Devs updates the code daily , before say something check the github offical code please
https://github.com/futuro-coin/Futuro last updates 8h ago, and update regarding the masterdnode.
Double spend - is immpossible check the source code !
MASTERNODE CANNOT CONFIRMED THE TRANSACTIONS - ONLY MINERS BY MINING A BLOCKS
MASTERNODES NOT MINING - ONLY POWER
Decentralize - yes , everyone can mine the coin by themselves and code is opensource - However the masternodes own by the company so far, however I belive coins goes for cloud mining too. Masternodes are centralized - this is fact and Im unhappy with that too.
For example Ripple is much more centralize and is top 5 coin available in the market.
I belive this solution is not so bad for future of the coin, company can generate the profit so they can have more money to implement and paid for marketing.
there is many decentralized coins and 90% went died.
Here with have more guarantee that company do everything they can to make this coin popular and best of best.
Just my think about.