Thanks Damian- this is the reply I received from Reblaze:
1- you should see all traffic coming from these two source ip:
52.3.61.117
52.5.80.209
these servers located at Amazon us-east north Virginia
2 – we sending the “X-Real-IP” Header that contains the real source ip of the clients
also we sending Geo information Headers :
RBZ-GEO-Country
RBZ-GEO-City
RBZ-GEO-Long
RBZ-GEO-Lat
RBZ-ORG
RBZ-REGION