Are there any environmental friendly cryptos? Bitcoin is destroying so many resources
Long time ago there was Primecoin which used some algorithm to find prime numbers. Why are they so important is simply explaind here:
https://stackoverflow.com/questions/439870/why-are-primes-important-in-cryptographyIt looks like that the idea to both secure currency and do something more usefull while mining has not developed. I mined some of them at the very begininng of the project, but it did not make me millionaire - Primecoin is now nearly dead
