Github: https://github.com/a3994288/signature-verification-demo

Credit: https://medium.com/@PhABC/off-chain-whitelist-with-on-chain-verification-for-ethereum-smart-contracts-1563ca4b8f11

Other examples: https://docs.soliditylang.org/en/v0.8.11/solidity-by-example.html#the-full-contract

What is Cryptographic: https://medium.com/mycrypto/the-magic-of-digital-signatures-on-ethereum-98fe184dc9c7

Sign message with ethersjs: https://docs.ethers.io/v5/getting-started/#getting-started–signing

ECDSA: https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/utils/cryptography/ECDSA.sol

Verify your signature: https://etherscan.io/verifySig

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