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Re:Ask HN: How do we know Bitcoin is not in a bubble? by mancerayder on Wednesday December 06, 2017 @01:43PM (#15863687)
Here's an idea. Ethereum smart contracts to short bitcoin. You borrow my BTC for 30 days, with a 5% fee. Someone could make a killing off of that idea.
Re:Ask HN: How do we know Bitcoin is not in a bubble? by chrdlu on Wednesday December 06, 2017 @04:10PM (#15865046)
https://medium.com/dydxderivatives/introducing-dydx-2d0f0f32...

Note: I'm not affiliated with that project, but I did see them present yesterday at Token Summit and it looked very interesting!

Re:Ask HN: How do we know Bitcoin is not in a bubble? by colecut on Wednesday December 06, 2017 @01:56PM (#15863819)
This is more of a general purpose app, but would work.

https://gofreakingdoit.com/