[carbeewo]

There are some cryptocurrencies which are actually technologically novel. Unfortunately, they don't usually do a great job of marketing themselves, since their teams are more interested in building the technology than in making big bucks from ICOs or speculators.

For example, there is Monero and other "privacy" coins, which promise private and untraceable transactions. They are usually based on ring signatures.

Or IOTA which promises to scale to thousands of transactions per second, and is based on a Directed Acyclic Graph instead of a blockchain. The more devices or people who use it to make transactions, the faster it gets. Scalability is something Bitcoin is struggling with right now.

[antocv]

Byteball is an actual working block-chain less cryptocurrency, without a trusted single coordinator as iota has, and has no proof-of-work.

https://byteball.org