Vehicle Blockchain Data Deletion With Lowest Block Verification
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Solution Overview
Problem
The limited storage capacity in vehicles and the high cost of external storage solutions make it difficult to reliably store large amounts of data acquired over time, and existing data management methods fail when vehicles cannot connect to clouds for backup.
Innovation Solution
A data storage device with a deletion unit to remove unnecessary data from the blockchain and a lowest block number storage unit to verify legitimate data deletion, ensuring the integrity of the blockchain by updating the lowest block number upon legitimate deletion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is accumulated in a vehicle using a blockchain over a long period, then data reliability is improved, but storage capacity is exhausted
Solution Approach 1:
The patent extracts unnecessary data from the blockchain by implementing a deletion unit that identifies and removes data that is no longer needed for verification purposes. This allows the system to maintain only the essential data required for blockchain integrity while freeing up storage capacity, thereby resolving the contradiction between maintaining data reliability and preserving storage capacity.
Solution Approach 2:
The patent applies the discarding and recovering principle by systematically deleting obsolete blockchain data and recovering storage space. The deletion unit discards data that has been verified and is no longer needed, while the recovered storage capacity can be reused for new data, thus maintaining reliability while managing storage resources efficiently.
2Quantity of substance
If unnecessary data is deleted from the blockchain to free storage space, then storage capacity is recovered, but data integrity may be compromised
Solution Approach 1:
The patent applies preliminary action by storing the lowest block number before data deletion occurs. This pre-recorded reference point enables the system to verify that subsequent deletions have not compromised data integrity, as any unauthorized tampering would result in a mismatch between the stored lowest block number and the actual blockchain state.
Solution Approach 2:
The patent implements feedback through verification processing that checks whether the stored lowest block number matches the actual blockchain data after deletion. This feedback mechanism ensures that data integrity is maintained by detecting any unauthorized modifications, thereby allowing safe deletion of unnecessary data while preserving reliability.
3Quantity of substance
If external storage such as SD memory cards is used for vehicle data, then storage capacity is increased, but cost and reliability requirements increase
Solution Approach 1:
The patent applies self-service by enabling the vehicle's existing storage system to manage its own capacity through automated data deletion. The deletion unit autonomously identifies and removes unnecessary blockchain data, allowing the system to serve itself without requiring additional external storage devices, thereby avoiding the increased cost and reliability burden associated with external storage solutions.
Data Source
AI summary
An in-vehicle ECU deletes part of data in a blockchain, when the data stored in the blockchain accumulates to have a bigger data size. Then, the in-vehicle ECU, upon having the part of data deleted from the blockchain, acquires a lowest block number in the blockchain, and stores and updates the number in a secure world. Therefore, while the stored lowest block number is updated when data deletion is a legitimate one, the data deletion caused by unauthorized tampering will not lead to an update of the stored lowest block number.