Build an unsigned transaction

import { getPublicKeyFromPrivate } from "@stacks/encryption";
import { 
  makeUnsignedSTXTokenTransfer,
  makeUnsignedContractCall,
  Cl,
  AnchorMode,
  PostConditionMode
} from "@stacks/transactions";
import { STACKS_TESTNET } from "@stacks/network";

// Get public key from private key
const privateKey = "753b7cc01a1a2e86221266a154af739463fce51219d97e4f856cd7200c3bd2a601";
const publicKey = getPublicKeyFromPrivate(privateKey);

// Build unsigned STX transfer
const unsignedTx = await makeUnsignedSTXTokenTransfer({
  recipient: "ST1SJ3DTE5DN7X54YDH5D64R3BCB6A2AG2ZQ8YPD5",
  amount: 1000000n, // 1 STX in micro-STX
  fee: 200n,
  nonce: 0n,
  network: STACKS_TESTNET,
  memo: "Test transfer",
  publicKey,
  anchorMode: AnchorMode.Any,
  postConditionMode: PostConditionMode.Deny,
});

// Transaction is ready for external signing
console.log("Unsigned transaction created:", unsignedTx.txid());