Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for liveness detection are provided. One of methods includes: displaying an image to a user, and capturing a face image of the user while displaying the image to the user; determining an eye image of an eye of the user based on the face image; extracting a to-be-verified image from the eye image of the user, wherein the to-be-verified image is reflection of the displayed image in the eye of the user; comparing the displayed image with the to-be-verified image to determine whether the to-be-verified image matches the displayed image; and performing liveness detection on the user based on a result of comparison.

Abstract: A method for identifying a certification includes: determining a target verification mode for verifying a certificate, wherein the target verification mode comprises one or more pieces of movement information of movements performed by a designated body part with respect to the certificate, and the one or more pieces of movement information include information of holding the certificate in one or more designated holding postures; obtaining one or more images of the certificate; verifying whether a first image of the one or more images of the certificate comprises the designated body part; in response to that the first image comprises the designated body part, analyzing, whether the first image comprises the one or more pieces of movement information to generate an analysis result; and determining, based on the analysis result, whether the certificate is a forged certificate.

Abstract: A method includes: setting at least two service domains each having a service domain identifier; configuring, based on parameter information of each of the at least two service domains, at least two storage resources corresponding to the at least two service domains; receiving a data storage request including to-be-stored data and a service domain identifier for the to-be-stored data; determining, according to the service domain identifier of the to-be-stored data, a target storage resource corresponding to the to-be-stored data from the at least two storage resources; storing the to-be-stored data to the target storage resource; receiving a data reading request carrying the service domain identifier; in response to receiving the data reading request, reading, based on the service domain identifier, the data stored at the target storage resource; and transmitting the data read from the target storage resource to a requester that sends the data reading request.

Abstract: An order processing method comprises: obtaining, by a third party payment institution, an order that is paid but not successfully delivered; and initiating, by the third party payment institution, a refund operation for the order.

Abstract: The specification discloses a system and a method for realizing identity identification based on a radio frequency identification technology. The system comprises: a radio frequency detector on the ground and configured to detect radio frequency tags and send, when a radio frequency tag is detected, information carried in the radio frequency tag to a controller; a camera configured to collect a face image and send the collected face image to the controller; and the controller, configured to: determine, according to the information, a first identification of a user corresponding to the radio frequency tag, determine, according to the face image, a second identification of the user, and control a turnstile to allow the user to pass through when the first identification of the user and the second identification of the user match.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for a blockchain-based image processing are provided. One of the methods comprises: displaying, by a terminal device, a target image; obtaining, by the terminal device, information of a copyright owner of the target image and a current display environment of the target image; sending, by the terminal device, the obtained information to one or more blockchain nodes configured to obtain ciphertext information by encrypting the obtained information and to store the ciphertext information in a blockchain; obtaining, by the terminal device, the ciphertext information from the blockchain; and updating, by the terminal device, historical information in a pixel matrix of the target image based on the ciphertext information.

Abstract: Methods, apparatuses, and devices, including computer programs encoded on computer storage media for displaying webpage content are provided. One of the methods includes: receiving an access request of a first user to access a webpage; determining webpage content according to the access request of the first user; determining a second user identifier comprised in the webpage content based on the webpage content; determining a presentation identifier from one or more presentation identifiers corresponding to the second user according to the determined second user identifier and the webpage content, wherein the one or more presentation identifiers are configured to identify the corresponding second user; and returning the webpage content to the first user, wherein the webpage content comprises the determined presentation identifier corresponding to the determined second user identifier.

Abstract: A method for processing payment complaint includes receiving, from a user terminal, a complaint query request of a user; querying, in response to the complaint query request, a transaction database according to user information of the user to acquire at least one target payment card corresponding to the payment complaint of the user; generating, according to the user information and the at least one target payment card, complaint voucher information of the user and returning to the user terminal the complaint voucher information; receiving a complaint creation request from the user terminal, wherein the complaint creation request is created by the user terminal based on the complaint voucher information; and creating, in response to the complaint creation request, a corresponding complaint task of the user.

Abstract: A method includes: obtaining a signal strength sequence of signals detected by a user terminal during a travel route. The detected signals are originated from signal sources disposed at different locations in the travel route, and the different location includes one or more vehicles or one or more stops. The method further includes: extracting, from the signal strength sequence, a first sequence fragment corresponding to a signal transmitted by a signal source disposed at a vehicle; determining a travel time duration of the user riding on the vehicle according to a signal strength value and time stamp information of the first sequence fragment.

Abstract: A method for blockchain-based data verification is provided. The method includes: obtaining target data submitted by a data submitter, wherein a first data digest of the target data is recorded in a blockchain; computing a second data digest of the target data; determining whether the second data digest matches the first data digest of the target data recorded in the blockchain; and determining that the target data submitted by the data submitter is valid in response to determining that the second data digest matches the first data digest of the target data recorded in the blockchain.

