I don't know how it works with mining specifically, but in general: grin payments require a three-way process. This can be done automatically through an IP address or keybase, or you can do it manually like this:
1. The sender runs grin wallet send -m file -d FILE.txt GRIN_AMOUNT, which creates the file FILE.txt.
2. The sender gives FILE.txt to the recipient.
3. The recipient runs grin wallet receive -i FILE.txt, which creates another file FILE.txt.response.
4. The recipient gives FILE.txt.response to the sender.
5. The sender runs grin wallet finalize -i FILE.txt.response, and the transaction is done.
The IP/keybase methods do these same steps, just automatically.
I'm not going to be mining, but I would like to buy some grin ASAP on the first day. If anyone here is lucky enough to quickly mine some, I'll pay $13/grin (in BTC), but only for the first few grin I buy. PM me.
A few hours after the official launch of the mainnet and the first Grin there are already 10 exchanges that have announced to immediately quote the new coin:
www.bitforex.com
www.bitmesh.com
www.galeon.exchange
www.grinpay.org
www.chainrift.com
www.hb.top
www.nexex.io
www.vinex.network
www.kkex.vip
www.bisq.network
I'm curious to see how much Hash will immediately have Grincoin, or in the first 24-48 hours, how much hash will move / lose Beam in favor of Grin, but above all I'm curious to see if tomorrow with the fork of Constantinople of Ethereum you will have a mining escape to more profitable coin (see Grin) ?!
In my opinion, the next 24-48 hours will be very interesting for the market, and for different subjects (miner and speculators)!