Swap UTXOs off-chain with minimal trust in a federation (permissionless peg-out).
How to perform an atomic swap in merely two (or three) transactions, instead of four.
How to build an SPV client that comes to consensus even if 51% of miners is malicious.
An auction-based method of mining blocks of other chains by paying BTC miners in bitcoin.
How to introduce a new token without speculation, enabling sidechains that don't store value.
I'm also co-host of the Unhashed Podcast