Study Guide for Data Migration of Blockchain Systems

Quiz

Describe the role of scope information in data migration to a new blockchain.

Explain how old transactions can be migrated to the new blockchain while maintaining data integrity.

What specific aspects of the old blockchain system can be included in the “Related Information”?

What purpose does traceability information have in the new blockchain structure?

What does the old blockchain’s call address information contain and what is its purpose?

Detail the key differences between the old and new transaction data structures.

Why does the migration process require parsing old transactions?

What factors need to be considered when executing converted transactions in the new blockchain system?

Explain how smart contracts can be utilized after the data migration is completed.

How feasible is multi-blockchain data migration?

Answer

Scope information defines the scope of data to be migrated from the old blockchain to the new blockchain, ensuring that only the specified data set is migrated.

Data integrity is maintained by converting old transactions into a new format that is compatible with the new blockchain while retaining the original transaction details in the “Traceability Information” field.

“Related Information” may include how the old blockchain is accessed, the genesis block data, the data of the last migrated block, and the world state, providing comprehensive insight into the migration context.

The traceability information acts as a bridge, connecting the new transaction with its corresponding old transaction, which can be traced back to the old blockchain.

The call address information of the old blockchain can contain an API address or a specific node address, allowing access to the old blockchain for verification and auditing.

The new transaction data structure includes an additional "traceability information" field that links to the corresponding transaction in the old blockchain, while the old transaction data structure lacks this field.

Parsing the old transaction allows the necessary data to be extracted and reformatted into a new transaction structure compatible with the new blockchain.

To avoid conflicts, the execution order of the new transactions should reflect their original order in the old blockchain, ensuring data integrity and logical consistency.

Smart contracts can be deployed on the new blockchain to query new transactions through their traceability information, providing convenient access to old data.

By using blockchain B as the "old" blockchain of blockchain C, the same data migration process can be used to use blockchain B as the "old" blockchain of blockchain C, and so on, thereby achieving multiple blockchain data migration.

Paper Question

Discuss the challenges and solutions for maintaining data integrity and immutability when migrating data from one blockchain to another.

Explain the concept of “traceability information” and its importance in ensuring auditability and verifiability of migration from an old blockchain to a new blockchain.

Evaluate the implications of the inclusion of different types of information (e.g., old blockchain access methods, world state) in the context of new blockchain data migration.

Analyze the implications of designing smart contracts in the new blockchain to interact with migrated data, focusing on transparency, trust, and accountability.

Discuss the long-term impact of multi-generation blockchain data migration, considering challenges of scalability, efficiency, and maintaining integrity of historical data.

Glossary

Term Definitions Blockchain A decentralized and immutable ledger that stores transaction information in chronological order. Genesis Block The first block in a blockchain that initializes the blockchain and establishes the initial state. Transaction An exchange of value performed and recorded in a blockchain network. Data Migration The process of transferring data from one system (in this case, the old blockchain) to another system (the new blockchain). Scope Information Data that defines a specific range of data to be migrated from the old blockchain to the new blockchain. The source blockchain from which the old blockchain performs data migration. The target blockchain from which the new blockchain receives migrated data from the old blockchain. Traceability Information embedded in new transactions to provide a link to the corresponding transaction in the old blockchain. The call address information of the old blockchain contains information about the API address or the node address that allows access to the old blockchain for verification or auditing. Smart contracts are self-executing contracts that are stored on the blockchain and automatically executed to facilitate, verify or enforce the agreement.