What happened to FTX and could the crisis spill over to the rest of crypto?

International exchange for crypto assets is in effect unregulated - and may have been built on sand

• Cryptocurrency exchange FTX now worthless, says key investor

FTX, the world's second largest cryptocurrency exchange, is in a crisis and has pitched the digital asset market into another crash.

Here we look at what has happened to FTX, why, and what it means for the wider market.