Setting a different PoW algorithm in a clonecoin is no different to setting the block-time or money supply or reward, or any of the other variables which define a coin. It is just a section of the coin-code where you set these particular attributes.

It does NOT require ANY innovative or unique coding, that is why there are so many clonecoins with different variables which are all based on the same coin-code. As I said, given that Signatum is a PoW/PoS codebase and has a leading 'B' for its address, I'm going with it being a clone of 'Blackoin'.

Speaking of 'unique tech', I have taken a quick look at the Signatum website where they make this rather bold claim towards their 'technology':

Except, of course, the marketplace isn't their technology at all. As I said, it is merely a copy-paste of a basic UI you can download and skin yourself:

Stick your logo in the section marked and off you go.

As I said, the 'dev team' isn't developing anything, they are just fobbing you off on cheap copy-pasta wallets and web 'services'.