which the first image is expected to be received, and in response, initiating a biometric authentication process for authenticating a subject represented in the first image.

Abstract: Techniques for providing a service execution method and device are described. A request is received from a browser of a client device. A web page is determined from the received request. The web page is transmitted to the client device to wake up a designated application of the client device. A service execution request is received from the designated application of the client device. The received service execution request is determined to correspond to the received request. In response to determining that the received service execution request corresponds to the received request, a service is executed based on the received service execution request.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for identifying a narrow-strip two-dimensional bar code. One of the methods includes obtaining an image of the narrow-strip two-dimensional bar code. A first positioning graph and a second positioning graph are detected in the image. A target region is determined from the image based on center positions of the first positioning graph and the second positioning graph, where the target region includes a rectangular region corresponding to the narrow-strip two-dimensional bar code. A data region is determined from the target region, and two-dimensional bar code data is determined from the data region.

Abstract: Behavior data associated with a user is obtained. The behavior data is generated when the user uses an Internet service and includes a user identification and identification information indicating the Internet service. At least one predefined carbon-saving quantity quantization algorithm is determined based on the identification information related to the Internet service. A carbon-saving quantity associated with the user is calculated based on the obtained behavior data and the determined at least one predefined carbon-saving quantity quantization algorithm. Based on the calculated carbon-saving quantity associated with the user and the user identification, user data is processed. The user data is related to the carbon-saving quantity associated with the user.

Abstract: Disclosed in the embodiments of the present application are method and apparatus for identifying damaged part of vehicle, server, client and system. The method comprises: pre-establishing identifiable vehicle feature library including vehicle parts and feature correspondence library including relative positional relationships of these parts. During the loss assessment image capturing procedure, the user manually delineates the damage location on the client. The identifiable vehicle features in the image can be identified by the server, the relative positions of the identifiable features and the mark delineated by user are determined according to these identifiable features.

Abstract: Disclosed herein are computer-implemented methods; computer-implemented systems; and non-transitory, computer-readable media, for sending cross-chain messages. One computer-implemented method includes storing, through consensus of blockchain nodes of a first blockchain network, an authenticable message (AM) associated with a first account to a blockchain associated with the first blockchain network, where the AM comprises an identifier of the first blockchain network, information of the first account, information of a recipient of the AM, and content of the AM. The AM and location information is transmitted to a relay to be forwarded to the recipient located outside of the first blockchain network, where the location information identifies a location of the AM in the blockchain and the recipient includes one or more accounts outside of the first blockchain network.

Abstract: A method for implementing blockchain-based transactions comprises: determining a transaction amount to be remitted from a blockchain account of a remitter into a blockchain account of a receiver, wherein the blockchain account of the remitter records a homomorphic encryption ciphertext of the remitter's balance, the blockchain account of the receiver records a homomorphic encryption ciphertext of the receiver's balance; generating a homomorphic encryption ciphertext of the transaction amount with respect to the remitter and a homomorphic encryption ciphertext of the transaction amount with respect to the receiver; and submitting to the blockchain a transaction for the homomorphic encryption ciphertext of the transaction amount with respect to the remitter to be subtracted from the homomorphic encryption ciphertext of the remitter's balance and for the homomorphic encryption ciphertext of the transaction amount with respect to the receiver to be added to the homomorphic encryption ciphertext of the receiver's

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain network digital ticket transfer. One of the methods includes receiving a request from a client device to transfer a digital ticket from a blockchain network to a target server by a blockchain network node. The blockchain network node determines whether the client device is authorized to transfer the digital ticket based on a digital signature in the request, and transmits a notification message to the target server if the digital signature is valid. The blockchain network node receives a confirmation message from the target server indicating validity of the client device, and transfers the digital ticket to the target server.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media, for providing transaction data to a blockchain system for processing. One of the methods includes: monitoring the transaction data in a computer system, wherein the transaction data include at least one of single-transaction data or multiple-transaction data; and based on the monitoring, asynchronously uploading the transaction data to the blockchain system.

Abstract: A computer-implemented information protection method comprises: obtaining a plurality of encrypted transaction amounts associated with transactions among a plurality of accounts, wherein each of the encrypted transaction amounts is associated with one of the accounts that sends or receives one of the transaction amounts, and the encryption of each of the transaction amounts at least conceals whether the one account sends or receives the one of the transaction amounts; generating a sum proof based on the obtained encrypted transaction amounts, the sum proof at least indicating that the transaction amounts are balanced; and transmitting the encrypted transaction amounts and the sum proof to one or more nodes on a blockchain network for the nodes to verify the transactions.

Abstract: Technologies related to mobile credit payment are disclosed. In an implementation, a first SNEP Get Request Message is generated and sent to a mobile computing device, in response to a NFC signal received from the mobile computing device. A first SNEP Response Message is received from the mobile computing device and parsed to identify an APP public key license. A pre-stored credit authorization public key is used to verify the APP public key license and an APP public key is retrieved from the APP public key license if the verification is successful. A second SNEP Get Request Message is sent to the mobile computing device and a second SNEP Response Message is received from the mobile computing device. The APP public key is then used to decrypt the second SNEP Response Message, and a transaction log is recorded if the second SNEP Response Message is successfully decrypted.

Abstract: Examples of a method and apparatus for cross-chain resource transmission are described. The cross-chain resource transmission includes sending from a first account of a first blockchain to another blockchain. One example of the method is executed by the first blockchain and includes: initiating, by the first account, a first transaction used for cross-chain resource transmission, to decrement a first resource balance of the first account by a first quantity and save first data obtained through a consensus into the first blockchain based on execution of the first transaction, where the first data includes an authenticable message; and sending the first data and first location information to the relay end, which is used to send the authenticable message to the second blockchain, where a second resource balance of the second account is incremented by a second quantity.

Abstract: Disclosed herein are computer-implemented methods; computer-implemented systems; and non-transitory, computer-readable media, for sending cross-chain messages. One computer-implemented method includes storing an authenticable message (AM) associated with a first account to a blockchain associated with the first blockchain network, where the AM is generated based on a protocol stack comprising an outer-layer protocol, a middle-layer protocol, and an inner-layer protocol, the outer-layer protocol comprises an identifier (ID) of an originating blockchain network and the middle-layer protocol, the middle-layer protocol comprises information of the sending account and the inner-layer protocol, the inner-layer protocol comprises an ID of a destination blockchain network, information of a receiving account associated with the destination blockchain network, and message content.