Pre order November for Antminer D3 with PSU for sale in Australia.
Will touch down to me late Nov/early Dec, and then I can post to you in Australia or local pick up Central Coast NSW. 3300 AUD inc APW3+++ power supply. If BTC price starts rising again after the current drop then these will...
His ID or your ID? It could be a fake ID if it was his. If it was a real transaction someone still might not go through with it once they have BTC because they realise there is little recourse the buyer has if they don't post it.
I can't believe someone would send a stranger BTC over the internet. Most of these d3 for sale threads are obvious scams. I don't think you will be getting your BTC back bud.
For the last batch I read there was 30,000. I'm not sure about the earlier ones - maybe around 15,000. The hash rate has gone up 5 fold since June, and the difficulty has doubled in the past month, and it could be expected to continue.
The yearly profit is down to 27k per year per mining...