This document explains how to influence the blockchain’s state by broadcasting transactions.

Transactions include:

  • a list of messages

  • an optional memo

  • a fee

  • a signature from a key

The messages included in a transaction contain the information that will be routed to a proper message handler in the node, which in turn parses the inputs and determines the next state of the blockchain.

Create transactions#

Create a wallet#

You will first want to create a wallet which you can use to sign transactions.

import { MnemonicKey, LCDClient } from '@terra-money/terra.js';

const mk = new MnemonicKey();
const terra = new LCDClient({
  URL: '',
  chainID: 'bombay-12'
const wallet = terra.wallet(mk);

Create messages#

import { MsgSend } from '@terra-money/terra.js';

const send = new MsgSend(
  { uluna: 1000 }

Create and Sign Transaction#

const tx = await wallet.createAndSignTx({
  msgs: [send],
  memo: "Hello"

Broadcast transaction#

const txResult = await terra.tx.broadcast(tx);

The default broadcast mode is block, which waits until the transaction has been included in a block. This will give you the most information about the transaction, including events and errors while processing.

You can also use sync or async broadcast modes.

// const syncTxResult = await terra.tx.broadcastSync(tx);
// const asyncTxResult = await terra.tx.broadcastAsync(tx);

Check events#

If you broadcasted the transaction with block, you can get the events emitted by your transaction.

import { isTxError } from "@terra-money/terra.js";

const txResult = terra.tx.broadcast(tx);

if (isTxError(txResult)) {
  throw new Error(`encountered an error while running the transaction: ${txResult.code} ${txResult.codespace}`);

// check for events from the first message