Sample cap33 on standalone

cap33.go

package main

import (
	"log"

	"github.com/stellar/go/clients/horizonclient"
	"github.com/stellar/go/keypair"
	"github.com/stellar/go/txnbuild"
)

// var Passphrase = network.TestNetworkPassphrase
var Passphrase = "Standalone Network ; February 2017"

func main() {
	// Make a keypair for a known account from a secret seed
	kp := keypair.Master(Passphrase)
	// kp, _ := keypair.Parse("SC4JDII6OYNXAY3ICRACJXCCOHISSZEP3WQ4TXIL7DXRHGO7ZOTUG735")

	// Get the current state of the account from the network
	client := horizonclient.DefaultTestNetClient
	client.HorizonURL = "https://url.ngrok.io"
	ar := horizonclient.AccountRequest{AccountID: kp.Address()}
	sourceAccount, err := client.AccountDetail(ar)
	if err != nil {
		log.Fatalln(err)
	}

	// Build an operation to create and fund a new account
	// Public Key	GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2
	// Secret Key	SC4JDII6OYNXAY3ICRACJXCCOHISSZEP3WQ4TXIL7DXRHGO7ZOTUG735

	// Public Key	GDP5EHRW3RXYQFMGWM3AXDIO34NHU7VS3DEGZNLQRWAES2FQ23DTNL7Y
	// Secret Key	SAYYG4Y33MR2NEN26L7TAPGWYNYGKCXRZEYCOT76ZDK7K67R5LB6HPKY
	//
	// Public Key	GBE4URUXRVVW2TTOCSJCTAZ3SQNXO24A2QM6XD7E4Y2JL63OP6HNRCNV
	// Secret Key	SBSP6KR3ZBJWH43V2Y4IUKUIBBSHCUCTKYVLDLOWV2IMP6MIRCTUPMGG
	//

	np, _ := keypair.Parse("SC4JDII6OYNXAY3ICRACJXCCOHISSZEP3WQ4TXIL7DXRHGO7ZOTUG735")

	ops := []txnbuild.Operation{
		&txnbuild.BeginSponsoringFutureReserves{
			SponsoredID: "GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
		},
		&txnbuild.CreateAccount{
			Destination: "GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
			Amount:      "0",
		},
		&txnbuild.EndSponsoringFutureReserves{
			SourceAccount: &txnbuild.SimpleAccount{
				AccountID: "GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
			},
		},
		// &txnbuild.BeginSponsoringFutureReserves{
		// 	SponsoredID: "GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
		// },
		// &txnbuild.CreateAccount{
		// 	Destination: "GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
		// 	Amount:      "0",
		// },
		// &txnbuild.EndSponsoringFutureReserves{},
		// &txnbuild.CreateClaimableBalance{
		// 	Destinations: []string{
		// 		"GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
		// 		"GDP5EHRW3RXYQFMGWM3AXDIO34NHU7VS3DEGZNLQRWAES2FQ23DTNL7Y",
		// 	},
		// 	Amount: "20",
		// 	Asset:  txnbuild.NativeAsset{},
		// },
		// &txnbuild.CreateClaimableBalance{
		// 	Destinations: []string{
		// 		"GCFEQ7DVT2DXKFKHGFWHMCSRYMFDGUADPNF7KFPAE3C2P7YUQBMH4DG2",
		// 	},
		// 	Amount: "20",
		// 	Asset:  txnbuild.NativeAsset{},
		// },
		// &txnbuild.ClaimClaimableBalance{
		// 	BalanceID: "AAAAANq8UyS+WzhAw8kYOZzeDNw7AWjGKBUdq8DswgRHPXF2",
		// },
	}

	// Construct the transaction that holds the operations to execute on the network
	tx, err := txnbuild.NewTransaction(
		txnbuild.TransactionParams{
			SourceAccount:        &sourceAccount,
			IncrementSequenceNum: true,
			Operations:           ops,
			BaseFee:              txnbuild.MinBaseFee * 4,
			Timebounds:           txnbuild.NewTimeout(300),
		},
	)
	if err != nil {
		log.Fatalln(err)
	}

	// Sign the transaction
	tx, err = tx.Sign(Passphrase, kp.(*keypair.Full))
	if err != nil {
		log.Fatalln(err)
	}
	tx, err = tx.Sign(Passphrase, np.(*keypair.Full))
	if err != nil {
		log.Fatalln(err)
	}
	// Get the base 64 encoded transaction envelope
	txe, err := tx.Base64()
	if err != nil {
		log.Fatalln(err)
	}

	// fmt.Println(txe)
	// Send the transaction to the network
	_, err = client.SubmitTransactionXDR(txe)
	if err != nil {
		log.Fatalln(err)
	}
}