Method for upgrading smart contract in blockchain system

Abstract

The present invention discloses a method for upgrading a smart contract in a blockchain system. The method comprises the following steps: A. at a language level, enabling a contract to directly read and write state variables in another contract under the premise of complying with security constraints, and when the code is running, providing a separate storage area for the state variables through the nebula chain virtual machine NVM for direct access by other contracts; B. providing a shared keyword at the language level, wherein the state variables modified by using the keyword can be accessedby other contracts; and C. translating the shared keyword defined by the language level into a pre-defined completed function by the corresponding compiler front end, and generating the underlying virtual machine LLVM byte code. According to the upgrade mechanism provided by the upgrade method of the present invention, the security of the smart contract can be ensured while solving the smart contract upgrade problem.

Description

technical field [0001] The present invention relates to blockchain technology, in particular to a method for upgrading smart contracts in a blockchain system. Background technique [0002] The current blockchain technology is considered to be the next-generation disruptive core technology after the steam engine, electricity, and the Internet. If the steam engine has released people's productivity, electricity has solved people's basic living needs, and the Internet has completely changed the way information is transmitted, then the blockchain, as a machine for constructing trust, may completely change the way the value of the entire human society is transmitted. [0003] Blockchain technology (Blockchain Technology, BT) is an Internet database technology, which is characterized by decentralization, openness and transparency, allowing everyone to participate in database records. The basic concepts of the blockchain include: Transaction, an operation that leads to a change in...

AI Technical Summary

Problems solved by technology

[0008] But as smart contracts started to gain more and more use, their processes and codes became more and more complex, and people found that, just like real-world contracts, it was difficult to design and code without careful review. Avoid human errors. Once a hacker finds a loophole, the loss is often huge

The DAO attack in June 2016 caused a loss of USD 60 million for Ethereum users due to a code defect; more recently, due to a vulnerability in the Parity wallet, the loss was worth USD 30 million

These two types of solutions have their limitations and cannot solve all problems: the separation of contract code and storage adds a lot of complexity to the design, and sometimes it is not feasible; although the proxy contract can point to the new contract, the state data of the old contract It cannot be migrated; some contracts did not have a good design at the beginning of development, and did not leave interfaces for future upgrades

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