Wanted to give you another resource to get some info on Spark. Instead of issuing a separate BTC-based coin, the whole system is built on pre-signed exit transactions that get updated for every Spark transaction. This allows users to unilaterally exit from the base chain at any time. I know you consume a lot of content though, so no worries if you can’t get to it, but I do truly believe this might be one of the best scaling solutions that stays true to the Bitcoin ethos.
https://fountain.fm/episode/6XPKBxI5LGT17oqww3mN
https://fountain.fm/episode/IwvVdS7vgLUWLRVBxT9Y
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