Private blockchain update off-chain notification learning

Term definition blockchain A distributed ledger technology that uses cryptography to link blocks of data together to form an immutable record of transactions. Private blockchain A blockchain network that requires permission to join and the identities of participants are known and verified. Public blockchain A blockchain network that anyone can join without specific identity verification. Chaincode Program code that runs on a blockchain network to define and manage assets and execute transactions. Smart contract A self-executing contract stored on a blockchain with its terms written directly into the code. Non-participant system An external entity that has no access to private blockchain data. Notifier An entity responsible for notifying non-participant systems of private blockchain updates. Receiver A non-participant system that receives notifications of private blockchain updates. Data field A data value stored on a private blockchain and associated with a non-participant system. Commitment funds Funds stored on a public blockchain that are used to incentivize notifiers and receivers to fulfill their obligations. Short answer questions

What is the main difference between private and public blockchains? Private blockchains require permission to join and the identities of participants are known and verified, while public blockchains allow anyone to join without specific identity verification.

What is chaincode and what role does it play in private blockchains? Chaincode is a program code that runs on a blockchain network to define and manage assets and execute transactions, ensuring data security and transaction reliability.

In this learning material, what challenges do non-participant systems face? Non-participant systems cannot access private blockchain data and therefore cannot obtain timely updates related to them.

What role does the notifier play in the private blockchain update notification mechanism? The notifier is responsible for monitoring private blockchain data updates and sending update information to relevant non-participant systems.

How can public blockchains be used to ensure that notifiers and recipients fulfill their obligations? Public blockchains store committed funds to incentivize notifiers and recipients to fulfill their obligations. If one party violates the agreement, the other party will receive funds as compensation.

Describe the process of linking a non-participant system to a private blockchain data field. The notifier stores the public key of the non-participant system and the identifier of the data field in the access matrix of the private blockchain to establish an association between the two.

How does the notifier provide the recipient with verifiable proof of the changed data field? The notifier can use cryptographic techniques such as zero-knowledge proofs to prove the authenticity and source of the data to the recipient without revealing the content of the data.

How does the recipient verify the authenticity of the information contained in the received notification? The recipient can decrypt the information using the encryption key provided by the notifier and compare it with the hash value stored on the public blockchain to verify the integrity and authenticity of the information.

In addition to data update notifications, what other functions can the system described in this learning material provide? The system can also ensure the confidentiality of data, prevent unauthorized access, and provide an undeniable receipt to prove that the recipient has received the information.

What are the potential application scenarios of the system described in this learning material? The system can be used in supply chain management, healthcare, identity authentication, digital rights management, and other scenarios where sensitive information needs to be shared while protecting data privacy.

Paper title

Analyze and compare traditional blockchain access control methods and the data sharing protocol proposed in this learning material, focusing on the differences in security and privacy.

Explore the application of the commitment fund mechanism to other scenarios that require trust and reliable data exchange, such as IoT data sharing, decentralized finance, etc.

Evaluate the performance and scalability of the system described in this learning material in blockchain networks of different sizes and types, and propose improvement suggestions.

Study the impact of quantum computing on the security of blockchain technology, and analyze the advantages and disadvantages of the quantum-safe blockchain solution proposed in this learning material.

Design a practical application case based on the system described in this learning material, such as supply chain finance, medical data sharing, etc., and explain the system design and implementation details in detail.