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That's exactly what I think is happening now with the introduction of Bakkt. They already secured a position in BTC with a reasonable stake, bought in futures contracts at let's say 10k for end of this month

Sold their Bitcoin holdings and as the downward trend continues as other investors want to get out, they know sell their futures at the expiration date and make a profit. Then they can use this to buy back BTC and continue the cycle

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