Systems and methods are described for provisioning access credentials to a mobile device using device and authorization codes. Once provisioned, a mobile device can be used to conduct a transaction.

Described herein is a system in which an electronic record is stored on a distributed environment with respect to an item. In this system, transactions may be conducted for an item in an anonymous fashion. In some embodiments, a first user may input an item identifier associated with an item as well as an indication of an action to be performed with respect to that item. The identifier may be transmitted to a blockchain network, which may use that identifier to locate a blockchain associated with the item. A blockchain may include a series of transaction records associated with the item, each of which is signed using a private key. Upon performance of the indicated action, the blockchain network may generate a new transaction record, append that transaction record to the blockchain, and sign the transaction record.

One or more embodiments of the present specification provide blockchain-based remittance methods and apparatuses. One method comprising: receiving, from an account of a remitter, a transaction for a remittance to an account of a remittee, wherein the transaction comprises a remittance amount of the remittance and at least one reserved amount corresponding to the remittance amount allocated by the remitter from a reserve fund list to the transaction; performing verification of the transaction, wherein the verification comprises determining whether a total amount of the at least one reserved amount comprised in the transaction is greater than or equal to the remittance amount; and in response to determining that the verification is successful: deducting the remittance amount from the balance of the account of the remitter, and adding the remittance amount to a balance of the account of the remittee.

Alternative service access with operations including determining that a system has met a plurality of criteria, including the system having a battery level below a threshold, identifying a merchant, generating an authentication token for authorizing a payment using a payment provider, and sending the authentication token to the payment provider.

Embodiments of the present specification provide methods and apparatuses for generating two-dimensional codes. One method comprising: receiving, by a secure element chip comprised in a two-dimensional code display device, code information comprising an account identifier of an account associated with the two-dimensional code display device; in response to obtaining a digital certificate for a private key stored in the secure element chip, signing, by the security element chip, the code information by using the private key to generate signed code information; and providing, the signed code information to the two-dimensional code display device for the two-dimensional code display device to generate and display a two-dimensional code based on the code information, wherein the two-dimensional code comprises information associated with the account identifier and changes dynamically over time.

Systems and methods for identity verification to provide access to restricted goods or services. A first device may receive, from a second device operated on behalf of a user, a first request to purchase a restricted good or service. The first device may transmit, to the second device responsive to the first request, a second request comprising an identification of information of the user, and an identification of validation system; and may receive the requested information of the user. The first device may generate an attestation key comprising a hash of the requested information of the user and the identification of the validation system; and may determine that a record in a centralized or distributed ledger at an address corresponding to the attestation key is associated with a non-zero transaction value. Responsive to the determination, the first device may provide the restricted good or service to the user.

A system and method for processing a transaction are provided. In a method conducted at a server computer associated with an issuer, a transaction request is received via a secure communication channel from a communication device. The transaction request relates to a transaction with a merchant which a consumer intends to conduct using the consumer device. The secure communication channel is established with the communication device. The consumer is authenticated by the issuer over the secure communication channel. The transaction request includes at least a transaction reference or transaction details. A cryptogram which is based on the transaction details and information in association with the consumer which is stored based on the transaction details and information associated with the consumer, which is stored at the server, is obtained and provided to the merchant for use in processing the transaction.

There is provided an information processing apparatus, an information processing method, a program, and an information processing system that are able to reduce a processing time for reading while ensuring security regarding data reading. The information processing apparatus includes a processing unit that, in a case where a reading request including a data reading command and information indicating a region of a recording medium from which data is read is acquired, encrypts data corresponding to the region indicated by the reading request by using an encryption key corresponding to the region indicated by the reading request and transmits the encrypted data.

A method for consensus verification implementable by a first blockchain node in a consensus network may comprise: receiving a transaction request from a client, and performing a first security verification on the transaction request; in response to determining that the transaction request passes the first security verification, storing the transaction request, and broadcasting the transaction request to each of second blockchain nodes in the consensus network, causing the each second blockchain node to store the transaction request in response to the second blockchain node determining that the transaction request passes a second security verification; performing pre-processing on at least one stored transaction request in response to determining that a preset condition is satisfied, to obtain and store a pre-processed block; and broadcasting the obtained pre-processed block to the second blockchain nodes, causing the second blockchain nodes to perform consensus verification on the obtained pre-processed block.

Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media, for protecting sensitive data of a transaction activity based on a smart contract in a blockchain. One of the methods includes: receiving activity data for creating an account for the transaction activity from a user, the activity data including at least an identifier of the smart contract in the blockchain and an expiration time of the transaction activity; sending the activity data to an authentication server for requesting a digital certificate of the activity data, wherein the digital certificate stores the identifier of the smart contract, and an expiration time of the digital certificate is set to be the expiration time of the transaction activity; and causing the account for the transaction activity to be created after to receiving the digital certificate from the authentication server.