Bitcoin Q&A: Node compatibility, Lightning, and incentives

What is the difference between reachable vs. non-reachable nodes? Will there be incentive schemes to run nodes? Are nodes that use older versions of the Bitcoin Core software backwards-compatible? What are the differences between Bitcoin and Lightning nodes and wallets?

These questions are from the MOOC 10.5 session and the December monthly subscriber session, which took place on October 5th and December 15th 2018 respectively. If you want early-access to talks and a chance to participate in the monthly live Q&As with Andreas, become a patron: https://www.patreon.com/aantonop

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This audio content, description, and imagery has been extracted from the original YouTube video https://youtu.be/x1on0sdTU4M and is licensed under Creative Commons [CC BY http://bit.ly/yt-cc-by]. Credit to Andreas M. Antonopoulos https://twitter.com/aantonop