Transaction Examples  [JS Stellar Base]

• Creating an account
• Assets
• Path payment
• Multi-Signature account

Creating an account

In the example below account GCEZWKCA5VLDNRLN3RPRJMRZOX3Z6G5CHCGSNFHEYVXM3XOJMDS674JZ is creating account GASOCNHNNLYFNMDJYQ3XFMI7BYHIOCFW3GJEOWRPEGK2TDPGTG2E5EDW. The source account is giving the new account 25 XLM as its initial balance. Current sequence number of the source account in the ledger is 46316927324160.

StellarSdk.Network.useTestNetwork();
var secretString = 'secret key that corresponds to GCEZWKCA5VLDNRLN3RPRJMRZOX3Z6G5CHCGSNFHEYVXM3XOJMDS674JZ';

// create an Account object using locally tracked sequence number
var an_account = new StellarSdk.Account("GCEZWKCA5VLDNRLN3RPRJMRZOX3Z6G5CHCGSNFHEYVXM3XOJMDS674JZ", "46316927324160");

var transaction = new StellarSdk.TransactionBuilder(an_account)
    .addOperation(StellarSdk.Operation.createAccount({
      destination: "GASOCNHNNLYFNMDJYQ3XFMI7BYHIOCFW3GJEOWRPEGK2TDPGTG2E5EDW",
      startingBalance: "25"  // in XLM
    }))
    .build();

transaction.sign(StellarSdk.Keypair.fromSecret(seedString)); // sign the transaction

// transaction is now ready to be sent to the network or saved somewhere

Assets

Object of the Asset class represents an asset in the Stellar network. Right now there are 3 possible types of assets in the Stellar network:

• native XLM asset (ASSET_TYPE_NATIVE),
• issued assets with asset code of maximum 4 characters (ASSET_TYPE_CREDIT_ALPHANUM4),
• issued assets with asset code of maximum 12 characters (ASSET_TYPE_CREDIT_ALPHANUM12).

To create a new native asset representation use static native() method:

var nativeAsset = StellarSdk.Asset.native();
var isNative = nativeAsset.isNative(); // true

To represent an issued asset you need to create a new object of type Asset with an asset code and issuer:

// Creates TEST asset issued by GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB
var testAsset = new StellarSdk.Asset('TEST', 'GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB');
var isNative = testAsset.isNative(); // false
// Creates Google stock asset issued by GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB
var googleStockAsset = new StellarSdk.Asset('US38259P7069', 'GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB');

Path payment

In the example below we’re sending 1000 XLM (at max) from GABJLI6IVBKJ7HIC5NN7HHDCIEW3CMWQ2DWYHREQQUFWSWZ2CDAMZZX4 to GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB. Destination Asset will be GBP issued by GASOCNHNNLYFNMDJYQ3XFMI7BYHIOCFW3GJEOWRPEGK2TDPGTG2E5EDW. Assets will be exchanged using the following path:

• USD issued by GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB,
• EUR issued by GDTNXRLOJD2YEBPKK7KCMR7J33AAG5VZXHAJTHIG736D6LVEFLLLKPDL.

The path payment will cause the destination address to get 5.5 GBP. It will cost the sender no more than 1000 XLM. In this example there will be 3 exchanges, XLM -> USD, USD-> EUR, EUR->GBP.

StellarSdk.Network.useTestNetwork();
var keypair = StellarSdk.Keypair.fromSecret(secretString);

var source = new StellarSdk.Account(keypair.publicKey(), "46316927324160");
var transaction = new StellarSdk.TransactionBuilder(source)
  .addOperation(StellarSdk.Operation.pathPayment({
      sendAsset: StellarSdk.Asset.native(),
      sendMax: "1000",
      destination: 'GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB',
      destAsset: new StellarSdk.Asset('GBP', 'GASOCNHNNLYFNMDJYQ3XFMI7BYHIOCFW3GJEOWRPEGK2TDPGTG2E5EDW'),
      destAmount: "5.50",
      path: [
        new StellarSdk.Asset('USD', 'GBBM6BKZPEHWYO3E3YKREDPQXMS4VK35YLNU7NFBRI26RAN7GI5POFBB'),
        new StellarSdk.Asset('EUR', 'GDTNXRLOJD2YEBPKK7KCMR7J33AAG5VZXHAJTHIG736D6LVEFLLLKPDL')
      ]
  }))
  .build();

transaction.sign(keypair);

Multi-signature account

Multi-signature accounts can be used to require that transactions require multiple public keys to sign before they are considered valid. This is done by first configuring your account’s “threshold” levels. Each operation has a threshold level of either low, medium, or high. You give each threshold level a number between 1-255 in your account. Then, for each key in your account, you assign it a weight (1-255, setting a 0 weight deletes the key). Any transaction must be signed with enough keys to meet the threshold.

For example, let’s say you set your threshold levels; low = 1, medium = 2, high = 3. You want to send a payment operation, which is a medium threshold operation. Your master key has weight 1. Additionally, you have a secondary key associated with your account which has a weight of 1. Now, the transaction you submit for this payment must include both signatures of your master key and secondary key since their combined weight is 2 which is enough to authorize the payment operation.

In this example, we will:

• Add a second signer to the account
• Set our account’s masterkey weight and threshold levels
• Create a multi signature transaction that sends a payment

In each example, we’ll use the root account.

Set up multisig account

StellarSdk.Network.useTestNetwork();
var rootKeypair = StellarSdk.Keypair.fromSecret("SBQWY3DNPFWGSZTFNV4WQZLBOJ2GQYLTMJSWK3TTMVQXEY3INFXGO52X")
var account = new StellarSdk.Account(rootkeypair.publicKey(), "46316927324160");

var secondaryAddress = "GC6HHHS7SH7KNUAOBKVGT2QZIQLRB5UA7QAGLA3IROWPH4TN65UKNJPK";

var transaction = new StellarSdk.TransactionBuilder(account)
  .addOperation(StellarSdk.Operation.setOptions({
    signer: {
      ed25519PublicKey: secondaryAddress,
      weight: 1
    }
  }))
  .addOperation(StellarSdk.Operation.setOptions({
    masterWeight: 1, // set master key weight
    lowThreshold: 1,
    medThreshold: 2, // a payment is medium threshold
    highThreshold: 2 // make sure to have enough weight to add up to the high threshold!
  }))
  .build();

transaction.sign(rootKeypair); // only need to sign with the root signer as the 2nd signer won't be added to the account till after this transaction completes

// now create a payment with the account that has two signers

var transaction = new StellarSdk.TransactionBuilder(account)
    .addOperation(StellarSdk.Operation.payment({
        destination: "GBTVUCDT5CNSXIHJTDHYSZG3YJFXBAJ6FM4CKS5GKSAWJOLZW6XX7NVC",
        asset: StellarSdk.Asset.native(),
        amount: "2000" // 2000 XLM
    }))
    .build();

var secondKeypair = StellarSdk.Keypair.fromSecret("SAMZUAAPLRUH62HH3XE7NVD6ZSMTWPWGM6DS4X47HLVRHEBKP4U2H5E7");

// now we need to sign the transaction with both the root and the secondaryAddress
transaction.sign(rootKeypair);
transaction.sign(secondKeypair);