If you have a SentinelX detected while you're using the COIN App, you can earn 12x the rewards!
You only need one SentinelX nearby to earn 12X the rewards. Having more than one SentinelX won't multiply the rewards. The COIN App will only connect to one SentinelX at a time!
Keep this in mind when using features such as Sentinel Sharing. You can learn more about Sentinel Sharing here: What is Sentinel Sharing?