Send transactions on the public layer

Basic usage

import LTO, { Binary } from '@ltonetwork/lto';
enum STATEMENT { VERIFIED=0x3500 };

lto = new LTO('T');
const account = lto.account();

const recipient = '3N2XoMuukk4BPiLn95vDkv4ocU5szMXuxVN';

lto.transfer(account, recipient, 100_00000000);
lto.massTransfer(account, [{recipient: recipient1, amount: 100_00000000}, {recipient: recipient2, amount: 50_00000000}]);

lto.anchor(account, new Binary('some value').hash(), new Binary('other value').hash());
  { key: new Binary('some key').hash(), value: new Binary('some value').hash() },
  { key: new Binary('other key').hash(), value: new Binary('other value').hash() },

lto.associate(account, RELATIONSHIP.MEMBER_OF, recipient);
lto.revokeAssociation(account, RELATIONSHIP.MEMBER_OF, recipient);, recipient, 10000_00000000);
lto.cancelLease(account, '9V7tdKEEJiH86eCPNxPg1vxhmp8oNH6Mqtf1fQeSeS4U');

lto.sponsor(account, recipient);
lto.cancelSponsorship(account, recipient);

lto.makeStatement(account, STATEMENT.VERIFIED, recipient);

lto.setData(account, {foo: 'bar'});

Amounts are in LTO * 10^8. Eg: 12.46 LTO is1246000000, which may be written as 12_46000000 in JavaScript.

Executing Transactions

The LTO class provides a simple way for doing transactions. Alternatively, you can create a transaction object, sign it, and broadcast it.

Create transaction

import { Transfer } from '@ltonetwork/lto/transactions';

const transaction = new Transfer(recipient, amount);

Sign transaction

The Transaction needs then to be signed. In order to sign a transaction an account is needed.


Broadcasting transaction

For last the transaction needs to be broadcasted to the node. In order to do so we need to connect to the node using the PublicNode class.

const broadcastedTx = await lto.node.broadcast(transaction);

Fluent interface

Transaction classes have convenience methods, providing a fluent interface

import { Transfer } from '@ltonetwork/lto/transactions';

const tx = await new Transfer(recipient, amount)

Sponsoring transactions

A second account can offer to pay for the transaction fees by co-signing the transaction.

import { Anchor } from '@ltonetwork/lto/transactions';

const tx = await new Anchor(new Binary('foo').hash())

Alternatively, you can set the parent property of an account to automatically have the parent sponsor all transactions of the child.

Transaction types

Transfer transaction

import { Transfer } from '@ltonetwork/lto/transactions';

const tx = new Transfer(recipient, amount, new Binary('attachment'))

Mass Transfer transaction

import { MassTransfer } from '@ltonetwork/lto/transactions';

const tx = new MassTransfer(
    {recipient: recipient1, amount: amount1},
    {recipient: recipient2, amount: amount2}
  new Binary('attachment'),

Anchor transaction

import { Anchor } from '@ltonetwork/lto/transactions';

const hash1 = new Binary('hello').hash();
const hash2 = Binary.fromHex('e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855');

const tx = new Anchor(hash1, hash2, ...);

Mapped Anchor transaction

import { MappedAnchor } from '@ltonetwork/lto/transactions';

const hashKey = new Binary('key').hash();
const hashValue = new Binary('value').hash();

const tx = new MappedAnchor({ key: hashKey, value: hashValue }, ...);

Lease transaction

import { Lease } from '@ltonetwork/lto/transactions';

const tx = new Lease(recipient, amount);

Cancel Lease transaction

import { CancelLease } from '@ltonetwork/lto/transactions';

const tx = new CancelLease(leaseId);

SetScript transaction

Create a SetScript transaction using the compile method of the public node.

const tx = lto.node.compile(script);

Clear a script by using null as compiled script.

import { SetScript } from '@ltonetwork/lto/transactions';

const tx = new SetScript(null);

Sponsorship transaction

import { SetScript } from '@ltonetwork/lto/transactions';

const tx = new Sponsorship(recipient);

Cancel Sponsorship transaction

import { CancelSponsorship } from '@ltonetwork/lto/transactions';

const tx = new CancelSponsorship(recipient);

Association transaction

import { Association } from '@ltonetwork/lto/transactions';

const tx = new Association(
  new Binary('subject'),

Revoke Association transaction

import { RevokeAssociation } from '@ltonetwork/lto/transactions';

const tx = new RevokeAssociation(association_type, recipient, new Binary('subject'));

Statement transaction

import { Statement } from '@ltonetwork/lto/transactions';

const tx = new Statement(
  new Binary('subject'),

Data transaction

import { Data } from '@ltonetwork/lto/transactions';

const tx = new Data({
  num: 100,
  str: 'some string',
  bin: new Binary('Hello').hash(),
  bool: true,

Public Node

By default, the following public nodes are used

  • Mainnet -

  • Testnet -

To use your own public node, set the node address of the LTO object.

lto.nodeAddress = "http://localhost:6869";

The lto.node object will automatically be replaced when the node address is changed.

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