The address 39znAZoRfKgtm2fs4fpdGYix655GYhfBus and the other two addresses all belong to CoinPayments.com. I am guessing the other two addresses are deposit addresses.
The
above is not proof they are the same person
It's not even just the address, but the fact that
8 transactions occurred in one day
(2019-04-20) for
2 hours.
Coincidences happen of course, but it's too much of a coincidence.
That address have 100 BTC, I doubt sig spammer can have 100 BTC in their balance. QuickSeller is correct here although I too think they are alt.