Estas son las mejores minerias de criptomonedas de forma gratuita en la nube el registro en gratis en algunas hay que invertir para retirar 
https://www.eobot.com/user/1554556
http://www.minerfarm.com/login?r=4617#toregister
https://nice-miner.com/?referrer=zEGSwcQjxbZk litecoin ojo esta
https://www.hashter.io/?ref=118166
https://www.hashtion.io/?r=317256
https://bits2u.com/es/index.html?ref=81713
https://dayrex.cc/?ref=isaias19
https://www.cryptominingfarm.io/signup/?referrer=5A445437DAFB8
https://auto-mining.online/?ref=23191
https://dualmine.com/?ref=14640
http://www.absolutmining.com/?ref=E9C0BDA
https://forkmine.com/?ref=5934281478
https://cashmine.pro/?ref=3984667195
https://genmine.pro/?ref=5676148233
https://minezone.io/index.php?reffid=rZ2ppJ6W
https://www.supermining.website/?referral=204553
https://bentalefin.com/?ref=59502
https://best-mining.org/?ref=6876
https://www.nexusmine.net/?ref=43062