Abstract: Blockchain-based service data encryption methods and apparatuses are provided wherein by a first derived key is obtained by a node device of a key receiver, the first derived key distributed by a node device of a key distributor, wherein the first derived key is derived from a derived key of the key distributor based on a service data permission type of the key receiver and service data is encrypted based on the first derived key to obtain encrypted service data. The encrypted service data is sent to a blockchain, so that the encrypted service data is recorded in a distributed database of the blockchain after the blockchain performs consensus verification on the encrypted service. Because the derived key of the key distributor can decrypt the service data encrypted by the first derived key, the key distributor can decrypt, monitor, and manage service data uploaded by the key receiver.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage devices, for data processing and storage. One of the methods includes maintaining, by a storage system, a data log file in a source storage device of the storage system. The storage system identifies one or more characteristics of the data log file and one or more characteristics of the source storage device, and determines a migration metric of the data log file based on the one or more characteristics of the data log file and the one or more characteristics of the source storage device. The storage system determines whether to migrate the data log file according to the migration metric. In response to determining to migrate the data log file, the storage system migrates the data log file from a source location in the source storage device to a destination storage device.

Abstract: Implementations of data security technologies are disclosed. In an implementation, a plurality of feature points of a user-selected image are determined. A first plurality of interactive operations performed on at least a portion of the plurality of feature points by a user are detected during lock screen passcode set up of a mobile computing device. The first plurality of interactive operations are stored. The user-selected image is displayed on a lock screen when the mobile computing device is in a locked state. A second plurality of interactive operations on a touchscreen of the mobile computing device are detected when the mobile computing device is in the locked state, and the mobile computing device is unlocked if the second plurality of interactive operations match the first plurality of interactive operations.

Abstract: An information sending method is provided. The method includes determining, by the apparatus, an interaction setting between a first terminal device and a second terminal device; determining a service index of the first terminal device based on the interaction setting between the first terminal device and the second terminal device; determining information to send based on the service index; and sending the determined information to the first terminal device.

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: A method includes generating, by a computing device, a unique identifier (ID) based on copyright information associated with digital content, wherein the copyright information and the digital content are recorded on a blockchain of a blockchain network; identifying a plurality of color values associated with one or more color attributes of at least a portion of the digital content; and embedding the unique ID in the digital content by changing one or more color values of the plurality of color values to be representative of the unique ID, wherein the embedding produces information-embedded digital content that enables retrieval of the copyright information from the blockchain based on the unique ID, and wherein a visual difference between the digital content and the information-embedded digital content is not apparent to an unaided human eye.

Abstract: A method for setting a device identifier comprises: obtaining a first APP (Application) list of a target device; performing matching between the first APP list and a second APP list to determine a number of identical APPs in both the first APP list and the second APP list; determining whether the determined number of identical APPs reaches a pre-set threshold; and when the determined number of identical APPs reaches the pre-set threshold, setting a device identifier corresponding to the second APP list as the target device's device identifier.

Abstract: An implementation of the present specification discloses a method for processing payment in an offline scenario. A collection terminal, when in an offline state, scans an offline code generated by a user terminal in an offline state to obtain offline code information, obtains a payment amount, and saves the offline code information and the payment amount, and if in an online state, uploads the offline code information and the payment amount to a server, so that after receiving the offline code and the payment amount, the server pays a deduction amount from a corresponding payment account based on the offline code information and the payment amount, and thus puts the deduction amount into a payment account corresponding to the collection terminal. As such, the payment function can still be achieved when the user terminal and the collection terminal are in an offline state.

Abstract: A data writing request is received at a web browser from a first application, where the data writing request comprises data and address information of a web page into which the data is written, and where the web browser and the first application are associated with a mobile device. The data writing request is sent to a web server. An instruction message is received from the web server and the data is stored at a shared storage space on the mobile device based on the instruction message. A data access request is received from a second application, where the web browser and the second application are associated with the mobile device. The data is read from the shared storage space based on the access request and sent to the second application.

Abstract: Embodiments of the present application relate to a method, apparatus, and system for verifying an identity of a user. The method includes receiving a preset key that is associated with a key carrier that is a physical object, storing the preset key in a database storing mappings between a plurality of preset keys and a plurality of users, receiving a verification key in connection with an identity verification of a user, retrieving the preset key associated with the user from the database, determining whether the verification key matches the preset key associated with the user, and causing a determination of whether the key carrier is authentic.

Abstract: A method for dynamically evaluating a resource value is described. Data encoding one or more parameters related to the resource value is accessed, where the one or more parameters are monitored by a plurality of sensors that form an Internet of Things (IoT) and then released by the IoT of the plurality of sensors on a blockchain network. At least one parameter from the data is compared with a predetermined threshold value or a predetermined threshold range. In response to determining that the at least one parameter has exceeded the predetermined threshold value or the predetermined threshold range, a calculation of the resource value is triggered according to evaluation logic described by a smart contract released on the blockchain network in association with the one or more parameters being monitored, such that a consensus is reached on the blockchain network regarding the resource value that has been calculated.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for retrieving data from external data sources for processing within a blockchain network. One of the methods includes receiving a request for data that includes encrypted data, the encrypted data including access data that is encrypted using a service public key of a key management node; selecting a relay system node from a plurality of relay system nodes that share a service private key of the key management node; transmitting the request to the relay system node; receiving a response provided from the relay system node, the response including result data and a digital signature, wherein the digital signature is generated based on the result data and the service private key of the key management node; and transmitting the response to a client.

Abstract: Multiple geographic grids are generated according to acquired location information of a service provider. Each geographic grid contains one or more service providers. The second region matching the target location information is a geographic grid for a region defined by the target location information. A presentation request for a search page is received. The presentation request includes target location information. A keyword is acquired that has a search popularity meeting a first condition in a first region matching the target location information, and the acquired keyword is used as a first keyword. The first keyword is provided for presentation in the search page.

Abstract: Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for authenticating a user based on passive affective and knowledge-based authentication (AKBA). In one aspect, a method includes data associated with eye movements and ocular dynamics of the user are captured with a camera as the user looks at a graphical user interface (GUI) of a device; an AKBA signature of the user is determined based on the captured data; the user is authenticated based on a comparison of the AKBA signature with an AKBA template associated with the user; and an access to a subset of functions of an application is granted.

Abstract: Blockchain-based exchange method and apparatus for available resource quotas are disclosed. An example of method comprises: selecting, by a management node of a blockchain network, a set of object nodes as a target object according to a selection rule; determining, by the management node for each object node in the target object, a resource quota; determining, by the management node for the each object node, virtual resources corresponding to the resource quota as virtual resource decrements corresponding to the object node; and constructing, by the management node, a quota exchange transaction comprising the determined virtual resource decrements corresponding to the object node, and adding the quota exchange transaction to a blockchain on the blockchain network.

Abstract: Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for communicating and sharing blockchain data. One of the methods includes sending current state information associated with a current block of a blockchain to one or more shared storage nodes of the blockchain network; sending a hash value to the one of the one or more shared storage nodes for retrieving an account state stored in the historic state tree; receiving the account state in response to sending the hash value; and verifying, by the consensus node, that the account state is part of the blockchain based on the hash value.