chore: use SmartAccount for registration

code/webauthn/frontend/utils/tx.ts

@@ -1,5 +1,5 @@
 import { DEFAULT_GAS_PER_PUBDATA_LIMIT, getPaymasterParams } from 'zksync-ethers/build/utils';
-import { EIP712Signer, type Wallet, type Provider, utils, type types } from 'zksync-ethers';
+import { type Wallet, type Provider, type types, SmartAccount } from 'zksync-ethers';
 import { ethers } from 'ethers';
 import accountAbiJSON from '../../contracts/artifacts-zk/contracts/Account.sol/Account.json';
 
@@ -43,20 +43,8 @@ export async function registerKeyInAccount(pubKey: string, account: string, prov
     const data = contract.interface.encodeFunctionData('updateR1Owner', [pubKey]);
     const transferAmount = '0';
     const registerTx = await getTransaction(account, account, transferAmount, data, provider);
-    const signedTxHash = EIP712Signer.getSignedDigest(registerTx);
-    const signingKey: ethers.utils.SigningKey = new ethers.utils.SigningKey(wallet.privateKey);
-    const walletSignature = signingKey.signDigest(signedTxHash);
-    const sig = ethers.utils.joinSignature(walletSignature);
-    const signature = ethers.utils.concat([sig]);
-
-    registerTx.customData = {
-      ...registerTx.customData,
-      customSignature: signature,
-    };
-
-    const finalTx = utils.serialize(registerTx);
-    const sentTx = await provider.sendTransaction(finalTx);
-    await sentTx.wait();
+    const smartAccount = new SmartAccount({ address: account, secret: wallet.privateKey }, provider);
+    await smartAccount.sendTransaction(registerTx);
   } catch (error) {
     console.error('Error:', error);
   }