New answers tagged keccak
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You don’t need to use solidity for that you can use directly web3 like: web3.eth.accounts.recover(hash, v, r, s); (to get the signer address).
See https://web3js.readthedocs.io/en/v1.2.0/web3-eth-accounts.html?highlight=recover#recover
But if you still want to use solidity you need to deploy the contract with the ecrecover function and call it with web3.
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