Please read article at
http://www.nxtcoinmagazine.com/try-the-silky-smooth-nxt-asset-exchange-today/Mastercoin hasn't done anything to address the "Transaction Malleability issue" besides mandating long confirmation wait times and manually checked withdrawals.
This is the REAL news right here, courtesy of Come-from-Beyond;
Quote from: allwelder on March 10, 2014, 06:34:58 AM
so,what the difference or relation between guid and TXID?
Quote from: Come-from-Beyond on March 09, 2014, 10:12:16 PM
I pushed code that supports GUIDs. When Jean-Luc puts it into the production
exchanges will be able to use guids to track transactions without worrying about transaction malleability. NIP #1 is not ready yet so I created the solution as I felt it should be.
Bolded for emphasis. GUID is guaranteed. TXID subject to transaction malleability.