Blockchain Multimedia Tamper-Proofing via Hash Extraction
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Solution Overview
Problem
Current surveillance and audio recording devices face challenges in proving the authenticity and recording time of recorded content, as the content can be easily forged and the proofing process is not automatic.
Innovation Solution
A blockchain-based system that captures, decodes, and hashes multimedia data streams, selecting key frames and uploading their hash values and timestamps to a blockchain network for verification, ensuring the content's integrity and recording time through a consensus mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional recording devices are used to store multimedia data, then storage and recording functionality is provided, but the authenticity and recording time of the content cannot be verified and the content can be easily forged
Solution Approach 1:
The patent introduces blockchain technology as an intermediary between the recording device and the verification system. The blockchain network acts as a trusted mediator that independently verifies and records the hash values and timestamps of multimedia data, eliminating the need for complex verification mechanisms within the recording device itself while ensuring authenticity.
Solution Approach 2:
The patent replaces traditional mechanical verification methods (manual timestamping, physical evidence handling) with cryptographic hash functions and blockchain consensus mechanisms. This substitution enables automatic, tamper-proof verification of recording time and content integrity without requiring complex physical or mechanical verification systems.
2Extent of automation
If manual verification methods are used to prove recording time, then verification is possible, but the process is not automatic and requires human intervention
Solution Approach 1:
The patent performs preliminary actions by calculating the hash value of the multimedia data and recording it on the blockchain at the moment of data generation. This preliminary hashing and blockchain recording automatically captures the recording time and content integrity, eliminating the need for manual verification later and enabling instant automated verification.
Solution Approach 2:
The patent establishes a feedback mechanism where the blockchain network continuously provides verification information (hash values and timestamps) back to the system. This automated feedback loop enables real-time verification of recording authenticity without human intervention, significantly reducing verification time.
3Reliability
If all multimedia data is uploaded to blockchain for verification, then complete authenticity verification is achieved, but the data transmission and storage burden increases significantly
Solution Approach 1:
The patent extracts only the essential verification elements (hash values and timestamps) from the complete multimedia data and uploads only these extracted elements to the blockchain. This extraction approach maintains complete verification accuracy while dramatically reducing the data transmission and storage burden, as the blockchain stores minimal cryptographic identifiers rather than the entire multimedia content.
Data Source
AI summary
A method for rendering a multimedia data stream tamper-proof and of evidential value when recorded in a block chain system reads and decodes the multimedia data stream to obtain multiple frames of data arranged in sequence, and calculates a hash value of each frame of data of the multimedia data stream. One or more items of data are selected from the multiple frames of data based on a predetermined rule and information as to properties of the one or more items of data is uploaded to the block chain system for recording purposes. A device for applying the method to a multimedia data stream is also disclosed.