<ul><li>Blockchain is a distributed digital ledger that ensures tamper-evident and irreversible transactions.</li><li>Blockchain is secure due to immutability via hashing and chaining blocks together to invalidate any tampering attempts.</li><li>Consensus mechanisms like Proof of Work ensure network security by requiring computational work for block authentication.</li><li>Blockchain security risks include smart contract vulnerabilities, phishing attacks, and the importance of user safety measures.</li></ul>

Cracking the Code on Blockchain Security: A Plain-English Primer

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