Zk-snarks is one of the best open source privacy solutions out there. It allows for untraceable transactions by encrypting the data.
There are many coins that have adopted Zk-snarks from Zcash, coins like Ethereum, Zencash, Hush, and Zclassic. When Droplet moves out of the token stage and over to its own blockchain, we will implement Zk-snarks to make Droplet private.
Our team is currently working on numerous features & innovations. Zk-snarks are one of three important features we will be adding to Droplet by 2018.