How to use a hardware wallet directly with Bitcoin Core: https://youtu.be/SUDkYbkcTsQ
Slides (with source in Markdown): https://github.com/Sjors/presentations/blob/master/2018-09-19%20London%20Bitcoin%20Devs/2018-09%20London%20Bitcoin%20Devs%200.5.pdf
I gave an updated presentation at Advancing Bitcoin last month: https://vimeo.com/316634495
HWI (works with Bitcoin Core 0.18.0 which is still pending release): https://github.com/bitcoin-core/HWI
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