What are sidechains?

A) Another term for a hash function

B) Smart Contracts that have forked off the main Blockchain

C) A parallel network running adjacent to the main blockchain network for additional security

D) Any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain

Correct Answer : Any mechanism that allows tokens from one blockchain to be securely used within a completely separate Blockchain

Explanation : A sidechain is a separate blockchain which runs in parallel to Ethereum Mainnet and operates independently. It has its own consensus algorithm (e.g. proof-of-authority, Delegated proof-of-stake, Byzantine fault tolerance). It is connected to Mainnet by a two-way bridge.