I want to explain how witdrawal steem to bitcoin , follow tutorial and steps following :

1. You can create an account https://blocktrades.us/ 
2. Creating an account there and select convert Steem to Bitcoin or Steem Dollar for bitcoin.
3. https://s31.postimg.org/duo1qe3wr/WD_blocktrade.png fill out how many would you send for example 30 steem.
4. https://s31.postimg.org/x3f5gp4h7/wdblocktrade1.png you will get information where would you send or steem steem your dollar , fill in your username and memos have been given.
5. https://s31.postimg.org/5q18dmxgb/wdblocktrade2.png fill in what numbers and username, as well as the memo.

 Steem should arrive in your steemit wallet after approximatly 3 min