Added REST api and cleaned up service unit file.
[Unit]
Description=bitcoind
After=network.target
[Service]
ExecStart=/usr/local/bin/bitcoind
User={{bitcoind_user}}
PrivateTmp=true
ProtectSystem=full
NoNewPrivileges=true
PrivateDevices=true
MemoryDenyWriteExecute=true
[Install]
WantedBy=multi-user.target