By Jack Mendel A US prosecutor has told jurors that FTX founder Sam Bankman-Fried was on top of the world a year ago before his historic fraud was exposed, leaving customers and investors without at least 10 billion dollars (£8.23bn) they thought was secure. Assistant US attorney Nathan Rehn repeatedly pointed at Bankman-Fried, sitting with his lawyers in a suit, and accused him of “committing a massive fraud”. He said Bankman-Fried told lies to his investors while he spent their money on himself, his friends and family, buying lavish homes and beachfront property in the Bahamas, spending mill…