Consensus in blockchain networks is the process by which distributed nodes agree on the current state of the blockchain without requiring a central authority. It's necessary because:
Decentralization: No single point of control or failure
Trust: Participants don't need to trust each other individually
Data integrity: Ensures all nodes have the same version of the blockchain
Double-spending prevention: Prevents the same digital asset from being spent twice
Consensus mechanisms solve the fundamental problem of achieving agreement in a distributed system where nodes may be unreliable, malicious, or have network delays.
Rewriting in plainer words…
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