Transactions

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 that you can use to sign transactions.

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

const mk = new MnemonicKey();

const terra = new LCDClient({

URL: 'https://pisco-lcd.terra.dev',

chainID: 'pisco-1',

});

const wallet = terra.wallet(mk);

Create messages

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

const send = new MsgSend(

wallet.key.accAddress('terra'),

'<random-terra-address>',

{

uluna: 1000,

},

);

Create and Sign Transaction

const tx = await wallet.createAndSignTx({

msgs: [send],

memo: 'Hello',

chainID: 'pisco-1',

});

Broadcast transaction

const txResult = await terra.tx.broadcast(tx, 'pisco-1');

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, 'pisco-1');

// const asyncTxResult = await terra.tx.broadcastAsync(tx, 'pisco-1');

Check events

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

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

const txResult = terra.tx.broadcast(tx, 'pisco-1');

if (isTxError(txResult)) {

throw new Error(

`encountered an error while running the transaction: ${txResult.code} ${txResult.codespace}`,

);

}

// check for events from the first message

txResult.logs[0].eventsByType.store_code;