DigiByte is a public decentralized blockchain. To use DGB cryptocurrency, you do not need to provide personal data, the coin has no limits when transferring, there are also no maximum and minimum values.

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Great questions! 

Since we are SaaS-type of a platform, we count the number of requests our users do.
We can't say that 137 million requests are from 137 million users, because one transaction, f.e., takes way more than 1 RPC request.

So do you have unique count numbers.