Andrew Chow, Bitcoin Core developer at Blockstream joins me in this episode to talk about his work on HWI - Hardware Wallet Interface and PSBT - Partially Signed Bitcoin Transactions. We discuss the benefits of PSBT and Hardware Wallet Interface in making Bitcoin’s user interface better for users who want to do multi sig or interact with hardware wallets using Bitcoin Core.  We talk: Andrew’s background Why PSBT (Partially Signed Bitcoin Transactions) is needed HWI - Hardware Wallet Interface Output descriptors Derivation paths Use of PSBT for CoinJoining and Multi-Sig Where HWI is going from here Andrew Chow Links and other links discussed in episode: Andrew Chow Twitter: https://twitter.com/achow101  Andrew’s Stack Exchange account: https://bitcoin.stackexchange.com/users/48884/andrew-chow  Andrew Chow Twitch: https://www.twitch.tv/achow101  Bitcoin-Core HWI github link: https://github.com/bitcoin-core/HWI  PSBT: https://github.com/bitcoin/bitcoin/blob/master/doc/psbt.md  Stack Exchange - Pieter Wuille answer on output descriptors: https://bitcoin.stackexchange.com/a/89281  Output descriptors link: https://github.com/bitcoin/bitcoin/blob/master/doc/descriptors.md  Sponsor links: Kraken: http://www.kraken.com/?utm_source=podcast&utm_medium=stephanlivera  Unchained Capital: https://www.unchained-capital.com/?utm_source=Stephan%20Livera&utm_medium=Referral&utm_campaign=Affiliate  Manning Publications (code: LIVERA for 40% off): http://mng.bz/07rW Stephan Livera links: Follow me on twitter: https://twitter.com/stephanlivera  Show notes and website: https://stephanlivera.com/  Subscribe to the podcast: https://anchor.fm/stephan-livera/  Rate and Review the podcast: https://itunes.apple.com/podcast/stephan-livera-podcast/id1415720320?mt=2  Orange Coin Good and other Merchandise @ Layer One BTC Store: https://layeronebtc.com/collections/stephan-livera-podcast  Email contact: stephanlivera@pm.me