CoinMarket requires 100 confirmations for PRT deposits. It's annoying, but they had some kind of reasoning for it...

Reason was low net hashrate. Major problem for any coin. That means that nobody ismining it anymore due to either high difficulty, or too low block reward, or low prt prices on exchanges, or all together.

once we raise the hashrate, confirmation amounts will be decreased. at the moment we are facing the threat of being removed from some exchanges only due to the low hashrate.