Can cryptocurrency (staking rewards) be shown as D7 Passive income ?

In theory it should be fine.  As long as there is a sufficient track record and the amount sent is always well above the levels set. I am an EU citizen so I have no D7 experience myself. 

Please be conscious of the potential tax consequences of staking income from crypto in Portugal.  Things are not as clear cut in terms of it being tax free as some people try to assert.  Only crypto capital gains escape taxation.  Anything else is undefined and therefore could be taxed depending on legal interpretations. 

Theoretically, it should work, but I am not sure. You better discuss that with the Portugal authorities. If you have already done it then, please let me know because I am also interested in it.
I want to get a D7 Passive income Visa and know what is accepted and what is not. I have both cryptos and some forex assets on https://fbs.com/trading/platforms/mt4macos . And I was wondering if those two can be somehow accepted to get this Visa because I want to leave the US ASAP. This country’s become too wild for me to live there, and something is definitely wrong there.