Abstract: A computer-implemented method for improving security of smart contract comprises: obtaining a first and a second transactions both invoking a smart contract, wherein the first transaction is associated with a protection condition; executing the second transaction and updating a current state of the smart contract; determining whether the updated current state of the smart contract satisfies the protection condition; in response to determining that the updated current state satisfies the protection condition, executing the first transaction, and recording the second and the first transactions into a data block for adding to a blockchain; and in response to determining that the updated current state does not satisfy the protection condition, recording the second transaction into another data block for adding to the blockchain, without executing the first transaction.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to one implementation the method includes: receiving a transaction request for invoking a first contract; obtaining a first instruction code and a function index table, wherein the function index table is used to indicate a memory address of an instruction code corresponding to each of import and export functions in the first contract; determining a first memory address corresponding to the invocation function based on the function index table; and executing the first instruction code in the first memory address based on the determined first memory address.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media for managing access to an account in a blockchain system. One of the methods includes: receiving, from a first account of the blockchain system, a request for accessing a second account of the blockchain system; determining an account level of the first account based on the request; determining an account level of the second account; determining whether the account level of the first account satisfies an account condition based on the account level of the second account; and permitting the request for accessing the second account based on a determination that the account level of the first account satisfies the account condition.

Abstract: A computer-implemented method for improving security of smart contract comprises: obtaining a first and a second transactions both invoking a smart contract, wherein the first transaction is associated with a protection condition; executing the second transaction and updating a current state of the smart contract; determining whether the updated current state of the smart contract satisfies the protection condition; in response to determining that the updated current state satisfies the protection condition, executing the first transaction, and recording the second and the first transactions into a data block for adding to a blockchain; and in response to determining that the updated current state does not satisfy the protection condition, recording the second transaction into another data block for adding to the blockchain, without executing the first transaction.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to one implementation the method includes: receiving a transaction request for invoking a first contract; obtaining a first instruction code and a function index table, wherein the function index table is used to indicate a memory address of an instruction code corresponding to each of import and export functions in the first contract; determining a first memory address corresponding to the invocation function based on the function index table; and executing the first instruction code in the first memory address based on the determined first memory address.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to one implementation the method includes: receiving a transaction request for invoking a first contract; obtaining a first instruction code and a function index table, wherein the function index table is used to indicate a memory address of an instruction code corresponding to each of import and export functions in the first contract; determining a first memory address corresponding to the invocation function based on the function index table; and executing the first instruction code in the first memory address based on the determined first memory address.

Abstract: A computer-implemented method for improving security of smart contract comprises: obtaining a first and a second transactions both invoking a smart contract, wherein the first transaction is associated with a protection condition; executing the second transaction and updating a current state of the smart contract; determining whether the updated current state of the smart contract satisfies the protection condition; in response to determining that the updated current state satisfies the protection condition, executing the first transaction, and recording the second and the first transactions into a data block for adding to a blockchain; and in response to determining that the updated current state does not satisfy the protection condition, recording the second transaction into another data block for adding to the blockchain, without executing the first transaction.

Abstract: Embodiments of the present application disclose a method, device, and system for caching data resources or managing cached data resources. The method includes obtaining data resources, the data resources corresponding to an application installed on a terminal, obtaining a resource caching strategy based at least in part on the application to which the data resources belong, and caching the obtained data resources based at least in part on the obtained resource caching strategy.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to one implementation the method includes: receiving a transaction request for invoking a first contract; obtaining a first instruction code and a function index table, wherein the function index table is used to indicate a memory address of an instruction code corresponding to each of import and export functions in the first contract; determining a first memory address corresponding to the invocation function based on the function index table; and executing the first instruction code in the first memory address based on the determined first memory address.

Abstract: Disclosed herein are methods, devices, and apparatuses, including computer programs stored on computer-readable media for managing access to an account in a blockchain system. One of the methods includes: receiving, from a first account of the blockchain system, a request for accessing a second account of the blockchain system; determining an account level of the first account based on the request; determining an account level of the second account; determining whether the account level of the first account satisfies an account condition based on the account level of the second account; and permitting the request for accessing the second account based on a determination that the account level of the first account satisfies the account condition.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to the method in the implementations, in a phase of deploying a smart contract, a bytecode included in a contract module corresponding to the contract is obtained; and then the bytecode is parsed into executable instruction codes, and the executable instruction codes are stored in a cache memory. Further, a function index table is determined for import and export functions in the bytecode, where the function index table is used to indicate a memory address of an instruction code corresponding to each of the import and export functions; and the function index table is stored in the cache memory.

Abstract: Implementations of the present specification provide a method for deploying a smart contract. According to the method in the implementations, in a phase of deploying a smart contract, a bytecode included in a contract module corresponding to the contract is obtained; and then the bytecode is parsed into executable instruction codes, and the executable instruction codes are stored in a cache memory. Further, a function index table is determined for import and export functions in the bytecode, where the function index table is used to indicate a memory address of an instruction code corresponding to each of the import and export functions; and the function index table is stored in the cache memory.

Abstract: A computer-implemented method for improving security of smart contract comprises: obtaining a first and a second transactions both invoking a smart contract, wherein the first transaction is associated with a protection condition; executing the second transaction and updating a current state of the smart contract; determining whether the updated current state of the smart contract satisfies the protection condition; in response to determining that the updated current state satisfies the protection condition, executing the first transaction, and recording the second and the first transactions into a data block for adding to a blockchain; and in response to determining that the updated current state does not satisfy the protection condition, recording the second transaction into another data block for adding to the blockchain, without executing the first transaction.

Abstract: Embodiments of the present application disclose a method, device, and system for caching data resources or managing cached data resources. The method includes obtaining data resources, the data resources corresponding to an application installed on a terminal, obtaining a resource caching strategy based at least in part on the application to which the data resources belong, and caching the obtained data resources based at least in part on the obtained resource caching strategy.

Abstract: Embodiments of the present application relate to a method, device, and system for managing, using, and updating application resources. A method includes obtaining, by one or more processors, an application development kit, wherein the application development kit comprises resources for one or more application components, obtaining, by the one or more processors, the resources for at least one of the one or more application component resources included in the application development kit, packaging, by the one or more processors, at least one or more application component resources to obtain one or more application resource kits, wherein a unit of resources organization for the one or more application resource kits is the one or more application components, and providing the one or more application resource kits to a client device in response to obtaining a request for the one or more application resource kits.