The Tencent Cloud Blockchain Intelligent Computing Center solution prevents data tampering through the inherent characteristics of blockchain technology and additional security mechanisms.
Immutable Ledger: Blockchain records all transactions in a decentralized and chronological manner. Once data is written to the blockchain, it cannot be altered or deleted without consensus from the network, ensuring data integrity.
Cryptographic Hashing: Each block contains a cryptographic hash of the previous block, creating a chain of linked blocks. Any attempt to modify data in one block would require recalculating the hashes of all subsequent blocks, which is computationally infeasible.
Consensus Mechanisms: The solution uses consensus algorithms (e.g., PBFT) to ensure that all participating nodes agree on the validity of transactions before they are added to the blockchain, preventing unauthorized changes.
Access Control & Encryption: Sensitive data is encrypted both in transit and at rest, and access is restricted through role-based permissions, reducing the risk of tampering by unauthorized users.
Example: In a supply chain scenario, the solution tracks product movements from manufacturer to retailer. If a malicious actor tries to alter delivery records, the blockchain's immutability ensures the original data remains intact, and any tampering attempt is detectable.
For such use cases, Tencent Cloud provides Blockchain Service (TBaaS), which simplifies blockchain deployment and integrates with other cloud services for enhanced security and scalability.