- How to encode structs properly in typescript
ethers.utils.defaultAbiCoder.encode(["tuple(string)"], [[txn.message]]);
- ECDSA recovery does not recover the right address singed by
wallet.signMessage- because you need to preappend a string before digest being recovered
x = keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", x));
- Note that 32 represents size of digest
- remember in smart contracts you need to remember to look further and code safe
- Not the right way to implement nonce
- it can be attacked by making a transaction with max uint hence stopping the contract
- https://geth.ethereum.org/docs/rpc/ns-personal#personal_sign