We are SparkPool, the second biggest Ethereum mining pool in the world. We have been supporting Beam successfully and now our Grin pool will launch at the same time as Grin’s main net launch. Now we supply test for Grin mining, you can connect to our node to mine Grin. Test server: grin.sparkpool.com:6666 .You can visit our website to check your mining income.Here is the introduction of Mining Grin in SparkPool.https://support.sparkpool.com/hc/en-us/articles/360014895133-Introduction-of-mining-Grin