Do some Blog Posting - Repost - open to bidding

I am seeking blog writers with experience in creating SEO optimized blog posts, size 400-600 words, with specific knowledge in Bitcoin industry (especially topic of buying/selling bitcoins / BTC exchanges). All content must be completely original and will check through copyscape. Please describe your approach to SEO optimization specific to this industry/topic. We will provide the main topics as well as some information about those topics. You will be responsible for coming up with the exact post ideas, research and content. I will pay $3-$5 per blog post. For now I am looking for 1-5 blog posts per language, but if all works fine I could be looking for on-going deals. For non-english posts I would prefer native speakers.