Note on privacy: when you validate transactions with your private viewkey, your viewkey is sent to (but not stored on) xmrchain.net over HTTPS. This could potentially allow an attacker to see your incoming, but not outgoing, transactions if they were to get his hands on your viewkey. Even if this were to happen, your funds would still be safe and it would be impossible for somebody to steal your money. For maximum privacy use your own monero-wallet-rpc instance. After downloading (or compiling) the Monero binaries on your server, install the systemd unit files or run monerod and monero-wallet-rpc with screen or tmux. You can skip running monerod by using a remote node with monero-wallet-rpc by adding --daemon-address node.moneroworld.com:18089 to the monero-wallet-rpc.service file.