Abstract: A computer-implemented method, non-transitory, computer-readable medium, and computer-implemented system is provided for obtaining a real-name electronic bill. In response to an association operation initiated by a user for a target electronic bill, an association transaction is published that includes an identifier of the target electronic bill, where the association transaction causes a network node on the blockchain to return identity association prompt information when determining that the target electronic bill stored in the blockchain is not associated with user identity information (UII). The UII is collected when receiving the identity association prompt information. The UII is sent to the network node, where the network node verifies whether the UII matches identity information of a payment user in the target electronic bill, and after verification succeeds, publishes an association relationship between the UII and the identifier of the target electronic bill to the blockchain for storage.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for implementing blockchain contracts are provided. One of the methods includes: obtaining bytecode of a blockchain contract, wherein the bytecode comprises an indicator indicating a type of the blockchain contract; determining a virtual machine corresponding to the type based at least on the indicator; and triggering the determined virtual machine to execute the blockchain contract.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based decentralized-identifier creation, are provided. One of the methods includes: obtaining a request for creating a decentralized identifier (DID), wherein the request comprises a public key of a cryptographic key pair; creating, based on the public key, a blockchain account associated with a blockchain; creating the DID based on information associated with the blockchain account; and returning a confirmation message comprising the created DID.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based cross-entity authentication are provided. One of the methods includes: obtaining an authentication request by a first entity for authenticating a user, wherein the authentication request comprises a decentralized identifier (DID) of the user; in response to determining that the first entity is permitted to access authentication information of the user endorsed by a second entity, generating a blockchain transaction for obtaining an authentication result of the user by the second entity, wherein the authentication result is associated with the DID; and transmitting the blockchain transaction to a blockchain node for adding to a blockchain.

Abstract: Embodiments of this specification provide a method and apparatus for quick enabling a service in an application program and an electronic device. When a user terminal receives tag content transmitted by a near field communication (NFC) tag, an operating system of the user terminal may enable an application program that has registered NFC. Then, the enabled application program uploads the tag content to a server. According to a service routed by the server after the server decodes the tag content, the application program executes the routed service.

Abstract: This application provides a method and a device for determining an area of interest based on geolocation data. The method includes: dividing an area on a map into a plurality of blocks; for each block in the area, determining the number of terminals within the block in a duration as a value of the block in the duration; determining a plurality of anchor points based on the blocks having values greater than a threshold; and obtaining a curve based on some or all of the anchor points, wherein an area bounded by the curve is an area of interest.

Abstract: A machine learning model training method includes: classifying samples having risk labels in a training sample set as positive samples and classifying samples without risk labels in the training sample set as negative samples; training a risk model with a machine learning method based on the positive samples and the negative samples; obtaining a risk score for each of the negative samples based on the trained risk model; identifying one or more negative samples in the training sample set that have a risk score greater than a preset threshold value; re-classifying the one or more negative samples in the training sample set that have a risk score greater than the preset threshold value as re-classified positive samples to generate an updated training sample set from the training sample set; and re-training the risk model with the machine learning method based on the updated training sample set.

Abstract: A method includes: obtaining an image of a graphic code from a scanning device that scans the graphic code displayed on a user terminal of a user; extracting, from the image of the graphic code, graphic code information encoded in the graphic code; verifying signature information in the graphic code information, wherein the graphic code information comprises the signature information, at least one piece of identity information of the user, and service permission information of multiple services; determining whether the at least one piece of identity information of the user matches identity information accepted by a service provider corresponding to the scanning device; determining whether the service permission information of multiple services of the graphic code information matches service permission information of a service supported by the scanning device; and executing the service.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for executing blockchain contracts are provided. One of the methods includes: obtaining a bytecode of a blockchain contract, wherein the bytecode comprises one or more indicators, and the one or more indicators comprise a first indicator indicating a virtual machine type for executing the blockchain contract; and executing the blockchain contract using a virtual machine of the virtual machine type associated with the first indicator.

Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for blockchain-based file querying are provided. One of the methods includes: receiving a query request for a target file, the query request comprising identification information of a user and the target file; obtaining the target file based on the identification information of the user and the target file; providing a query page of the target file, the query page comprising interactive elements for selecting whether to upload the target file to a blockchain; receiving a user selecting to upload the target file to the blockchain; hashing the target file to generate a digital digest; signing the digital digest according to an asymmetric encryption algorithm using a private key associated with a cryptographic key pair to obtain a digital signature; and uploading the target file, the digital signature, and a public key associated with the cryptographic key pair.