@jacobgadikian found a malicious activity on rpc.blurt.world server, so he had take the server down this morning.
While rpc.blurt.world is down for a moment, I changed the default node for blurt.world, blurtwallet.com and blurt.blog to my personal full node https://rpc.blurt.buzz, so sites can still running. Sites are running okay but just a little bit slow.
But some services(blurtworld.com,blurtter.com,whalevault, etc) mainly rely on rpc.blurt.world also experiencing downtime. Instead of asking them to change the default node, I set rpc.blurt.world point to my full node, so this way, no change needed for other services.
In the future, any service has issue with other nodes, welcome to use my full node: https://rpc.blurt.buzz