signTransaction

async signTransaction(
  txHex: string,
  keyType?: string
): Promise<string>

// Auto-detect key type
const signedTx = await wallet.signTransaction("02000000...");

// Use specific key type
const signedWithIdentity = await wallet.signTransaction(
  "02000000...",
  "identity"
);
console.log("Signed transaction:", signedWithIdentity);