BITMEX:XBTUSD   Bitcoin / US Dollar Perpetual Inverse Swap Contract
Key levels to look for in shorting bitcoin:
5900
5430
4420
2980

You can short bitcoin here and save 10% on fees:

https://www.bitmex.com/register/J7MJjX

Start with low leverage (less than 3x). Small position sizes (each trade should be no more than 2% of your total account size).
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