The present invention provides a multi-chain concurrent transaction method, including the following steps. The cross-chain transaction information sent by a user through a user terminal is received; the cross-chain transaction information is distributed to the accounting node and the consensus node of the corresponding main chain or sub-chain according to the payer address of the cross-chain transaction information, so that the accounting node of each main chain or sub-chain performs multi-chain concurrent transaction, so that the main chain or sub-chain does not occupy a large amount of bandwidth while obtaining cross-chain transaction information, and the performance of the blockchain network is guaranteed.

A blockchain-based rough gemstone planning method including scanning rough gemstones and generating one rough gemstone records, recording the rough gemstone record to a rough gemstone blockchain network, receiving a smart contract associated for each rough gemstone record, receiving virtual derivative gemstone records, generating derivative smart contracts for the virtual derivative gemstone records, sending the virtual derivative gemstone records and the derivative smart contracts to a trading network, and receiving price information associated with the virtual derivative gemstone records.

Application information is received by a client and from a server, and the application information includes an application identifier corresponding to a digital certificate application request transmitted by the client to the server. The application information is delivered to a secure element associated with the client by the client. A public and private key pair are generated by the secure element. The application identifier is signed using the private key to generate terminal signature data. Specified format data is generated by encapsulating the terminal signature data and the public key into the specified format data. The specified format data is transmitted from the secure element to the client. The specified format data is transmitted by the client to the server.

Application information is received by a client and from a server, and the application information includes an application identifier corresponding to a digital certificate application request transmitted by the client to the server. The application information is delivered to a secure element associated with the client by the client. A public and private key pair are generated by the secure element. The application identifier is signed using the private key to generate terminal signature data. Specified format data is generated by encapsulating the terminal signature data and the public key into the specified format data. The specified format data is transmitted from the secure element to the client. The specified format data is transmitted by the client to the server.

Implementations of the present specification disclose blockchain data processing methods, apparatuses, devices, and systems, including a computer-implemented method for blockchain data processing. Blockchain transaction data of a plurality of transaction participants is received. Each of the plurality of transaction participants provides a respective certificate indicating a respective legal membership in a blockchain. The respective legal membership enables processing of the blockchain transaction data. A mutual identity querying is performed to confirm whether each of the plurality of transaction participants has the respective legal membership in the blockchain. Supervision keys of a supervision node in the blockchain are determined, where the supervision node corresponds to a supervisor, and where the supervision keys are dynamically updated based on a predetermined rule. The blockchain transaction data is encrypted by using the supervision keys. The blockchain transaction data is stored.

Aspects of the present disclosure involve systems, methods, devices, and the like for generating dynamic machine readable codes. In one embodiment, a system is introduced that enables the analysis of user information for the generation of the dynamic machine readable code. In response to the analysis, using middleware on a multi-tier system, user information is embedded onto the dynamic machine readable code. The embedded user information can be captured during the transaction enabling the presentation of customized content which can be used to provide a user friendly interface for the transacting while detecting incorrect account usage. In another embodiment, in conjunction with the dynamic machine readable code, additional user and/or device features are captured during the processing of a transaction such that the combination facilitate fraudulent activity detection.

A secure token defines use-based access restrictions to a first user resource. The secure token is delegated to a second user. The second user redeems the secure token for access to the first user's resource. The access during redemption is constrained by the use-based access restrictions defined by the first user.

An example device may include one or more processors to receive a request for a service from a requestor user device; provide transaction information associated with the service to a provider user device, where the transaction information may include location information corresponding to a location at which the service may be provided; obtain verification information from the requestor user device based on an interaction associated with the requestor user device or the provider user device at the location, where the verification information may include one or more characteristics of the requestor user device; generate a verification token based on the one or more characteristics of the requestor user device; provide the verification token to the requestor user device; and provide the verification information to the provider user device to permit the provider user device to verify the requestor user device, in connection with performance of the service, based on receiving the verification information and obtaining the verification token from the requestor user device.

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.

A method for submission of payment transaction requests from a point of sale (POS) terminal to a financial institution includes reading payment information from a payment vehicle, reading financial institution routing information from the payment vehicle, reading a payment vehicle certificate from the payment vehicle, requesting consumer authentication information from a consumer, and submitting a payment transaction request to the financial institution using the financial institution routing information, a POS terminal certificate, and the payment vehicle certificate. An authentication certificate for submission of payment transaction requests from a point of sale (POS) terminal to a financial institution may be generated by receiving a request for an authentication certificate from a requestor, the request comprising a requestor ID and one or more capabilities of the requestor, verifying the requestor ID, generating an authentication certificate for the requestor, and returning the generated authentication certificate to the requestor.