![]() ![]() Note that the chain ID is encoded in the v parameter of the signature, so we don’t include the chain ID itself in the final signed transaction. Encode the signed transaction: RLP(nonce, gasPrice, gasLimit, to, value, data, v, r, s).īy decoding the RLP-encoded transaction data, we can get the raw transaction parameters and signature again.Sign the hash with a private key using the ECDSA algorithm, according to the steps described above.Get the Keccak256 hash of the RLP-encoded, unsigned transaction.Encode the transaction parameters: RLP(nonce, gasPrice, gasLimit, to, value, data, chainId, 0, 0).We can encode a signed transaction like this: Ethereum also uses an additional v (recovery identifier) variable. Signing and verifying using ECDSAĮCDSA signatures consist of two numbers (integers): r and s. The functions that derive the values are called “ trapdoor functions”:Ī trapdoor function is a function that is easy to compute in one direction, yet difficult to compute in the opposite direction (finding its inverse) without special information, called the “trapdoor”. This way we can create signatures that are safe and tamperproof. Using elliptic curve point manipulation, we can derive a value from the private key, which is not reversible.
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