Gav

I have cashed out of my latest gamble in bitcoin and bought 9 x 2017 silver Britannia from Bitgild. 1 of them was the 20 year anniversary coin which I paid for using the bitcoin my PC has mined over the past month. Add on the electricity bill for that one and we are looking at some expensive silver, but its a novelty thing I guess. 

Hey KDave, I have been very interested about bitcoin and crypto currencies, I'm curious how many kWh did it take to mine a bitcoin?

Just an estimation or a rough guess, no need to calculate the exact number just a ball park figure would be useful.

Anyone maybe has a fix for the toning on the edges? Would be much appreciated... 

Here goes but a warning this can cause scratches.

I remove milk spots with a bit of toothpaste and gentle rubbing under dripping water. Anything more than gentle rubbing would leave scratches. I wouldn't recommend this for any proof coin, perfect for bullion coins that don't have a frosted or matt finish.

I have tried to get milk spots out of some of my Perth mint sharks and kangaroos but the spots don't clean off well if they on a matt finish.

Canadian maple coins older than 2014 clean very well with this technique.

It can leave tiny scratches that can be seen under a loop with good lighting but it removes those milk spots so I guess making a big problem a smaller problem.

Not sure if it will help John chiwoo wang.