In a blockchain-based IoT security system, which feature ensures that data once written cannot be altered retroactively?
- Decentralization
- Encryption
- Immutability
- Smart Contracts
Immutability is a core feature of blockchain technology. Once data is written to a blockchain, it cannot be altered retroactively, providing a tamper-proof record of information. Encryption, Decentralization, and Smart Contracts are relevant but serve different purposes.
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