DEFINITION
Bitcoin- or altcoin mining is the process by which transactions are verified and added to the public ledger, known as the block chain, and also the means through which new bitcoin or altcoin are released. Anyone with access to the internet and suitable hardware can participate in mining.
There are various ways mining are taking place for example via cpu gpu or cloud
DOGECOIN
https://doge.allminer.online/index.php?refer=18660
https://doubledogecoin.com/index.php?refer=23141
LITECOIN
https://ltc.allminer.online/index.php?refer=8377