Blockchain Data Access Learning Guide

Blockchain Data Access Learning Guide

Questions and Answers

1. Please briefly describe the process of cross-blockchain data access.

2. How does the authorized blockchain device verify the identity of the requesting blockchain device?

3. What does the authorization information contain?

4. How is the authorization validity period set?

5. How does the requesting blockchain device obtain the authorization information?

6. How does the authorized blockchain device handle the authorization information in the newly added data block?

7. How does the requesting blockchain device actively release the authorization?

8. What role does the consensus mechanism play in cross-blockchain data access?

9. Please list two ways to verify the legitimacy of the authorization request.

10. In the cross-blockchain data access system, what functions do the first blockchain device and the second blockchain device perform respectively?

Question and Answers

1. The requesting blockchain device sends an authorization request to the authorized blockchain device, and the authorized blockchain device verifies the request and decides whether to authorize through the consensus mechanism. If authorized, the authorized blockchain device configures the authorization information and sends it to the requesting blockchain device. After the requesting blockchain device obtains the authorization information, it can send a data access request, and the authorized blockchain device verifies the authorization information and returns the data.

**2. ** The authorized blockchain device verifies its identity by verifying whether the requesting blockchain device identifier and the corresponding authorization information match.

**3. ** The authorization information usually includes an authorization token and an authorization validity period.

**4. ** The authorization validity period can be pre-set, such as one month, two months or other time periods.

**5. ** The requesting blockchain device sends an authorization request to the authorized blockchain device. After the authorized blockchain device agrees to the authorization, it will send the configured authorization information to the requesting blockchain device.

**6. ** When adding a new data block, the authorized blockchain device will verify whether the existing authorization information is within the validity period. If it is within the validity period, the authorization information will be added to the new data block; if it has expired, it will not be added and the release of the authorization information will be recorded.

**7. ** The requesting blockchain device can send an authorization release request to the authorized blockchain device. After verifying the request, the authorized blockchain device will release the corresponding authorization information.

**8. ** The consensus mechanism is used by multiple blockchain nodes on the authorized blockchain device to jointly decide whether to agree to the authorization request of the requesting blockchain device.

**9. ** Two ways to verify the legitimacy of authorization requests include: verifying whether the format of the authorization request is correct and verifying whether the requesting blockchain device identifier is legal.

10. In the cross-blockchain data access system, the first blockchain device can serve as a requesting blockchain device to send authorization requests and data access requests; the second blockchain device can serve as an authorizing blockchain device to verify requests, configure authorization information, and return data.

Paper title

Compare and contrast several existing cross-blockchain data access methods and discuss their advantages and disadvantages.

Explore the role and challenges of consensus mechanisms in cross-blockchain data access and propose improvement suggestions.

Analyze the security risks of cross-blockchain data access and design corresponding security solutions.

Combined with actual application scenarios, discuss the application value and future development trend of cross-blockchain data access.

Study the cross-blockchain data sharing and permission control mechanism based on authorization and propose specific implementation plans.

Key terms

Term definition Blockchain (Blockchain) is a distributed database that uses cryptographic technology to ensure data security and immutability. Cross-blockchain (Cross-blockchain) refers to the technology for interaction and data exchange between different blockchains. Authorization refers to the permission granted to an entity to access specific resources or perform specific operations. Authorization Information is used to verify the credentials of authorization, such as authorization tokens and validity periods. Authorizing Blockchain Apparatus is a blockchain device that has data access rights and is responsible for verifying authorization and providing data. Requesting Blockchain Apparatus is a blockchain device that needs to access data. Blockchain Node is a participant in the blockchain network, responsible for storing blockchain data, verifying transactions, and maintaining network security. Consensus Mechanism is an algorithm used in a blockchain network to ensure that all nodes reach a consensus on the state of data. Authorization Token is a string used to identify authorization, usually generated by an authorizing blockchain device. Validity Period is the period of time during which authorization is valid.