You can manually verify if it is a SentiBot crawler.
Run a reverse DNS lookup on the accessing IP address from your logs, using the host command.
Verify that the domain name is *.sentione.com
Run a forward DNS lookup on the domain name retrieved in step 1 using the host command on the retrieved domain name.
Verify that it's the same as the original accessing IP address from your logs.
Example 1:
host 95.217.144.241
241.144.217.95.in-addr.arpa domain name pointer prod-w6.sentione.com.
host prod-w6.sentione.com
prod-w6.sentione.com has address 95.217.144.241