std::string rpc_url = "https://mango.devnet.rpcpool.com";

auto connection = solana::rpc::Connection(rpc_url);

// 1. fetch recent blockhash to anchor tx to

auto recentBlockHash = connection.getLatestBlockhash();

// 2. assemble tx

const solana::PublicKey feePayer = solana::PublicKey::fromBase58(

"8K4Exjnvs3ZJQDE78zmFoax5Sh4cEVdbk1D1r17Wxuud");

const solana::PublicKey memoProgram =

solana::PublicKey::fromBase58(solana::MEMO_PROGRAM_ID);

const std::string memo = "Hello \xF0\x9F\xA5\xAD";

const solana::CompiledInstruction ix = {

1, {}, std::vector<uint8_t>(memo.begin(), memo.end())};

const solana::CompiledTransaction tx = {

recentBlockHash, {feePayer, memoProgram}, {ix}, 1, 0, 1};

// 3. send & sign tx

const auto keypair =

solana::Keypair::fromFile("../tests/fixtures/solana/id.json");

const auto b58Sig = connection.sendTransaction(keypair, tx);

spdlog::info(

"sent tx. check: https://explorer.solana.com/tx/{}?cluster=devnet",

b58Sig);

// 4. wait for tx to confirm

const auto timeoutBlockHeight =

recentBlockHash.lastValidBlockHeight

mango_v3::MAXIMUM_NUMBER_OF_BLOCKS_FOR_TRANSACTION;

bool confirmed = false;

confirmed =

connection.confirmTransaction(b58Sig, solana::Commitment::FINALIZED, 140);

if (confirmed) return EXIT_SUCCESS;

return EXIT_FAILURE;