Substratum is currently based on cryptocurrency Ethereum protocol.
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NXT is one of the early cryptocurrencies and was started in 2013. As the Jelurida project’s website states, it was the “first to rely entirely on the PoS protocol”. It is currently listed by the number of exchanges.
Ubiq (UBQ) is the mineable coin supported by the number of exchanges. Running the “Ethereum Virtual machine”, Ubiq provides developers with the tools to create smart contracts.