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Can I use it without converting Steem to Bitcoin?

Just buy Ethereum on Coinbase. It transfers instantly to Eth from Bank account and then you can do a fast transfer to Steem via Blocktrades! 😳🏎🚄

Thats what I meant before. It will be great if we dont need to exchange to any other currency :)

Sure but it's so easy to buy others and the market moves up and down the same so it's not like you lose any by quickly go via another currency!