fix: add base tx example

examples/p-chain/base.ts

@@ -0,0 +1,33 @@
+import { addTxSignatures } from '../../src/signer';
+import { TransferableOutput } from '../../src/serializable/avax';
+import { bech32ToBytes, hexToBuffer } from '../../src/utils';
+import { getContextFromURI } from '../../src/vms/context';
+import { newBaseTx } from '../../src/vms/pvm';
+import { pvmapi } from '../chain_apis';
+
+const P_CHAIN_ADDRESS = process.env.P_CHAIN_ADDRESS;
+const PRIVATE_KEY = process.env.PRIVATE_KEY;
+
+const main = async () => {
+  if (!P_CHAIN_ADDRESS || !PRIVATE_KEY) {
+    throw new Error('Missing environment variable(s).');
+  }
+
+  const { utxos } = await pvmapi.getUTXOs({ addresses: [P_CHAIN_ADDRESS] });
+  const context = await getContextFromURI(process.env.AVAX_PUBLIC_URL);
+
+  const tx = newBaseTx(context, [bech32ToBytes(P_CHAIN_ADDRESS)], utxos, [
+    TransferableOutput.fromNative(context.avaxAssetID, BigInt(0.1 * 1e9), [
+      bech32ToBytes(P_CHAIN_ADDRESS),
+    ]),
+  ]);
+
+  await addTxSignatures({
+    unsignedTx: tx,
+    privateKeys: [hexToBuffer(PRIVATE_KEY)],
+  });
+
+  return pvmapi.issueSignedTx(tx.getSignedTx());
+};
+
+main().then(console.log);