Smart Contract Management Method and Device for Blockchain

Smart Contract Management Method and Device for Blockchain

Term Definition Smart Contract A program stored on a blockchain that is automatically executed when pre-set conditions are met. Blockchain A distributed, immutable list of transaction records in which each block is linked to the previous block and protected using cryptography. Trusted Execution Environment (YY) An isolated execution environment that protects code and data from attacks from higher-level privileged software (such as an operating system). Distributed Ledger A type of database that is shared, replicated, and synchronized among multiple participants, with no central data storage or management capabilities. Encryption The process of converting information into an incomprehensible code that can only be read by someone with a decryption key. Decryption The process of using a key to convert encrypted information back to its original form. Contract Code The code that defines the functions of a smart contract. Invoking Transaction A transaction used to trigger the execution of a smart contract. Managed Contract A regulated or restricted smart contract. Management Rule A rule used to determine whether a smart contract is regulated. Blacklist A list of prohibited or restricted items. Contract Address A unique address that identifies a smart contract on the blockchain. Symmetric Encryption A type of encryption that uses a single key for encryption and decryption. Asymmetric Encryption A type of encryption that uses a pair of keys (public and private keys) for encryption and decryption. Digital Envelope A cryptographic technique that combines symmetric and asymmetric encryption. Intel SGX Intel Software Guard Extensions, a hardware-supported trusted execution environment technology. Short Answer Questions

Briefly describe the core features of blockchain technology and its application in smart contracts. Blockchain technology has the characteristics of decentralization, transparency, security, and immutability. In smart contracts, blockchain can be used as a platform for storing and executing contract code to ensure transparent execution and immutability of contracts.

Explain what a smart contract is and how it differs from a traditional contract. A smart contract is an automatically executed contract stored on a blockchain, with terms defined by code. Compared with traditional contracts, smart contracts can be executed automatically, without the intervention of a third party, and are open, transparent, and tamper-proof.

Describe the role of the Ethereum Virtual Machine (EVM) in the execution of smart contracts. EVM is a virtual machine that runs on every node in the Ethereum network and is responsible for executing the code of smart contracts. Users publish and call smart contracts on EVM.

Explain why privacy protection of smart contracts is important and list some technologies for implementing privacy protection. The code and data of smart contracts are usually stored on a public and transparent blockchain, and privacy protection can prevent sensitive information from being leaked. Common privacy protection technologies include homomorphic encryption, zero-knowledge proofs, and trusted execution environments (YY).

Explain the concept of trusted execution environments (YY) and explain how they enhance the security of smart contracts. YY is an isolated execution environment that protects code and data from attacks from higher-level privileged software. In smart contracts, YY can be used to protect the confidentiality and integrity of contract code and data.

Explain how to create and call smart contracts in a blockchain. To create a smart contract in a blockchain, the contract code needs to be compiled into bytecode and deployed on the blockchain. Calling a smart contract is achieved by sending a transaction to the contract address.

Explain what smart contract management is and why smart contracts need to be managed. Smart contract management refers to the management of the life cycle of smart contracts, including deployment, execution, monitoring, and upgrades. Managing smart contracts can improve the security and reliability of contracts and ensure that contracts are executed as expected.

Describe how to use smart contract blacklists to manage smart contracts. Smart contract blacklists contain the addresses of smart contracts that need to be regulated or restricted. Nodes can determine whether a contract is allowed to execute by comparing the contract address in the call transaction with the blacklist.

Explain how encryption and decryption technologies are used and what they do in smart contract management. Encryption technology can protect the confidentiality of smart contract code and data. Node devices use decryption keys in a trusted execution environment to decrypt and execute encrypted contract code.

Explain the application of Intel SGX technology in smart contract management and explain how it provides security. Intel SGX is a hardware-level YY technology that can create a secure area called an "enclave" for executing sensitive code and storing sensitive data. In smart contract management, SGX can be used to protect the confidentiality and integrity of contract code and data.