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Mappings are unique key-value pair can keep track of who to assign the result to.
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How To Get a Random Number Using Chainlink VRF v2Chainlink VRF provides smart contract developers with a provably fair source of randomness for building dynamic and cryptographically secure blockchain. Chainlink VRF is the verified solution of randomness specifically designed for all smart contracts to solve the issue of probability. In the blockchain space, Chainlink VRF is the industry-leading secure random number generator (RNG), enabling smart contracts and off-chain.
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